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Preferences
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org.osgi.service.prefs</FONT>
<BR>
Interface Preferences</H2>
<HR>
<DL>
<DT><PRE>public interface <B>Preferences</B></DL>
</PRE>
<P>
A node in a hierarchical collection of preference data.
<p>
This interface allows applications to store and retrieve user and system
preference data. This data is stored persistently in an
implementation-dependent backing store. Typical implementations include flat
files, OS-specific registries, directory servers and SQL databases.
<p>
For each bundle, there is a separate tree of nodes for each user, and one for
system preferences. The precise description of "user" and "system" will vary
from one bundle to another. Typical information stored in the user preference
tree might include font choice, and color choice for a bundle which interacts
with the user via a servlet. Typical information stored in the system
preference tree might include installation data, or things like high score
information for a game program.
<p>
Nodes in a preference tree are named in a similar fashion to directories in a
hierarchical file system. Every node in a preference tree has a <i>node name
</i> (which is not necessarily unique), a unique <i>absolute path name </i>,
and a path name <i>relative </i> to each ancestor including itself.
<p>
The root node has a node name of the empty <code>String</code> object ("").
Every other node has an arbitrary node name, specified at the time it is
created. The only restrictions on this name are that it cannot be the empty
string, and it cannot contain the slash character ('/').
<p>
The root node has an absolute path name of <code>"/"</code>. Children of the
root node have absolute path names of <code>"/" + </code> <i><node name>
</i>. All other nodes have absolute path names of <i><parent's absolute
path name> </i> <code>+ "/" + </code> <i><node name> </i>. Note that
all absolute path names begin with the slash character.
<p>
A node <i>n </i>'s path name relative to its ancestor <i>a </i> is simply the
string that must be appended to <i>a </i>'s absolute path name in order to
form <i>n </i>'s absolute path name, with the initial slash character (if
present) removed. Note that:
<ul>
<li>No relative path names begin with the slash character.
<li>Every node's path name relative to itself is the empty string.
<li>Every node's path name relative to its parent is its node name (except
for the root node, which does not have a parent).
<li>Every node's path name relative to the root is its absolute path name
with the initial slash character removed.
</ul>
<p>
Note finally that:
<ul>
<li>No path name contains multiple consecutive slash characters.
<li>No path name with the exception of the root's absolute path name end in
the slash character.
<li>Any string that conforms to these two rules is a valid path name.
</ul>
<p>
Each <code>Preference</code> node has zero or more properties associated with
it, where a property consists of a name and a value. The bundle writer is
free to choose any appropriate names for properties. Their values can be of
type <code>String</code>,<code>long</code>,<code>int</code>,<code>boolean</code>,
<code>byte[]</code>,<code>float</code>, or <code>double</code> but they can
always be accessed as if they were <code>String</code> objects.
<p>
All node name and property name comparisons are case-sensitive.
<p>
All of the methods that modify preference data are permitted to operate
asynchronously; they may return immediately, and changes will eventually
propagate to the persistent backing store, with an implementation-dependent
delay. The <code>flush</code> method may be used to synchronously force updates
to the backing store.
<p>
Implementations must automatically attempt to flush to the backing store any
pending updates for a bundle's preferences when the bundle is stopped or
otherwise ungets the Preferences Service.
<p>
The methods in this class may be invoked concurrently by multiple threads in
a single Java Virtual Machine (JVM) without the need for external
synchronization, and the results will be equivalent to some serial execution.
If this class is used concurrently <i>by multiple JVMs </i> that store their
preference data in the same backing store, the data store will not be
corrupted, but no other guarantees are made concerning the consistency of the
preference data.
<P>
<P>
<HR>
<P>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#absolutePath()">absolutePath</A></B>()</CODE>
<BR>
Returns this node's absolute path name.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#childrenNames()">childrenNames</A></B>()</CODE>
<BR>
Returns the names of the children of this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#clear()">clear</A></B>()</CODE>
<BR>
Removes all of the properties (key-value associations) in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#flush()">flush</A></B>()</CODE>
<BR>
Forces any changes in the contents of this node and its descendants to
the persistent store.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#get(java.lang.String, java.lang.String)">get</A></B>(java.lang.String key,
java.lang.String def)</CODE>
<BR>
Returns the value associated with the specified <code>key</code> in this
node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getBoolean(java.lang.String, boolean)">getBoolean</A></B>(java.lang.String key,
boolean def)</CODE>
<BR>
Returns the <code>boolean</code> value represented by the <code>String</code>
object associated with the specified <code>key</code> in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getByteArray(java.lang.String, byte[])">getByteArray</A></B>(java.lang.String key,
byte[] def)</CODE>
<BR>
Returns the <code>byte[]</code> value represented by the <code>String</code> object
associated with the specified <code>key</code> in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> double</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getDouble(java.lang.String, double)">getDouble</A></B>(java.lang.String key,
double def)</CODE>
<BR>
Returns the <code>double</code> value represented by the <code>String</code>
object associated with the specified <code>key</code> in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> float</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getFloat(java.lang.String, float)">getFloat</A></B>(java.lang.String key,
float def)</CODE>
<BR>
Returns the float <code>value</code> represented by the <code>String</code> object
associated with the specified <code>key</code> in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getInt(java.lang.String, int)">getInt</A></B>(java.lang.String key,
int def)</CODE>
<BR>
Returns the <code>int</code> value represented by the <code>String</code> object
associated with the specified <code>key</code> in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getLong(java.lang.String, long)">getLong</A></B>(java.lang.String key,
long def)</CODE>
<BR>
Returns the <code>long</code> value represented by the <code>String</code> object
associated with the specified <code>key</code> in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#keys()">keys</A></B>()</CODE>
<BR>
Returns all of the keys that have an associated value in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#name()">name</A></B>()</CODE>
<BR>
Returns this node's name, relative to its parent.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../org/osgi/service/prefs/Preferences.html" title="interface in org.osgi.service.prefs">Preferences</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#node(java.lang.String)">node</A></B>(java.lang.String pathName)</CODE>
<BR>
Returns a named <code>Preferences</code> object (node), creating it and any
of its ancestors if they do not already exist.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#nodeExists(java.lang.String)">nodeExists</A></B>(java.lang.String pathName)</CODE>
<BR>
Returns true if the named node exists.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../org/osgi/service/prefs/Preferences.html" title="interface in org.osgi.service.prefs">Preferences</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#parent()">parent</A></B>()</CODE>
<BR>
Returns the parent of this node, or <code>null</code> if this is the root.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#put(java.lang.String, java.lang.String)">put</A></B>(java.lang.String key,
java.lang.String value)</CODE>
<BR>
Associates the specified value with the specified key in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#putBoolean(java.lang.String, boolean)">putBoolean</A></B>(java.lang.String key,
boolean value)</CODE>
<BR>
Associates a <code>String</code> object representing the specified
<code>boolean</code> value with the specified key in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#putByteArray(java.lang.String, byte[])">putByteArray</A></B>(java.lang.String key,
byte[] value)</CODE>
<BR>
Associates a <code>String</code> object representing the specified
<code>byte[]</code> with the specified <code>key</code> in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#putDouble(java.lang.String, double)">putDouble</A></B>(java.lang.String key,
double value)</CODE>
<BR>
Associates a <code>String</code> object representing the specified
<code>double</code> value with the specified <code>key</code> in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#putFloat(java.lang.String, float)">putFloat</A></B>(java.lang.String key,
float value)</CODE>
<BR>
Associates a <code>String</code> object representing the specified
<code>float</code> value with the specified <code>key</code> in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#putInt(java.lang.String, int)">putInt</A></B>(java.lang.String key,
int value)</CODE>
<BR>
Associates a <code>String</code> object representing the specified <code>int</code>
value with the specified <code>key</code> in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#putLong(java.lang.String, long)">putLong</A></B>(java.lang.String key,
long value)</CODE>
<BR>
Associates a <code>String</code> object representing the specified
<code>long</code> value with the specified <code>key</code> in this node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#remove(java.lang.String)">remove</A></B>(java.lang.String key)</CODE>
<BR>
Removes the value associated with the specified <code>key</code> in this
node, if any.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()">removeNode</A></B>()</CODE>
<BR>
Removes this node and all of its descendants, invalidating any properties
contained in the removed nodes.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/prefs/Preferences.html#sync()">sync</A></B>()</CODE>
<BR>
Ensures that future reads from this node and its descendants reflect any
changes that were committed to the persistent store (from any VM) prior
to the <code>sync</code> invocation.</TD>
</TR>
</TABLE>
<P>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="put(java.lang.String, java.lang.String)"><!-- --></A><H3>
put</H3>
<PRE>
void <B>put</B>(java.lang.String key,
java.lang.String value)</PRE>
<DL>
<DD>Associates the specified value with the specified key in this node.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key with which the specified value is to be associated.<DD><CODE>value</CODE> - value to be associated with the specified key.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> or <code>value</code> is
<code>null</code>.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.</DL>
</DD>
</DL>
<HR>
<A NAME="get(java.lang.String, java.lang.String)"><!-- --></A><H3>
get</H3>
<PRE>
java.lang.String <B>get</B>(java.lang.String key,
java.lang.String def)</PRE>
<DL>
<DD>Returns the value associated with the specified <code>key</code> in this
node. Returns the specified default if there is no value associated with
the <code>key</code>, or the backing store is inaccessible.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key whose associated value is to be returned.<DD><CODE>def</CODE> - the value to be returned in the event that this node has no
value associated with <code>key</code> or the backing store is
inaccessible.
<DT><B>Returns:</B><DD>the value associated with <code>key</code>, or <code>def</code> if
no value is associated with <code>key</code>.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>. (A
<code>null</code> default <i>is </i> permitted.)</DL>
</DD>
</DL>
<HR>
<A NAME="remove(java.lang.String)"><!-- --></A><H3>
remove</H3>
<PRE>
void <B>remove</B>(java.lang.String key)</PRE>
<DL>
<DD>Removes the value associated with the specified <code>key</code> in this
node, if any.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key whose mapping is to be removed from this node.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#get(java.lang.String, java.lang.String)"><CODE>get(String,String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="clear()"><!-- --></A><H3>
clear</H3>
<PRE>
void <B>clear</B>()
throws <A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></PRE>
<DL>
<DD>Removes all of the properties (key-value associations) in this node. This
call has no effect on any descendants of this node.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></CODE> - if this operation cannot be completed due
to a failure in the backing store, or inability to communicate
with it.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#remove(java.lang.String)"><CODE>remove(String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="putInt(java.lang.String, int)"><!-- --></A><H3>
putInt</H3>
<PRE>
void <B>putInt</B>(java.lang.String key,
int value)</PRE>
<DL>
<DD>Associates a <code>String</code> object representing the specified <code>int</code>
value with the specified <code>key</code> in this node. The associated string
is the one that would be returned if the <code>int</code> value were passed to
<code>Integer.toString(int)</code>. This method is intended for use in
conjunction with <A HREF="../../../../org/osgi/service/prefs/Preferences.html#getInt(java.lang.String, int)"><CODE>getInt(String, int)</CODE></A> method.
<p>
Implementor's note: it is <i>not </i> necessary that the property value
be represented by a <code>String</code> object in the backing store. If the
backing store supports integer values, it is not unreasonable to use
them. This implementation detail is not visible through the
<code>Preferences</code> API, which allows the value to be read as an
<code>int</code> (with <code>getInt</code> or a <code>String</code> (with <code>get</code>)
type.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key with which the string form of value is to be associated.<DD><CODE>value</CODE> - <code>value</code> whose string form is to be associated with
<code>key</code>.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getInt(java.lang.String, int)"><CODE>getInt(String,int)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getInt(java.lang.String, int)"><!-- --></A><H3>
getInt</H3>
<PRE>
int <B>getInt</B>(java.lang.String key,
int def)</PRE>
<DL>
<DD>Returns the <code>int</code> value represented by the <code>String</code> object
associated with the specified <code>key</code> in this node. The
<code>String</code> object is converted to an <code>int</code> as by
<code>Integer.parseInt(String)</code>. Returns the specified default if there
is no value associated with the <code>key</code>, the backing store is
inaccessible, or if <code>Integer.parseInt(String)</code> would throw a
<code>NumberFormatException</code> if the associated <code>value</code> were
passed. This method is intended for use in conjunction with the
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#putInt(java.lang.String, int)"><CODE>putInt(String, int)</CODE></A> method.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key whose associated value is to be returned as an <code>int</code>
.<DD><CODE>def</CODE> - the value to be returned in the event that this node has no
value associated with <code>key</code> or the associated value cannot
be interpreted as an <code>int</code> or the backing store is
inaccessible.
<DT><B>Returns:</B><DD>the <code>int</code> value represented by the <code>String</code> object
associated with <code>key</code> in this node, or <code>def</code> if the
associated value does not exist or cannot be interpreted as an
<code>int</code> type.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#putInt(java.lang.String, int)"><CODE>putInt(String,int)</CODE></A>,
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#get(java.lang.String, java.lang.String)"><CODE>get(String,String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="putLong(java.lang.String, long)"><!-- --></A><H3>
putLong</H3>
<PRE>
void <B>putLong</B>(java.lang.String key,
long value)</PRE>
<DL>
<DD>Associates a <code>String</code> object representing the specified
<code>long</code> value with the specified <code>key</code> in this node. The
associated <code>String</code> object is the one that would be returned if the
<code>long</code> value were passed to <code>Long.toString(long)</code>. This
method is intended for use in conjunction with the
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#getLong(java.lang.String, long)"><CODE>getLong(String, long)</CODE></A> method.
<p>
Implementor's note: it is <i>not </i> necessary that the <code>value</code> be
represented by a <code>String</code> type in the backing store. If the backing
store supports <code>long</code> values, it is not unreasonable to use them.
This implementation detail is not visible through the <code>Preferences</code>
API, which allows the value to be read as a <code>long</code> (with
<code>getLong</code> or a <code>String</code> (with <code>get</code>) type.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - <code>key</code> with which the string form of <code>value</code> is to
be associated.<DD><CODE>value</CODE> - <code>value</code> whose string form is to be associated with
<code>key</code>.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getLong(java.lang.String, long)"><CODE>getLong(String,long)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getLong(java.lang.String, long)"><!-- --></A><H3>
getLong</H3>
<PRE>
long <B>getLong</B>(java.lang.String key,
long def)</PRE>
<DL>
<DD>Returns the <code>long</code> value represented by the <code>String</code> object
associated with the specified <code>key</code> in this node. The
<code>String</code> object is converted to a <code>long</code> as by
<code>Long.parseLong(String)</code>. Returns the specified default if there is
no value associated with the <code>key</code>, the backing store is
inaccessible, or if <code>Long.parseLong(String)</code> would throw a
<code>NumberFormatException</code> if the associated <code>value</code> were
passed. This method is intended for use in conjunction with the
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#putLong(java.lang.String, long)"><CODE>putLong(String, long)</CODE></A> method.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - <code>key</code> whose associated value is to be returned as a
<code>long</code> value.<DD><CODE>def</CODE> - the value to be returned in the event that this node has no
value associated with <code>key</code> or the associated value cannot
be interpreted as a <code>long</code> type or the backing store is
inaccessible.
<DT><B>Returns:</B><DD>the <code>long</code> value represented by the <code>String</code> object
associated with <code>key</code> in this node, or <code>def</code> if the
associated value does not exist or cannot be interpreted as a
<code>long</code> type.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#putLong(java.lang.String, long)"><CODE>putLong(String,long)</CODE></A>,
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#get(java.lang.String, java.lang.String)"><CODE>get(String,String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="putBoolean(java.lang.String, boolean)"><!-- --></A><H3>
putBoolean</H3>
<PRE>
void <B>putBoolean</B>(java.lang.String key,
boolean value)</PRE>
<DL>
<DD>Associates a <code>String</code> object representing the specified
<code>boolean</code> value with the specified key in this node. The associated
string is "true" if the value is <code>true</code>, and "false" if it is
<code>false</code>. This method is intended for use in conjunction with the
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#getBoolean(java.lang.String, boolean)"><CODE>getBoolean(String, boolean)</CODE></A> method.
<p>
Implementor's note: it is <i>not </i> necessary that the value be
represented by a string in the backing store. If the backing store
supports <code>boolean</code> values, it is not unreasonable to use them. This
implementation detail is not visible through the <code>Preferences
</code> API, which
allows the value to be read as a <code>boolean</code> (with <code>getBoolean</code>
) or a <code>String</code> (with <code>get</code>) type.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - <code>key</code> with which the string form of value is to be
associated.<DD><CODE>value</CODE> - value whose string form is to be associated with <code>key</code>
.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getBoolean(java.lang.String, boolean)"><CODE>getBoolean(String,boolean)</CODE></A>,
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#get(java.lang.String, java.lang.String)"><CODE>get(String,String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getBoolean(java.lang.String, boolean)"><!-- --></A><H3>
getBoolean</H3>
<PRE>
boolean <B>getBoolean</B>(java.lang.String key,
boolean def)</PRE>
<DL>
<DD>Returns the <code>boolean</code> value represented by the <code>String</code>
object associated with the specified <code>key</code> in this node. Valid
strings are "true", which represents <code>true</code>, and "false", which
represents <code>false</code>. Case is ignored, so, for example, "TRUE" and
"False" are also valid. This method is intended for use in conjunction
with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#putBoolean(java.lang.String, boolean)"><CODE>putBoolean(String, boolean)</CODE></A> method.
<p>
Returns the specified default if there is no value associated with the
<code>key</code>, the backing store is inaccessible, or if the associated
value is something other than "true" or "false", ignoring case.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - <code>key</code> whose associated value is to be returned as a
<code>boolean</code>.<DD><CODE>def</CODE> - the value to be returned in the event that this node has no
value associated with <code>key</code> or the associated value cannot
be interpreted as a <code>boolean</code> or the backing store is
inaccessible.
<DT><B>Returns:</B><DD>the <code>boolean</code> value represented by the <code>String</code>
object associated with <code>key</code> in this node, or <code>null</code>
if the associated value does not exist or cannot be interpreted
as a <code>boolean</code>.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#get(java.lang.String, java.lang.String)"><CODE>get(String,String)</CODE></A>,
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#putBoolean(java.lang.String, boolean)"><CODE>putBoolean(String,boolean)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="putFloat(java.lang.String, float)"><!-- --></A><H3>
putFloat</H3>
<PRE>
void <B>putFloat</B>(java.lang.String key,
float value)</PRE>
<DL>
<DD>Associates a <code>String</code> object representing the specified
<code>float</code> value with the specified <code>key</code> in this node. The
associated <code>String</code> object is the one that would be returned if the
<code>float</code> value were passed to <code>Float.toString(float)</code>. This
method is intended for use in conjunction with the
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#getFloat(java.lang.String, float)"><CODE>getFloat(String, float)</CODE></A> method.
<p>
Implementor's note: it is <i>not </i> necessary that the value be
represented by a string in the backing store. If the backing store
supports <code>float</code> values, it is not unreasonable to use them. This
implementation detail is not visible through the <code>Preferences
</code> API, which
allows the value to be read as a <code>float</code> (with <code>getFloat</code>) or
a <code>String</code> (with <code>get</code>) type.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - <code>key</code> with which the string form of value is to be
associated.<DD><CODE>value</CODE> - value whose string form is to be associated with <code>key</code>
.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getFloat(java.lang.String, float)"><CODE>getFloat(String,float)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getFloat(java.lang.String, float)"><!-- --></A><H3>
getFloat</H3>
<PRE>
float <B>getFloat</B>(java.lang.String key,
float def)</PRE>
<DL>
<DD>Returns the float <code>value</code> represented by the <code>String</code> object
associated with the specified <code>key</code> in this node. The
<code>String</code> object is converted to a <code>float</code> value as by
<code>Float.parseFloat(String)</code>. Returns the specified default if there
is no value associated with the <code>key</code>, the backing store is
inaccessible, or if <code>Float.parseFloat(String)</code> would throw a
<code>NumberFormatException</code> if the associated value were passed. This
method is intended for use in conjunction with the
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#putFloat(java.lang.String, float)"><CODE>putFloat(String, float)</CODE></A> method.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - <code>key</code> whose associated value is to be returned as a
<code>float</code> value.<DD><CODE>def</CODE> - the value to be returned in the event that this node has no
value associated with <code>key</code> or the associated value cannot
be interpreted as a <code>float</code> type or the backing store is
inaccessible.
<DT><B>Returns:</B><DD>the <code>float</code> value represented by the string associated with
<code>key</code> in this node, or <code>def</code> if the associated value
does not exist or cannot be interpreted as a <code>float</code> type.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#putFloat(java.lang.String, float)"><CODE>putFloat(String,float)</CODE></A>,
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#get(java.lang.String, java.lang.String)"><CODE>get(String,String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="putDouble(java.lang.String, double)"><!-- --></A><H3>
putDouble</H3>
<PRE>
void <B>putDouble</B>(java.lang.String key,
double value)</PRE>
<DL>
<DD>Associates a <code>String</code> object representing the specified
<code>double</code> value with the specified <code>key</code> in this node. The
associated <code>String</code> object is the one that would be returned if the
<code>double</code> value were passed to <code>Double.toString(double)</code>. This
method is intended for use in conjunction with the
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#getDouble(java.lang.String, double)"><CODE>getDouble(String, double)</CODE></A> method
<p>
Implementor's note: it is <i>not </i> necessary that the value be
represented by a string in the backing store. If the backing store
supports <code>double</code> values, it is not unreasonable to use them. This
implementation detail is not visible through the <code>Preferences
</code> API, which
allows the value to be read as a <code>double</code> (with <code>getDouble</code>)
or a <code>String</code> (with <code>get</code>) type.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - <code>key</code> with which the string form of value is to be
associated.<DD><CODE>value</CODE> - value whose string form is to be associated with <code>key</code>
.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getDouble(java.lang.String, double)"><CODE>getDouble(String,double)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getDouble(java.lang.String, double)"><!-- --></A><H3>
getDouble</H3>
<PRE>
double <B>getDouble</B>(java.lang.String key,
double def)</PRE>
<DL>
<DD>Returns the <code>double</code> value represented by the <code>String</code>
object associated with the specified <code>key</code> in this node. The
<code>String</code> object is converted to a <code>double</code> value as by
<code>Double.parseDouble(String)</code>. Returns the specified default if
there is no value associated with the <code>key</code>, the backing store
is inaccessible, or if <code>Double.parseDouble(String)</code> would throw
a <code>NumberFormatException</code> if the associated value were passed.
This method is intended for use in conjunction with the
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#putDouble(java.lang.String, double)"><CODE>putDouble(java.lang.String, double)</CODE></A> method.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - <code>key</code> whose associated value is to be returned as a
<code>double</code> value.<DD><CODE>def</CODE> - the value to be returned in the event that this node has no
value associated with <code>key</code> or the associated value
cannot be interpreted as a <code>double</code> type or the backing
store is inaccessible.
<DT><B>Returns:</B><DD>the <code>double</code> value represented by the <code>String</code>
object associated with <code>key</code> in this node, or
<code>def</code> if the associated value does not exist or cannot
be interpreted as a <code>double</code> type.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#putDouble(java.lang.String, double)"><CODE>putDouble(String,double)</CODE></A>,
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#get(java.lang.String, java.lang.String)"><CODE>get(String,String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="putByteArray(java.lang.String, byte[])"><!-- --></A><H3>
putByteArray</H3>
<PRE>
void <B>putByteArray</B>(java.lang.String key,
byte[] value)</PRE>
<DL>
<DD>Associates a <code>String</code> object representing the specified
<code>byte[]</code> with the specified <code>key</code> in this node. The
associated <code>String</code> object the <i>Base64 </i> encoding of the
<code>byte[]</code>, as defined in <a
href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 </a>, Section 6.8,
with one minor change: the string will consist solely of characters from
the <i>Base64 Alphabet </i>; it will not contain any newline characters.
This method is intended for use in conjunction with the
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#getByteArray(java.lang.String, byte[])"><CODE>getByteArray(String, byte[])</CODE></A> method.
<p>
Implementor's note: it is <i>not </i> necessary that the value be
represented by a <code>String</code> type in the backing store. If the backing
store supports <code>byte[]</code> values, it is not unreasonable to use them.
This implementation detail is not visible through the <code>Preferences</code>
API, which allows the value to be read as an a <code>byte[]</code> object
(with <code>getByteArray</code>) or a <code>String</code> object (with <code>get</code>
).
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - <code>key</code> with which the string form of <code>value</code> is to
be associated.<DD><CODE>value</CODE> - <code>value</code> whose string form is to be associated with
<code>key</code>.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> or <code>value</code> is
<code>null</code>.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#getByteArray(java.lang.String, byte[])"><CODE>getByteArray(String,byte[])</CODE></A>,
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#get(java.lang.String, java.lang.String)"><CODE>get(String,String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getByteArray(java.lang.String, byte[])"><!-- --></A><H3>
getByteArray</H3>
<PRE>
byte[] <B>getByteArray</B>(java.lang.String key,
byte[] def)</PRE>
<DL>
<DD>Returns the <code>byte[]</code> value represented by the <code>String</code> object
associated with the specified <code>key</code> in this node. Valid
<code>String</code> objects are <i>Base64 </i> encoded binary data, as defined
in <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 </a>, Section
6.8, with one minor change: the string must consist solely of characters
from the <i>Base64 Alphabet </i>; no newline characters or extraneous
characters are permitted. This method is intended for use in conjunction
with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#putByteArray(java.lang.String, byte[])"><CODE>putByteArray(String, byte[])</CODE></A> method.
<p>
Returns the specified default if there is no value associated with the
<code>key</code>, the backing store is inaccessible, or if the associated
value is not a valid Base64 encoded byte array (as defined above).
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - <code>key</code> whose associated value is to be returned as a
<code>byte[]</code> object.<DD><CODE>def</CODE> - the value to be returned in the event that this node has no
value associated with <code>key</code> or the associated value cannot
be interpreted as a <code>byte[]</code> type, or the backing store is
inaccessible.
<DT><B>Returns:</B><DD>the <code>byte[]</code> value represented by the <code>String</code> object
associated with <code>key</code> in this node, or <code>def</code> if the
associated value does not exist or cannot be interpreted as a
<code>byte[]</code>.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>key</code> is <code>null</code>. (A
<code>null</code> value for <code>def</code> <i>is </i> permitted.)
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#get(java.lang.String, java.lang.String)"><CODE>get(String,String)</CODE></A>,
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#putByteArray(java.lang.String, byte[])"><CODE>putByteArray(String,byte[])</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="keys()"><!-- --></A><H3>
keys</H3>
<PRE>
java.lang.String[] <B>keys</B>()
throws <A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></PRE>
<DL>
<DD>Returns all of the keys that have an associated value in this node. (The
returned array will be of size zero if this node has no preferences and
not <code>null</code>!)
<P>
<DD><DL>
<DT><B>Returns:</B><DD>an array of the keys that have an associated value in this node.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></CODE> - if this operation cannot be completed due
to a failure in the backing store, or inability to communicate
with it.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.</DL>
</DD>
</DL>
<HR>
<A NAME="childrenNames()"><!-- --></A><H3>
childrenNames</H3>
<PRE>
java.lang.String[] <B>childrenNames</B>()
throws <A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></PRE>
<DL>
<DD>Returns the names of the children of this node. (The returned array will
be of size zero if this node has no children and not <code>null</code>!)
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the names of the children of this node.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></CODE> - if this operation cannot be completed due
to a failure in the backing store, or inability to communicate
with it.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.</DL>
</DD>
</DL>
<HR>
<A NAME="parent()"><!-- --></A><H3>
parent</H3>
<PRE>
<A HREF="../../../../org/osgi/service/prefs/Preferences.html" title="interface in org.osgi.service.prefs">Preferences</A> <B>parent</B>()</PRE>
<DL>
<DD>Returns the parent of this node, or <code>null</code> if this is the root.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the parent of this node.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.</DL>
</DD>
</DL>
<HR>
<A NAME="node(java.lang.String)"><!-- --></A><H3>
node</H3>
<PRE>
<A HREF="../../../../org/osgi/service/prefs/Preferences.html" title="interface in org.osgi.service.prefs">Preferences</A> <B>node</B>(java.lang.String pathName)</PRE>
<DL>
<DD>Returns a named <code>Preferences</code> object (node), creating it and any
of its ancestors if they do not already exist. Accepts a relative or
absolute pathname. Absolute pathnames (which begin with <code>'/'</code>)
are interpreted relative to the root of this node. Relative pathnames
(which begin with any character other than <code>'/'</code>) are
interpreted relative to this node itself. The empty string (<code>""</code>)
is a valid relative pathname, referring to this node itself.
<p>
If the returned node did not exist prior to this call, this node and any
ancestors that were created by this call are not guaranteed to become
persistent until the <code>flush</code> method is called on the returned
node (or one of its descendants).
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>pathName</CODE> - the path name of the <code>Preferences</code> object to
return.
<DT><B>Returns:</B><DD>the specified <code>Preferences</code> object.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if the path name is invalid.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.
<DD><CODE>java.lang.NullPointerException</CODE> - if path name is <code>null</code>.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#flush()"><CODE>flush()</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="nodeExists(java.lang.String)"><!-- --></A><H3>
nodeExists</H3>
<PRE>
boolean <B>nodeExists</B>(java.lang.String pathName)
throws <A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></PRE>
<DL>
<DD>Returns true if the named node exists. Accepts a relative or absolute
pathname. Absolute pathnames (which begin with <code>'/'</code>) are
interpreted relative to the root of this node. Relative pathnames (which
begin with any character other than <code>'/'</code>) are interpreted
relative to this node itself. The pathname <code>""</code> is valid, and
refers to this node itself.
<p>
If this node (or an ancestor) has already been removed with the
<A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method, it <i>is </i> legal to invoke this method,
but only with the pathname <code>""</code>; the invocation will return
<code>false</code>. Thus, the idiom <code>p.nodeExists("")</code> may be
used to test whether <code>p</code> has been removed.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>pathName</CODE> - the path name of the node whose existence is to be
checked.
<DT><B>Returns:</B><DD>true if the specified node exists.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></CODE> - if this operation cannot be completed due
to a failure in the backing store, or inability to communicate
with it.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method and
<code>pathname</code> is not the empty string (<code>""</code>).
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if the path name is invalid (i.e., it
contains multiple consecutive slash characters, or ends with a
slash character and is more than one character long).</DL>
</DD>
</DL>
<HR>
<A NAME="removeNode()"><!-- --></A><H3>
removeNode</H3>
<PRE>
void <B>removeNode</B>()
throws <A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></PRE>
<DL>
<DD>Removes this node and all of its descendants, invalidating any properties
contained in the removed nodes. Once a node has been removed, attempting
any method other than <code>name()</code>,<code>absolutePath()</code> or
<code>nodeExists("")</code> on the corresponding <code>Preferences</code>
instance will fail with an <code>IllegalStateException</code>. (The
methods defined on <code>Object</code> can still be invoked on a node after
it has been removed; they will not throw <code>IllegalStateException</code>.)
<p>
The removal is not guaranteed to be persistent until the <code>flush</code>
method is called on the parent of this node.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has already
been removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.
<DD><CODE><A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></CODE> - if this operation cannot be completed due
to a failure in the backing store, or inability to communicate
with it.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#flush()"><CODE>flush()</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="name()"><!-- --></A><H3>
name</H3>
<PRE>
java.lang.String <B>name</B>()</PRE>
<DL>
<DD>Returns this node's name, relative to its parent.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>this node's name, relative to its parent.</DL>
</DD>
</DL>
<HR>
<A NAME="absolutePath()"><!-- --></A><H3>
absolutePath</H3>
<PRE>
java.lang.String <B>absolutePath</B>()</PRE>
<DL>
<DD>Returns this node's absolute path name. Note that:
<ul>
<li>Root node - The path name of the root node is <code>"/"</code>.
<li>Slash at end - Path names other than that of the root node may not
end in slash (<code>'/'</code>).
<li>Unusual names -<code>"."</code> and <code>".."</code> have <i>no </i>
special significance in path names.
<li>Illegal names - The only illegal path names are those that contain
multiple consecutive slashes, or that end in slash and are not the root.
</ul>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>this node's absolute path name.</DL>
</DD>
</DL>
<HR>
<A NAME="flush()"><!-- --></A><H3>
flush</H3>
<PRE>
void <B>flush</B>()
throws <A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></PRE>
<DL>
<DD>Forces any changes in the contents of this node and its descendants to
the persistent store.
<p>
Once this method returns successfully, it is safe to assume that all
changes made in the subtree rooted at this node prior to the method
invocation have become permanent.
<p>
Implementations are free to flush changes into the persistent store at
any time. They do not need to wait for this method to be called.
<p>
When a flush occurs on a newly created node, it is made persistent, as
are any ancestors (and descendants) that have yet to be made persistent.
Note however that any properties value changes in ancestors are <i>not
</i> guaranteed to be made persistent.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></CODE> - if this operation cannot be completed due
to a failure in the backing store, or inability to communicate
with it.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#sync()"><CODE>sync()</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="sync()"><!-- --></A><H3>
sync</H3>
<PRE>
void <B>sync</B>()
throws <A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></PRE>
<DL>
<DD>Ensures that future reads from this node and its descendants reflect any
changes that were committed to the persistent store (from any VM) prior
to the <code>sync</code> invocation. As a side-effect, forces any changes
in the contents of this node and its descendants to the persistent store,
as if the <code>flush</code> method had been invoked on this node.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../org/osgi/service/prefs/BackingStoreException.html" title="class in org.osgi.service.prefs">BackingStoreException</A></CODE> - if this operation cannot be completed due
to a failure in the backing store, or inability to communicate
with it.
<DD><CODE>java.lang.IllegalStateException</CODE> - if this node (or an ancestor) has been
removed with the <A HREF="../../../../org/osgi/service/prefs/Preferences.html#removeNode()"><CODE>removeNode()</CODE></A> method.<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/prefs/Preferences.html#flush()"><CODE>flush()</CODE></A></DL>
</DD>
</DL>
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