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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<div class="subTitle">org.osgi.service.dmt</div>
<h2 title="Class Uri" class="title">Class Uri</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>org.osgi.service.dmt.Uri</li>
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<pre>public final class <span class="typeNameLabel">Uri</span>
extends java.lang.Object</pre>
<div class="block">This class contains static utility methods to manipulate DMT URIs.
 <p>
 Syntax of valid DMT URIs:
 <ul>
 <li>A slash (<code>'/'</code> &#92;u002F) is the separator of the node names.
 Slashes used in node name must therefore be escaped using a backslash slash (
 <code>"\/"</code>). The backslash must be escaped with a double backslash
 sequence. A backslash found must be ignored when it is not followed by a
 slash or backslash.</li>
 <li>The node name can be constructed using full Unicode character set (except
 the Supplementary code, not being supported by CLDC/CDC). However, using the
 full Unicode character set for node names is discouraged because the encoding
 in the underlying storage as well as the encoding needed in communications
 can create significant performance and memory usage overhead. Names that are
 restricted to the URI set <code>[-a-zA-Z0-9_.!~*'()]</code> are most efficient.</li>
 <li>URIs used in the DMT must be treated and interpreted as case sensitive.</li>
 <li>No End Slash: URI must not end with the delimiter slash (<code>'/'</code>
 &#92;u002F). This implies that the root node must be denoted as <code>"."</code>
 and not <code>"./"</code>.</li>
 <li>No parent denotation: URI must not be constructed using the character
 sequence <code>"../"</code> to traverse the tree upwards.</li>
 <li>Single Root: The character sequence <code>"./"</code> must not be used
 anywhere else but in the beginning of a URI.</li>
 </ul></div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/Uri.html#PATH_SEPARATOR">PATH_SEPARATOR</a></span></code>
<div class="block">This constant stands for a string identifying the path separator in the
 DmTree ("/").</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static char</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/Uri.html#PATH_SEPARATOR_CHAR">PATH_SEPARATOR_CHAR</a></span></code>
<div class="block">This constant stands for a char identifying the path separator in the
 DmTree ('/').</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/Uri.html#ROOT_NODE">ROOT_NODE</a></span></code>
<div class="block">This constant stands for a string identifying the root of the DmTree
 (".").</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static char</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/Uri.html#ROOT_NODE_CHAR">ROOT_NODE_CHAR</a></span></code>
<div class="block">This constant stands for a char identifying the root of the DmTree ('.').</div>
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<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/Uri.html#decode-java.lang.String-">decode</a></span>(java.lang.String&nbsp;nodeName)</code>
<div class="block">Decode the node name so that back slash and forward slash are un-escaped
 from a back slash.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/Uri.html#encode-java.lang.String-">encode</a></span>(java.lang.String&nbsp;nodeName)</code>
<div class="block">Encode the node name so that back slash and forward slash are escaped
 with a back slash.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/Uri.html#isAbsoluteUri-java.lang.String-">isAbsoluteUri</a></span>(java.lang.String&nbsp;uri)</code>
<div class="block">Checks whether the specified URI is an absolute URI.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/Uri.html#isValidUri-java.lang.String-">isValidUri</a></span>(java.lang.String&nbsp;uri)</code>
<div class="block">Checks whether the specified URI is valid.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/Uri.html#mangle-java.lang.String-">mangle</a></span>(java.lang.String&nbsp;nodeName)</code>
<div class="block">Returns a node name that is valid for the tree operation methods, based
 on the given node name.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>static java.lang.String[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/Uri.html#toPath-java.lang.String-">toPath</a></span>(java.lang.String&nbsp;uri)</code>
<div class="block">Split the specified URI along the path separator '/' characters and
 return an array of URI segments.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/Uri.html#toUri-java.lang.String:A-">toUri</a></span>(java.lang.String[]&nbsp;path)</code>
<div class="block">Construct a URI from the specified URI segments.</div>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>ROOT_NODE</h4>
<pre>public static final&nbsp;java.lang.String ROOT_NODE</pre>
<div class="block">This constant stands for a string identifying the root of the DmTree
 (".").</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#org.osgi.service.dmt.Uri.ROOT_NODE">Constant Field Values</a></dd>
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<h4>ROOT_NODE_CHAR</h4>
<pre>public static final&nbsp;char ROOT_NODE_CHAR</pre>
<div class="block">This constant stands for a char identifying the root of the DmTree ('.').</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#org.osgi.service.dmt.Uri.ROOT_NODE_CHAR">Constant Field Values</a></dd>
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<h4>PATH_SEPARATOR</h4>
<pre>public static final&nbsp;java.lang.String PATH_SEPARATOR</pre>
<div class="block">This constant stands for a string identifying the path separator in the
 DmTree ("/").</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#org.osgi.service.dmt.Uri.PATH_SEPARATOR">Constant Field Values</a></dd>
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<h4>PATH_SEPARATOR_CHAR</h4>
<pre>public static final&nbsp;char PATH_SEPARATOR_CHAR</pre>
<div class="block">This constant stands for a char identifying the path separator in the
 DmTree ('/').</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#org.osgi.service.dmt.Uri.PATH_SEPARATOR_CHAR">Constant Field Values</a></dd>
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<h4>mangle</h4>
<pre>public static&nbsp;java.lang.String&nbsp;mangle(java.lang.String&nbsp;nodeName)</pre>
<div class="block">Returns a node name that is valid for the tree operation methods, based
 on the given node name. This transformation is not idempotent, so it must
 not be called with a parameter that is the result of a previous
 <code>mangle</code> method call.
 <p>
 Node name mangling is needed in the following cases:
 <ul>
 <li>if the name contains '/' or '\' characters</li>
 </ul>
 <p>
 A node name that does not suffer from either of these problems is
 guaranteed to remain unchanged by this method. Therefore the client may
 skip the mangling if the node name is known to be valid (though it is
 always safe to call this method).
 <p>
 The method returns the normalized <code>nodeName</code> as described below.
 Invalid node names are normalized in different ways, depending on the
 cause. If the name contains '/' or '\' characters, then these are simply
 escaped by inserting an additional '\' before each occurrence. If the
 length of the name does exceed the limit, the following mechanism is used
 to normalize it:
 <ul>
 <li>the SHA 1 digest of the name is calculated</li>
 <li>the digest is encoded with the base 64 algorithm</li>
 <li>all '/' characters in the encoded digest are replaced with '_'</li>
 <li>trailing '=' signs are removed</li>
 </ul></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nodeName</code> - the node name to be mangled (if necessary), must not be
        <code>null</code> or empty</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the normalized node name that is valid for tree operations</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if <code>nodeName</code> is <code>null</code></dd>
<dd><code>java.lang.IllegalArgumentException</code> - if <code>nodeName</code> is empty</dd>
</dl>
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<h4>toUri</h4>
<pre>public static&nbsp;java.lang.String&nbsp;toUri(java.lang.String[]&nbsp;path)</pre>
<div class="block">Construct a URI from the specified URI segments. The segments must
 already be mangled.
 <p>
 If the specified path is an empty array then an empty URI (<code>""</code>) is
 returned.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>path</code> - a possibly empty array of URI segments, must not be
        <code>null</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the URI created from the specified segments</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the specified path or any of its segments
         are <code>null</code></dd>
<dd><code>java.lang.IllegalArgumentException</code> - if the specified path contains too many
         or malformed segments or the resulting URI is too long</dd>
</dl>
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<h4>toPath</h4>
<pre>public static&nbsp;java.lang.String[]&nbsp;toPath(java.lang.String&nbsp;uri)</pre>
<div class="block">Split the specified URI along the path separator '/' characters and
 return an array of URI segments. Special characters in the returned
 segments are escaped. The returned array may be empty if the specified
 URI was empty.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>uri</code> - the URI to be split, must not be <code>null</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an array of URI segments created by splitting the specified URI</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the specified URI is <code>null</code></dd>
<dd><code>java.lang.IllegalArgumentException</code> - if the specified URI is malformed</dd>
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<h4>isAbsoluteUri</h4>
<pre>public static&nbsp;boolean&nbsp;isAbsoluteUri(java.lang.String&nbsp;uri)</pre>
<div class="block">Checks whether the specified URI is an absolute URI. An absolute URI
 contains the complete path to a node in the DMT starting from the DMT
 root (".").</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>uri</code> - the URI to be checked, must not be <code>null</code> and must
        contain a valid URI</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether the specified URI is absolute</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the specified URI is <code>null</code></dd>
<dd><code>java.lang.IllegalArgumentException</code> - if the specified URI is malformed</dd>
</dl>
</li>
</ul>
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<h4>encode</h4>
<pre>public static&nbsp;java.lang.String&nbsp;encode(java.lang.String&nbsp;nodeName)</pre>
<div class="block">Encode the node name so that back slash and forward slash are escaped
 with a back slash. This method is the reverse of <a href="../../../../org/osgi/service/dmt/Uri.html#decode-java.lang.String-"><code>decode(String)</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nodeName</code> - the node name to be encoded</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the encoded node name</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
</dl>
</li>
</ul>
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<h4>decode</h4>
<pre>public static&nbsp;java.lang.String&nbsp;decode(java.lang.String&nbsp;nodeName)</pre>
<div class="block">Decode the node name so that back slash and forward slash are un-escaped
 from a back slash.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nodeName</code> - the node name to be decoded</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the decoded node name</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
</dl>
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<h4>isValidUri</h4>
<pre>public static&nbsp;boolean&nbsp;isValidUri(java.lang.String&nbsp;uri)</pre>
<div class="block">Checks whether the specified URI is valid. A URI is considered valid if
 it meets the following constraints:
 <ul>
 <li>the URI is not <code>null</code>;</li>
 <li>the URI follows the syntax defined for valid DMT URIs;</li>
 </ul>
 The exact definition of the length of a URI and its segments is given in
 the descriptions of the <code>getMaxUriLength()</code> and
 <code>getMaxSegmentNameLength()</code> methods.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>uri</code> - the URI to be validated</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether the specified URI is valid</dd>
</dl>
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