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Envelope
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org.osgi.service.wireadmin</FONT>
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Interface Envelope</H2>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/osgi/service/wireadmin/BasicEnvelope.html" title="class in org.osgi.service.wireadmin">BasicEnvelope</A></DD>
</DL>
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<DT><PRE>public interface <B>Envelope</B></DL>
</PRE>
<P>
Identifies a contained value.
An <code>Envelope</code> object combines a status value, an identification
object and a scope name. The <code>Envelope</code> object allows the use of
standard Java types when a Producer service can produce more than one kind of
object. The <code>Envelope</code> object allows the Consumer service to
recognize the kind of object that is received. For example, a door lock could
be represented by a <code>Boolean</code> object. If the <code>Producer</code>
service would send such a <code>Boolean</code> object, then the Consumer
service would not know what door the <code>Boolean</code> object represented.
The <code>Envelope</code> object contains an identification object so the
Consumer service can discriminate between different kinds of values. The
identification object may be a simple <code>String</code> object, but it can
also be a domain specific object that is mutually agreed by the Producer and
the Consumer service. This object can then contain relevant information that
makes the identification easier.
<p>
The scope name of the envelope is used for security. The Wire object must
verify that any <code>Envelope</code> object send through the <code>update</code>
method or coming from the <code>poll</code> method has a scope name that
matches the permissions of both the Producer service and the Consumer service
involved. The wireadmin package also contains a class <code>BasicEnvelope</code>
that implements the methods of this interface.
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/wireadmin/WirePermission.html" title="class in org.osgi.service.wireadmin"><CODE>WirePermission</CODE></A>,
<A HREF="../../../../org/osgi/service/wireadmin/BasicEnvelope.html" title="class in org.osgi.service.wireadmin"><CODE>BasicEnvelope</CODE></A></DL>
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<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/wireadmin/Envelope.html#getIdentification()">getIdentification</A></B>()</CODE>
<BR>
Return the identification of this <code>Envelope</code> object.</TD>
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<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/wireadmin/Envelope.html#getScope()">getScope</A></B>()</CODE>
<BR>
Return the scope name of this <code>Envelope</code> object.</TD>
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<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/wireadmin/Envelope.html#getValue()">getValue</A></B>()</CODE>
<BR>
Return the value associated with this <code>Envelope</code> object.</TD>
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<A NAME="getValue()"><!-- --></A><H3>
getValue</H3>
<PRE>
java.lang.Object <B>getValue</B>()</PRE>
<DL>
<DD>Return the value associated with this <code>Envelope</code> object.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the value of the status item, or <code>null</code> when no item is
associated with this object.</DL>
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<A NAME="getIdentification()"><!-- --></A><H3>
getIdentification</H3>
<PRE>
java.lang.Object <B>getIdentification</B>()</PRE>
<DL>
<DD>Return the identification of this <code>Envelope</code> object.
An identification may be of any Java type. The type must be mutually
agreed between the Consumer and Producer services.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>an object which identifies the status item in the address space
of the composite producer, must not be null.</DL>
</DD>
</DL>
<HR>
<A NAME="getScope()"><!-- --></A><H3>
getScope</H3>
<PRE>
java.lang.String <B>getScope</B>()</PRE>
<DL>
<DD>Return the scope name of this <code>Envelope</code> object.
Scope names are used to restrict the communication between the Producer
and Consumer services. Only <code>Envelopes</code> objects with a scope
name that is permitted for the Producer and the Consumer services must be
passed through a <code>Wire</code> object.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the security scope for the status item, must not be null.</DL>
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