id.html

jxta的api库

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<B>Field Detail</B></FONT></TD>
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<A NAME="URIEncodingName"><!-- --></A><H3>
URIEncodingName</H3>
<PRE>
public static final java.lang.String <B>URIEncodingName</B></PRE>
<DL>
<DD>This defines the URI scheme that we will be using to present JXTA IDs.
 JXTA IDs are encoded for presentation into URIs (see
 <a href="http://www.ietf.org/rfc/rfc2396.txt">IETF RFC 2396 Uniform Resource Identifiers (URI) : Generic Syntax</a>
 ) as URNs (see
 <a href="http://www.ietf.org/rfc/rfc2141.txt">IETF RFC 2141 Uniform Resource Names (URN) Syntax</a>
 ).
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../constant-values.html#net.jxta.id.ID.URIEncodingName">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="URNNamespace"><!-- --></A><H3>
URNNamespace</H3>
<PRE>
public static final java.lang.String <B>URNNamespace</B></PRE>
<DL>
<DD>This defines the URN Namespace that we will be using to present JXTA IDs.
  The namespace allows URN resolvers to determine which sub-resolver to use
  to resolve URN references. All JXTA IDs are presented in this namespace.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../constant-values.html#net.jxta.id.ID.URNNamespace">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="nullID"><!-- --></A><H3>
nullID</H3>
<PRE>
public static final <A HREF="../../../net/jxta/id/ID.html" title="class in net.jxta.id">ID</A> <B>nullID</B></PRE>
<DL>
<DD>The null ID. The NullID is often used as a placeholder in fields which
  are uninitialized.
 This is a singleton within the scope of a VM.
<P>
<DL>
</DL>
</DL>

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<A NAME="ID()"><!-- --></A><H3>
ID</H3>
<PRE>
protected <B>ID</B>()</PRE>
<DL>
<DD>Constructor for IDs.
<P>
</DL>

<!-- ============ METHOD DETAIL ========== -->

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<A NAME="clone()"><!-- --></A><H3>
clone</H3>
<PRE>
public final java.lang.Object <B>clone</B>()</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>IDs are immutable. clone() is never needed.</I>
<P>
<DD>Returns a "clone" of this ID. <strong>"this" IS ALWAYS RETURNED</strong>
  because IDs are immutable objects.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the same object you passed in.</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Returns a string representation of the ID. This representation should be
  used primarily for debugging purposes. For most other situations IDs
  should be externalized as Java URL Objects via <A HREF="../../../net/jxta/id/ID.html#getURL()"><CODE>getURL</CODE></A>.

  <p/>The default implementation is the toString representation of the URL
  representation.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>String containing the URI</DL>
</DD>
</DL>
<HR>

<A NAME="getIDFormat()"><!-- --></A><H3>
getIDFormat</H3>
<PRE>
public abstract java.lang.String <B>getIDFormat</B>()</PRE>
<DL>
<DD>Returns a string identifier which indicates which ID format is
  used by this ID instance.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a string identifier which indicates which ID format is
  used by this ID instance.</DL>
</DD>
</DL>
<HR>

<A NAME="getUniqueValue()"><!-- --></A><H3>
getUniqueValue</H3>
<PRE>
public abstract java.lang.Object <B>getUniqueValue</B>()</PRE>
<DL>
<DD>Returns an object containing the unique value of the ID. This object must
  provide implementations of toString() and hashCode() that are canonical
  and consistent from run-to-run given the same input values. Beyond
  this nothing should be assumed about the nature of this object. For some
  implementations the object returned may be <code>this</code>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>Object which can provide canonical representations of the ID.</DL>
</DD>
</DL>
<HR>

<A NAME="getURL()"><!-- --></A><H3>
getURL</H3>
<PRE>
public abstract java.net.URL <B>getURL</B>()</PRE>
<DL>
<DD>Returns a URI (URL in Java nomenclature) representation of the ID.
 <CODE>URLs</CODE> are the prefered way of externalizing and
  presenting JXTA IDs. The <A HREF="../../../net/jxta/id/IDFactory.html" title="class in net.jxta.id"><CODE>JXTA ID Factory</CODE></A>
  can be used to construct ID Objects from URLs containing JXTA IDs.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>URL Object containing the URI<DT><B>See Also:</B><DD><CODE>URL</CODE>, 
<A HREF="../../../net/jxta/id/IDFactory.html#fromURL(java.net.URL)"><CODE>IDFactory.fromURL( java.net.URL )</CODE></A></DL>
</DD>
</DL>
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