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XPath (JDOM v1.x-snapshot)
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org.jdom.xpath</FONT>
<BR>
Class XPath</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>org.jdom.xpath.XPath</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable</DD>
</DL>
<HR>
<DL>
<DT><PRE>public abstract class <B>XPath</B><DT>extends java.lang.Object<DT>implements java.io.Serializable</DL>
</PRE>
<P>
A utility class for performing XPath calls on JDOM nodes, with a factory
interface for obtaining a first XPath instance. Users operate against this
class while XPath vendors can plug-in implementations underneath. Users
can choose an implementation using either <A HREF="../../../org/jdom/xpath/XPath.html#setXPathClass(java.lang.Class)"><CODE>setXPathClass(java.lang.Class)</CODE></A> or
the system property "org.jdom.xpath.class".
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>$Revision: 1.17 $, $Date: 2007/11/10 05:29:02 $</DD>
<DT><B>Author:</B></DT>
<DD>Laurent Bihanic</DD>
<DT><B>See Also:</B><DD><A HREF="../../../serialized-form.html#org.jdom.xpath.XPath">Serialized Form</A></DL>
<HR>
<P>
<!-- =========== FIELD SUMMARY =========== -->
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#JDOM_OBJECT_MODEL_URI">JDOM_OBJECT_MODEL_URI</A></B></CODE>
<BR>
The string passable to the JAXP 1.3 XPathFactory isObjectModelSupported()
method to query an XPath engine regarding its support for JDOM.</TD>
</TR>
</TABLE>
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<B>Constructor Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#XPath()">XPath</A></B>()</CODE>
<BR>
</TD>
</TR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#addNamespace(org.jdom.Namespace)">addNamespace</A></B>(<A HREF="../../../org/jdom/Namespace.html" title="class in org.jdom">Namespace</A> namespace)</CODE>
<BR>
Adds a namespace definition to the list of namespaces known of
this XPath expression.</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/jdom/xpath/XPath.html#addNamespace(java.lang.String, java.lang.String)">addNamespace</A></B>(java.lang.String prefix,
java.lang.String uri)</CODE>
<BR>
Adds a namespace definition (prefix and URI) to the list of
namespaces known of this XPath expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#getXPath()">getXPath</A></B>()</CODE>
<BR>
Returns the wrapped XPath expression as a string.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../org/jdom/xpath/XPath.html" title="class in org.jdom.xpath">XPath</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#newInstance(java.lang.String)">newInstance</A></B>(java.lang.String path)</CODE>
<BR>
Creates a new XPath wrapper object, compiling the specified
XPath expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract java.lang.Number</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#numberValueOf(java.lang.Object)">numberValueOf</A></B>(java.lang.Object context)</CODE>
<BR>
Returns the number value of the first node selected by applying
the wrapped XPath expression to the given context.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract java.util.List</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#selectNodes(java.lang.Object)">selectNodes</A></B>(java.lang.Object context)</CODE>
<BR>
Evaluates the wrapped XPath expression and returns the list
of selected items.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.util.List</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#selectNodes(java.lang.Object, java.lang.String)">selectNodes</A></B>(java.lang.Object context,
java.lang.String path)</CODE>
<BR>
Evaluates an XPath expression and returns the list of selected
items.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#selectSingleNode(java.lang.Object)">selectSingleNode</A></B>(java.lang.Object context)</CODE>
<BR>
Evaluates the wrapped XPath expression and returns the first
entry in the list of selected nodes (or atomics).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#selectSingleNode(java.lang.Object, java.lang.String)">selectSingleNode</A></B>(java.lang.Object context,
java.lang.String path)</CODE>
<BR>
Evaluates the wrapped XPath expression and returns the first
entry in the list of selected nodes (or atomics).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#setVariable(java.lang.String, java.lang.Object)">setVariable</A></B>(java.lang.String name,
java.lang.Object value)</CODE>
<BR>
Defines an XPath variable and sets its value.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#setXPathClass(java.lang.Class)">setXPathClass</A></B>(java.lang.Class aClass)</CODE>
<BR>
Sets the concrete XPath subclass to use when allocating XPath
instances.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#valueOf(java.lang.Object)">valueOf</A></B>(java.lang.Object context)</CODE>
<BR>
Returns the string value of the first node selected by applying
the wrapped XPath expression to the given context.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/jdom/xpath/XPath.html#writeReplace()">writeReplace</A></B>()</CODE>
<BR>
<i>[Serialization support]</i> Returns the alternative object
to write to the stream when serializing this object.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
<P>
<!-- ============ FIELD DETAIL =========== -->
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<B>Field Detail</B></FONT></TH>
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</TABLE>
<A NAME="JDOM_OBJECT_MODEL_URI"><!-- --></A><H3>
JDOM_OBJECT_MODEL_URI</H3>
<PRE>
public static final java.lang.String <B>JDOM_OBJECT_MODEL_URI</B></PRE>
<DL>
<DD>The string passable to the JAXP 1.3 XPathFactory isObjectModelSupported()
method to query an XPath engine regarding its support for JDOM. Defined
to be the well-known URI "http://jdom.org/jaxp/xpath/jdom".
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../constant-values.html#org.jdom.xpath.XPath.JDOM_OBJECT_MODEL_URI">Constant Field Values</A></DL>
</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_detail"><!-- --></A>
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<B>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="XPath()"><!-- --></A><H3>
XPath</H3>
<PRE>
public <B>XPath</B>()</PRE>
<DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<B>Method Detail</B></FONT></TH>
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<A NAME="newInstance(java.lang.String)"><!-- --></A><H3>
newInstance</H3>
<PRE>
public static <A HREF="../../../org/jdom/xpath/XPath.html" title="class in org.jdom.xpath">XPath</A> <B>newInstance</B>(java.lang.String path)
throws <A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></PRE>
<DL>
<DD>Creates a new XPath wrapper object, compiling the specified
XPath expression.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>path</CODE> - the XPath expression to wrap.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></CODE> - if the XPath expression is invalid.</DL>
</DD>
</DL>
<HR>
<A NAME="setXPathClass(java.lang.Class)"><!-- --></A><H3>
setXPathClass</H3>
<PRE>
public static void <B>setXPathClass</B>(java.lang.Class aClass)
throws <A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></PRE>
<DL>
<DD>Sets the concrete XPath subclass to use when allocating XPath
instances.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>aClass</CODE> - the concrete subclass of XPath.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if <code>aClass</code> is
<code>null</code>.
<DD><CODE><A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></CODE> - if <code>aClass</code> is
not a concrete subclass
of XPath.</DL>
</DD>
</DL>
<HR>
<A NAME="selectNodes(java.lang.Object)"><!-- --></A><H3>
selectNodes</H3>
<PRE>
public abstract java.util.List <B>selectNodes</B>(java.lang.Object context)
throws <A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></PRE>
<DL>
<DD>Evaluates the wrapped XPath expression and returns the list
of selected items.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - the node to use as context for evaluating
the XPath expression.
<DT><B>Returns:</B><DD>the list of selected items, which may be of types: <A HREF="../../../org/jdom/Element.html" title="class in org.jdom"><CODE>Element</CODE></A>,
<A HREF="../../../org/jdom/Attribute.html" title="class in org.jdom"><CODE>Attribute</CODE></A>, <A HREF="../../../org/jdom/Text.html" title="class in org.jdom"><CODE>Text</CODE></A>, <A HREF="../../../org/jdom/CDATA.html" title="class in org.jdom"><CODE>CDATA</CODE></A>,
<A HREF="../../../org/jdom/Comment.html" title="class in org.jdom"><CODE>Comment</CODE></A>, <A HREF="../../../org/jdom/ProcessingInstruction.html" title="class in org.jdom"><CODE>ProcessingInstruction</CODE></A>, Boolean,
Double, or String.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></CODE> - if the evaluation of the XPath
expression on the specified context
failed.</DL>
</DD>
</DL>
<HR>
<A NAME="selectSingleNode(java.lang.Object)"><!-- --></A><H3>
selectSingleNode</H3>
<PRE>
public abstract java.lang.Object <B>selectSingleNode</B>(java.lang.Object context)
throws <A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></PRE>
<DL>
<DD>Evaluates the wrapped XPath expression and returns the first
entry in the list of selected nodes (or atomics).
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - the node to use as context for evaluating
the XPath expression.
<DT><B>Returns:</B><DD>the first selected item, which may be of types: <A HREF="../../../org/jdom/Element.html" title="class in org.jdom"><CODE>Element</CODE></A>,
<A HREF="../../../org/jdom/Attribute.html" title="class in org.jdom"><CODE>Attribute</CODE></A>, <A HREF="../../../org/jdom/Text.html" title="class in org.jdom"><CODE>Text</CODE></A>, <A HREF="../../../org/jdom/CDATA.html" title="class in org.jdom"><CODE>CDATA</CODE></A>,
<A HREF="../../../org/jdom/Comment.html" title="class in org.jdom"><CODE>Comment</CODE></A>, <A HREF="../../../org/jdom/ProcessingInstruction.html" title="class in org.jdom"><CODE>ProcessingInstruction</CODE></A>, Boolean,
Double, String, or <code>null</code> if no item was selected.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></CODE> - if the evaluation of the XPath
expression on the specified context
failed.</DL>
</DD>
</DL>
<HR>
<A NAME="valueOf(java.lang.Object)"><!-- --></A><H3>
valueOf</H3>
<PRE>
public abstract java.lang.String <B>valueOf</B>(java.lang.Object context)
throws <A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></PRE>
<DL>
<DD>Returns the string value of the first node selected by applying
the wrapped XPath expression to the given context.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - the element to use as context for evaluating
the XPath expression.
<DT><B>Returns:</B><DD>the string value of the first node selected by applying
the wrapped XPath expression to the given context.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></CODE> - if the XPath expression is invalid or
its evaluation on the specified context
failed.</DL>
</DD>
</DL>
<HR>
<A NAME="numberValueOf(java.lang.Object)"><!-- --></A><H3>
numberValueOf</H3>
<PRE>
public abstract java.lang.Number <B>numberValueOf</B>(java.lang.Object context)
throws <A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></PRE>
<DL>
<DD>Returns the number value of the first node selected by applying
the wrapped XPath expression to the given context.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - the element to use as context for evaluating
the XPath expression.
<DT><B>Returns:</B><DD>the number value of the first node selected by applying
the wrapped XPath expression to the given context,
<code>null</code> if no node was selected or the
special value <CODE>Double.NaN</CODE>
(Not-a-Number) if the selected value can not be
converted into a number value.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></CODE> - if the XPath expression is invalid or
its evaluation on the specified context
failed.</DL>
</DD>
</DL>
<HR>
<A NAME="setVariable(java.lang.String, java.lang.Object)"><!-- --></A><H3>
setVariable</H3>
<PRE>
public abstract void <B>setVariable</B>(java.lang.String name,
java.lang.Object value)</PRE>
<DL>
<DD>Defines an XPath variable and sets its value.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the variable name.<DD><CODE>value</CODE> - the variable value.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if <code>name</code> is not
a valid XPath variable name
or if the value type is not
supported by the underlying
implementation</DL>
</DD>
</DL>
<HR>
<A NAME="addNamespace(org.jdom.Namespace)"><!-- --></A><H3>
addNamespace</H3>
<PRE>
public abstract void <B>addNamespace</B>(<A HREF="../../../org/jdom/Namespace.html" title="class in org.jdom">Namespace</A> namespace)</PRE>
<DL>
<DD>Adds a namespace definition to the list of namespaces known of
this XPath expression.
<p>
<strong>Note</strong>: In XPath, there is no such thing as a
'default namespace'. The empty prefix <b>always</b> resolves
to the empty namespace URI.</p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>namespace</CODE> - the namespace.</DL>
</DD>
</DL>
<HR>
<A NAME="addNamespace(java.lang.String, java.lang.String)"><!-- --></A><H3>
addNamespace</H3>
<PRE>
public void <B>addNamespace</B>(java.lang.String prefix,
java.lang.String uri)</PRE>
<DL>
<DD>Adds a namespace definition (prefix and URI) to the list of
namespaces known of this XPath expression.
<p>
<strong>Note</strong>: In XPath, there is no such thing as a
'default namespace'. The empty prefix <b>always</b> resolves
to the empty namespace URI.</p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>prefix</CODE> - the namespace prefix.<DD><CODE>uri</CODE> - the namespace URI.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/jdom/IllegalNameException.html" title="class in org.jdom">IllegalNameException</A></CODE> - if the prefix or uri are null or
empty strings or if they contain
illegal characters.</DL>
</DD>
</DL>
<HR>
<A NAME="getXPath()"><!-- --></A><H3>
getXPath</H3>
<PRE>
public abstract java.lang.String <B>getXPath</B>()</PRE>
<DL>
<DD>Returns the wrapped XPath expression as a string.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the wrapped XPath expression as a string.</DL>
</DD>
</DL>
<HR>
<A NAME="selectNodes(java.lang.Object, java.lang.String)"><!-- --></A><H3>
selectNodes</H3>
<PRE>
public static java.util.List <B>selectNodes</B>(java.lang.Object context,
java.lang.String path)
throws <A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></PRE>
<DL>
<DD>Evaluates an XPath expression and returns the list of selected
items.
<p>
<strong>Note</strong>: This method should not be used when the
same XPath expression needs to be applied several times (on the
same or different contexts) as it requires the expression to be
compiled before being evaluated. In such cases,
<A HREF="../../../org/jdom/xpath/XPath.html#newInstance(java.lang.String)"><CODE>allocating</CODE></A> an XPath wrapper instance and
<A HREF="../../../org/jdom/xpath/XPath.html#selectNodes(java.lang.Object)"><CODE>evaluating</CODE></A> it several
times is way more efficient.
</p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - the node to use as context for evaluating
the XPath expression.<DD><CODE>path</CODE> - the XPath expression to evaluate.
<DT><B>Returns:</B><DD>the list of selected items, which may be of types: <A HREF="../../../org/jdom/Element.html" title="class in org.jdom"><CODE>Element</CODE></A>,
<A HREF="../../../org/jdom/Attribute.html" title="class in org.jdom"><CODE>Attribute</CODE></A>, <A HREF="../../../org/jdom/Text.html" title="class in org.jdom"><CODE>Text</CODE></A>, <A HREF="../../../org/jdom/CDATA.html" title="class in org.jdom"><CODE>CDATA</CODE></A>,
<A HREF="../../../org/jdom/Comment.html" title="class in org.jdom"><CODE>Comment</CODE></A>, <A HREF="../../../org/jdom/ProcessingInstruction.html" title="class in org.jdom"><CODE>ProcessingInstruction</CODE></A>, Boolean,
Double, or String.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></CODE> - if the XPath expression is invalid or
its evaluation on the specified context
failed.</DL>
</DD>
</DL>
<HR>
<A NAME="selectSingleNode(java.lang.Object, java.lang.String)"><!-- --></A><H3>
selectSingleNode</H3>
<PRE>
public static java.lang.Object <B>selectSingleNode</B>(java.lang.Object context,
java.lang.String path)
throws <A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></PRE>
<DL>
<DD>Evaluates the wrapped XPath expression and returns the first
entry in the list of selected nodes (or atomics).
<p>
<strong>Note</strong>: This method should not be used when the
same XPath expression needs to be applied several times (on the
same or different contexts) as it requires the expression to be
compiled before being evaluated. In such cases,
<A HREF="../../../org/jdom/xpath/XPath.html#newInstance(java.lang.String)"><CODE>allocating</CODE></A> an XPath wrapper instance and
<A HREF="../../../org/jdom/xpath/XPath.html#selectSingleNode(java.lang.Object)"><CODE>evaluating</CODE></A> it
several times is way more efficient.
</p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - the element to use as context for evaluating
the XPath expression.<DD><CODE>path</CODE> - the XPath expression to evaluate.
<DT><B>Returns:</B><DD>the first selected item, which may be of types: <A HREF="../../../org/jdom/Element.html" title="class in org.jdom"><CODE>Element</CODE></A>,
<A HREF="../../../org/jdom/Attribute.html" title="class in org.jdom"><CODE>Attribute</CODE></A>, <A HREF="../../../org/jdom/Text.html" title="class in org.jdom"><CODE>Text</CODE></A>, <A HREF="../../../org/jdom/CDATA.html" title="class in org.jdom"><CODE>CDATA</CODE></A>,
<A HREF="../../../org/jdom/Comment.html" title="class in org.jdom"><CODE>Comment</CODE></A>, <A HREF="../../../org/jdom/ProcessingInstruction.html" title="class in org.jdom"><CODE>ProcessingInstruction</CODE></A>, Boolean,
Double, String, or <code>null</code> if no item was selected.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/jdom/JDOMException.html" title="class in org.jdom">JDOMException</A></CODE> - if the XPath expression is invalid or
its evaluation on the specified context
failed.</DL>
</DD>
</DL>
<HR>
<A NAME="writeReplace()"><!-- --></A><H3>
writeReplace</H3>
<PRE>
protected final java.lang.Object <B>writeReplace</B>()
throws java.io.ObjectStreamException</PRE>
<DL>
<DD><i>[Serialization support]</i> Returns the alternative object
to write to the stream when serializing this object. This
method returns an instance of a dedicated nested class to
serialize XPath expressions independently of the concrete
implementation being used.
<p>
<strong>Note</strong>: Subclasses are not allowed to override
this method to ensure valid serialization of all
implementations.</p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an XPathString instance configured with the wrapped
XPath expression.
<DT><B>Throws:</B>
<DD><CODE>java.io.ObjectStreamException</CODE> - never.</DL>
</DD>
</DL>
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