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XPathExpressionImpl
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net.sf.saxon.xpath</FONT>
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Class XPathExpressionImpl</H2>
<PRE>
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>net.sf.saxon.xpath.XPathExpressionImpl</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpression.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpression</A>, <A HREF="../../../../net/sf/saxon/expr/sort/SortKeyEvaluator.html" title="interface in net.sf.saxon.expr.sort">SortKeyEvaluator</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>XPathExpressionImpl</B><DT>extends <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpression.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpression</A>, <A HREF="../../../../net/sf/saxon/expr/sort/SortKeyEvaluator.html" title="interface in net.sf.saxon.expr.sort">SortKeyEvaluator</A></DL>
</PRE>
<P>
<p>The JAXP XPathExpression interface represents a compiled XPath expression that can be repeatedly
evaluated. This class is Saxon's implementation of that interface.</p>
<p>The class also includes some methods retained from Saxon's original XPath API. When these methods
are used, the object contains the context node and other state, so it is not thread-safe.</p>
<P>
<P>
<DL>
<DT><B>Author:</B></DT>
<DD>Michael H. Kay</DD>
</DL>
<HR>
<P>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected </CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#XPathExpressionImpl(net.sf.saxon.expr.Expression, net.sf.saxon.expr.instruct.Executable)">XPathExpressionImpl</A></B>(<A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> exp,
<A HREF="../../../../net/sf/saxon/expr/instruct/Executable.html" title="class in net.sf.saxon.expr.instruct">Executable</A> exec)</CODE>
<BR>
The constructor is protected, to ensure that instances can only be
created using the createExpression() method of XPathEvaluator</TD>
</TR>
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<!-- ========== METHOD SUMMARY =========== -->
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<B>Method Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate()">evaluate</A></B>()</CODE>
<BR>
<B>Deprecated.</B> <I>since 9.0. This method is not present in the JAXP interface. Either use
the JAXP methods such as <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(java.lang.Object, javax.xml.namespace.QName)"><CODE>evaluate(Object, QName)</CODE></A>, or use the Saxon XPath
API instead of JAXP.</I></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(org.xml.sax.InputSource)">evaluate</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/org/xml/sax/InputSource.html?is-external=true" title="class or interface in org.xml.sax">InputSource</A> inputSource)</CODE>
<BR>
Evaluate the XPath expression against an input source to obtain a string result</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(org.xml.sax.InputSource, javax.xml.namespace.QName)">evaluate</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/org/xml/sax/InputSource.html?is-external=true" title="class or interface in org.xml.sax">InputSource</A> inputSource,
<A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/namespace/QName.html?is-external=true" title="class or interface in javax.xml.namespace">QName</A> qName)</CODE>
<BR>
Evaluate the XPath expression against an input source to obtain a result of a specified type</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(java.lang.Object)">evaluate</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> node)</CODE>
<BR>
Evaluate the expression to return a string value</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(java.lang.Object, javax.xml.namespace.QName)">evaluate</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> node,
<A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/namespace/QName.html?is-external=true" title="class or interface in javax.xml.namespace">QName</A> qName)</CODE>
<BR>
JAXP 1.3 evaluate() method</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluateSingle()">evaluateSingle</A></B>()</CODE>
<BR>
<B>Deprecated.</B> <I>since 9.0. This method is not present in the JAXP interface. Either use
the JAXP methods such as <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(java.lang.Object, javax.xml.namespace.QName)"><CODE>evaluate(Object, QName)</CODE></A>, or use the Saxon XPath
API instead of JAXP.</I></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluateSortKey(int, net.sf.saxon.expr.XPathContext)">evaluateSortKey</A></B>(int n,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> c)</CODE>
<BR>
Callback for evaluating the sort keys.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/Configuration.html" title="class in net.sf.saxon">Configuration</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#getConfiguration()">getConfiguration</A></B>()</CODE>
<BR>
Get the Configuration under which this XPath expression was compiled</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#getInternalExpression()">getInternalExpression</A></B>()</CODE>
<BR>
Low-level method to get the internal Saxon expression object.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/expr/instruct/SlotManager.html" title="class in net.sf.saxon.expr.instruct">SlotManager</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#getStackFrameMap()">getStackFrameMap</A></B>()</CODE>
<BR>
Get the stack frame map.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#privatelySetContextNode(net.sf.saxon.om.NodeInfo)">privatelySetContextNode</A></B>(<A HREF="../../../../net/sf/saxon/om/NodeInfo.html" title="interface in net.sf.saxon.om">NodeInfo</A> node)</CODE>
<BR>
Protected, undeprecated version of setContextNode() for use by deprecated paths within the package
(exists to avoid deprecation warnings when compiling Saxon)</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#rawIterator(net.sf.saxon.om.Item)">rawIterator</A></B>(<A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> contextItem)</CODE>
<BR>
Get a raw iterator over the results of the 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="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#setContextNode(net.sf.saxon.om.NodeInfo)">setContextNode</A></B>(<A HREF="../../../../net/sf/saxon/om/NodeInfo.html" title="interface in net.sf.saxon.om">NodeInfo</A> node)</CODE>
<BR>
<B>Deprecated.</B> <I>since 9.0. Using this method is not thread-safe. Use a method instead
such as <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(java.lang.Object, javax.xml.namespace.QName)"><CODE>evaluate(Object, QName)</CODE></A> that allows the context node to be specified
as a parameter to the call.</I></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="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#setSortKey(net.sf.saxon.xpath.XPathExpressionImpl)">setSortKey</A></B>(<A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html" title="class in net.sf.saxon.xpath">XPathExpressionImpl</A> sortKey)</CODE>
<BR>
<B>Deprecated.</B> <I>since 9.0. This method is not present in the JAXP interface. The recommended
way to get a sorted result is to use XQuery instead of XPath.</I></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#setStackFrameMap(net.sf.saxon.expr.instruct.SlotManager)">setStackFrameMap</A></B>(<A HREF="../../../../net/sf/saxon/expr/instruct/SlotManager.html" title="class in net.sf.saxon.expr.instruct">SlotManager</A> map)</CODE>
<BR>
Define the number of slots needed for local variables within the expression.</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.<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
</TR>
</TABLE>
<P>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_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>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="XPathExpressionImpl(net.sf.saxon.expr.Expression, net.sf.saxon.expr.instruct.Executable)"><!-- --></A><H3>
XPathExpressionImpl</H3>
<PRE>
protected <B>XPathExpressionImpl</B>(<A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> exp,
<A HREF="../../../../net/sf/saxon/expr/instruct/Executable.html" title="class in net.sf.saxon.expr.instruct">Executable</A> exec)</PRE>
<DL>
<DD>The constructor is protected, to ensure that instances can only be
created using the createExpression() method of XPathEvaluator
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>exp</CODE> - the compiled expression<DD><CODE>exec</CODE> - the executable</DL>
</DL>
<!-- ============ 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="setStackFrameMap(net.sf.saxon.expr.instruct.SlotManager)"><!-- --></A><H3>
setStackFrameMap</H3>
<PRE>
protected void <B>setStackFrameMap</B>(<A HREF="../../../../net/sf/saxon/expr/instruct/SlotManager.html" title="class in net.sf.saxon.expr.instruct">SlotManager</A> map)</PRE>
<DL>
<DD>Define the number of slots needed for local variables within the expression.
This method is for internal use only.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>map</CODE> - description of the stack frame</DL>
</DD>
</DL>
<HR>
<A NAME="getStackFrameMap()"><!-- --></A><H3>
getStackFrameMap</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/expr/instruct/SlotManager.html" title="class in net.sf.saxon.expr.instruct">SlotManager</A> <B>getStackFrameMap</B>()</PRE>
<DL>
<DD>Get the stack frame map. This holds information about the allocation of slots to variables.
This is needed by applications using low-level interfaces for evaluating the expression
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a description of the stack frame</DL>
</DD>
</DL>
<HR>
<A NAME="getConfiguration()"><!-- --></A><H3>
getConfiguration</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/Configuration.html" title="class in net.sf.saxon">Configuration</A> <B>getConfiguration</B>()</PRE>
<DL>
<DD>Get the Configuration under which this XPath expression was compiled
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the Saxon configuration</DL>
</DD>
</DL>
<HR>
<A NAME="setSortKey(net.sf.saxon.xpath.XPathExpressionImpl)"><!-- --></A><H3>
setSortKey</H3>
<PRE>
public void <B>setSortKey</B>(<A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html" title="class in net.sf.saxon.xpath">XPathExpressionImpl</A> sortKey)</PRE>
<DL>
<DD><B>Deprecated.</B> <I>since 9.0. This method is not present in the JAXP interface. The recommended
way to get a sorted result is to use XQuery instead of XPath.</I>
<P>
<DD>Define the sort order for the results of the expression. If this method is called, then
the list returned by a subsequent call on the evaluate() method will first be sorted.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>sortKey</CODE> - an XPathExpression, which will be applied to each item in the sequence;
the result of this expression determines the ordering of the list returned by the evaluate()
method. The sortKey can be null, to clear a previous sort key. Note that the expression is
not automatically atomized; if it selects nodes, these should be explicitly converted to
atomic values by calling the string() or data() functions.</DL>
</DD>
</DL>
<HR>
<A NAME="setContextNode(net.sf.saxon.om.NodeInfo)"><!-- --></A><H3>
setContextNode</H3>
<PRE>
public void <B>setContextNode</B>(<A HREF="../../../../net/sf/saxon/om/NodeInfo.html" title="interface in net.sf.saxon.om">NodeInfo</A> node)</PRE>
<DL>
<DD><B>Deprecated.</B> <I>since 9.0. Using this method is not thread-safe. Use a method instead
such as <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(java.lang.Object, javax.xml.namespace.QName)"><CODE>evaluate(Object, QName)</CODE></A> that allows the context node to be specified
as a parameter to the call.</I>
<P>
<DD>Set the context node for evaluating the expression. If this method is not called,
the context node will be the root of the document to which the prepared expression is
bound.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>node</CODE> - the context node</DL>
</DD>
</DL>
<HR>
<A NAME="privatelySetContextNode(net.sf.saxon.om.NodeInfo)"><!-- --></A><H3>
privatelySetContextNode</H3>
<PRE>
protected void <B>privatelySetContextNode</B>(<A HREF="../../../../net/sf/saxon/om/NodeInfo.html" title="interface in net.sf.saxon.om">NodeInfo</A> node)</PRE>
<DL>
<DD>Protected, undeprecated version of setContextNode() for use by deprecated paths within the package
(exists to avoid deprecation warnings when compiling Saxon)
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>node</CODE> - the context node</DL>
</DD>
</DL>
<HR>
<A NAME="evaluate()"><!-- --></A><H3>
evaluate</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A> <B>evaluate</B>()
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD><B>Deprecated.</B> <I>since 9.0. This method is not present in the JAXP interface. Either use
the JAXP methods such as <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(java.lang.Object, javax.xml.namespace.QName)"><CODE>evaluate(Object, QName)</CODE></A>, or use the Saxon XPath
API instead of JAXP.</I>
<P>
<DD>Execute a prepared XPath expression, returning the results as a List. The context
node must have been set previously using <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#setContextNode(net.sf.saxon.om.NodeInfo)"><CODE>setContextNode(net.sf.saxon.om.NodeInfo)</CODE></A>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The results of the expression, as a List. The List represents the sequence
of items returned by the expression. Each item in the list will either be an instance
of net.sf.saxon.om.NodeInfo, representing a node, or a Java object representing an atomic value.
For the types of Java object that may be returned, see <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(java.lang.Object, javax.xml.namespace.QName)"><CODE>evaluate(Object, javax.xml.namespace.QName)</CODE></A>
with the second argument set to NODESET.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="evaluateSingle()"><!-- --></A><H3>
evaluateSingle</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>evaluateSingle</B>()
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD><B>Deprecated.</B> <I>since 9.0. This method is not present in the JAXP interface. Either use
the JAXP methods such as <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(java.lang.Object, javax.xml.namespace.QName)"><CODE>evaluate(Object, QName)</CODE></A>, or use the Saxon XPath
API instead of JAXP.</I>
<P>
<DD>Execute a prepared XPath expression, returning the first item in the result.
This is useful where it is known that the expression will only return
a singleton value (for example, a single node, or a boolean). The context node
must be set previously using <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#setContextNode(net.sf.saxon.om.NodeInfo)"><CODE>setContextNode(net.sf.saxon.om.NodeInfo)</CODE></A>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The first item in the sequence returned by the expression. If the expression
returns an empty sequence, this method returns null. Otherwise, it returns the first
item in the result sequence, represented as a Java object using the same mapping as for
the evaluate() method
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="rawIterator(net.sf.saxon.om.Item)"><!-- --></A><H3>
rawIterator</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A> <B>rawIterator</B>(<A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> contextItem)
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Get a raw iterator over the results of the expression. This returns results without
any conversion of the returned items to "native" Java classes. This method is intended
for use by applications that need to process the results of the expression using
internal Saxon interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>contextItem</CODE> - the context item for evaluating the expression
<DT><B>Returns:</B><DD>an iterator over the results of the expression, with no conversion of returned items
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE><DT><B>Since:</B></DT>
<DD>9.0</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="evaluate(java.lang.Object, javax.xml.namespace.QName)"><!-- --></A><H3>
evaluate</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>evaluate</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> node,
<A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/namespace/QName.html?is-external=true" title="class or interface in javax.xml.namespace">QName</A> qName)
throws <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpressionException.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpressionException</A></PRE>
<DL>
<DD>JAXP 1.3 evaluate() method
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpression.html?is-external=true#evaluate(java.lang.Object, javax.xml.namespace.QName)" title="class or interface in javax.xml.xpath">evaluate</A></CODE> in interface <CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpression.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>node</CODE> - The context node. This must use a representation of nodes that this implementation understands.
This may be a Saxon NodeInfo, or a node in one of the external object models supported, for example
DOM, DOM4J, JDOM, or XOM, provided the support module for that object model is loaded.
<p><b>Contrary to the interface specification, Saxon does not supply an empty
document when the value is null. This is because Saxon supports multiple object models,
and it's unclear what kind of document node would be appropriate. Instead, Saxon uses
the node supplied to the <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#setContextNode(net.sf.saxon.om.NodeInfo)"><CODE>setContextNode(net.sf.saxon.om.NodeInfo)</CODE></A> method if available, and if none
is available, executes the XPath expression with the context item undefined.</p></p>
<p><b>Saxon does not allow a NodeList to be supplied for this parameter. It's not clear
what this would be intended to mean.</b></p><DD><CODE>qName</CODE> - Indicates the type of result required. This must be one of the constants defined in
the JAXP <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathConstants.html?is-external=true" title="class or interface in javax.xml.xpath"><CODE>XPathConstants</CODE></A> class.
Saxon will attempt to convert the actual result of the expression to the required type using the
XPath 1.0 conversion rules.
<DT><B>Returns:</B><DD>the result of the evaluation, as a Java object of the appropriate type. Saxon interprets the
rules as follows:
<table>
<thead><tr><td>QName</td><td>Return Value</td></thead>
<tbody>
<tr><td valign="top">BOOLEAN</td>
<td>The effective boolean value of the actual result,
as a Java Boolean object</td></tr>
<tr><td valign="top">STRING</td>
<td>The result of applying the string() function to the actual result,
as a Java String object</td></tr>
<tr><td valign="top">NUMBER</td>
<td>The result of applying the number() function to the actual result,
as a Java Double object</td></tr>
<tr><td valign="top">NODE</td>
<td>A single node, in the native data model supplied as input. If the
expression returns more than one node, the first is returned. If
the expression returns an empty sequence, null is returned. If the
expression returns an atomic value, or if the first item in the
result sequence is an atomic value, an exception is thrown.</td></tr>
<tr><td valign="top">NODESET</td>
<td>This is interpreted as allowing any sequence, of nodes or atomic values.
If the first argument is a wrapper around a DOM Node, then the result is
returned as a DOM NodeList, and an exception is then thrown if the result sequence
contains a value that is not a DOM Node. In all other cases
the result is returned as a Java List object, unless it is empty, in which
case null is returned. The contents of the list may be node objects (in the
native data model supplied as input), or Java objects representing the XPath
atomic values in the actual result: String for an xs:string, Double for a xs:double,
Long for an xs:integer, and so on. (For safety, cast the values to a type
such as xs:string within the XPath expression). </td></tr></table>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpressionException.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpressionException</A></CODE> - if evaluation of the expression fails or if the
result cannot be converted to the requested type.</DL>
</DD>
</DL>
<HR>
<A NAME="evaluate(java.lang.Object)"><!-- --></A><H3>
evaluate</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>evaluate</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> node)
throws <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpressionException.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpressionException</A></PRE>
<DL>
<DD>Evaluate the expression to return a string value
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpression.html?is-external=true#evaluate(java.lang.Object)" title="class or interface in javax.xml.xpath">evaluate</A></CODE> in interface <CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpression.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>node</CODE> - the initial context node. This must be either an instance of NodeInfo or a node
recognized by a known external object model.
<p><b>Contrary to the interface specification, Saxon does not supply an empty
document when the value is null. This is because Saxon supports multiple object models,
and it's unclear what kind of document node would be appropriate. Instead, Saxon uses
the node supplied to the <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#setContextNode(net.sf.saxon.om.NodeInfo)"><CODE>setContextNode(net.sf.saxon.om.NodeInfo)</CODE></A> method if available, and if none
is available, executes the XPath expression with the context item undefined.</p></p>
<DT><B>Returns:</B><DD>the results of the expression, converted to a String
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpressionException.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpressionException</A></CODE> - if evaluation fails</DL>
</DD>
</DL>
<HR>
<A NAME="evaluate(org.xml.sax.InputSource, javax.xml.namespace.QName)"><!-- --></A><H3>
evaluate</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>evaluate</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/org/xml/sax/InputSource.html?is-external=true" title="class or interface in org.xml.sax">InputSource</A> inputSource,
<A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/namespace/QName.html?is-external=true" title="class or interface in javax.xml.namespace">QName</A> qName)
throws <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpressionException.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpressionException</A></PRE>
<DL>
<DD>Evaluate the XPath expression against an input source to obtain a result of a specified type
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpression.html?is-external=true#evaluate(org.xml.sax.InputSource, javax.xml.namespace.QName)" title="class or interface in javax.xml.xpath">evaluate</A></CODE> in interface <CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpression.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>inputSource</CODE> - The input source document against which the expression is evaluated.
(Note that there is no caching. This will be parsed, and the parsed result will be discarded.)
If the supplied value is null then (contrary to the JAXP specifications), the XPath expression
is evaluated with the context item undefined.<DD><CODE>qName</CODE> - The type required, identified by a constant in <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathConstants.html?is-external=true" title="class or interface in javax.xml.xpath"><CODE>XPathConstants</CODE></A>
<DT><B>Returns:</B><DD>the result of the evaluation, as a Java object of the appropriate type:
see <A HREF="../../../../net/sf/saxon/xpath/XPathExpressionImpl.html#evaluate(java.lang.Object, javax.xml.namespace.QName)"><CODE>evaluate(Object, javax.xml.namespace.QName)</CODE></A>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpressionException.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpressionException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="evaluate(org.xml.sax.InputSource)"><!-- --></A><H3>
evaluate</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>evaluate</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/org/xml/sax/InputSource.html?is-external=true" title="class or interface in org.xml.sax">InputSource</A> inputSource)
throws <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpressionException.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpressionException</A></PRE>
<DL>
<DD>Evaluate the XPath expression against an input source to obtain a string result
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpression.html?is-external=true#evaluate(org.xml.sax.InputSource)" title="class or interface in javax.xml.xpath">evaluate</A></CODE> in interface <CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpression.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>inputSource</CODE> - The input source document against which the expression is evaluated.
(Note that there is no caching. This will be parsed, and the parsed result will be discarded.)
<DT><B>Returns:</B><DD>the result of the evaluation, converted to a String
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/xpath/XPathExpressionException.html?is-external=true" title="class or interface in javax.xml.xpath">XPathExpressionException</A></CODE> - in the event of an XPath dynamic error
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</A></CODE> - If <code>inputSource</code> is <code>null</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="evaluateSortKey(int, net.sf.saxon.expr.XPathContext)"><!-- --></A><H3>
evaluateSortKey</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/value/AtomicValue.html" title="class in net.sf.saxon.value">AtomicValue</A> <B>evaluateSortKey</B>(int n,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> c)
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Callback for evaluating the sort keys. For internal use only.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../net/sf/saxon/expr/sort/SortKeyEvaluator.html#evaluateSortKey(int, net.sf.saxon.expr.XPathContext)">evaluateSortKey</A></CODE> in interface <CODE><A HREF="../../../../net/sf/saxon/expr/sort/SortKeyEvaluator.html" title="interface in net.sf.saxon.expr.sort">SortKeyEvaluator</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="getInternalExpression()"><!-- --></A><H3>
getInternalExpression</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>getInternalExpression</B>()</PRE>
<DL>
<DD>Low-level method to get the internal Saxon expression object. This exposes a wide range of
internal methods that may be needed by specialized applications, and allows greater control
over the dynamic context for evaluating the expression.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the underlying Saxon expression object.</DL>
</DD>
</DL>
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