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XPathExecutable
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SUMMARY: NESTED | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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net.sf.saxon.s9api</FONT>
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Class XPathExecutable</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.s9api.XPathExecutable</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>XPathExecutable</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></DL>
</PRE>
<P>
An XPathExecutable represents the compiled form of an XPath expression.
To evaluate the expression, it must first be loaded to form an <A HREF="../../../../net/sf/saxon/s9api/XPathSelector.html" title="class in net.sf.saxon.s9api"><CODE>XPathSelector</CODE></A>.
<p>An XPathExecutable is immutable, and therefore thread-safe. It is simplest to load
a new XPathSelector each time the expression is to be evaluated. However, the XPathSelector
is serially reusable within a single thread.</p>
<p>An XPathExecutable is created by using the <A HREF="../../../../net/sf/saxon/s9api/XPathCompiler.html#compile(java.lang.String)"><CODE>XPathCompiler.compile(java.lang.String)</CODE></A> method
on the <A HREF="../../../../net/sf/saxon/s9api/XPathCompiler.html" title="class in net.sf.saxon.s9api"><CODE>XPathCompiler</CODE></A> class.</p>
<P>
<P>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<CODE>protected </CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/s9api/XPathExecutable.html#XPathExecutable(net.sf.saxon.sxpath.XPathExpression, net.sf.saxon.s9api.Processor, net.sf.saxon.sxpath.IndependentContext)">XPathExecutable</A></B>(<A HREF="../../../../net/sf/saxon/sxpath/XPathExpression.html" title="class in net.sf.saxon.sxpath">XPathExpression</A> exp,
<A HREF="../../../../net/sf/saxon/s9api/Processor.html" title="class in net.sf.saxon.s9api">Processor</A> processor,
<A HREF="../../../../net/sf/saxon/sxpath/IndependentContext.html" title="class in net.sf.saxon.sxpath">IndependentContext</A> env)</CODE>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/s9api/OccurrenceIndicator.html" title="enum in net.sf.saxon.s9api">OccurrenceIndicator</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/s9api/XPathExecutable.html#getRequiredCardinalityForVariable(net.sf.saxon.s9api.QName)">getRequiredCardinalityForVariable</A></B>(<A HREF="../../../../net/sf/saxon/s9api/QName.html" title="class in net.sf.saxon.s9api">QName</A> variableName)</CODE>
<BR>
Get the required cardinality of a declared variable in the static context of the expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/s9api/ItemType.html" title="class in net.sf.saxon.s9api">ItemType</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/s9api/XPathExecutable.html#getRequiredItemTypeForVariable(net.sf.saxon.s9api.QName)">getRequiredItemTypeForVariable</A></B>(<A HREF="../../../../net/sf/saxon/s9api/QName.html" title="class in net.sf.saxon.s9api">QName</A> variableName)</CODE>
<BR>
Get the required item type of a declared variable in the static context of the expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/s9api/OccurrenceIndicator.html" title="enum in net.sf.saxon.s9api">OccurrenceIndicator</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/s9api/XPathExecutable.html#getResultCardinality()">getResultCardinality</A></B>()</CODE>
<BR>
Get the statically-determined cardinality of the result of the expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/s9api/ItemType.html" title="class in net.sf.saxon.s9api">ItemType</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/s9api/XPathExecutable.html#getResultItemType()">getResultItemType</A></B>()</CODE>
<BR>
Get the ItemType of the items in the result of the expression, as determined by static analysis.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/sxpath/XPathExpression.html" title="class in net.sf.saxon.sxpath">XPathExpression</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/s9api/XPathExecutable.html#getUnderlyingExpression()">getUnderlyingExpression</A></B>()</CODE>
<BR>
Get the underlying implementation object representing the compiled XPath expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/s9api/XPathExecutable.html#getUnderlyingStaticContext()">getUnderlyingStaticContext</A></B>()</CODE>
<BR>
Get the underlying implementation object representing the static context of the compiled
XPath expression.</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/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A><<A HREF="../../../../net/sf/saxon/s9api/QName.html" title="class in net.sf.saxon.s9api">QName</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/s9api/XPathExecutable.html#iterateExternalVariables()">iterateExternalVariables</A></B>()</CODE>
<BR>
Get an iterator over the names of all the external variables.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/s9api/XPathSelector.html" title="class in net.sf.saxon.s9api">XPathSelector</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/s9api/XPathExecutable.html#load()">load</A></B>()</CODE>
<BR>
Load the compiled XPath expression to prepare it for execution.</TD>
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<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>
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<A NAME="XPathExecutable(net.sf.saxon.sxpath.XPathExpression, net.sf.saxon.s9api.Processor, net.sf.saxon.sxpath.IndependentContext)"><!-- --></A><H3>
XPathExecutable</H3>
<PRE>
protected <B>XPathExecutable</B>(<A HREF="../../../../net/sf/saxon/sxpath/XPathExpression.html" title="class in net.sf.saxon.sxpath">XPathExpression</A> exp,
<A HREF="../../../../net/sf/saxon/s9api/Processor.html" title="class in net.sf.saxon.s9api">Processor</A> processor,
<A HREF="../../../../net/sf/saxon/sxpath/IndependentContext.html" title="class in net.sf.saxon.sxpath">IndependentContext</A> env)</PRE>
<DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="load()"><!-- --></A><H3>
load</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/s9api/XPathSelector.html" title="class in net.sf.saxon.s9api">XPathSelector</A> <B>load</B>()</PRE>
<DL>
<DD>Load the compiled XPath expression to prepare it for execution.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>An XPathSelector. The returned XPathSelector can be used to set up the
dynamic context, and then to evaluate the expression.</DL>
</DD>
</DL>
<HR>
<A NAME="getResultItemType()"><!-- --></A><H3>
getResultItemType</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/s9api/ItemType.html" title="class in net.sf.saxon.s9api">ItemType</A> <B>getResultItemType</B>()</PRE>
<DL>
<DD>Get the ItemType of the items in the result of the expression, as determined by static analysis. This
is the most precise ItemType that the processor is able to determine from static examination of the
expression; the actual items in the expression result are guaranteed to belong to this ItemType or to a subtype
of this ItemType.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the statically-determined ItemType of the result of the expression<DT><B>Since:</B></DT>
<DD>9.1</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="getResultCardinality()"><!-- --></A><H3>
getResultCardinality</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/s9api/OccurrenceIndicator.html" title="enum in net.sf.saxon.s9api">OccurrenceIndicator</A> <B>getResultCardinality</B>()</PRE>
<DL>
<DD>Get the statically-determined cardinality of the result of the expression. This is the most precise cardinality
that the processor is able to determine from static examination of the expression.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the statically-determined cardinality of the result of the expression<DT><B>Since:</B></DT>
<DD>9.1</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="iterateExternalVariables()"><!-- --></A><H3>
iterateExternalVariables</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A><<A HREF="../../../../net/sf/saxon/s9api/QName.html" title="class in net.sf.saxon.s9api">QName</A>> <B>iterateExternalVariables</B>()</PRE>
<DL>
<DD>Get an iterator over the names of all the external variables. This includes both variables that have
been explicitly declared using a call to <tt>declareVariable()</tt>, and variables that are implicitly
declared by reference in the case where the <tt>allowUndeclaredVariables</tt> option is set. It does
not include range variables bound in a <tt>for</tt>, <tt>some</tt>, or <tt>every</tt> expression.
<p>If the <tt>allowUndeclaredVariables</tt> option is set, this method allows discovery of the variable
references that appear in the compiled expression.</p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>an iterator over the names of the external variables defined in the XPath expression<DT><B>Since:</B></DT>
<DD>9.2</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="getRequiredItemTypeForVariable(net.sf.saxon.s9api.QName)"><!-- --></A><H3>
getRequiredItemTypeForVariable</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/s9api/ItemType.html" title="class in net.sf.saxon.s9api">ItemType</A> <B>getRequiredItemTypeForVariable</B>(<A HREF="../../../../net/sf/saxon/s9api/QName.html" title="class in net.sf.saxon.s9api">QName</A> variableName)</PRE>
<DL>
<DD>Get the required item type of a declared variable in the static context of the expression.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>variableName</CODE> - the name of a declared variable
<DT><B>Returns:</B><DD>the required item type.
<p>If the variable was explicitly declared, this will be the item type that was set when the
variable was declared. If no item type was set, it will be <A HREF="../../../../net/sf/saxon/s9api/ItemType.html#ANY_ITEM"><CODE>ItemType.ANY_ITEM</CODE></A>.</p>
<p>If the variable was implicitly declared by reference (which can happen only when the
<tt>allowUndeclaredVariables</tt> option is set), the returned type will be <A HREF="../../../../net/sf/saxon/s9api/ItemType.html#ANY_ITEM"><CODE>ItemType.ANY_ITEM</CODE></A>.</p>
<p>If no variable with the specified QName has been declared either explicitly or implicitly,
the method returns null.</p><DT><B>Since:</B></DT>
<DD>9.2</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="getRequiredCardinalityForVariable(net.sf.saxon.s9api.QName)"><!-- --></A><H3>
getRequiredCardinalityForVariable</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/s9api/OccurrenceIndicator.html" title="enum in net.sf.saxon.s9api">OccurrenceIndicator</A> <B>getRequiredCardinalityForVariable</B>(<A HREF="../../../../net/sf/saxon/s9api/QName.html" title="class in net.sf.saxon.s9api">QName</A> variableName)</PRE>
<DL>
<DD>Get the required cardinality of a declared variable in the static context of the expression.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>variableName</CODE> - the name of a declared variable
<DT><B>Returns:</B><DD>the required cardinality.
<p>If the variable was explicitly declared, this will be the occurrence indicator that was set when the
variable was declared. If no item type was set, it will be <A HREF="../../../../net/sf/saxon/s9api/OccurrenceIndicator.html#ZERO_OR_MORE"><CODE>OccurrenceIndicator.ZERO_OR_MORE</CODE></A>.</p>
<p>If the variable was implicitly declared by reference (which can happen only when the
<tt>allowUndeclaredVariables</tt> option is set), the returned type will be
<A HREF="../../../../net/sf/saxon/s9api/OccurrenceIndicator.html#ZERO_OR_MORE"><CODE>OccurrenceIndicator.ZERO_OR_MORE</CODE></A>.</p>
<p>If no variable with the specified QName has been declared either explicitly or implicitly,
the method returns null.</p><DT><B>Since:</B></DT>
<DD>9.2</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="getUnderlyingExpression()"><!-- --></A><H3>
getUnderlyingExpression</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/sxpath/XPathExpression.html" title="class in net.sf.saxon.sxpath">XPathExpression</A> <B>getUnderlyingExpression</B>()</PRE>
<DL>
<DD>Get the underlying implementation object representing the compiled XPath expression.
This method provides access to lower-level Saxon classes and methods which may be subject to change
from one release to the next.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the underlying compiled XPath expression.</DL>
</DD>
</DL>
<HR>
<A NAME="getUnderlyingStaticContext()"><!-- --></A><H3>
getUnderlyingStaticContext</H3>
<PRE>
public <A HREF="../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A> <B>getUnderlyingStaticContext</B>()</PRE>
<DL>
<DD>Get the underlying implementation object representing the static context of the compiled
XPath expression. This method provides access to lower-level Saxon classes and methods which may be
subject to change from one release to the next.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the underlying static context.</DL>
</DD>
</DL>
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