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: Class SingletonExpression
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com.icl.saxon.expr</FONT>
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Class SingletonExpression</H2>
<PRE>
java.lang.Object
|
+--<A HREF="../../../../com/icl/saxon/expr/Expression.html">com.icl.saxon.expr.Expression</A>
|
+--<A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html">com.icl.saxon.expr.NodeSetExpression</A>
|
+--<B>com.icl.saxon.expr.SingletonExpression</B>
</PRE>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../com/icl/saxon/expr/ContextNodeExpression.html">ContextNodeExpression</A>, <A HREF="../../../../com/icl/saxon/expr/ParentNodeExpression.html">ParentNodeExpression</A>, <A HREF="../../../../com/icl/saxon/expr/RootExpression.html">RootExpression</A></DD>
</DL>
<HR>
<DL>
<DT>public abstract class <B>SingletonExpression</B><DT>extends <A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html">NodeSetExpression</A></DL>
<P>
A node set expression that will always return zero or one nodes
<P>
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<TD><B>Fields inherited from class com.icl.saxon.expr.<A HREF="../../../../com/icl/saxon/expr/Expression.html">Expression</A></B></TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#staticContext">staticContext</A></CODE></TD>
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<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#SingletonExpression()">SingletonExpression</A></B>()</CODE>
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<B>Method Summary</B></FONT></TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/icl/saxon/om/NodeEnumeration.html">NodeEnumeration</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#enumerate(com.icl.saxon.Context, boolean)">enumerate</A></B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context,
boolean sort)</CODE>
<BR>
Evaluate the expression in a given context to return a Node enumeration</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#evaluateAsBoolean(com.icl.saxon.Context)">evaluateAsBoolean</A></B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)</CODE>
<BR>
Evaluate as a boolean.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/icl/saxon/expr/NodeSetValue.html">NodeSetValue</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#evaluateAsNodeSet(com.icl.saxon.Context)">evaluateAsNodeSet</A></B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)</CODE>
<BR>
Evaluate an expression as a NodeSet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#evaluateAsString(com.icl.saxon.Context)">evaluateAsString</A></B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)</CODE>
<BR>
Evaluate as a string.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract <A HREF="../../../../com/icl/saxon/om/NodeInfo.html">NodeInfo</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#getNode(com.icl.saxon.Context)">getNode</A></B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)</CODE>
<BR>
Get the single node to which this expression refers</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#isContextDocumentNodeSet()">isContextDocumentNodeSet</A></B>()</CODE>
<BR>
Determine, in the case of an expression whose data type is Value.NODESET,
whether all the nodes in the node-set are guaranteed to come from the same
document as the context node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/icl/saxon/om/NodeInfo.html">NodeInfo</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#selectFirst(com.icl.saxon.Context)">selectFirst</A></B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)</CODE>
<BR>
Return the first node selected by this Expression when evaluated in the current context</TD>
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</TABLE>
<A NAME="methods_inherited_from_class_com.icl.saxon.expr.NodeSetExpression"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class com.icl.saxon.expr.<A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html">NodeSetExpression</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#evaluate(com.icl.saxon.Context)">evaluate</A>, <A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#getDataType()">getDataType</A>, <A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#outputStringValue(com.icl.saxon.output.Outputter, com.icl.saxon.Context)">outputStringValue</A></CODE></TD>
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<A NAME="methods_inherited_from_class_com.icl.saxon.expr.Expression"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class com.icl.saxon.expr.<A HREF="../../../../com/icl/saxon/expr/Expression.html">Expression</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#containsReferences()">containsReferences</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#display(int)">display</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#evaluateAsNumber(com.icl.saxon.Context)">evaluateAsNumber</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#getDependencies()">getDependencies</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#getStaticContext()">getStaticContext</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#indent(int)">indent</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#make(java.lang.String, com.icl.saxon.expr.StaticContext)">make</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#reduce(int, com.icl.saxon.Context)">reduce</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#setStaticContext(com.icl.saxon.expr.StaticContext)">setStaticContext</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#simplify()">simplify</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#usesCurrent()">usesCurrent</A></CODE></TD>
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<TD><B>Methods inherited from class java.lang.Object</B></TD>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="SingletonExpression()"><!-- --></A><H3>
SingletonExpression</H3>
<PRE>
public <B>SingletonExpression</B>()</PRE>
<DL>
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<A NAME="isContextDocumentNodeSet()"><!-- --></A><H3>
isContextDocumentNodeSet</H3>
<PRE>
public boolean <B>isContextDocumentNodeSet</B>()</PRE>
<DL>
<DD>Determine, in the case of an expression whose data type is Value.NODESET,
whether all the nodes in the node-set are guaranteed to come from the same
document as the context node. Used for optimization.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#isContextDocumentNodeSet()">isContextDocumentNodeSet</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html">Expression</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="getNode(com.icl.saxon.Context)"><!-- --></A><H3>
getNode</H3>
<PRE>
public abstract <A HREF="../../../../com/icl/saxon/om/NodeInfo.html">NodeInfo</A> <B>getNode</B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)
throws <A HREF="../../../../com/icl/saxon/expr/XPathException.html">XPathException</A></PRE>
<DL>
<DD>Get the single node to which this expression refers</DL>
<HR>
<A NAME="selectFirst(com.icl.saxon.Context)"><!-- --></A><H3>
selectFirst</H3>
<PRE>
public <A HREF="../../../../com/icl/saxon/om/NodeInfo.html">NodeInfo</A> <B>selectFirst</B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)
throws <A HREF="../../../../com/icl/saxon/expr/XPathException.html">XPathException</A></PRE>
<DL>
<DD>Return the first node selected by this Expression when evaluated in the current context<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#selectFirst(com.icl.saxon.Context)">selectFirst</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html">NodeSetExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The context for the evaluation<DT><B>Returns:</B><DD>the NodeInfo of the first node in document order, or null if the node-set
is empty.</DL>
</DD>
</DL>
<HR>
<A NAME="enumerate(com.icl.saxon.Context, boolean)"><!-- --></A><H3>
enumerate</H3>
<PRE>
public <A HREF="../../../../com/icl/saxon/om/NodeEnumeration.html">NodeEnumeration</A> <B>enumerate</B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context,
boolean sort)
throws <A HREF="../../../../com/icl/saxon/expr/XPathException.html">XPathException</A></PRE>
<DL>
<DD>Evaluate the expression in a given context to return a Node enumeration<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#enumerate(com.icl.saxon.Context, boolean)">enumerate</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html">NodeSetExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - the evaluation context<DD><CODE>sort</CODE> - Indicates result must be in document order</DL>
</DD>
</DL>
<HR>
<A NAME="evaluateAsNodeSet(com.icl.saxon.Context)"><!-- --></A><H3>
evaluateAsNodeSet</H3>
<PRE>
public <A HREF="../../../../com/icl/saxon/expr/NodeSetValue.html">NodeSetValue</A> <B>evaluateAsNodeSet</B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)
throws <A HREF="../../../../com/icl/saxon/expr/XPathException.html">XPathException</A></PRE>
<DL>
<DD>Evaluate an expression as a NodeSet.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#evaluateAsNodeSet(com.icl.saxon.Context)">evaluateAsNodeSet</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html">NodeSetExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The context in which the expression is to be evaluated<DT><B>Returns:</B><DD>the value of the expression, evaluated in the current context</DL>
</DD>
</DL>
<HR>
<A NAME="evaluateAsString(com.icl.saxon.Context)"><!-- --></A><H3>
evaluateAsString</H3>
<PRE>
public java.lang.String <B>evaluateAsString</B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)
throws <A HREF="../../../../com/icl/saxon/expr/XPathException.html">XPathException</A></PRE>
<DL>
<DD>Evaluate as a string. Returns the string value of the node if it exists<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#evaluateAsString(com.icl.saxon.Context)">evaluateAsString</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html">NodeSetExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The context in which the expression is to be evaluated<DT><B>Returns:</B><DD>true if there are any nodes selected by the NodeSetExpression</DL>
</DD>
</DL>
<HR>
<A NAME="evaluateAsBoolean(com.icl.saxon.Context)"><!-- --></A><H3>
evaluateAsBoolean</H3>
<PRE>
public boolean <B>evaluateAsBoolean</B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)
throws <A HREF="../../../../com/icl/saxon/expr/XPathException.html">XPathException</A></PRE>
<DL>
<DD>Evaluate as a boolean. Returns true if there are any nodes
selected by the NodeSetExpression<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html#evaluateAsBoolean(com.icl.saxon.Context)">evaluateAsBoolean</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/NodeSetExpression.html">NodeSetExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The context in which the expression is to be evaluated<DT><B>Returns:</B><DD>true if there are any nodes selected by the NodeSetExpression</DL>
</DD>
</DL>
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