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ExpressionVisitor
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net.sf.saxon.expr.parser</FONT>
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Class ExpressionVisitor</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.expr.parser.ExpressionVisitor</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html" title="interface in net.sf.saxon">TypeCheckerEnvironment</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>ExpressionVisitor</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="../../../../../net/sf/saxon/TypeCheckerEnvironment.html" title="interface in net.sf.saxon">TypeCheckerEnvironment</A></DL>
</PRE>
<P>
The ExpressionVisitor supports the various phases of processing of an expression tree which require
a recursive walk of the tree structure visiting each node in turn. In maintains a stack holding the
ancestor nodes of the node currently being visited.
<P>
<P>
<HR>
<P>
<!-- ======== NESTED CLASS SUMMARY ======== -->
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.ContextItemType.html" title="class in net.sf.saxon.expr.parser">ExpressionVisitor.ContextItemType</A></B></CODE>
<BR>
A data structure that represents the required type of the context item, together
with information about whether it is known to be present or absent or whether it
is not known statically whether it is present or absent.</TD>
</TR>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<B>Constructor Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html#ExpressionVisitor()">ExpressionVisitor</A></B>()</CODE>
<BR>
Create an ExpressionVisitor</TD>
</TR>
</TABLE>
<!-- ========== METHOD SUMMARY =========== -->
<A NAME="method_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<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="../../../../../net/sf/saxon/expr/CollationMap.html" title="class in net.sf.saxon.expr">CollationMap</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html#getCollationMap()">getCollationMap</A></B>()</CODE>
<BR>
</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/expr/parser/ExpressionVisitor.html#getConfiguration()">getConfiguration</A></B>()</CODE>
<BR>
Get the Saxon configuration</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/expr/parser/ExpressionVisitor.html#getCurrentExpression()">getCurrentExpression</A></B>()</CODE>
<BR>
Get the current expression, the one being visited</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/Executable.html" title="class in net.sf.saxon.expr.instruct">Executable</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html#getExecutable()">getExecutable</A></B>()</CODE>
<BR>
Get the Executable containing the expressions being visited</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/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<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/expr/parser/ExpressionVisitor.html#getExpressionStack()">getExpressionStack</A></B>()</CODE>
<BR>
Get the stack containing all the expressions currently being visited</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/expr/parser/ExpressionVisitor.html#getParentExpression()">getParentExpression</A></B>()</CODE>
<BR>
Get the parent expression of the current expression in the expression tree</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/expr/parser/ExpressionVisitor.html#getStaticContext()">getStaticContext</A></B>()</CODE>
<BR>
Get the static context for the expressions being visited.</TD>
</TR>
<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="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html#isLoopingReference(net.sf.saxon.expr.Binding, net.sf.saxon.expr.VariableReference)">isLoopingReference</A></B>(<A HREF="../../../../../net/sf/saxon/expr/Binding.html" title="interface in net.sf.saxon.expr">Binding</A> binding,
<A HREF="../../../../../net/sf/saxon/expr/VariableReference.html" title="class in net.sf.saxon.expr">VariableReference</A> ref)</CODE>
<BR>
</TD>
</TR>
<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="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html#isLoopingSubexpression(net.sf.saxon.expr.Expression)">isLoopingSubexpression</A></B>(<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> ancestor)</CODE>
<BR>
Return true if the current expression at the top of the visitor's stack is evaluated repeatedly
when a given ancestor expression is evaluated once</TD>
</TR>
<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="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html#isOptimizeForStreaming()">isOptimizeForStreaming</A></B>()</CODE>
<BR>
Ask whether the visitor is to optimize expressions for evaluation in a streaming environment</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/expr/parser/ExpressionVisitor.html#issueWarning(java.lang.String, javax.xml.transform.SourceLocator)">issueWarning</A></B>(<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> message,
<A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/transform/SourceLocator.html?is-external=true" title="class or interface in javax.xml.transform">SourceLocator</A> locator)</CODE>
<BR>
Issue a warning message</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html" title="class in net.sf.saxon.expr.parser">ExpressionVisitor</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html#make(net.sf.saxon.expr.StaticContext, net.sf.saxon.expr.instruct.Executable)">make</A></B>(<A HREF="../../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A> env,
<A HREF="../../../../../net/sf/saxon/expr/instruct/Executable.html" title="class in net.sf.saxon.expr.instruct">Executable</A> exec)</CODE>
<BR>
Factory method: make an expression visitor</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html#makeDynamicContext()">makeDynamicContext</A></B>()</CODE>
<BR>
Create a dynamic context suitable for early evaluation of constant subexpressions</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/expr/parser/ExpressionVisitor.html#optimize(net.sf.saxon.expr.Expression, net.sf.saxon.expr.parser.ExpressionVisitor.ContextItemType)">optimize</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/parser/ExpressionVisitor.ContextItemType.html" title="class in net.sf.saxon.expr.parser">ExpressionVisitor.ContextItemType</A> contextItemType)</CODE>
<BR>
Optimize an expression, via the ExpressionVisitor</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/expr/parser/ExpressionVisitor.html#resetStaticProperties()">resetStaticProperties</A></B>()</CODE>
<BR>
Reset the static properties for the current expression and for all its containing expressions.</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/expr/parser/ExpressionVisitor.html#setConfiguration(net.sf.saxon.Configuration)">setConfiguration</A></B>(<A HREF="../../../../../net/sf/saxon/Configuration.html" title="class in net.sf.saxon">Configuration</A> configuration)</CODE>
<BR>
Set the Saxon configuration</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/expr/parser/ExpressionVisitor.html#setExecutable(net.sf.saxon.expr.instruct.Executable)">setExecutable</A></B>(<A HREF="../../../../../net/sf/saxon/expr/instruct/Executable.html" title="class in net.sf.saxon.expr.instruct">Executable</A> executable)</CODE>
<BR>
Set the Executable containing the expressions being visited</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/expr/parser/ExpressionVisitor.html#setExpressionStack(java.util.Stack)">setExpressionStack</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>> expressionStack)</CODE>
<BR>
Set the stack used to hold the expressions being visited</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/expr/parser/ExpressionVisitor.html#setOptimizeForStreaming(boolean)">setOptimizeForStreaming</A></B>(boolean option)</CODE>
<BR>
Tell the visitor to optimize expressions for evaluation in a streaming environment</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/expr/parser/ExpressionVisitor.html#setStaticContext(net.sf.saxon.expr.StaticContext)">setStaticContext</A></B>(<A HREF="../../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A> staticContext)</CODE>
<BR>
Set the static context for the expressions being visited.</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/expr/parser/ExpressionVisitor.html#simplify(net.sf.saxon.expr.Expression)">simplify</A></B>(<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> exp)</CODE>
<BR>
Simplify an expression, via the ExpressionVisitor</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/expr/parser/ExpressionVisitor.html#typeCheck(net.sf.saxon.expr.Expression, net.sf.saxon.expr.parser.ExpressionVisitor.ContextItemType)">typeCheck</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/parser/ExpressionVisitor.ContextItemType.html" title="class in net.sf.saxon.expr.parser">ExpressionVisitor.ContextItemType</A> contextItemType)</CODE>
<BR>
Type check an expression, via the ExpressionVisitor</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="">
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="ExpressionVisitor()"><!-- --></A><H3>
ExpressionVisitor</H3>
<PRE>
public <B>ExpressionVisitor</B>()</PRE>
<DL>
<DD>Create an ExpressionVisitor
<P>
</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="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 Saxon configuration
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html#getConfiguration()">getConfiguration</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html" title="interface in net.sf.saxon">TypeCheckerEnvironment</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the Saxon configuration</DL>
</DD>
</DL>
<HR>
<A NAME="setConfiguration(net.sf.saxon.Configuration)"><!-- --></A><H3>
setConfiguration</H3>
<PRE>
public void <B>setConfiguration</B>(<A HREF="../../../../../net/sf/saxon/Configuration.html" title="class in net.sf.saxon">Configuration</A> configuration)</PRE>
<DL>
<DD>Set the Saxon configuration
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>configuration</CODE> - the Saxon configuration</DL>
</DD>
</DL>
<HR>
<A NAME="getExecutable()"><!-- --></A><H3>
getExecutable</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/instruct/Executable.html" title="class in net.sf.saxon.expr.instruct">Executable</A> <B>getExecutable</B>()</PRE>
<DL>
<DD>Get the Executable containing the expressions being visited
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the Executable</DL>
</DD>
</DL>
<HR>
<A NAME="setExecutable(net.sf.saxon.expr.instruct.Executable)"><!-- --></A><H3>
setExecutable</H3>
<PRE>
public void <B>setExecutable</B>(<A HREF="../../../../../net/sf/saxon/expr/instruct/Executable.html" title="class in net.sf.saxon.expr.instruct">Executable</A> executable)</PRE>
<DL>
<DD>Set the Executable containing the expressions being visited
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>executable</CODE> - the Executable</DL>
</DD>
</DL>
<HR>
<A NAME="getCollationMap()"><!-- --></A><H3>
getCollationMap</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/CollationMap.html" title="class in net.sf.saxon.expr">CollationMap</A> <B>getCollationMap</B>()</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html#getCollationMap()">getCollationMap</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html" title="interface in net.sf.saxon">TypeCheckerEnvironment</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getExpressionStack()"><!-- --></A><H3>
getExpressionStack</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>> <B>getExpressionStack</B>()</PRE>
<DL>
<DD>Get the stack containing all the expressions currently being visited
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the expression stack holding all the containing expressions of the current expression;
the objects on this Stack are instances of <A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr"><CODE>Expression</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="setExpressionStack(java.util.Stack)"><!-- --></A><H3>
setExpressionStack</H3>
<PRE>
public void <B>setExpressionStack</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>> expressionStack)</PRE>
<DL>
<DD>Set the stack used to hold the expressions being visited
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>expressionStack</CODE> - the expression stack</DL>
</DD>
</DL>
<HR>
<A NAME="getStaticContext()"><!-- --></A><H3>
getStaticContext</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A> <B>getStaticContext</B>()</PRE>
<DL>
<DD>Get the static context for the expressions being visited. Note: this may not reflect all changes
in static context (e.g. namespace context, base URI) applying to nested expressions
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the static context</DL>
</DD>
</DL>
<HR>
<A NAME="setStaticContext(net.sf.saxon.expr.StaticContext)"><!-- --></A><H3>
setStaticContext</H3>
<PRE>
public void <B>setStaticContext</B>(<A HREF="../../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A> staticContext)</PRE>
<DL>
<DD>Set the static context for the expressions being visited. Note: this may not reflect all changes
in static context (e.g. namespace context, base URI) applying to nested expressions
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>staticContext</CODE> - the static context</DL>
</DD>
</DL>
<HR>
<A NAME="getCurrentExpression()"><!-- --></A><H3>
getCurrentExpression</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>getCurrentExpression</B>()</PRE>
<DL>
<DD>Get the current expression, the one being visited
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the current expression</DL>
</DD>
</DL>
<HR>
<A NAME="make(net.sf.saxon.expr.StaticContext, net.sf.saxon.expr.instruct.Executable)"><!-- --></A><H3>
make</H3>
<PRE>
public static <A HREF="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html" title="class in net.sf.saxon.expr.parser">ExpressionVisitor</A> <B>make</B>(<A HREF="../../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A> env,
<A HREF="../../../../../net/sf/saxon/expr/instruct/Executable.html" title="class in net.sf.saxon.expr.instruct">Executable</A> exec)</PRE>
<DL>
<DD>Factory method: make an expression visitor
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>env</CODE> - the static context<DD><CODE>exec</CODE> - the executable
<DT><B>Returns:</B><DD>the new expression visitor</DL>
</DD>
</DL>
<HR>
<A NAME="issueWarning(java.lang.String, javax.xml.transform.SourceLocator)"><!-- --></A><H3>
issueWarning</H3>
<PRE>
public void <B>issueWarning</B>(<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> message,
<A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/transform/SourceLocator.html?is-external=true" title="class or interface in javax.xml.transform">SourceLocator</A> locator)</PRE>
<DL>
<DD>Issue a warning message
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html#issueWarning(java.lang.String, javax.xml.transform.SourceLocator)">issueWarning</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html" title="interface in net.sf.saxon">TypeCheckerEnvironment</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>message</CODE> - the message</DL>
</DD>
</DL>
<HR>
<A NAME="makeDynamicContext()"><!-- --></A><H3>
makeDynamicContext</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> <B>makeDynamicContext</B>()</PRE>
<DL>
<DD>Create a dynamic context suitable for early evaluation of constant subexpressions
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html#makeDynamicContext()">makeDynamicContext</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html" title="interface in net.sf.saxon">TypeCheckerEnvironment</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="simplify(net.sf.saxon.expr.Expression)"><!-- --></A><H3>
simplify</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>simplify</B>(<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> exp)
throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Simplify an expression, via the ExpressionVisitor
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html#simplify(net.sf.saxon.expr.Expression)">simplify</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html" title="interface in net.sf.saxon">TypeCheckerEnvironment</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>exp</CODE> - the expression to be simplified. Possibly null.
<DT><B>Returns:</B><DD>the simplified expression. Returns null if and only if the supplied expression is null.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if any error occurs</DL>
</DD>
</DL>
<HR>
<A NAME="typeCheck(net.sf.saxon.expr.Expression, net.sf.saxon.expr.parser.ExpressionVisitor.ContextItemType)"><!-- --></A><H3>
typeCheck</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>typeCheck</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/parser/ExpressionVisitor.ContextItemType.html" title="class in net.sf.saxon.expr.parser">ExpressionVisitor.ContextItemType</A> contextItemType)
throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Type check an expression, via the ExpressionVisitor
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html#typeCheck(net.sf.saxon.expr.Expression, net.sf.saxon.expr.parser.ExpressionVisitor.ContextItemType)">typeCheck</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/TypeCheckerEnvironment.html" title="interface in net.sf.saxon">TypeCheckerEnvironment</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>exp</CODE> - the expression to be typechecked<DD><CODE>contextItemType</CODE> - the static type of the context item for this expression. The argument can be
set to null to indicate that it is known that the context item will be absent.
<DT><B>Returns:</B><DD>the expression that results from type checking (this may be wrapped in expressions that
perform dynamic checking of the item type or cardinality, or that perform atomization or numeric
promotion)
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if static type checking fails, that is, if the expression cannot possibly
deliver a value of the required type</DL>
</DD>
</DL>
<HR>
<A NAME="setOptimizeForStreaming(boolean)"><!-- --></A><H3>
setOptimizeForStreaming</H3>
<PRE>
public void <B>setOptimizeForStreaming</B>(boolean option)</PRE>
<DL>
<DD>Tell the visitor to optimize expressions for evaluation in a streaming environment
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>option</CODE> - true if optimizing for streaming</DL>
</DD>
</DL>
<HR>
<A NAME="isOptimizeForStreaming()"><!-- --></A><H3>
isOptimizeForStreaming</H3>
<PRE>
public boolean <B>isOptimizeForStreaming</B>()</PRE>
<DL>
<DD>Ask whether the visitor is to optimize expressions for evaluation in a streaming environment
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true if optimizing for streaming</DL>
</DD>
</DL>
<HR>
<A NAME="optimize(net.sf.saxon.expr.Expression, net.sf.saxon.expr.parser.ExpressionVisitor.ContextItemType)"><!-- --></A><H3>
optimize</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>optimize</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/parser/ExpressionVisitor.ContextItemType.html" title="class in net.sf.saxon.expr.parser">ExpressionVisitor.ContextItemType</A> contextItemType)
throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Optimize an expression, via the ExpressionVisitor
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>exp</CODE> - the expression to be typechecked<DD><CODE>contextItemType</CODE> - the static type of the context item for this expression. Passing null indicates
that the context item will always be absent
<DT><B>Returns:</B><DD>the rewritten expression
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if a static error is found</DL>
</DD>
</DL>
<HR>
<A NAME="getParentExpression()"><!-- --></A><H3>
getParentExpression</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>getParentExpression</B>()</PRE>
<DL>
<DD>Get the parent expression of the current expression in the expression tree
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the parent of the current expression (or null if this is the root)</DL>
</DD>
</DL>
<HR>
<A NAME="isLoopingSubexpression(net.sf.saxon.expr.Expression)"><!-- --></A><H3>
isLoopingSubexpression</H3>
<PRE>
public boolean <B>isLoopingSubexpression</B>(<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> ancestor)</PRE>
<DL>
<DD>Return true if the current expression at the top of the visitor's stack is evaluated repeatedly
when a given ancestor expression is evaluated once
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>ancestor</CODE> - the ancestor expression. May be null, in which case the search goes all the way
to the base of the stack.
<DT><B>Returns:</B><DD>true if the current expression is evaluated repeatedly</DL>
</DD>
</DL>
<HR>
<A NAME="isLoopingReference(net.sf.saxon.expr.Binding, net.sf.saxon.expr.VariableReference)"><!-- --></A><H3>
isLoopingReference</H3>
<PRE>
public boolean <B>isLoopingReference</B>(<A HREF="../../../../../net/sf/saxon/expr/Binding.html" title="interface in net.sf.saxon.expr">Binding</A> binding,
<A HREF="../../../../../net/sf/saxon/expr/VariableReference.html" title="class in net.sf.saxon.expr">VariableReference</A> ref)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="resetStaticProperties()"><!-- --></A><H3>
resetStaticProperties</H3>
<PRE>
public final void <B>resetStaticProperties</B>()</PRE>
<DL>
<DD>Reset the static properties for the current expression and for all its containing expressions.
This should be done whenever the expression is changed in a way that might
affect the properties. It causes the properties to be recomputed next time they are needed.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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