<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"> <!--NewPage--> <HTML> <HEAD> <!-- Generated by javadoc on Tue Sep 18 10:25:38 GMT+01:00 2001 --> <TITLE> : Class RootExpression </TITLE> <LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"> </HEAD> <BODY BGCOLOR="white"> <!-- ========== START OF NAVBAR ========== --> <A NAME="navbar_top"><!-- --></A> <TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"> <TR> <TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A NAME="navbar_top_firstrow"><!-- --></A> <TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" 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SIZE="-2"> <A HREF="../../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="RootExpression.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD> </TR> <TR> <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | <A HREF="#fields_inherited_from_class_com.icl.saxon.expr.Expression">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD> <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD> </TR> </TABLE> <!-- =========== END OF NAVBAR =========== --> <HR> <!-- ======== START OF CLASS DATA ======== --> <H2> <FONT SIZE="-1"> com.icl.saxon.expr</FONT> <BR> Class RootExpression</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> | +--<A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html">com.icl.saxon.expr.SingletonExpression</A> | +--<B>com.icl.saxon.expr.RootExpression</B> </PRE> <HR> <DL> <DT>public class <B>RootExpression</B><DT>extends <A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html">SingletonExpression</A></DL> <P> An expression whose value is always a set of nodes containing a single node, the document root. <P> <HR> <P> <!-- ======== INNER CLASS SUMMARY ======== --> <!-- =========== FIELD SUMMARY =========== --> <A NAME="fields_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>Fields 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#staticContext">staticContext</A></CODE></TD> </TR> </TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --> <A NAME="constructor_summary"><!-- --></A> <TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"> <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> <TD COLSPAN=2><FONT SIZE="+2"> <B>Constructor Summary</B></FONT></TD> </TR> <TR BGCOLOR="white" CLASS="TableRowColor"> <TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/RootExpression.html#RootExpression()">RootExpression</A></B>()</CODE> <BR> </TD> </TR> </TABLE> <!-- ========== METHOD SUMMARY =========== --> <A NAME="method_summary"><!-- --></A> <TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"> <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> <TD COLSPAN=2><FONT SIZE="+2"> <B>Method Summary</B></FONT></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="../../../../com/icl/saxon/expr/RootExpression.html#display(int)">display</A></B>(int level)</CODE> <BR> Diagnostic print of expression structure</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="../../../../com/icl/saxon/expr/RootExpression.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> </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/RootExpression.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> int</CODE></FONT></TD> <TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/RootExpression.html#getDependencies()">getDependencies</A></B>()</CODE> <BR> Determine which aspects of the context the expression depends on.</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/RootExpression.html#getNode(com.icl.saxon.Context)">getNode</A></B>(<A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)</CODE> <BR> Return the first element selected by this Expression</TD> </TR> <TR BGCOLOR="white" CLASS="TableRowColor"> <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> <CODE> <A HREF="../../../../com/icl/saxon/expr/Expression.html">Expression</A></CODE></FONT></TD> <TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/RootExpression.html#reduce(int, com.icl.saxon.Context)">reduce</A></B>(int dependencies, <A HREF="../../../../com/icl/saxon/Context.html">Context</A> context)</CODE> <BR> Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.</TD> </TR> <TR BGCOLOR="white" CLASS="TableRowColor"> <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> <CODE> <A HREF="../../../../com/icl/saxon/expr/Expression.html">Expression</A></CODE></FONT></TD> <TD><CODE><B><A HREF="../../../../com/icl/saxon/expr/RootExpression.html#simplify()">simplify</A></B>()</CODE> <BR> Simplify an expression</TD> </TR> </TABLE> <A NAME="methods_inherited_from_class_com.icl.saxon.expr.SingletonExpression"><!-- --></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/SingletonExpression.html">SingletonExpression</A></B></TD> </TR> <TR BGCOLOR="white" CLASS="TableRowColor"> <TD><CODE><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#enumerate(com.icl.saxon.Context, boolean)">enumerate</A>, <A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#evaluateAsNodeSet(com.icl.saxon.Context)">evaluateAsNodeSet</A>, <A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#isContextDocumentNodeSet()">isContextDocumentNodeSet</A>, <A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#selectFirst(com.icl.saxon.Context)">selectFirst</A></CODE></TD> </TR> </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> </TR> </TABLE> <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#evaluateAsNumber(com.icl.saxon.Context)">evaluateAsNumber</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#setStaticContext(com.icl.saxon.expr.StaticContext)">setStaticContext</A>, <A HREF="../../../../com/icl/saxon/expr/Expression.html#usesCurrent()">usesCurrent</A></CODE></TD> </TR> </TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A> <TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"> <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> <TD><B>Methods inherited from class java.lang.Object</B></TD> </TR> <TR BGCOLOR="white" CLASS="TableRowColor"> <TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD> </TR> </TABLE> <P> <!-- ============ FIELD DETAIL =========== --> <!-- ========= CONSTRUCTOR DETAIL ======== --> <A NAME="constructor_detail"><!-- --></A> <TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"> <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> <TD COLSPAN=1><FONT SIZE="+2"> <B>Constructor Detail</B></FONT></TD> </TR> </TABLE> <A NAME="RootExpression()"><!-- --></A><H3> RootExpression</H3> <PRE> public <B>RootExpression</B>()</PRE> <DL> </DL> <!-- ============ METHOD DETAIL ========== --> <A NAME="method_detail"><!-- --></A> <TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"> <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> <TD COLSPAN=1><FONT SIZE="+2"> <B>Method Detail</B></FONT></TD> </TR> </TABLE> <A NAME="simplify()"><!-- --></A><H3> simplify</H3> <PRE> public <A HREF="../../../../com/icl/saxon/expr/Expression.html">Expression</A> <B>simplify</B>() throws <A HREF="../../../../com/icl/saxon/expr/XPathException.html">XPathException</A></PRE> <DL> <DD>Simplify an expression<DD><DL> <DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#simplify()">simplify</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html">Expression</A></CODE></DL> </DD> <DD><DL> <DT><B>Returns:</B><DD>the simplified expression</DL> </DD> </DL> <HR> <A NAME="getNode(com.icl.saxon.Context)"><!-- --></A><H3> getNode</H3> <PRE> public <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>Return the first element selected by this Expression<DD><DL> <DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#getNode(com.icl.saxon.Context)">getNode</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html">SingletonExpression</A></CODE></DL> </DD> <DD><DL> <DT><B>Parameters:</B><DD><CODE>context</CODE> - The evaluation context<DT><B>Returns:</B><DD>the NodeInfo of the first selected element, or null if no element is selected</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<DD><DL> <DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#evaluateAsString(com.icl.saxon.Context)">evaluateAsString</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html">SingletonExpression</A></CODE></DL> </DD> <DD><DL> <DT><B>Parameters:</B><DD><CODE>context</CODE> - The context for evaluation<DT><B>Returns:</B><DD>The concatenation of all the character data within the document</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.<DD><DL> <DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html#evaluateAsBoolean(com.icl.saxon.Context)">evaluateAsBoolean</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/SingletonExpression.html">SingletonExpression</A></CODE></DL> </DD> <DD><DL> <DT><B>Parameters:</B><DD><CODE>context</CODE> - The context (not used)<DT><B>Returns:</B><DD>true (always - because the nodeset is never empty)</DL> </DD> </DL> <HR> <A NAME="getDependencies()"><!-- --></A><H3> getDependencies</H3> <PRE> public int <B>getDependencies</B>()</PRE> <DL> <DD>Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE<DD><DL> <DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#getDependencies()">getDependencies</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html">Expression</A></CODE></DL> </DD> </DL> <HR> <A NAME="reduce(int, com.icl.saxon.Context)"><!-- --></A><H3> reduce</H3> <PRE> public <A HREF="../../../../com/icl/saxon/expr/Expression.html">Expression</A> <B>reduce</B>(int dependencies, <A HREF="../../../../com/icl/saxon/Context.html">Context</A> context) throws <A HREF="../../../../com/icl/saxon/expr/XPathException.html">XPathException</A></PRE> <DL> <DD>Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.<DD><DL> <DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#reduce(int, com.icl.saxon.Context)">reduce</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html">Expression</A></CODE></DL> </DD> <DD><DL> <DT><B>Parameters:</B><DD><CODE>dependencies</CODE> - The dependencies to be removed<DD><CODE>context</CODE> - The context to be used for the partial evaluation<DT><B>Returns:</B><DD>a new expression that does not have any of the specified dependencies</DL> </DD> </DL> <HR> <A NAME="display(int)"><!-- --></A><H3> display</H3> <PRE> public void <B>display</B>(int level)</PRE> <DL> <DD>Diagnostic print of expression structure<DD><DL> <DT><B>Overrides:</B><DD><CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html#display(int)">display</A></CODE> in class <CODE><A HREF="../../../../com/icl/saxon/expr/Expression.html">Expression</A></CODE></DL> </DD> </DL> <!-- ========= END OF CLASS DATA ========= --> <HR> <!-- ========== START OF NAVBAR ========== --> <A NAME="navbar_bottom"><!-- --></A> <TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"> <TR> <TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A NAME="navbar_bottom_firstrow"><!-- --></A> <TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR> </TABLE> </TD> <TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM> </EM> </TD> </TR> <TR> <TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../com/icl/saxon/expr/PathExpression.html"><B>PREV CLASS</B></A> <A HREF="../../../../com/icl/saxon/expr/SingletonComparison.html"><B>NEXT CLASS</B></A></FONT></TD> <TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="RootExpression.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD> </TR> <TR> <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | <A HREF="#fields_inherited_from_class_com.icl.saxon.expr.Expression">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD> <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD> </TR> </TABLE> <!-- =========== END OF NAVBAR =========== --> <HR> </BODY> </HTML>