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CountCompiler
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com.saxonica.bytecode</FONT>
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Class CountCompiler</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 "><A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html" title="class in com.saxonica.bytecode">com.saxonica.bytecode.ExpressionCompiler</A>
      <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../com/saxonica/bytecode/ToItemCompiler.html" title="class in com.saxonica.bytecode">com.saxonica.bytecode.ToItemCompiler</A>
          <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.saxonica.bytecode.CountCompiler</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>CountCompiler</B><DT>extends <A HREF="../../../com/saxonica/bytecode/ToItemCompiler.html" title="class in com.saxonica.bytecode">ToItemCompiler</A></DL>
</PRE>

<P>
Generate bytecode for a call to the count() function
<P>

<P>
<HR>

<P>

<!-- ======== CONSTRUCTOR SUMMARY ======== -->

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<TD><CODE><B><A HREF="../../../com/saxonica/bytecode/CountCompiler.html#CountCompiler()">CountCompiler</A></B>()</CODE>

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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/saxonica/bytecode/CountCompiler.html#compileToItem(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression)">compileToItem</A></B>(<A HREF="../../../com/saxonica/bytecode/util/CompilerService.html" title="class in com.saxonica.bytecode.util">CompilerService</A>&nbsp;compiler,
              <A HREF="../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>&nbsp;expression)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Generate bytecode to evaluate the expression as an Item
 Precondition: none.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/saxonica/bytecode/CountCompiler.html#compileToPrimitive(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression, java.lang.Class, com.saxonica.bytecode.util.OnEmpty)">compileToPrimitive</A></B>(<A HREF="../../../com/saxonica/bytecode/util/CompilerService.html" title="class in com.saxonica.bytecode.util">CompilerService</A>&nbsp;compiler,
                   <A HREF="../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>&nbsp;expression,
                   <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&nbsp;requiredClass,
                   <A HREF="../../../com/saxonica/bytecode/util/OnEmpty.html" title="class in com.saxonica.bytecode.util">OnEmpty</A>&nbsp;onEmpty)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Generate bytecode to evaluate the expression leaving a plain Java value on the stack.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/saxonica/bytecode/CountCompiler.html#maybeLastPositionFinder(net.sf.saxon.expr.Expression)">maybeLastPositionFinder</A></B>(<A HREF="../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>&nbsp;expression)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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&nbsp;<A NAME="methods_inherited_from_class_com.saxonica.bytecode.ToItemCompiler"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class com.saxonica.bytecode.<A HREF="../../../com/saxonica/bytecode/ToItemCompiler.html" title="class in com.saxonica.bytecode">ToItemCompiler</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../com/saxonica/bytecode/ToItemCompiler.html#compileToBoolean(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression)">compileToBoolean</A>, <A HREF="../../../com/saxonica/bytecode/ToItemCompiler.html#compileToIterator(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression)">compileToIterator</A>, <A HREF="../../../com/saxonica/bytecode/ToItemCompiler.html#compileToPush(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression)">compileToPush</A>, <A HREF="../../../com/saxonica/bytecode/ToItemCompiler.html#returnZeroLengthStringIfNull(net.sf.saxon.expr.Expression, com.saxonica.bytecode.util.Generator, com.saxonica.bytecode.util.GeneratedMethodInfo, com.saxonica.bytecode.util.LabelInfo, int)">returnZeroLengthStringIfNull</A></CODE></TD>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class com.saxonica.bytecode.<A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html" title="class in com.saxonica.bytecode">ExpressionCompiler</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#allocateStatic(com.saxonica.bytecode.util.CompilerService, java.lang.Object)">allocateStatic</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#compileItemFromInt(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression)">compileItemFromInt</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#compileItemFromString(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression)">compileItemFromString</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#compileToLoop(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression, com.saxonica.bytecode.util.LoopBodyGenerator)">compileToLoop</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#generateMethod(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression, org.objectweb.asm.ClassVisitor)">generateMethod</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#getConfiguration()">getConfiguration</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#handleEmptyStringResult(com.saxonica.bytecode.util.OnEmpty, com.saxonica.bytecode.util.Generator, com.saxonica.bytecode.util.GeneratedMethodInfo, com.saxonica.bytecode.util.LabelInfo)">handleEmptyStringResult</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#setConfiguration(net.sf.saxon.Configuration)">setConfiguration</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#throwXPathException(com.saxonica.bytecode.util.CompilerService, com.saxonica.bytecode.util.MessageBuilder, java.lang.String, javax.xml.transform.SourceLocator, boolean)">throwXPathException</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#throwXPathException(com.saxonica.bytecode.util.CompilerService, java.lang.String, java.lang.String, javax.xml.transform.SourceLocator, boolean)">throwXPathException</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#unboxItem(com.saxonica.bytecode.util.Generator, java.lang.Class)">unboxItem</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#verify(org.objectweb.asm.ClassWriter, java.lang.String, boolean)">verify</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#visitAnnotation(com.saxonica.bytecode.util.CompilerService, java.lang.String)">visitAnnotation</A>, <A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#visitLineNumber(com.saxonica.bytecode.util.CompilerService, com.saxonica.bytecode.util.Generator, net.sf.saxon.expr.Expression)">visitLineNumber</A></CODE></TD>
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&nbsp;<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>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<A NAME="CountCompiler()"><!-- --></A><H3>
CountCompiler</H3>
<PRE>
public <B>CountCompiler</B>()</PRE>
<DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

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<A NAME="compileToPrimitive(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression, java.lang.Class, com.saxonica.bytecode.util.OnEmpty)"><!-- --></A><H3>
compileToPrimitive</H3>
<PRE>
public void <B>compileToPrimitive</B>(<A HREF="../../../com/saxonica/bytecode/util/CompilerService.html" title="class in com.saxonica.bytecode.util">CompilerService</A>&nbsp;compiler,
                               <A HREF="../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>&nbsp;expression,
                               <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&nbsp;requiredClass,
                               <A HREF="../../../com/saxonica/bytecode/util/OnEmpty.html" title="class in com.saxonica.bytecode.util">OnEmpty</A>&nbsp;onEmpty)
                        throws <A HREF="../../../com/saxonica/bytecode/util/CannotCompileException.html" title="class in com.saxonica.bytecode.util">CannotCompileException</A></PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#compileToPrimitive(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression, java.lang.Class, com.saxonica.bytecode.util.OnEmpty)">ExpressionCompiler</A></CODE></B></DD>
<DD>Generate bytecode to evaluate the expression leaving a plain Java value on the stack. This method
 must only be called if the static type of the expressionis such that the value is known to be representable
 by a value of the specified class; the cardinality must be either exactly-one or zero-or-one.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#compileToPrimitive(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression, java.lang.Class, com.saxonica.bytecode.util.OnEmpty)">compileToPrimitive</A></CODE> in class <CODE><A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html" title="class in com.saxonica.bytecode">ExpressionCompiler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>compiler</CODE> - the compiler service<DD><CODE>expression</CODE> - the expression to be compiled<DD><CODE>requiredClass</CODE> - the class of the Java value that is to be left on the stack if the generated code
 exits normally. This must be one of Integer.TYPE, Double.TYPE, Float.TYPE, BigDecimal.class, CharSequence.class.<DD><CODE>onEmpty</CODE> - defines the action to be taken if the expression evaluates to the empty sequence.
 May be null if the expression is known statically not to evaluate to an empty sequence. If the return
 class is a primitive type (double, float, etc) this must be an instance of <A HREF="../../../com/saxonica/bytecode/util/OnEmpty.UnwindAndJump.html" title="class in com.saxonica.bytecode.util"><CODE>OnEmpty.UnwindAndJump</CODE></A>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/saxonica/bytecode/util/CannotCompileException.html" title="class in com.saxonica.bytecode.util">CannotCompileException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="compileToItem(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression)"><!-- --></A><H3>
compileToItem</H3>
<PRE>
public void <B>compileToItem</B>(<A HREF="../../../com/saxonica/bytecode/util/CompilerService.html" title="class in com.saxonica.bytecode.util">CompilerService</A>&nbsp;compiler,
                          <A HREF="../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>&nbsp;expression)
                   throws <A HREF="../../../com/saxonica/bytecode/util/CannotCompileException.html" title="class in com.saxonica.bytecode.util">CannotCompileException</A></PRE>
<DL>
<DD>Generate bytecode to evaluate the expression as an Item
 Precondition: none.
 Postcondition: the stack contains either an item (the result of the expression), or null
 (representing an empty sequence).
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html#compileToItem(com.saxonica.bytecode.util.CompilerService, net.sf.saxon.expr.Expression)">compileToItem</A></CODE> in class <CODE><A HREF="../../../com/saxonica/bytecode/ExpressionCompiler.html" title="class in com.saxonica.bytecode">ExpressionCompiler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>compiler</CODE> - the compiler service<DD><CODE>expression</CODE> - the expression to be compiled
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/saxonica/bytecode/util/CannotCompileException.html" title="class in com.saxonica.bytecode.util">CannotCompileException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="maybeLastPositionFinder(net.sf.saxon.expr.Expression)"><!-- --></A><H3>
maybeLastPositionFinder</H3>
<PRE>
public static boolean <B>maybeLastPositionFinder</B>(<A HREF="../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>&nbsp;expression)</PRE>
<DL>
<DD><DL>
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