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LoopBodyGenerator
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com.saxonica.bytecode.util</FONT>
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Class LoopBodyGenerator</H2>
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<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>com.saxonica.bytecode.util.LoopBodyGenerator</B>
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<DT><PRE>public abstract class <B>LoopBodyGenerator</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>
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<P>
LoopBodyGenerator is code to generate the body of a loop, for example of a ForExpression. When the ForExpression
is compiled as a loop, this callback specifies how to generate code for the loop body. For example, if the caller
is the compiler for the sum() function, the callback will increment the local variable holding the total so far.
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<TD><CODE><B><A HREF="../../../../com/saxonica/bytecode/util/LoopBodyGenerator.html#LoopBodyGenerator()">LoopBodyGenerator</A></B>()</CODE>
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<CODE>abstract void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/bytecode/util/LoopBodyGenerator.html#generateLoopBody(com.saxonica.bytecode.util.CompilerService)">generateLoopBody</A></B>(<A HREF="../../../../com/saxonica/bytecode/util/CompilerService.html" title="class in com.saxonica.bytecode.util">CompilerService</A> compiler)</CODE>
<BR>
Generate the code to process each item delivered by the looping expression.</TD>
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<CODE> <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></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/bytecode/util/LoopBodyGenerator.html#getExpectedItemClass()">getExpectedItemClass</A></B>()</CODE>
<BR>
Say in what form the loop body generator expects the items to be delivered.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/bytecode/util/LoopBodyGenerator.html#isSmallAmountOfCode()">isSmallAmountOfCode</A></B>()</CODE>
<BR>
Say whether the amount of code generated is sufficiently small that we don't mind it being
generated more than once.</TD>
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<A NAME="LoopBodyGenerator()"><!-- --></A><H3>
LoopBodyGenerator</H3>
<PRE>
public <B>LoopBodyGenerator</B>()</PRE>
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<A NAME="generateLoopBody(com.saxonica.bytecode.util.CompilerService)"><!-- --></A><H3>
generateLoopBody</H3>
<PRE>
public abstract void <B>generateLoopBody</B>(<A HREF="../../../../com/saxonica/bytecode/util/CompilerService.html" title="class in com.saxonica.bytecode.util">CompilerService</A> compiler)
throws <A HREF="../../../../com/saxonica/bytecode/util/CannotCompileException.html" title="class in com.saxonica.bytecode.util">CannotCompileException</A></PRE>
<DL>
<DD>Generate the code to process each item delivered by the looping expression. On entry to this code,
the relevant item will be on the top of the bytecode stack. On exit the stack will be empty (that is,
this item will have been removed)
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>compiler</CODE> - the compiler service
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../com/saxonica/bytecode/util/CannotCompileException.html" title="class in com.saxonica.bytecode.util">CannotCompileException</A></CODE> - if the expression cannot be compiled</DL>
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<A NAME="getExpectedItemClass()"><!-- --></A><H3>
getExpectedItemClass</H3>
<PRE>
public <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> <B>getExpectedItemClass</B>()</PRE>
<DL>
<DD>Say in what form the loop body generator expects the items to be delivered. This method returns
a class which gives the expected type of the item on the top of stack at the point where the
loop body code takes over. The default is that the item is on the stack as an instance of
<A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om"><CODE>Item</CODE></A>. The alternative is to ask for it to be placed as a primitive value,
for example of type Double.TYPE or Boolean.TYPE, or as a Java String or BigDecimal object
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the class of objects to be delivered</DL>
</DD>
</DL>
<HR>
<A NAME="isSmallAmountOfCode()"><!-- --></A><H3>
isSmallAmountOfCode</H3>
<PRE>
public boolean <B>isSmallAmountOfCode</B>()</PRE>
<DL>
<DD>Say whether the amount of code generated is sufficiently small that we don't mind it being
generated more than once.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>true if the amount of code to be generated is small</DL>
</DD>
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