src/org/apache/xalan/xsltc/compiler/util/NodeSetType.java - xalan-j - Git at Google

 /*
  * @(#)$Id$
  *
  * The Apache Software License, Version 1.1
  *
  *
  * Copyright (c) 2001-2003 The Apache Software Foundation.  All rights
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *
  * 3. The end-user documentation included with the redistribution,
  *    if any, must include the following acknowledgment:
  *       "This product includes software developed by the
  *        Apache Software Foundation (http://www.apache.org/)."
  *    Alternately, this acknowledgment may appear in the software itself,
  *    if and wherever such third-party acknowledgments normally appear.
  *
  * 4. The names "Xalan" and "Apache Software Foundation" must
  *    not be used to endorse or promote products derived from this
  *    software without prior written permission. For written
  *    permission, please contact apache@apache.org.
  *
  * 5. Products derived from this software may not be called "Apache",
  *    nor may "Apache" appear in their name, without prior written
  *    permission of the Apache Software Foundation.
  *
  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  * ====================================================================
  *
  * This software consists of voluntary contributions made by many
  * individuals on behalf of the Apache Software Foundation and was
  * originally based on software copyright (c) 2001, Sun
  * Microsystems., http://www.sun.com.  For more
  * information on the Apache Software Foundation, please see
  * <http://www.apache.org/>.
  *
  * @author Jacek Ambroziak
  * @author Santiago Pericas-Geertsen
  *
  */

 package org.apache.xalan.xsltc.compiler.util;

 import org.apache.xalan.xsltc.compiler.util.Type;
 import org.apache.bcel.generic.*;
 import org.apache.xalan.xsltc.compiler.Parser;
 import org.apache.xalan.xsltc.compiler.FlowList;
 import org.apache.xalan.xsltc.compiler.Constants;

 public final class NodeSetType extends Type {
     protected NodeSetType() {}

     public String toString() {
 	return "node-set";
     }

     public boolean identicalTo(Type other) {
 	return this == other;
     }

     public String toSignature() {
 	return NODE_ITERATOR_SIG;
     }

     public org.apache.bcel.generic.Type toJCType() {
 	return new org.apache.bcel.generic.ObjectType(NODE_ITERATOR);
     }

     /**
      * Translates a node-set into an object of internal type
      * <code>type</code>. The translation to int is undefined
      * since node-sets are always converted to
      * reals in arithmetic expressions.
      *
      * @see	org.apache.xalan.xsltc.compiler.util.Type#translateTo
      */
     public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
 			    Type type) {
 	if (type == Type.String) {
 	    translateTo(classGen, methodGen, (StringType) type);
 	}
 	else if (type == Type.Boolean) {
 	    translateTo(classGen, methodGen, (BooleanType) type);
 	}
 	else if (type == Type.Real) {
 	    translateTo(classGen, methodGen, (RealType) type);
 	}
 	else if (type == Type.Node) {
 	    translateTo(classGen, methodGen, (NodeType) type);
 	}
 	else if (type == Type.Reference) {
 	    translateTo(classGen, methodGen, (ReferenceType) type);
 	}
 	else if (type == Type.Object) {
 	    translateTo(classGen, methodGen, (ObjectType) type);
 	}
 	else {
 	    ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
 					toString(), type.toString());
 	    classGen.getParser().reportError(Constants.FATAL, err);
 	}
     }

     /**
      * Translates an external Java Class into an internal type.
      * Expects the Java object on the stack, pushes the internal type
      */
     public void translateFrom(ClassGenerator classGen,
 	MethodGenerator methodGen, Class clazz)
     {

   	InstructionList il = methodGen.getInstructionList();
 	ConstantPoolGen cpg = classGen.getConstantPool();
 	if (clazz.getName().equals("org.w3c.dom.NodeList")) {
 	   // w3c NodeList is on the stack from the external Java function call.
 	   // call BasisFunction to consume NodeList and leave Iterator on
 	   //    the stack.
 	   il.append(classGen.loadTranslet());   // push translet onto stack
 	   il.append(methodGen.loadDOM());   	 // push DOM onto stack
 	   final int convert = cpg.addMethodref(BASIS_LIBRARY_CLASS,
 					"nodeList2Iterator",
 					"("
 					 + "Lorg/w3c/dom/NodeList;"
 					 + TRANSLET_INTF_SIG
 					 + DOM_INTF_SIG
 					 + ")" + NODE_ITERATOR_SIG );
 	   il.append(new INVOKESTATIC(convert));
 	}
 	else if (clazz.getName().equals("org.w3c.dom.Node")) {
 	   // w3c Node is on the stack from the external Java function call.
 	   // call BasisLibrary.node2Iterator() to consume Node and leave
 	   // Iterator on the stack.
 	   il.append(classGen.loadTranslet());   // push translet onto stack
 	   il.append(methodGen.loadDOM());   	 // push DOM onto stack
 	   final int convert = cpg.addMethodref(BASIS_LIBRARY_CLASS,
 					"node2Iterator",
 					"("
 					 + "Lorg/w3c/dom/Node;"
 					 + TRANSLET_INTF_SIG
 					 + DOM_INTF_SIG
 					 + ")" + NODE_ITERATOR_SIG );
 	   il.append(new INVOKESTATIC(convert));
 	}
 	else {
 	    ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
 		toString(), clazz.getName());
 	    classGen.getParser().reportError(Constants.FATAL, err);
 	}
     }


     /**
      * Translates a node-set into a synthesized boolean.
      * The boolean value of a node-set is "true" if non-empty
      * and "false" otherwise. Notice that the
      * function getFirstNode() is called in translateToDesynthesized().
      *
      * @see	org.apache.xalan.xsltc.compiler.util.Type#translateTo
      */
     public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
 			    BooleanType type) {
 	final InstructionList il = methodGen.getInstructionList();
 	FlowList falsel = translateToDesynthesized(classGen, methodGen, type);
 	il.append(ICONST_1);
 	final BranchHandle truec = il.append(new GOTO(null));
 	falsel.backPatch(il.append(ICONST_0));
 	truec.setTarget(il.append(NOP));
     }

     /**
      * Translates a node-set into a string. The string value of a node-set is
      * value of its first element.
      *
      * @see	org.apache.xalan.xsltc.compiler.util.Type#translateTo
      */
     public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
 			    StringType type) {
 	final InstructionList il = methodGen.getInstructionList();
 	getFirstNode(classGen, methodGen);
 	il.append(DUP);
 	final BranchHandle falsec = il.append(new IFEQ(null));
 	Type.Node.translateTo(classGen, methodGen, type);
 	final BranchHandle truec = il.append(new GOTO(null));
 	falsec.setTarget(il.append(POP));
 	il.append(new PUSH(classGen.getConstantPool(), ""));
 	truec.setTarget(il.append(NOP));
     }

     /**
      * Expects a node-set on the stack and pushes a real.
      * First the node-set is converted to string, and from string to real.
      *
      * @see	org.apache.xalan.xsltc.compiler.util.Type#translateTo
      */
     public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
 			    RealType type) {
 	translateTo(classGen, methodGen, Type.String);
 	Type.String.translateTo(classGen, methodGen, Type.Real);
     }

     /**
      * Expects a node-set on the stack and pushes a node.
      *
      * @see	org.apache.xalan.xsltc.compiler.util.Type#translateTo
      */
     public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
 			    NodeType type) {
 	getFirstNode(classGen, methodGen);
     }

     /**
      * Subsume node-set into ObjectType.
      *
      * @see	org.apache.xalan.xsltc.compiler.util.Type#translateTo
      */
     public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
 			    ObjectType type) {
 	    methodGen.getInstructionList().append(NOP);
     }

     /**
      * Translates a node-set into a non-synthesized boolean. It does not
      * push a 0 or a 1 but instead returns branchhandle list to be appended
      * to the false list.
      *
      * @see	org.apache.xalan.xsltc.compiler.util.Type#translateToDesynthesized
      */
     public FlowList translateToDesynthesized(ClassGenerator classGen,
 					     MethodGenerator methodGen,
 					     BooleanType type) {
 	final InstructionList il = methodGen.getInstructionList();
 	getFirstNode(classGen, methodGen);
 	return new FlowList(il.append(new IFEQ(null)));
     }

     /**
      * Expects a node-set on the stack and pushes a boxed node-set.
      * Node sets are already boxed so the translation is just a NOP.
      *
      * @see	org.apache.xalan.xsltc.compiler.util.Type#translateTo
      */
     public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
 			    ReferenceType type) {
 	methodGen.getInstructionList().append(NOP);
     }

     /**
      * Translates a node-set into the Java type denoted by <code>clazz</code>.
      * Expects a node-set on the stack and pushes an object of the appropriate
      * type after coercion.
      */
     public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
 			    Class clazz) {
 	final ConstantPoolGen cpg = classGen.getConstantPool();
 	final InstructionList il = methodGen.getInstructionList();
 	final String className = clazz.getName();

 	il.append(methodGen.loadDOM());
 	il.append(SWAP);

 	if (className.equals("org.w3c.dom.Node")) {
 	    int index = cpg.addInterfaceMethodref(DOM_INTF,
 						  MAKE_NODE,
 						  MAKE_NODE_SIG2);
 	    il.append(new INVOKEINTERFACE(index, 2));
 	}
         else if (className.equals("org.w3c.dom.NodeList") ||
                  className.equals("java.lang.Object")) {
 	    int index = cpg.addInterfaceMethodref(DOM_INTF,
 						  MAKE_NODE_LIST,
 						  MAKE_NODE_LIST_SIG2);
 	    il.append(new INVOKEINTERFACE(index, 2));
 	}
         else if (className.equals("java.lang.String")) {
             int next = cpg.addInterfaceMethodref(NODE_ITERATOR,
                                                  "next", "()I");
             int index = cpg.addInterfaceMethodref(DOM_INTF,
                                                  GET_NODE_VALUE,
                                                  "(I)"+STRING_SIG);

             // Get next node from the iterator
             il.append(new INVOKEINTERFACE(next, 1));
             // Get the node's string value (from the DOM)
             il.append(new INVOKEINTERFACE(index, 2));

         }
 	else if (className.equals("int")) {
 	    int next = cpg.addInterfaceMethodref(NODE_ITERATOR,
 						  "next", "()I");
 	    int index = cpg.addInterfaceMethodref(DOM_INTF,
 						  GET_NODE_VALUE,
 						  "(I)"+STRING_SIG);
 	    int str = cpg.addMethodref(BASIS_LIBRARY_CLASS,
 					STRING_TO_INT,
 					STRING_TO_INT_SIG);

 	    // Get next node from the iterator
 	    il.append(new INVOKEINTERFACE(next, 1));
 	    // Get the node's string value (from the DOM)
 	    il.append(new INVOKEINTERFACE(index, 2));
 	    // Create a new Integer object from the string value
 	    il.append(new INVOKESTATIC(str));
 	}
 	else {
 	    ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
 					toString(), className);
 	    classGen.getParser().reportError(Constants.FATAL, err);
 	}
     }

     /**
      * Some type conversions require gettting the first node from the node-set.
      * This function is defined to avoid code repetition.
      */
     private void getFirstNode(ClassGenerator classGen, MethodGenerator methodGen) {
 	final ConstantPoolGen cpg = classGen.getConstantPool();
 	final InstructionList il = methodGen.getInstructionList();
 	il.append(new INVOKEINTERFACE(cpg.addInterfaceMethodref(NODE_ITERATOR,
 								NEXT,
 								NEXT_SIG), 1));
     }

     /**
      * Translates an object of this type to its boxed representation.
      */
     public void translateBox(ClassGenerator classGen,
 			     MethodGenerator methodGen) {
 	translateTo(classGen, methodGen, Type.Reference);
     }

     /**
      * Translates an object of this type to its unboxed representation.
      */
     public void translateUnBox(ClassGenerator classGen,
 			       MethodGenerator methodGen) {
 	methodGen.getInstructionList().append(NOP);
     }

     /**
      * Returns the class name of an internal type's external representation.
      */
     public String getClassName() {
 	return(NODE_ITERATOR);
     }


     public Instruction LOAD(int slot) {
 	return new ALOAD(slot);
     }

     public Instruction STORE(int slot) {
 	return new ASTORE(slot);
     }
 }
	/*
	* @(#)$Id$
	*
	* The Apache Software License, Version 1.1
	*
	*
	* Copyright (c) 2001-2003 The Apache Software Foundation. All rights
	* reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	*
	* 3. The end-user documentation included with the redistribution,
	* if any, must include the following acknowledgment:
	* "This product includes software developed by the
	* Apache Software Foundation (http://www.apache.org/)."
	* Alternately, this acknowledgment may appear in the software itself,
	* if and wherever such third-party acknowledgments normally appear.
	*
	* 4. The names "Xalan" and "Apache Software Foundation" must
	* not be used to endorse or promote products derived from this
	* software without prior written permission. For written
	* permission, please contact apache@apache.org.
	*
	* 5. Products derived from this software may not be called "Apache",
	* nor may "Apache" appear in their name, without prior written
	* permission of the Apache Software Foundation.
	*
	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	* ====================================================================
	*
	* This software consists of voluntary contributions made by many
	* individuals on behalf of the Apache Software Foundation and was
	* originally based on software copyright (c) 2001, Sun
	* Microsystems., http://www.sun.com. For more
	* information on the Apache Software Foundation, please see
	* <http://www.apache.org/>.
	*
	* @author Jacek Ambroziak
	* @author Santiago Pericas-Geertsen
	*
	*/

	package org.apache.xalan.xsltc.compiler.util;

	import org.apache.xalan.xsltc.compiler.util.Type;
	import org.apache.bcel.generic.*;
	import org.apache.xalan.xsltc.compiler.Parser;
	import org.apache.xalan.xsltc.compiler.FlowList;
	import org.apache.xalan.xsltc.compiler.Constants;

	public final class NodeSetType extends Type {
	protected NodeSetType() {}

	public String toString() {
	return "node-set";
	}

	public boolean identicalTo(Type other) {
	return this == other;
	}

	public String toSignature() {
	return NODE_ITERATOR_SIG;
	}

	public org.apache.bcel.generic.Type toJCType() {
	return new org.apache.bcel.generic.ObjectType(NODE_ITERATOR);
	}

	/**
	* Translates a node-set into an object of internal type
	* <code>type</code>. The translation to int is undefined
	* since node-sets are always converted to
	* reals in arithmetic expressions.
	*
	* @see org.apache.xalan.xsltc.compiler.util.Type#translateTo
	*/
	public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
	Type type) {
	if (type == Type.String) {
	translateTo(classGen, methodGen, (StringType) type);
	}
	else if (type == Type.Boolean) {
	translateTo(classGen, methodGen, (BooleanType) type);
	}
	else if (type == Type.Real) {
	translateTo(classGen, methodGen, (RealType) type);
	}
	else if (type == Type.Node) {
	translateTo(classGen, methodGen, (NodeType) type);
	}
	else if (type == Type.Reference) {
	translateTo(classGen, methodGen, (ReferenceType) type);
	}
	else if (type == Type.Object) {
	translateTo(classGen, methodGen, (ObjectType) type);
	}
	else {
	ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
	toString(), type.toString());
	classGen.getParser().reportError(Constants.FATAL, err);
	}
	}

	/**
	* Translates an external Java Class into an internal type.
	* Expects the Java object on the stack, pushes the internal type
	*/
	public void translateFrom(ClassGenerator classGen,
	MethodGenerator methodGen, Class clazz)
	{

	InstructionList il = methodGen.getInstructionList();
	ConstantPoolGen cpg = classGen.getConstantPool();
	if (clazz.getName().equals("org.w3c.dom.NodeList")) {
	// w3c NodeList is on the stack from the external Java function call.
	// call BasisFunction to consume NodeList and leave Iterator on
	// the stack.
	il.append(classGen.loadTranslet()); // push translet onto stack
	il.append(methodGen.loadDOM()); // push DOM onto stack
	final int convert = cpg.addMethodref(BASIS_LIBRARY_CLASS,
	"nodeList2Iterator",
	"("
	+ "Lorg/w3c/dom/NodeList;"
	+ TRANSLET_INTF_SIG
	+ DOM_INTF_SIG
	+ ")" + NODE_ITERATOR_SIG );
	il.append(new INVOKESTATIC(convert));
	}
	else if (clazz.getName().equals("org.w3c.dom.Node")) {
	// w3c Node is on the stack from the external Java function call.
	// call BasisLibrary.node2Iterator() to consume Node and leave
	// Iterator on the stack.
	il.append(classGen.loadTranslet()); // push translet onto stack
	il.append(methodGen.loadDOM()); // push DOM onto stack
	final int convert = cpg.addMethodref(BASIS_LIBRARY_CLASS,
	"node2Iterator",
	"("
	+ "Lorg/w3c/dom/Node;"
	+ TRANSLET_INTF_SIG
	+ DOM_INTF_SIG
	+ ")" + NODE_ITERATOR_SIG );
	il.append(new INVOKESTATIC(convert));
	}
	else {
	ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
	toString(), clazz.getName());
	classGen.getParser().reportError(Constants.FATAL, err);
	}
	}


	/**
	* Translates a node-set into a synthesized boolean.
	* The boolean value of a node-set is "true" if non-empty
	* and "false" otherwise. Notice that the
	* function getFirstNode() is called in translateToDesynthesized().
	*
	* @see org.apache.xalan.xsltc.compiler.util.Type#translateTo
	*/
	public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
	BooleanType type) {
	final InstructionList il = methodGen.getInstructionList();
	FlowList falsel = translateToDesynthesized(classGen, methodGen, type);
	il.append(ICONST_1);
	final BranchHandle truec = il.append(new GOTO(null));
	falsel.backPatch(il.append(ICONST_0));
	truec.setTarget(il.append(NOP));
	}

	/**
	* Translates a node-set into a string. The string value of a node-set is
	* value of its first element.
	*
	* @see org.apache.xalan.xsltc.compiler.util.Type#translateTo
	*/
	public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
	StringType type) {
	final InstructionList il = methodGen.getInstructionList();
	getFirstNode(classGen, methodGen);
	il.append(DUP);
	final BranchHandle falsec = il.append(new IFEQ(null));
	Type.Node.translateTo(classGen, methodGen, type);
	final BranchHandle truec = il.append(new GOTO(null));
	falsec.setTarget(il.append(POP));
	il.append(new PUSH(classGen.getConstantPool(), ""));
	truec.setTarget(il.append(NOP));
	}

	/**
	* Expects a node-set on the stack and pushes a real.
	* First the node-set is converted to string, and from string to real.
	*
	* @see org.apache.xalan.xsltc.compiler.util.Type#translateTo
	*/
	public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
	RealType type) {
	translateTo(classGen, methodGen, Type.String);
	Type.String.translateTo(classGen, methodGen, Type.Real);
	}

	/**
	* Expects a node-set on the stack and pushes a node.
	*
	* @see org.apache.xalan.xsltc.compiler.util.Type#translateTo
	*/
	public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
	NodeType type) {
	getFirstNode(classGen, methodGen);
	}

	/**
	* Subsume node-set into ObjectType.
	*
	* @see org.apache.xalan.xsltc.compiler.util.Type#translateTo
	*/
	public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
	ObjectType type) {
	methodGen.getInstructionList().append(NOP);
	}

	/**
	* Translates a node-set into a non-synthesized boolean. It does not
	* push a 0 or a 1 but instead returns branchhandle list to be appended
	* to the false list.
	*
	* @see org.apache.xalan.xsltc.compiler.util.Type#translateToDesynthesized
	*/
	public FlowList translateToDesynthesized(ClassGenerator classGen,
	MethodGenerator methodGen,
	BooleanType type) {
	final InstructionList il = methodGen.getInstructionList();
	getFirstNode(classGen, methodGen);
	return new FlowList(il.append(new IFEQ(null)));
	}

	/**
	* Expects a node-set on the stack and pushes a boxed node-set.
	* Node sets are already boxed so the translation is just a NOP.
	*
	* @see org.apache.xalan.xsltc.compiler.util.Type#translateTo
	*/
	public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
	ReferenceType type) {
	methodGen.getInstructionList().append(NOP);
	}

	/**
	* Translates a node-set into the Java type denoted by <code>clazz</code>.
	* Expects a node-set on the stack and pushes an object of the appropriate
	* type after coercion.
	*/
	public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
	Class clazz) {
	final ConstantPoolGen cpg = classGen.getConstantPool();
	final InstructionList il = methodGen.getInstructionList();
	final String className = clazz.getName();

	il.append(methodGen.loadDOM());
	il.append(SWAP);

	if (className.equals("org.w3c.dom.Node")) {
	int index = cpg.addInterfaceMethodref(DOM_INTF,
	MAKE_NODE,
	MAKE_NODE_SIG2);
	il.append(new INVOKEINTERFACE(index, 2));
	}
	else if (className.equals("org.w3c.dom.NodeList") \|\|
	className.equals("java.lang.Object")) {
	int index = cpg.addInterfaceMethodref(DOM_INTF,
	MAKE_NODE_LIST,
	MAKE_NODE_LIST_SIG2);
	il.append(new INVOKEINTERFACE(index, 2));
	}
	else if (className.equals("java.lang.String")) {
	int next = cpg.addInterfaceMethodref(NODE_ITERATOR,
	"next", "()I");
	int index = cpg.addInterfaceMethodref(DOM_INTF,
	GET_NODE_VALUE,
	"(I)"+STRING_SIG);

	// Get next node from the iterator
	il.append(new INVOKEINTERFACE(next, 1));
	// Get the node's string value (from the DOM)
	il.append(new INVOKEINTERFACE(index, 2));

	}
	else if (className.equals("int")) {
	int next = cpg.addInterfaceMethodref(NODE_ITERATOR,
	"next", "()I");
	int index = cpg.addInterfaceMethodref(DOM_INTF,
	GET_NODE_VALUE,
	"(I)"+STRING_SIG);
	int str = cpg.addMethodref(BASIS_LIBRARY_CLASS,
	STRING_TO_INT,
	STRING_TO_INT_SIG);

	// Get next node from the iterator
	il.append(new INVOKEINTERFACE(next, 1));
	// Get the node's string value (from the DOM)
	il.append(new INVOKEINTERFACE(index, 2));
	// Create a new Integer object from the string value
	il.append(new INVOKESTATIC(str));
	}
	else {
	ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
	toString(), className);
	classGen.getParser().reportError(Constants.FATAL, err);
	}
	}

	/**
	* Some type conversions require gettting the first node from the node-set.
	* This function is defined to avoid code repetition.
	*/
	private void getFirstNode(ClassGenerator classGen, MethodGenerator methodGen) {
	final ConstantPoolGen cpg = classGen.getConstantPool();
	final InstructionList il = methodGen.getInstructionList();
	il.append(new INVOKEINTERFACE(cpg.addInterfaceMethodref(NODE_ITERATOR,
	NEXT,
	NEXT_SIG), 1));
	}

	/**
	* Translates an object of this type to its boxed representation.
	*/
	public void translateBox(ClassGenerator classGen,
	MethodGenerator methodGen) {
	translateTo(classGen, methodGen, Type.Reference);
	}

	/**
	* Translates an object of this type to its unboxed representation.
	*/
	public void translateUnBox(ClassGenerator classGen,
	MethodGenerator methodGen) {
	methodGen.getInstructionList().append(NOP);
	}

	/**
	* Returns the class name of an internal type's external representation.
	*/
	public String getClassName() {
	return(NODE_ITERATOR);
	}


	public Instruction LOAD(int slot) {
	return new ALOAD(slot);
	}

	public Instruction STORE(int slot) {
	return new ASTORE(slot);
	}
	}