| /* |
| * @(#)$Id$ |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2001 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 { |
| ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR, |
| toString(), type.toString()); |
| 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); |
| } |
| |
| /** |
| * 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")) { |
| int index = cpg.addInterfaceMethodref(DOM_INTF, |
| MAKE_NODE_LIST, |
| MAKE_NODE_LIST_SIG2); |
| 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); |
| } |
| } |