| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| /* |
| * $Id$ |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import org.apache.bcel.generic.ALOAD; |
| import org.apache.bcel.generic.ASTORE; |
| import org.apache.bcel.generic.BranchHandle; |
| import org.apache.bcel.generic.ConstantPoolGen; |
| import org.apache.bcel.generic.IFEQ; |
| import org.apache.bcel.generic.IFNULL; |
| import org.apache.bcel.generic.ILOAD; |
| import org.apache.bcel.generic.INVOKEINTERFACE; |
| import org.apache.bcel.generic.INVOKEVIRTUAL; |
| import org.apache.bcel.generic.ISTORE; |
| import org.apache.bcel.generic.InstructionHandle; |
| import org.apache.bcel.generic.InstructionList; |
| import org.apache.bcel.generic.LocalVariableGen; |
| import org.apache.xalan.xsltc.compiler.util.ClassGenerator; |
| import org.apache.xalan.xsltc.compiler.util.ErrorMsg; |
| import org.apache.xalan.xsltc.compiler.util.MethodGenerator; |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| import org.apache.xalan.xsltc.compiler.util.TypeCheckError; |
| import org.apache.xalan.xsltc.compiler.util.Util; |
| |
| /** |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| */ |
| final class Copy extends Instruction { |
| private UseAttributeSets _useSets; |
| |
| public void parseContents(Parser parser) { |
| final String useSets = getAttribute("use-attribute-sets"); |
| if (useSets.length() > 0) { |
| if (!Util.isValidQNames(useSets)) { |
| ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_QNAME_ERR, useSets, this); |
| parser.reportError(Constants.ERROR, err); |
| } |
| _useSets = new UseAttributeSets(useSets, parser); |
| } |
| parseChildren(parser); |
| } |
| |
| public void display(int indent) { |
| indent(indent); |
| Util.println("Copy"); |
| indent(indent + IndentIncrement); |
| displayContents(indent + IndentIncrement); |
| } |
| |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| if (_useSets != null) { |
| _useSets.typeCheck(stable); |
| } |
| typeCheckContents(stable); |
| return Type.Void; |
| } |
| |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| |
| final LocalVariableGen name = |
| methodGen.addLocalVariable2("name", |
| Util.getJCRefType(STRING_SIG), |
| null); |
| final LocalVariableGen length = |
| methodGen.addLocalVariable2("length", |
| Util.getJCRefType("I"), |
| null); |
| |
| // Get the name of the node to copy and save for later |
| il.append(methodGen.loadDOM()); |
| il.append(methodGen.loadCurrentNode()); |
| il.append(methodGen.loadHandler()); |
| final int cpy = cpg.addInterfaceMethodref(DOM_INTF, |
| "shallowCopy", |
| "(" |
| + NODE_SIG |
| + TRANSLET_OUTPUT_SIG |
| + ")" + STRING_SIG); |
| il.append(new INVOKEINTERFACE(cpy, 3)); |
| il.append(DUP); |
| name.setStart(il.append(new ASTORE(name.getIndex()))); |
| final BranchHandle ifBlock1 = il.append(new IFNULL(null)); |
| |
| // Get the length of the node name and save for later |
| il.append(new ALOAD(name.getIndex())); |
| final int lengthMethod = cpg.addMethodref(STRING_CLASS,"length","()I"); |
| il.append(new INVOKEVIRTUAL(lengthMethod)); |
| length.setStart(il.append(new ISTORE(length.getIndex()))); |
| |
| // Copy in attribute sets if specified |
| if (_useSets != null) { |
| // If the parent of this element will result in an element being |
| // output then we know that it is safe to copy out the attributes |
| final SyntaxTreeNode parent = getParent(); |
| if ((parent instanceof LiteralElement) || |
| (parent instanceof LiteralElement)) { |
| _useSets.translate(classGen, methodGen); |
| } |
| // If not we have to check to see if the copy will result in an |
| // element being output. |
| else { |
| // check if element; if not skip to translate body |
| il.append(new ILOAD(length.getIndex())); |
| final BranchHandle ifBlock2 = il.append(new IFEQ(null)); |
| // length != 0 -> element -> do attribute sets |
| _useSets.translate(classGen, methodGen); |
| // not an element; root |
| ifBlock2.setTarget(il.append(NOP)); |
| } |
| } |
| |
| // Instantiate body of xsl:copy |
| translateContents(classGen, methodGen); |
| |
| // Call the output handler's endElement() if we copied an element |
| // (The DOM.shallowCopy() method calls startElement().) |
| length.setEnd(il.append(new ILOAD(length.getIndex()))); |
| final BranchHandle ifBlock3 = il.append(new IFEQ(null)); |
| il.append(methodGen.loadHandler()); |
| name.setEnd(il.append(new ALOAD(name.getIndex()))); |
| il.append(methodGen.endElement()); |
| |
| final InstructionHandle end = il.append(NOP); |
| ifBlock1.setTarget(end); |
| ifBlock3.setTarget(end); |
| methodGen.removeLocalVariable(name); |
| methodGen.removeLocalVariable(length); |
| } |
| } |