1 /* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5 /* 6 * Copyright 2001-2004 The Apache Software Foundation. 7 * 8 * Licensed under the Apache License, Version 2.0 (the "License"); 9 * you may not use this file except in compliance with the License. 10 * You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 /* 21 * $Id: Comment.java,v 1.2.4.1 2005/09/01 12:02:37 pvedula Exp $ 22 */ 23 24 package com.sun.org.apache.xalan.internal.xsltc.compiler; 25 26 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; 27 import com.sun.org.apache.bcel.internal.generic.GETFIELD; 28 import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE; 29 import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL; 30 import com.sun.org.apache.bcel.internal.generic.PUSH; 31 import com.sun.org.apache.bcel.internal.generic.InstructionList; 32 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; 33 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; 34 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; 35 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; 36 37 /** 38 * @author Jacek Ambroziak 39 * @author Santiago Pericas-Geertsen 40 * @author Morten Jorgensen 41 */ 42 final class Comment extends Instruction { 43 44 public void parseContents(Parser parser) { 45 parseChildren(parser); 46 } 47 48 public Type typeCheck(SymbolTable stable) throws TypeCheckError { 49 typeCheckContents(stable); 50 return Type.String; 51 } 52 53 public void translate(ClassGenerator classGen, MethodGenerator methodGen) { 54 final ConstantPoolGen cpg = classGen.getConstantPool(); 55 final InstructionList il = methodGen.getInstructionList(); 56 57 // Shortcut for literal strings 58 Text rawText = null; 59 if (elementCount() == 1) { 60 Object content = elementAt(0); 61 if (content instanceof Text) { 62 rawText = (Text) content; 63 } 64 } 65 66 // If the content is literal text, call comment(char[],int,int) or 67 // comment(String), as appropriate. Otherwise, use a 68 // StringValueHandler to gather the textual content of the xsl:comment 69 // and call comment(String) with the result. 70 if (rawText != null) { 71 il.append(methodGen.loadHandler()); 72 73 if (rawText.canLoadAsArrayOffsetLength()) { 74 rawText.loadAsArrayOffsetLength(classGen, methodGen); 75 final int comment = 76 cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE, 77 "comment", 78 "([CII)V"); 79 il.append(new INVOKEINTERFACE(comment, 4)); 80 } else { 81 il.append(new PUSH(cpg, rawText.getText())); 82 final int comment = 83 cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE, 84 "comment", 85 "(" + STRING_SIG + ")V"); 86 il.append(new INVOKEINTERFACE(comment, 2)); 87 } 88 } else { 89 // Save the current handler base on the stack 90 il.append(methodGen.loadHandler()); 91 il.append(DUP); // first arg to "comment" call 92 93 // Get the translet's StringValueHandler 94 il.append(classGen.loadTranslet()); 95 il.append(new GETFIELD(cpg.addFieldref(TRANSLET_CLASS, 96 "stringValueHandler", 97 STRING_VALUE_HANDLER_SIG))); 98 il.append(DUP); 99 il.append(methodGen.storeHandler()); 100 101 // translate contents with substituted handler 102 translateContents(classGen, methodGen); 103 104 // get String out of the handler 105 il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_VALUE_HANDLER, 106 "getValue", 107 "()" + STRING_SIG))); 108 // call "comment" 109 final int comment = 110 cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE, 111 "comment", 112 "(" + STRING_SIG + ")V"); 113 il.append(new INVOKEINTERFACE(comment, 2)); 114 // Restore old handler base from stack 115 il.append(methodGen.storeHandler()); 116 } 117 } 118 }