1/* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5/* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22package com.sun.org.apache.xalan.internal.xsltc.compiler; 23 24import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; 25import com.sun.org.apache.bcel.internal.generic.GOTO; 26import com.sun.org.apache.bcel.internal.generic.IFNE; 27import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE; 28import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL; 29import com.sun.org.apache.bcel.internal.generic.InstructionList; 30import com.sun.org.apache.bcel.internal.generic.PUSH; 31import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; 32import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; 33import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; 34import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; 35 36/** 37 * @author Jacek Ambroziak 38 * @author Santiago Pericas-Geertsen 39 */ 40abstract class IdKeyPattern extends LocationPathPattern { 41 42 protected RelativePathPattern _left = null;; 43 private String _index = null; 44 private String _value = null;; 45 46 public IdKeyPattern(String index, String value) { 47 _index = index; 48 _value = value; 49 } 50 51 public String getIndexName() { 52 return(_index); 53 } 54 55 public Type typeCheck(SymbolTable stable) throws TypeCheckError { 56 return Type.NodeSet; 57 } 58 59 public boolean isWildcard() { 60 return false; 61 } 62 63 public void setLeft(RelativePathPattern left) { 64 _left = left; 65 } 66 67 public StepPattern getKernelPattern() { 68 return(null); 69 } 70 71 public void reduceKernelPattern() { } 72 73 public String toString() { 74 return "id/keyPattern(" + _index + ", " + _value + ')'; 75 } 76 77 /** 78 * This method is called when the constructor is compiled in 79 * Stylesheet.compileConstructor() and not as the syntax tree is traversed. 80 */ 81 public void translate(ClassGenerator classGen, 82 MethodGenerator methodGen) { 83 84 final ConstantPoolGen cpg = classGen.getConstantPool(); 85 final InstructionList il = methodGen.getInstructionList(); 86 87 // Returns the KeyIndex object of a given name 88 final int getKeyIndex = cpg.addMethodref(TRANSLET_CLASS, 89 "getKeyIndex", 90 "(Ljava/lang/String;)"+ 91 KEY_INDEX_SIG); 92 93 // Initialises a KeyIndex to return nodes with specific values 94 final int lookupId = cpg.addMethodref(KEY_INDEX_CLASS, 95 "containsID", 96 "(ILjava/lang/Object;)I"); 97 final int lookupKey = cpg.addMethodref(KEY_INDEX_CLASS, 98 "containsKey", 99 "(ILjava/lang/Object;)I"); 100 final int getNodeIdent = cpg.addInterfaceMethodref(DOM_INTF, 101 "getNodeIdent", 102 "(I)"+NODE_SIG); 103 104 // Call getKeyIndex in AbstractTranslet with the name of the key 105 // to get the index for this key (which is also a node iterator). 106 il.append(classGen.loadTranslet()); 107 il.append(new PUSH(cpg,_index)); 108 il.append(new INVOKEVIRTUAL(getKeyIndex)); 109 110 // Now use the value in the second argument to determine what nodes 111 // the iterator should return. 112 il.append(SWAP); 113 il.append(new PUSH(cpg,_value)); 114 if (this instanceof IdPattern) 115 { 116 il.append(new INVOKEVIRTUAL(lookupId)); 117 } 118 else 119 { 120 il.append(new INVOKEVIRTUAL(lookupKey)); 121 } 122 123 _trueList.add(il.append(new IFNE(null))); 124 _falseList.add(il.append(new GOTO(null))); 125 } 126 127} 128