| /* |
| * 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.ConstantPoolGen; |
| import org.apache.bcel.generic.GOTO; |
| import org.apache.bcel.generic.IFNE; |
| import org.apache.bcel.generic.INVOKEINTERFACE; |
| import org.apache.bcel.generic.INVOKEVIRTUAL; |
| import org.apache.bcel.generic.InstructionList; |
| import org.apache.bcel.generic.PUSH; |
| import org.apache.xalan.xsltc.compiler.util.ClassGenerator; |
| import org.apache.xalan.xsltc.compiler.util.MethodGenerator; |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| import org.apache.xalan.xsltc.compiler.util.TypeCheckError; |
| |
| /** |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| */ |
| abstract class IdKeyPattern extends LocationPathPattern { |
| |
| protected RelativePathPattern _left = null;; |
| private String _index = null; |
| private String _value = null;; |
| |
| public IdKeyPattern(String index, String value) { |
| _index = index; |
| _value = value; |
| } |
| |
| public String getIndexName() { |
| return(_index); |
| } |
| |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| return Type.NodeSet; |
| } |
| |
| public boolean isWildcard() { |
| return false; |
| } |
| |
| public void setLeft(RelativePathPattern left) { |
| _left = left; |
| } |
| |
| public StepPattern getKernelPattern() { |
| return(null); |
| } |
| |
| public void reduceKernelPattern() { } |
| |
| public String toString() { |
| return "id/keyPattern(" + _index + ", " + _value + ')'; |
| } |
| |
| /** |
| * This method is called when the constructor is compiled in |
| * Stylesheet.compileConstructor() and not as the syntax tree is traversed. |
| */ |
| public void translate(ClassGenerator classGen, |
| MethodGenerator methodGen) { |
| |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| |
| // Returns the KeyIndex object of a given name |
| final int getKeyIndex = cpg.addMethodref(TRANSLET_CLASS, |
| "getKeyIndex", |
| "(Ljava/lang/String;)"+ |
| KEY_INDEX_SIG); |
| |
| // Initialises a KeyIndex to return nodes with specific values |
| final int lookupId = cpg.addMethodref(KEY_INDEX_CLASS, |
| "containsID", |
| "(ILjava/lang/Object;)I"); |
| final int lookupKey = cpg.addMethodref(KEY_INDEX_CLASS, |
| "containsKey", |
| "(ILjava/lang/Object;)I"); |
| final int getNodeIdent = cpg.addInterfaceMethodref(DOM_INTF, |
| "getNodeIdent", |
| "(I)"+NODE_SIG); |
| |
| // Call getKeyIndex in AbstractTranslet with the name of the key |
| // to get the index for this key (which is also a node iterator). |
| il.append(classGen.loadTranslet()); |
| il.append(new PUSH(cpg,_index)); |
| il.append(new INVOKEVIRTUAL(getKeyIndex)); |
| |
| // Now use the value in the second argument to determine what nodes |
| // the iterator should return. |
| il.append(SWAP); |
| il.append(new PUSH(cpg,_value)); |
| if (this instanceof IdPattern) |
| { |
| il.append(new INVOKEVIRTUAL(lookupId)); |
| } |
| else |
| { |
| il.append(new INVOKEVIRTUAL(lookupKey)); |
| } |
| |
| _trueList.add(il.append(new IFNE(null))); |
| _falseList.add(il.append(new GOTO(null))); |
| } |
| |
| } |
| |