001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 /*
019 * $Id: PositionCall.java 468650 2006-10-28 07:03:30Z minchau $
020 */
021
022 package org.apache.xalan.xsltc.compiler;
023
024 import org.apache.bcel.generic.ConstantPoolGen;
025 import org.apache.bcel.generic.ILOAD;
026 import org.apache.bcel.generic.INVOKEINTERFACE;
027 import org.apache.bcel.generic.InstructionList;
028 import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
029 import org.apache.xalan.xsltc.compiler.util.CompareGenerator;
030 import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
031 import org.apache.xalan.xsltc.compiler.util.TestGenerator;
032
033 /**
034 * @author Jacek Ambroziak
035 * @author Santiago Pericas-Geertsen
036 * @author Morten Jorgensen
037 */
038 final class PositionCall extends FunctionCall {
039
040 public PositionCall(QName fname) {
041 super(fname);
042 }
043
044 public boolean hasPositionCall() {
045 return true;
046 }
047
048 public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
049 final InstructionList il = methodGen.getInstructionList();
050
051 if (methodGen instanceof CompareGenerator) {
052 il.append(((CompareGenerator)methodGen).loadCurrentNode());
053 }
054 else if (methodGen instanceof TestGenerator) {
055 il.append(new ILOAD(POSITION_INDEX));
056 }
057 else {
058 final ConstantPoolGen cpg = classGen.getConstantPool();
059 final int index = cpg.addInterfaceMethodref(NODE_ITERATOR,
060 "getPosition",
061 "()I");
062
063 il.append(methodGen.loadIterator());
064 il.append(new INVOKEINTERFACE(index,1));
065 }
066 }
067 }