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: NamedMethodGenerator.java 468649 2006-10-28 07:00:55Z minchau $
020     */
021    
022    package org.apache.xalan.xsltc.compiler.util;
023    
024    import org.apache.bcel.generic.ALOAD;
025    import org.apache.bcel.generic.ASTORE;
026    import org.apache.bcel.generic.ConstantPoolGen;
027    import org.apache.bcel.generic.Instruction;
028    import org.apache.bcel.generic.InstructionList;
029    import org.apache.bcel.generic.Type;
030    
031    /**
032     * This class is used for named templates. Named template methods have access
033     * to the DOM, the current iterator, the handler and the current node.
034     * @author Jacek Ambroziak
035     * @author Santiago Pericas-Geertsen
036     */
037    public final class NamedMethodGenerator extends MethodGenerator {
038        protected static final int CURRENT_INDEX  = 4;
039        
040        // The index of the first parameter (after dom/iterator/handler/current)
041        private static final int PARAM_START_INDEX = 5;
042    
043        public NamedMethodGenerator(int access_flags, Type return_type,
044                                    Type[] arg_types, String[] arg_names,
045                                    String method_name, String class_name,
046                                    InstructionList il, ConstantPoolGen cp) {
047            super(access_flags, return_type, arg_types, arg_names, method_name, 
048                  class_name, il, cp);
049        }
050    
051        public int getLocalIndex(String name) {
052            if (name.equals("current")) {
053                return CURRENT_INDEX;
054            }
055            return super.getLocalIndex(name);
056        }
057    
058        public Instruction loadParameter(int index) {
059            return new ALOAD(index + PARAM_START_INDEX);
060        }
061        
062        public Instruction storeParameter(int index) {
063            return new ASTORE(index + PARAM_START_INDEX);
064        }
065    }