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.util;
23
24import com.sun.org.apache.bcel.internal.generic.ALOAD;
25import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
26import com.sun.org.apache.bcel.internal.generic.ILOAD;
27import com.sun.org.apache.bcel.internal.generic.ISTORE;
28import com.sun.org.apache.bcel.internal.generic.Instruction;
29import com.sun.org.apache.bcel.internal.generic.InstructionList;
30import com.sun.org.apache.bcel.internal.generic.Type;
31
32/**
33 * @author Jacek Ambroziak
34 * @author Santiago Pericas-Geertsen
35 */
36public final class MatchGenerator extends MethodGenerator {
37    private static int CURRENT_INDEX = 1;
38
39    private int _iteratorIndex = INVALID_INDEX;
40
41    private final Instruction _iloadCurrent;
42    private final Instruction _istoreCurrent;
43    private Instruction _aloadDom;
44
45    public MatchGenerator(int access_flags, Type return_type,
46                          Type[] arg_types, String[] arg_names,
47                          String method_name, String class_name,
48                          InstructionList il, ConstantPoolGen cp) {
49        super(access_flags, return_type, arg_types, arg_names, method_name,
50              class_name, il, cp);
51
52        _iloadCurrent = new ILOAD(CURRENT_INDEX);
53        _istoreCurrent = new ISTORE(CURRENT_INDEX);
54    }
55
56    public Instruction loadCurrentNode() {
57        return _iloadCurrent;
58    }
59
60    public Instruction storeCurrentNode() {
61        return _istoreCurrent;
62    }
63
64    public int getHandlerIndex() {
65        return INVALID_INDEX;           // not available
66    }
67
68    /**
69     * Get index of the register where the DOM is stored.
70     */
71    public Instruction loadDOM() {
72        return _aloadDom;
73    }
74
75    /**
76     * Set index where the reference to the DOM is stored.
77     */
78    public void setDomIndex(int domIndex) {
79        _aloadDom = new ALOAD(domIndex);
80    }
81
82    /**
83     * Get index of the register where the current iterator is stored.
84     */
85    public int getIteratorIndex() {
86        return _iteratorIndex;
87    }
88
89    /**
90     * Set index of the register where the current iterator is stored.
91     */
92    public void setIteratorIndex(int iteratorIndex) {
93        _iteratorIndex = iteratorIndex;
94    }
95
96    public int getLocalIndex(String name) {
97        if (name.equals("current")) {
98            return CURRENT_INDEX;
99        }
100        return super.getLocalIndex(name);
101    }
102}
103