1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements.  See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License.  You may obtain a copy of the License at
8  *
9  *      http://www.apache.org/licenses/LICENSE-2.0
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  */
18 package org.apache.bcel.generic;
19 
20 /**
21  * LDC2_W - Push long or double from constant pool
22  *
23  * <PRE>Stack: ... -&gt; ..., item.word1, item.word2</PRE>
24  *
25  * @version $Id$
26  */
27 public class LDC2_W extends CPInstruction implements PushInstruction {
28 
29     /**
30      * Empty constructor needed for Instruction.readInstruction.
31      * Not to be used otherwise.
32      */
LDC2_W()33     LDC2_W() {
34     }
35 
36 
LDC2_W(final int index)37     public LDC2_W(final int index) {
38         super(org.apache.bcel.Const.LDC2_W, index);
39     }
40 
41 
42     @Override
getType( final ConstantPoolGen cpg )43     public Type getType( final ConstantPoolGen cpg ) {
44         switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) {
45             case org.apache.bcel.Const.CONSTANT_Long:
46                 return Type.LONG;
47             case org.apache.bcel.Const.CONSTANT_Double:
48                 return Type.DOUBLE;
49             default: // Never reached
50                 throw new RuntimeException("Unknown constant type " + super.getOpcode());
51         }
52     }
53 
54 
getValue( final ConstantPoolGen cpg )55     public Number getValue( final ConstantPoolGen cpg ) {
56         final org.apache.bcel.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex());
57         switch (c.getTag()) {
58             case org.apache.bcel.Const.CONSTANT_Long:
59                 return Long.valueOf(((org.apache.bcel.classfile.ConstantLong) c).getBytes());
60             case org.apache.bcel.Const.CONSTANT_Double:
61                 return new Double(((org.apache.bcel.classfile.ConstantDouble) c).getBytes());
62             default: // Never reached
63                 throw new RuntimeException("Unknown or invalid constant type at " + super.getIndex());
64         }
65     }
66 
67 
68     /**
69      * Call corresponding visitor method(s). The order is:
70      * Call visitor methods of implemented interfaces first, then
71      * call methods according to the class hierarchy in descending order,
72      * i.e., the most specific visitXXX() call comes last.
73      *
74      * @param v Visitor object
75      */
76     @Override
accept( final Visitor v )77     public void accept( final Visitor v ) {
78         v.visitStackProducer(this);
79         v.visitPushInstruction(this);
80         v.visitTypedInstruction(this);
81         v.visitCPInstruction(this);
82         v.visitLDC2_W(this);
83     }
84 }
85