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Java > Open Source Codes > org > apache > bcel > generic > FieldInstruction


1 /*
2  * Copyright 2000-2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package org.apache.bcel.generic;
18
19 import org.apache.bcel.classfile.ConstantPool;
20
21 /**
22  * Super class for the GET/PUTxxx family of instructions.
23  *
24  * @version $Id: FieldInstruction.java 386056 2006-03-15 11:31:56Z tcurdt $
25  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
26  */
27 public abstract class FieldInstruction extends FieldOrMethod implements TypedInstruction {
28
29     /**
30      * Empty constructor needed for the Class.newInstance() statement in
31      * Instruction.readInstruction(). Not to be used otherwise.
32      */
33     FieldInstruction() {
34     }
35
36
37     /**
38      * @param index to constant pool
39      */
40     protected FieldInstruction(short opcode, int index) {
41         super(opcode, index);
42     }
43
44
45     /**
46      * @return mnemonic for instruction with symbolic references resolved
47      */
48     public String JavaDoc toString( ConstantPool cp ) {
49         return org.apache.bcel.Constants.OPCODE_NAMES[opcode] + " "
50                 + cp.constantToString(index, org.apache.bcel.Constants.CONSTANT_Fieldref);
51     }
52
53
54     /** @return size of field (1 or 2)
55      */
56     protected int getFieldSize( ConstantPoolGen cpg ) {
57         return getType(cpg).getSize();
58     }
59
60
61     /** @return return type of referenced field
62      */
63     public Type getType( ConstantPoolGen cpg ) {
64         return getFieldType(cpg);
65     }
66
67
68     /** @return type of field
69      */
70     public Type getFieldType( ConstantPoolGen cpg ) {
71         return Type.getType(getSignature(cpg));
72     }
73
74
75     /** @return name of referenced field.
76      */
77     public String JavaDoc getFieldName( ConstantPoolGen cpg ) {
78         return getName(cpg);
79     }
80 }
81
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