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Java > Open Source Codes > com > sun > org > apache > bcel > internal > generic > FieldInstruction


1 package com.sun.org.apache.bcel.internal.generic;
2
3 /* ====================================================================
4  * The Apache Software License, Version 1.1
5  *
6  * Copyright (c) 2001 The Apache Software Foundation. All rights
7  * reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution,
22  * if any, must include the following acknowledgment:
23  * "This product includes software developed by the
24  * Apache Software Foundation (http://www.apache.org/)."
25  * Alternately, this acknowledgment may appear in the software itself,
26  * if and wherever such third-party acknowledgments normally appear.
27  *
28  * 4. The names "Apache" and "Apache Software Foundation" and
29  * "Apache BCEL" must not be used to endorse or promote products
30  * derived from this software without prior written permission. For
31  * written permission, please contact apache@apache.org.
32  *
33  * 5. Products derived from this software may not be called "Apache",
34  * "Apache BCEL", nor may "Apache" appear in their name, without
35  * prior written permission of the Apache Software Foundation.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
49  * ====================================================================
50  *
51  * This software consists of voluntary contributions made by many
52  * individuals on behalf of the Apache Software Foundation. For more
53  * information on the Apache Software Foundation, please see
54  * <http://www.apache.org/>.
55  */
56
57 import com.sun.org.apache.bcel.internal.classfile.ConstantPool;
58 import com.sun.org.apache.bcel.internal.classfile.ConstantUtf8;
59 import com.sun.org.apache.bcel.internal.classfile.ConstantNameAndType;
60 import com.sun.org.apache.bcel.internal.classfile.ConstantCP;
61 import com.sun.org.apache.bcel.internal.classfile.*;
62
63 /**
64  * Super class for the GET/PUTxxx family of instructions.
65  *
66  * @version $Id: FieldInstruction.java,v 1.1.1.1 2001/10/29 20:00:12 jvanzyl Exp $
67  * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
68  */
69 public abstract class FieldInstruction extends FieldOrMethod
70   implements TypedInstruction {
71   /**
72    * Empty constructor needed for the Class.newInstance() statement in
73    * Instruction.readInstruction(). Not to be used otherwise.
74    */
75   FieldInstruction() {}
76
77   /**
78    * @param index to constant pool
79    */
80   protected FieldInstruction(short opcode, int index) {
81     super(opcode, index);
82   }
83
84   /**
85    * @return mnemonic for instruction with symbolic references resolved
86    */
87   public String JavaDoc toString(ConstantPool cp) {
88     return com.sun.org.apache.bcel.internal.Constants.OPCODE_NAMES[opcode] + " " +
89       cp.constantToString(index, com.sun.org.apache.bcel.internal.Constants.CONSTANT_Fieldref);
90   }
91   
92   /** @return size of field (1 or 2)
93    */
94   protected int getFieldSize(ConstantPoolGen cpg) {
95     return getType(cpg).getSize();
96   }
97
98   /** @return return type of referenced field
99    */
100   public Type getType(ConstantPoolGen cpg) {
101     return getFieldType(cpg);
102   }
103
104   /** @return type of field
105    */
106   public Type getFieldType(ConstantPoolGen cpg) {
107     return Type.getType(getSignature(cpg));
108   }
109
110   /** @return name of referenced field.
111    */
112   public String JavaDoc getFieldName(ConstantPoolGen cpg) {
113     return getName(cpg);
114   }
115 }
116
117
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