1   package org.apache.bcel.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 org.apache.bcel.classfile.ConstantPool;
58  import org.apache.bcel.classfile.ConstantUtf8;
59  import org.apache.bcel.classfile.ConstantNameAndType;
60  import org.apache.bcel.classfile.ConstantCP;
61  import org.apache.bcel.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 toString(ConstantPool cp) {
88      return org.apache.bcel.Constants.OPCODE_NAMES[opcode] + " " +
89        cp.constantToString(index, org.apache.bcel.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 getFieldName(ConstantPoolGen cpg) {
113     return getName(cpg);
114   }
115 }
116 
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