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Java > Open Source Codes > com > go > trove > classfile > ConstantFieldInfo


1 /* ====================================================================
2  * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
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52
53 package com.go.trove.classfile;
54
55 import java.io.*;
56
57 /******************************************************************************
58  * This class corresponds to the CONSTANT_Fieldref_info structure as defined in
59  * section 4.4.2 of <i>The Java Virtual Machine Specification</i>.
60  *
61  * @author Brian S O'Neill
62  * @version
63  * <!--$$Revision:--> 21 <!-- $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
64  */

65 public class ConstantFieldInfo extends ConstantInfo {
66     private ConstantClassInfo mParentClass;
67     private ConstantNameAndTypeInfo mNameAndType;
68     
69     /**
70      * Will return either a new ConstantFieldInfo object or one already in
71      * the constant pool. If it is a new ConstantFieldInfo, it will be inserted
72      * into the pool.
73      */

74     static ConstantFieldInfo make(ConstantPool cp,
75                                   ConstantClassInfo parentClass,
76                                   ConstantNameAndTypeInfo nameAndType) {
77         ConstantInfo ci = new ConstantFieldInfo(parentClass, nameAndType);
78         return (ConstantFieldInfo)cp.addConstant(ci);
79     }
80     
81     ConstantFieldInfo(ConstantClassInfo parentClass,
82                       ConstantNameAndTypeInfo nameAndType) {
83         super(TAG_FIELD);
84         
85         mParentClass = parentClass;
86         mNameAndType = nameAndType;
87     }
88     
89     public ConstantClassInfo getParentClass() {
90         return mParentClass;
91     }
92     
93     public ConstantNameAndTypeInfo getNameAndType() {
94         return mNameAndType;
95     }
96
97     public int hashCode() {
98         return mNameAndType.hashCode();
99     }
100     
101     public boolean equals(Object JavaDoc obj) {
102         if (obj instanceof ConstantFieldInfo) {
103             ConstantFieldInfo other = (ConstantFieldInfo)obj;
104             return (mParentClass.equals(other.mParentClass) &&
105                     mNameAndType.equals(other.mNameAndType));
106         }
107         
108         return false;
109     }
110     
111     public void writeTo(DataOutput dout) throws IOException {
112         super.writeTo(dout);
113         dout.writeShort(mParentClass.getIndex());
114         dout.writeShort(mNameAndType.getIndex());
115     }
116
117     public String JavaDoc toString() {
118         StringBuffer JavaDoc buf = new StringBuffer JavaDoc("CONSTANT_Fieldref_info: ");
119
120         ConstantClassInfo parent = getParentClass();
121
122         buf.append(parent.getClassName());
123         for (int i = parent.getDimensions(); i > 0; i--) {
124             buf.append('[');
125             buf.append(']');
126         }
127
128         ConstantNameAndTypeInfo cnati = getNameAndType();
129
130         buf.append(' ');
131         buf.append(cnati.getName());
132         buf.append(' ');
133         buf.append(cnati.getType());
134
135         return buf.toString();
136     }
137 }
138
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