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


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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_NameAndType_info structure as defined
59  * in section 4.4.6 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 ConstantNameAndTypeInfo extends ConstantInfo {
66     private String JavaDoc mName;
67     private Descriptor mType;
68     
69     private ConstantUTFInfo mNameConstant;
70     private ConstantUTFInfo mDescriptorConstant;
71     
72     /**
73      * Will return either a new ConstantNameAndTypeInfo object or one
74      * already in the constant pool.
75      * If it is a new ConstantNameAndTypeInfo, it will be inserted
76      * into the pool.
77      */

78     static ConstantNameAndTypeInfo make(ConstantPool cp,
79                                         String JavaDoc name,
80                                         Descriptor type) {
81         ConstantInfo ci = new ConstantNameAndTypeInfo(cp, name, type);
82         return (ConstantNameAndTypeInfo)cp.addConstant(ci);
83     }
84     
85     ConstantNameAndTypeInfo(ConstantUTFInfo nameConstant,
86                             ConstantUTFInfo descConstant) {
87         super(TAG_NAME_AND_TYPE);
88         mNameConstant = nameConstant;
89         mDescriptorConstant = descConstant;
90
91         mName = nameConstant.getValue();
92         mType = Descriptor.parse(descConstant.getValue());
93     }
94
95     private ConstantNameAndTypeInfo(ConstantPool cp,
96                                     String JavaDoc name,
97                                     Descriptor type) {
98         super(TAG_NAME_AND_TYPE);
99         mName = name;
100         mType = type;
101         
102         mNameConstant = ConstantUTFInfo.make(cp, name);
103         mDescriptorConstant = ConstantUTFInfo.make(cp, mType.toString());
104     }
105     
106     public String JavaDoc getName() {
107         return mName;
108     }
109
110     public Descriptor getType() {
111         return mType;
112     }
113
114     public int hashCode() {
115         return mName.hashCode();
116     }
117     
118     public boolean equals(Object JavaDoc obj) {
119         if (obj instanceof ConstantNameAndTypeInfo) {
120             ConstantNameAndTypeInfo other = (ConstantNameAndTypeInfo)obj;
121             return mName.equals(other.mName) &&
122                 mType.toString().equals(other.mType.toString());
123         }
124         
125         return false;
126     }
127     
128     public void writeTo(DataOutput dout) throws IOException {
129         super.writeTo(dout);
130         dout.writeShort(mNameConstant.getIndex());
131         dout.writeShort(mDescriptorConstant.getIndex());
132     }
133
134     public String JavaDoc toString() {
135         return "CONSTANT_NameAndType_info: " + getName() + ", " + getType();
136     }
137 }
138
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