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1
7
8 package org.gjt.jclasslib.structures;
9
10 import org.gjt.jclasslib.structures.constants.*;
11
12 import java.io.DataInput  ;
13 import java.io.IOException ;
14
15
21 public abstract class CPInfo extends AbstractStructure {
22
23 public static final byte CONSTANT_CLASS = 7;
24 public static final byte CONSTANT_FIELDREF = 9;
25 public static final byte CONSTANT_METHODREF = 10;
26 public static final byte CONSTANT_INTERFACE_METHODREF = 11;
27 public static final byte CONSTANT_STRING = 8;
28 public static final byte CONSTANT_INTEGER = 3;
29 public static final byte CONSTANT_FLOAT = 4;
30 public static final byte CONSTANT_LONG = 5;
31 public static final byte CONSTANT_DOUBLE = 6;
32 public static final byte CONSTANT_NAME_AND_TYPE = 12;
33 public static final byte CONSTANT_UTF8 = 1;
34
35 public static final String CONSTANT_CLASS_VERBOSE = "CONSTANT_Class_info";
36 public static final String CONSTANT_FIELDREF_VERBOSE = "CONSTANT_Fieldref_info";
37 public static final String CONSTANT_METHODREF_VERBOSE = "CONSTANT_Methodref_info";
38 public static final String CONSTANT_INTERFACE_METHODREF_VERBOSE = "CONSTANT_InterfaceMethodref_info";
39 public static final String CONSTANT_STRING_VERBOSE = "CONSTANT_String_info";
40 public static final String CONSTANT_INTEGER_VERBOSE = "CONSTANT_Integer_info";
41 public static final String CONSTANT_FLOAT_VERBOSE = "CONSTANT_Float_info";
42 public static final String CONSTANT_LONG_VERBOSE = "CONSTANT_Long_info";
43 public static final String CONSTANT_DOUBLE_VERBOSE = "CONSTANT_Double_info";
44 public static final String CONSTANT_NAME_AND_TYPE_VERBOSE = "CONSTANT_NameAndType_info";
45 public static final String CONSTANT_UTF8_VERBOSE = "CONSTANT_Utf8_info";
46
47
58 public static CPInfo create(DataInput in, ClassFile classFile)
59 throws InvalidByteCodeException, IOException {
60
61 CPInfo cpInfo;
62
63 byte tag = in.readByte();
64
65 switch (tag) {
66 case CONSTANT_CLASS:
67 cpInfo = new ConstantClassInfo();
68 break;
69 case CONSTANT_FIELDREF:
70 cpInfo = new ConstantFieldrefInfo();
71 break;
72 case CONSTANT_METHODREF:
73 cpInfo = new ConstantMethodrefInfo();
74 break;
75 case CONSTANT_INTERFACE_METHODREF:
76 cpInfo = new ConstantInterfaceMethodrefInfo();
77 break;
78 case CONSTANT_STRING:
79 cpInfo = new ConstantStringInfo();
80 break;
81 case CONSTANT_INTEGER:
82 cpInfo = new ConstantIntegerInfo();
83 break;
84 case CONSTANT_FLOAT:
85 cpInfo = new ConstantFloatInfo();
86 break;
87 case CONSTANT_LONG:
88 cpInfo = new ConstantLongInfo();
89 break;
90 case CONSTANT_DOUBLE:
91 cpInfo = new ConstantDoubleInfo();
92 break;
93 case CONSTANT_NAME_AND_TYPE:
94 cpInfo = new ConstantNameAndTypeInfo();
95 break;
96 case CONSTANT_UTF8:
97 cpInfo = new ConstantUtf8Info();
98 break;
99 default:
100 throw new InvalidByteCodeException("invalid constant pool entry with unknown tag " + tag);
101 }
102 cpInfo.setClassFile(classFile);
103 cpInfo.read(in);
104
105 return cpInfo;
106 }
107
108
109
114 public abstract byte getTag();
115
116
122 public abstract String getTagVerbose();
123
124
130 public String getVerbose() throws InvalidByteCodeException {
131 return "";
132 }
133
134
142 public static int skip(DataInput in)
143 throws InvalidByteCodeException, IOException {
144
145 int offset = 0;
146
147 byte tag = in.readByte();
148
149 switch (tag) {
150 case CONSTANT_CLASS:
151 in.skipBytes(ConstantClassInfo.SIZE);
152 break;
153 case CONSTANT_FIELDREF:
154 case CONSTANT_METHODREF:
155 case CONSTANT_INTERFACE_METHODREF:
156 in.skipBytes(ConstantReference.SIZE);
157 break;
158 case CONSTANT_STRING:
159 in.skipBytes(ConstantStringInfo.SIZE);
160 break;
161 case CONSTANT_INTEGER:
162 case CONSTANT_FLOAT:
163 in.skipBytes(ConstantNumeric.SIZE);
164 break;
165 case CONSTANT_LONG:
166 case CONSTANT_DOUBLE:
167 in.skipBytes(ConstantLargeNumeric.SIZE);
168 offset = 1;
169 break;
170 case CONSTANT_NAME_AND_TYPE:
171 in.skipBytes(ConstantNameAndTypeInfo.SIZE);
172 break;
173 case CONSTANT_UTF8:
174 in.skipBytes(in.readUnsignedShort());
176 break;
177 default:
178 throw new InvalidByteCodeException("invalid constant pool entry with unknown tag " + tag);
179 }
180
181 return offset;
182 }
183
184 public boolean equals(Object object) {
185 return object instanceof CPInfo;
186 }
187
188 public int hashCode() {
189 return 0;
190 }
191
192 protected String printAccessFlagsVerbose(int accessFlags) {
193 if (accessFlags != 0)
194 throw new RuntimeException ("Access flags should be zero: " + Integer.toHexString(accessFlags));
195 return "";
196 }
197 }
198 |
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