|
1
4 package gnu.bytecode;
5 import java.io.*;
6
7
8
11
12 public class ConstantValueAttr extends Attribute
13 {
14 Object  value;
15 int value_index;
16
17 public Object getValue(ConstantPool cpool)
18 {
19 if (value != null)
20 return value;
21 CpoolEntry entry = cpool.getPoolEntry(value_index);
22 switch (entry.getTag())
23 {
24 case ConstantPool.STRING:
25 value = ((CpoolString) entry).getString().getString();
26 break;
27 case ConstantPool.INTEGER:
28 value = new Integer (((CpoolValue1) entry).value);
29 break;
30 case ConstantPool.LONG:
31 value = new Long (((CpoolValue2) entry).value);
32 break;
33 case ConstantPool.FLOAT:
34 float f = Float.intBitsToFloat(((CpoolValue1) entry).value);
35 value = new Float (f);
36 break;
37 case ConstantPool.DOUBLE:
38 double d = Double.longBitsToDouble(((CpoolValue2) entry).value);
39 value = new Double (d);
40 break;
41 }
42 return value;
43 }
44
45 public ConstantValueAttr (Object value)
46 {
47 super("ConstantValue");
48 this.value = value;
49 }
50
51 public ConstantValueAttr (int index)
52 {
53 super("ConstantValue");
54 this.value_index = index;
55 }
56
57 public void assignConstants (ClassType cl)
58 {
59 super.assignConstants(cl);
60 if (value_index == 0)
61 {
62 ConstantPool cpool = cl.getConstants();
63 CpoolEntry entry = null;
64 if (value instanceof String )
65 entry = cpool.addString((String ) value);
66 else if (value instanceof Integer )
67 entry = cpool.addInt(((Integer ) value).intValue());
68 else if (value instanceof Long )
69 entry = cpool.addLong(((Long ) value).longValue());
70 else if (value instanceof Float )
71 entry = cpool.addFloat(((Float ) value).floatValue());
72 else if (value instanceof Long )
73 entry = cpool.addDouble(((Double ) value).doubleValue());
74 value_index = entry.getIndex();
75 }
76 }
77
78 public final int getLength() { return 2; }
79
80 public void write (DataOutputStream dstr) throws java.io.IOException
81 {
82 dstr.writeShort(value_index);
83 }
84
85 public void print (ClassTypeWriter dst)
86 {
87 dst.print("Attribute \"");
88 dst.print(getName());
89 dst.print("\", length:");
90 dst.print(getLength());
91 dst.print(", value: ");
92 if (value_index == 0)
93 {
94 Object value = getValue(dst.ctype.constants);
95 if (value instanceof String )
96 dst.printQuotedString((String ) value);
97 else
98 dst.print(value);
99 }
100 else
101 {
102 if (dst.printConstants)
103 {
104 dst.print(value_index);
105 dst.print('=');
106 }
107 CpoolEntry entry = dst.ctype.constants.getPoolEntry(value_index);
108 entry.print(dst, 1);
109 }
110 dst.println();
111 }
112 }
113 |
Popular Tags |
Java API By Example, From Geeks To Geeks.