01: /*
02: *
03: *
04: * Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: */
26:
27: package components;
28:
29: import java.io.DataOutput;
30: import java.io.DataInput;
31: import java.io.IOException;
32: import util.DataFormatException;
33:
34: /*
35: * A class to represent the ConstantValue Attribute
36: * of a field
37: */
38:
39: public class ConstantValueAttribute extends Attribute {
40: public ConstantObject data;
41:
42: public ConstantValueAttribute(UnicodeConstant name, int l,
43: ConstantObject d) {
44: super (name, l);
45: data = d;
46: }
47:
48: public void externalize(ConstantPool p) {
49: super .externalize(p);
50: data = p.dup(data);
51: }
52:
53: protected int writeData(DataOutput o) throws IOException {
54: o.writeShort(data.index);
55: return 2;
56: }
57:
58: public void countConstantReferences(boolean isRelocatable) {
59: super .countConstantReferences(isRelocatable);
60: data.incReference();
61: }
62:
63: public static Attribute readAttribute(DataInput i,
64: ConstantObject globals[]) throws IOException {
65: UnicodeConstant name;
66:
67: name = (UnicodeConstant) globals[i.readUnsignedShort()];
68: return finishReadAttribute(i, name, globals);
69: }
70:
71: //
72: // for those cases where we already read the name index
73: // and know that its not something requiring special handling.
74: //
75: public static Attribute finishReadAttribute(DataInput i,
76: UnicodeConstant name, ConstantObject globals[])
77: throws IOException {
78: int l;
79: int n;
80: ConstantObject d;
81:
82: l = i.readInt();
83: n = i.readUnsignedShort();
84: d = globals[n];
85: return new ConstantValueAttribute(name, l, d);
86: }
87:
88: }
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