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 LineNumber table Attribute
36: * of a method's code.
37: */
38:
39: public class LineNumberTableAttribute extends Attribute {
40: public LineNumberTableEntry data[];
41:
42: public LineNumberTableAttribute(UnicodeConstant name, int l,
43: LineNumberTableEntry d[]) {
44: super (name, l);
45: data = d;
46: }
47:
48: protected int writeData(DataOutput o) throws IOException {
49: int n = data.length;
50: o.writeShort(n);
51: for (int i = 0; i < n; i++) {
52: data[i].write(o);
53: }
54: return 2 + LineNumberTableEntry.size * n;
55: }
56:
57: public static Attribute readAttribute(DataInput i,
58: ConstantObject t[]) throws IOException {
59: UnicodeConstant name;
60:
61: name = (UnicodeConstant) t[i.readUnsignedShort()];
62: return finishReadAttribute(i, name);
63: }
64:
65: //
66: // for those cases where we already read the name index
67: // and know that its not something requiring special handling.
68: //
69: public static Attribute finishReadAttribute(DataInput in,
70: UnicodeConstant name) throws IOException {
71: int l;
72: int n;
73: LineNumberTableEntry d[];
74:
75: l = in.readInt();
76: n = in.readUnsignedShort();
77: d = new LineNumberTableEntry[n];
78: for (int i = 0; i < n; i++) {
79: d[i] = new LineNumberTableEntry(in.readUnsignedShort(), in
80: .readUnsignedShort());
81: }
82: return new LineNumberTableAttribute(name, l, d);
83: }
84:
85: }
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