01: /*
02: * Copyright 1994-2003 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun in the LICENSE file that accompanied this code.
10: *
11: * This code is distributed in the hope that it will be useful, but WITHOUT
12: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14: * version 2 for more details (a copy is included in the LICENSE file that
15: * accompanied this code).
16: *
17: * You should have received a copy of the GNU General Public License version
18: * 2 along with this work; if not, write to the Free Software Foundation,
19: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20: *
21: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: package sun.tools.asm;
27:
28: import sun.tools.java.*;
29: import java.io.IOException;
30: import java.io.DataOutputStream;
31:
32: /**
33: * A numeric constant pool item. Can either be integer, float, long or double.
34: *
35: * WARNING: The contents of this source file are not part of any
36: * supported API. Code that depends on them does so at its own risk:
37: * they are subject to change or removal without notice.
38: */
39: final class NumberConstantData extends ConstantPoolData {
40: Number num;
41:
42: /**
43: * Constructor
44: */
45: NumberConstantData(ConstantPool tab, Number num) {
46: this .num = num;
47: }
48:
49: /**
50: * Write the constant to the output stream
51: */
52: void write(Environment env, DataOutputStream out, ConstantPool tab)
53: throws IOException {
54: if (num instanceof Integer) {
55: out.writeByte(CONSTANT_INTEGER);
56: out.writeInt(num.intValue());
57: } else if (num instanceof Long) {
58: out.writeByte(CONSTANT_LONG);
59: out.writeLong(num.longValue());
60: } else if (num instanceof Float) {
61: out.writeByte(CONSTANT_FLOAT);
62: out.writeFloat(num.floatValue());
63: } else if (num instanceof Double) {
64: out.writeByte(CONSTANT_DOUBLE);
65: out.writeDouble(num.doubleValue());
66: }
67: }
68:
69: /**
70: * Return the order of the constant
71: */
72: int order() {
73: return (width() == 1) ? 0 : 3;
74: }
75:
76: /**
77: * Return the number of entries that it takes up in the constant pool
78: */
79: int width() {
80: return ((num instanceof Double) || (num instanceof Long)) ? 2
81: : 1;
82: }
83: }
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