1/*
2 * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.tools.asm;
27
28import sun.tools.java.*;
29import java.io.IOException;
30import 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 */
39final
40class NumberConstantData extends ConstantPoolData {
41    Number num;
42
43    /**
44     * Constructor
45     */
46    NumberConstantData(ConstantPool tab, Number num) {
47        this.num = num;
48    }
49
50    /**
51     * Write the constant to the output stream
52     */
53    void write(Environment env, DataOutputStream out, ConstantPool tab) 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     * Return the order of the constant
70     */
71    int order() {
72        return (width() == 1) ? 0 : 3;
73    }
74
75    /**
76     * Return the number of entries that it takes up in the constant pool
77     */
78    int width() {
79        return ((num instanceof Double) || (num instanceof Long)) ? 2 : 1;
80    }
81}
82