1 | /* |
2 | * Copyright 2005 Sun Microsystems, Inc. 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. Sun designates this |
8 | * particular file as subject to the "Classpath" exception as provided |
9 | * 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 com.sun.tools.javac.util; |
27 | |
28 | import com.sun.tools.javac.code.Type; |
29 | |
30 | import static com.sun.tools.javac.code.TypeTags.*; |
31 | |
32 | /** |
33 | * Utilities for operating on constant values. |
34 | * |
35 | * <p><b>This is NOT part of any API supported by Sun Microsystems. If |
36 | * you write code that depends on this, you do so at your own risk. |
37 | * This code and its internal interfaces are subject to change or |
38 | * deletion without notice.</b> |
39 | */ |
40 | public class Constants { |
41 | |
42 | /** |
43 | * Converts a constant in internal representation (in which |
44 | * boolean, char, byte, short, and int are each represented by an |
45 | * Integer) into standard representation. Other values (including |
46 | * null) are returned unchanged. |
47 | */ |
48 | public static Object decode(Object value, Type type) { |
49 | if (value instanceof Integer) { |
50 | int i = (Integer) value; |
51 | switch (type.tag) { |
52 | case BOOLEAN: return i != 0; |
53 | case CHAR: return (char) i; |
54 | case BYTE: return (byte) i; |
55 | case SHORT: return (short) i; |
56 | } |
57 | } |
58 | return value; |
59 | } |
60 | |
61 | /** |
62 | * Returns a string representation of a constant value (given in |
63 | * internal representation), quoted and formatted as in Java source. |
64 | */ |
65 | public static String format(Object value, Type type) { |
66 | value = decode(value, type); |
67 | switch (type.tag) { |
68 | case BYTE: return formatByte((Byte) value); |
69 | case LONG: return formatLong((Long) value); |
70 | case FLOAT: return formatFloat((Float) value); |
71 | case DOUBLE: return formatDouble((Double) value); |
72 | case CHAR: return formatChar((Character) value); |
73 | } |
74 | if (value instanceof String) |
75 | return formatString((String) value); |
76 | return value + ""; |
77 | } |
78 | |
79 | /** |
80 | * Returns a string representation of a constant value (given in |
81 | * standard wrapped representation), quoted and formatted as in |
82 | * Java source. |
83 | */ |
84 | public static String format(Object value) { |
85 | if (value instanceof Byte) return formatByte((Byte) value); |
86 | if (value instanceof Long) return formatLong((Long) value); |
87 | if (value instanceof Float) return formatFloat((Float) value); |
88 | if (value instanceof Double) return formatDouble((Double) value); |
89 | if (value instanceof Character) return formatChar((Character) value); |
90 | if (value instanceof String) return formatString((String) value); |
91 | return value + ""; |
92 | } |
93 | |
94 | private static String formatByte(byte b) { |
95 | return String.format("0x%02x", b); |
96 | } |
97 | |
98 | private static String formatLong(long lng) { |
99 | return lng + "L"; |
100 | } |
101 | |
102 | private static String formatFloat(float f) { |
103 | if (Float.isNaN(f)) |
104 | return "0.0f/0.0f"; |
105 | else if (Float.isInfinite(f)) |
106 | return (f < 0) ? "-1.0f/0.0f" : "1.0f/0.0f"; |
107 | else |
108 | return f + "f"; |
109 | } |
110 | |
111 | private static String formatDouble(double d) { |
112 | if (Double.isNaN(d)) |
113 | return "0.0/0.0"; |
114 | else if (Double.isInfinite(d)) |
115 | return (d < 0) ? "-1.0/0.0" : "1.0/0.0"; |
116 | else |
117 | return d + ""; |
118 | } |
119 | |
120 | private static String formatChar(char c) { |
121 | return '\'' + Convert.quote(c) + '\''; |
122 | } |
123 | |
124 | private static String formatString(String s) { |
125 | return '"' + Convert.quote(s) + '"'; |
126 | } |
127 | } |