Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/util/Constants.java@c002fdee76fd
src/share/classes/com/sun/tools/javac/util/Constants.java
Thu, 25 Oct 2012 11:09:36 -0700
- author
- jjg
- date
- Thu, 25 Oct 2012 11:09:36 -0700
- changeset 1374
- c002fdee76fd
- parent 581
- f2fdd52e4e87
- child 2525
- 2eb010b6cb22
- permissions
- -rw-r--r--
7200915: convert TypeTags from a series of small ints to an enum
Reviewed-by: jjg, mcimadamore
Contributed-by: vicente.romero@oracle.com
1 /*
2 * Copyright (c) 2005, 2012, 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 */
26 package com.sun.tools.javac.util;
28 import com.sun.tools.javac.code.Type;
30 /**
31 * Utilities for operating on constant values.
32 *
33 * <p><b>This is NOT part of any supported API.
34 * If you write code that depends on this, you do so at your own risk.
35 * This code and its internal interfaces are subject to change or
36 * deletion without notice.</b>
37 */
38 public class Constants {
40 /**
41 * Converts a constant in internal representation (in which
42 * boolean, char, byte, short, and int are each represented by an
43 * Integer) into standard representation. Other values (including
44 * null) are returned unchanged.
45 */
46 public static Object decode(Object value, Type type) {
47 if (value instanceof Integer) {
48 int i = (Integer) value;
49 switch (type.getTag()) {
50 case BOOLEAN: return i != 0;
51 case CHAR: return (char) i;
52 case BYTE: return (byte) i;
53 case SHORT: return (short) i;
54 }
55 }
56 return value;
57 }
59 /**
60 * Returns a string representation of a constant value (given in
61 * internal representation), quoted and formatted as in Java source.
62 */
63 public static String format(Object value, Type type) {
64 value = decode(value, type);
65 switch (type.getTag()) {
66 case BYTE: return formatByte((Byte) value);
67 case LONG: return formatLong((Long) value);
68 case FLOAT: return formatFloat((Float) value);
69 case DOUBLE: return formatDouble((Double) value);
70 case CHAR: return formatChar((Character) value);
71 }
72 if (value instanceof String)
73 return formatString((String) value);
74 return value + "";
75 }
77 /**
78 * Returns a string representation of a constant value (given in
79 * standard wrapped representation), quoted and formatted as in
80 * Java source.
81 */
82 public static String format(Object value) {
83 if (value instanceof Byte) return formatByte((Byte) value);
84 if (value instanceof Short) return formatShort((Short) value);
85 if (value instanceof Long) return formatLong((Long) value);
86 if (value instanceof Float) return formatFloat((Float) value);
87 if (value instanceof Double) return formatDouble((Double) value);
88 if (value instanceof Character) return formatChar((Character) value);
89 if (value instanceof String) return formatString((String) value);
90 if (value instanceof Integer ||
91 value instanceof Boolean) return value.toString();
92 else
93 throw new IllegalArgumentException("Argument is not a primitive type or a string; it " +
94 ((value == null) ?
95 "is a null value." :
96 "has class " +
97 value.getClass().getName()) + "." );
98 }
100 private static String formatByte(byte b) {
101 return String.format("(byte)0x%02x", b);
102 }
104 private static String formatShort(short s) {
105 return String.format("(short)%d", s);
106 }
108 private static String formatLong(long lng) {
109 return lng + "L";
110 }
112 private static String formatFloat(float f) {
113 if (Float.isNaN(f))
114 return "0.0f/0.0f";
115 else if (Float.isInfinite(f))
116 return (f < 0) ? "-1.0f/0.0f" : "1.0f/0.0f";
117 else
118 return f + "f";
119 }
121 private static String formatDouble(double d) {
122 if (Double.isNaN(d))
123 return "0.0/0.0";
124 else if (Double.isInfinite(d))
125 return (d < 0) ? "-1.0/0.0" : "1.0/0.0";
126 else
127 return d + "";
128 }
130 private static String formatChar(char c) {
131 return '\'' + Convert.quote(c) + '\'';
132 }
134 private static String formatString(String s) {
135 return '"' + Convert.quote(s) + '"';
136 }
137 }
