| 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 | } |