Thu, 10 Jun 2010 09:29:23 +0100
6945418: Project Coin: Simplified Varargs Method Invocation
Summary: Add new mandatory warning for unsafe vararg method declaration. Warning can be suppressed as usual (@SuppressWarnings("varargs")/-Xlint:-varargs)
Reviewed-by: jjg, darcy
1 /*
2 * Copyright (c) 2005, 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 import static com.sun.tools.javac.code.TypeTags.*;
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 {
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 }
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 }
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 Short) return formatShort((Short) value);
87 if (value instanceof Long) return formatLong((Long) value);
88 if (value instanceof Float) return formatFloat((Float) value);
89 if (value instanceof Double) return formatDouble((Double) value);
90 if (value instanceof Character) return formatChar((Character) value);
91 if (value instanceof String) return formatString((String) value);
92 if (value instanceof Integer ||
93 value instanceof Boolean) return value.toString();
94 else
95 throw new IllegalArgumentException("Argument is not a primitive type or a string; it " +
96 ((value == null) ?
97 "is a null value." :
98 "has class " +
99 value.getClass().getName()) + "." );
100 }
102 private static String formatByte(byte b) {
103 return String.format("(byte)0x%02x", b);
104 }
106 private static String formatShort(short s) {
107 return String.format("(short)%d", s);
108 }
110 private static String formatLong(long lng) {
111 return lng + "L";
112 }
114 private static String formatFloat(float f) {
115 if (Float.isNaN(f))
116 return "0.0f/0.0f";
117 else if (Float.isInfinite(f))
118 return (f < 0) ? "-1.0f/0.0f" : "1.0f/0.0f";
119 else
120 return f + "f";
121 }
123 private static String formatDouble(double d) {
124 if (Double.isNaN(d))
125 return "0.0/0.0";
126 else if (Double.isInfinite(d))
127 return (d < 0) ? "-1.0/0.0" : "1.0/0.0";
128 else
129 return d + "";
130 }
132 private static String formatChar(char c) {
133 return '\'' + Convert.quote(c) + '\'';
134 }
136 private static String formatString(String s) {
137 return '"' + Convert.quote(s) + '"';
138 }
139 }