jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/util/Constants.java@4868a36f6fd8

     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 supported API.

    36  * If 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 }

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