jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/util/Constants.java@9a66ca7c79fa

     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  */

    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 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     }

    94     private static String formatByte(byte b) {

    95         return String.format("0x%02x", b);

    96     }

    98     private static String formatLong(long lng) {

    99         return lng + "L";

   100     }

   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     }

   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     }

   120     private static String formatChar(char c) {

   121         return '\'' + Convert.quote(c) + '\'';

   122     }

   124     private static String formatString(String s) {

   125         return '"' + Convert.quote(s) + '"';

   126     }

   127 }

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