| /* |
| * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.tools.javac.util; |
| |
| import com.sun.tools.javac.code.Type; |
| |
| /** |
| * Utilities for operating on constant values. |
| * |
| * <p><b>This is NOT part of any supported API. |
| * If you write code that depends on this, you do so at your own risk. |
| * This code and its internal interfaces are subject to change or |
| * deletion without notice.</b> |
| */ |
| public class Constants { |
| |
| /** |
| * Converts a constant in internal representation (in which |
| * boolean, char, byte, short, and int are each represented by an |
| * Integer) into standard representation. Other values (including |
| * null) are returned unchanged. |
| */ |
| public static Object decode(Object value, Type type) { |
| if (value instanceof Integer) { |
| int i = (Integer) value; |
| switch (type.getTag()) { |
| case BOOLEAN: return i != 0; |
| case CHAR: return (char) i; |
| case BYTE: return (byte) i; |
| case SHORT: return (short) i; |
| } |
| } |
| return value; |
| } |
| |
| /** |
| * Returns a string representation of a constant value (given in |
| * internal representation), quoted and formatted as in Java source. |
| */ |
| public static String format(Object value, Type type) { |
| value = decode(value, type); |
| switch (type.getTag()) { |
| case BYTE: return formatByte((Byte) value); |
| case LONG: return formatLong((Long) value); |
| case FLOAT: return formatFloat((Float) value); |
| case DOUBLE: return formatDouble((Double) value); |
| case CHAR: return formatChar((Character) value); |
| } |
| if (value instanceof String) |
| return formatString((String) value); |
| return value + ""; |
| } |
| |
| /** |
| * Returns a string representation of a constant value (given in |
| * standard wrapped representation), quoted and formatted as in |
| * Java source. |
| */ |
| public static String format(Object value) { |
| if (value instanceof Byte) return formatByte((Byte) value); |
| if (value instanceof Short) return formatShort((Short) value); |
| if (value instanceof Long) return formatLong((Long) value); |
| if (value instanceof Float) return formatFloat((Float) value); |
| if (value instanceof Double) return formatDouble((Double) value); |
| if (value instanceof Character) return formatChar((Character) value); |
| if (value instanceof String) return formatString((String) value); |
| if (value instanceof Integer || |
| value instanceof Boolean) return value.toString(); |
| else |
| throw new IllegalArgumentException("Argument is not a primitive type or a string; it " + |
| ((value == null) ? |
| "is a null value." : |
| "has class " + |
| value.getClass().getName()) + "." ); |
| } |
| |
| private static String formatByte(byte b) { |
| return String.format("(byte)0x%02x", b); |
| } |
| |
| private static String formatShort(short s) { |
| return String.format("(short)%d", s); |
| } |
| |
| private static String formatLong(long lng) { |
| return lng + "L"; |
| } |
| |
| private static String formatFloat(float f) { |
| if (Float.isNaN(f)) |
| return "0.0f/0.0f"; |
| else if (Float.isInfinite(f)) |
| return (f < 0) ? "-1.0f/0.0f" : "1.0f/0.0f"; |
| else |
| return f + "f"; |
| } |
| |
| private static String formatDouble(double d) { |
| if (Double.isNaN(d)) |
| return "0.0/0.0"; |
| else if (Double.isInfinite(d)) |
| return (d < 0) ? "-1.0/0.0" : "1.0/0.0"; |
| else |
| return d + ""; |
| } |
| |
| private static String formatChar(char c) { |
| return '\'' + Convert.quote(c) + '\''; |
| } |
| |
| private static String formatString(String s) { |
| return '"' + Convert.quote(s) + '"'; |
| } |
| } |