/*
* Copyright (c) 2005, 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;
import static com.sun.tools.javac.code.TypeTags.*;
/**
* 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.tag) {
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.tag) {
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) + '"';
}
}