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