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src/share/classes/com/sun/tools/javac/util/Constants.java@93012e2a5d1d (annotated)

src/share/classes/com/sun/tools/javac/util/Constants.java

Sat, 07 Nov 2020 10:30:02 +0800

author

aoqi

date

Sat, 07 Nov 2020 10:30:02 +0800

changeset 3938

93012e2a5d1d

parent 2525

2eb010b6cb22

permissions

-rw-r--r--

Added tag mips-jdk8u275-b01 for changeset eb6ee6a5f2fe

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	package com.sun.tools.javac.util;
aoqi@0	27
aoqi@0	28	import com.sun.tools.javac.code.Type;
aoqi@0	29
aoqi@0	30	/**
aoqi@0	31	* Utilities for operating on constant values.
aoqi@0	32	*
aoqi@0	33	* <p><b>This is NOT part of any supported API.
aoqi@0	34	* If you write code that depends on this, you do so at your own risk.
aoqi@0	35	* This code and its internal interfaces are subject to change or
aoqi@0	36	* deletion without notice.</b>
aoqi@0	37	*/
aoqi@0	38	public class Constants {
aoqi@0	39
aoqi@0	40	/**
aoqi@0	41	* Converts a constant in internal representation (in which
aoqi@0	42	* boolean, char, byte, short, and int are each represented by an
aoqi@0	43	* Integer) into standard representation. Other values (including
aoqi@0	44	* null) are returned unchanged.
aoqi@0	45	*/
aoqi@0	46	public static Object decode(Object value, Type type) {
aoqi@0	47	if (value instanceof Integer) {
aoqi@0	48	int i = (Integer) value;
aoqi@0	49	switch (type.getTag()) {
aoqi@0	50	case BOOLEAN: return i != 0;
aoqi@0	51	case CHAR: return (char) i;
aoqi@0	52	case BYTE: return (byte) i;
aoqi@0	53	case SHORT: return (short) i;
aoqi@0	54	}
aoqi@0	55	}
aoqi@0	56	return value;
aoqi@0	57	}
aoqi@0	58
aoqi@0	59	/**
aoqi@0	60	* Returns a string representation of a constant value (given in
aoqi@0	61	* internal representation), quoted and formatted as in Java source.
aoqi@0	62	*/
aoqi@0	63	public static String format(Object value, Type type) {
aoqi@0	64	value = decode(value, type);
aoqi@0	65	switch (type.getTag()) {
aoqi@0	66	case BYTE: return formatByte((Byte) value);
aoqi@0	67	case LONG: return formatLong((Long) value);
aoqi@0	68	case FLOAT: return formatFloat((Float) value);
aoqi@0	69	case DOUBLE: return formatDouble((Double) value);
aoqi@0	70	case CHAR: return formatChar((Character) value);
aoqi@0	71	}
aoqi@0	72	if (value instanceof String)
aoqi@0	73	return formatString((String) value);
aoqi@0	74	return value + "";
aoqi@0	75	}
aoqi@0	76
aoqi@0	77	/**
aoqi@0	78	* Returns a string representation of a constant value (given in
aoqi@0	79	* standard wrapped representation), quoted and formatted as in
aoqi@0	80	* Java source.
aoqi@0	81	*/
aoqi@0	82	public static String format(Object value) {
aoqi@0	83	if (value instanceof Byte) return formatByte((Byte) value);
aoqi@0	84	if (value instanceof Short) return formatShort((Short) value);
aoqi@0	85	if (value instanceof Long) return formatLong((Long) value);
aoqi@0	86	if (value instanceof Float) return formatFloat((Float) value);
aoqi@0	87	if (value instanceof Double) return formatDouble((Double) value);
aoqi@0	88	if (value instanceof Character) return formatChar((Character) value);
aoqi@0	89	if (value instanceof String) return formatString((String) value);
aoqi@0	90	if (value instanceof Integer ||
aoqi@0	91	value instanceof Boolean) return value.toString();
aoqi@0	92	else
aoqi@0	93	throw new IllegalArgumentException("Argument is not a primitive type or a string; it " +
aoqi@0	94	((value == null) ?
aoqi@0	95	"is a null value." :
aoqi@0	96	"has class " +
aoqi@0	97	value.getClass().getName()) + "." );
aoqi@0	98	}
aoqi@0	99
aoqi@0	100	private static String formatByte(byte b) {
aoqi@0	101	return String.format("(byte)0x%02x", b);
aoqi@0	102	}
aoqi@0	103
aoqi@0	104	private static String formatShort(short s) {
aoqi@0	105	return String.format("(short)%d", s);
aoqi@0	106	}
aoqi@0	107
aoqi@0	108	private static String formatLong(long lng) {
aoqi@0	109	return lng + "L";
aoqi@0	110	}
aoqi@0	111
aoqi@0	112	private static String formatFloat(float f) {
aoqi@0	113	if (Float.isNaN(f))
aoqi@0	114	return "0.0f/0.0f";
aoqi@0	115	else if (Float.isInfinite(f))
aoqi@0	116	return (f < 0) ? "-1.0f/0.0f" : "1.0f/0.0f";
aoqi@0	117	else
aoqi@0	118	return f + "f";
aoqi@0	119	}
aoqi@0	120
aoqi@0	121	private static String formatDouble(double d) {
aoqi@0	122	if (Double.isNaN(d))
aoqi@0	123	return "0.0/0.0";
aoqi@0	124	else if (Double.isInfinite(d))
aoqi@0	125	return (d < 0) ? "-1.0/0.0" : "1.0/0.0";
aoqi@0	126	else
aoqi@0	127	return d + "";
aoqi@0	128	}
aoqi@0	129
aoqi@0	130	private static String formatChar(char c) {
aoqi@0	131	return '\'' + Convert.quote(c) + '\'';
aoqi@0	132	}
aoqi@0	133
aoqi@0	134	private static String formatString(String s) {
aoqi@0	135	return '"' + Convert.quote(s) + '"';
aoqi@0	136	}
aoqi@0	137	}