/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2010 Eric Lafortune (eric@graphics.cornell.edu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program 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 for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.evaluation.value;
/**
* This class provides methods to create and reuse IntegerValue objects.
*
* @author Eric Lafortune
*/
public class SpecificValueFactory
extends ValueFactory
{
// Shared copies of Value objects, to avoid creating a lot of objects.
static final IntegerValue INTEGER_VALUE_M1 = new ParticularIntegerValue(-1);
static final IntegerValue INTEGER_VALUE_0 = new ParticularIntegerValue(0);
static final IntegerValue INTEGER_VALUE_1 = new ParticularIntegerValue(1);
static final IntegerValue INTEGER_VALUE_2 = new ParticularIntegerValue(2);
static final IntegerValue INTEGER_VALUE_3 = new ParticularIntegerValue(3);
static final IntegerValue INTEGER_VALUE_4 = new ParticularIntegerValue(4);
static final IntegerValue INTEGER_VALUE_5 = new ParticularIntegerValue(5);
static final LongValue LONG_VALUE_0 = new ParticularLongValue(0);
static final LongValue LONG_VALUE_1 = new ParticularLongValue(1);
static final FloatValue FLOAT_VALUE_0 = new ParticularFloatValue(0.0f);
static final FloatValue FLOAT_VALUE_1 = new ParticularFloatValue(1.0f);
static final FloatValue FLOAT_VALUE_2 = new ParticularFloatValue(2.0f);
static final DoubleValue DOUBLE_VALUE_0 = new ParticularDoubleValue(0.0);
static final DoubleValue DOUBLE_VALUE_1 = new ParticularDoubleValue(1.0);
private static int POS_ZERO_FLOAT_BITS = Float.floatToIntBits(0.0f);
private static long POS_ZERO_DOUBLE_BITS = Double.doubleToLongBits(0.0);
// Implementations for ValueFactory.
public IntegerValue createIntegerValue(int value)
{
switch (value)
{
case -1: return INTEGER_VALUE_M1;
case 0: return INTEGER_VALUE_0;
case 1: return INTEGER_VALUE_1;
case 2: return INTEGER_VALUE_2;
case 3: return INTEGER_VALUE_3;
case 4: return INTEGER_VALUE_4;
case 5: return INTEGER_VALUE_5;
default: return new ParticularIntegerValue(value);
}
}
public LongValue createLongValue(long value)
{
return value == 0 ? LONG_VALUE_0 :
value == 1 ? LONG_VALUE_1 :
new ParticularLongValue(value);
}
public FloatValue createFloatValue(float value)
{
// Make sure to distinguish between +0.0 and -0.0.
return value == 0.0f && Float.floatToIntBits(value) == POS_ZERO_FLOAT_BITS
? FLOAT_VALUE_0 :
value == 1.0f ? FLOAT_VALUE_1 :
value == 2.0f ? FLOAT_VALUE_2 :
new ParticularFloatValue(value);
}
public DoubleValue createDoubleValue(double value)
{
// Make sure to distinguish between +0.0 and -0.0.
return value == 0.0 && Double.doubleToLongBits(value) == POS_ZERO_DOUBLE_BITS
? DOUBLE_VALUE_0 :
value == 1.0 ? DOUBLE_VALUE_1 :
new ParticularDoubleValue(value);
}
}