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+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ * of Java bytecode.
+ *
+ * Copyright (c) 2002-2014 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;
+
+import proguard.classfile.*;
+
+/**
+ * This value factory creates particular values.
+ *
+ * @author Eric Lafortune
+ */
+public class ParticularValueFactory
+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 == 0L ? LONG_VALUE_0 :
+ value == 1L ? 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);
+ }
+
+
+ public ReferenceValue createArrayReferenceValue(String type,
+ Clazz referencedClass,
+ IntegerValue arrayLength)
+ {
+ return type == null ?
+ REFERENCE_VALUE_NULL :
+ new ArrayReferenceValue(ClassConstants.TYPE_ARRAY + type,
+ referencedClass,
+ arrayLength);
+ }
+}