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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2009 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.classfile.editor;
import proguard.classfile.*;
import proguard.classfile.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.util.SimplifiedVisitor;
/**
* This class is a <code>Comparable</code> wrapper of <code>Constant</code>
* objects. It can store an index, in order to identify the constant pool
* entry after it has been sorted. The comparison is primarily based on the
* types of the constant pool entries, and secondarily on the contents of
* the constant pool entries.
*
* @author Eric Lafortune
*/
class ComparableConstant
extends SimplifiedVisitor
implements Comparable, ConstantVisitor
{
private static final int[] PRIORITIES = new int[13];
static
{
PRIORITIES[ClassConstants.CONSTANT_Integer] = 0; // Possibly byte index (ldc).
PRIORITIES[ClassConstants.CONSTANT_Float] = 1;
PRIORITIES[ClassConstants.CONSTANT_String] = 2;
PRIORITIES[ClassConstants.CONSTANT_Class] = 3;
PRIORITIES[ClassConstants.CONSTANT_Long] = 4; // Always wide index (ldc2_w).
PRIORITIES[ClassConstants.CONSTANT_Double] = 5;
PRIORITIES[ClassConstants.CONSTANT_Fieldref] = 6; // Always wide index.
PRIORITIES[ClassConstants.CONSTANT_Methodref] = 7;
PRIORITIES[ClassConstants.CONSTANT_InterfaceMethodref] = 8;
PRIORITIES[ClassConstants.CONSTANT_NameAndType] = 9;
PRIORITIES[ClassConstants.CONSTANT_Utf8] = 10;
}
private final Clazz clazz;
private final int thisIndex;
private final Constant thisConstant;
private Constant otherConstant;
private int result;
public ComparableConstant(Clazz clazz, int index, Constant constant)
{
this.clazz = clazz;
this.thisIndex = index;
this.thisConstant = constant;
}
public int getIndex()
{
return thisIndex;
}
public Constant getConstant()
{
return thisConstant;
}
// Implementations for Comparable.
public int compareTo(Object other)
{
ComparableConstant otherComparableConstant = (ComparableConstant)other;
otherConstant = otherComparableConstant.thisConstant;
// Compare based on the original indices, if the actual constant pool
// entries are the same.
if (thisConstant == otherConstant)
{
int otherIndex = otherComparableConstant.thisIndex;
return thisIndex < otherIndex ? -1 :
thisIndex == otherIndex ? 0 :
1;
}
// Compare based on the tags, if they are different.
int thisTag = thisConstant.getTag();
int otherTag = otherConstant.getTag();
if (thisTag != otherTag)
{
return PRIORITIES[thisTag] < PRIORITIES[otherTag] ? -1 : 1;
}
// Otherwise compare based on the contents of the Constant objects.
thisConstant.accept(clazz, this);
return result;
}
// Implementations for ConstantVisitor.
public void visitIntegerConstant(Clazz clazz, IntegerConstant integerConstant)
{
// In JDK 1.4, we can use Integer.compare(a,b).
result = new Integer(integerConstant.getValue()).compareTo(new Integer(((IntegerConstant)otherConstant).getValue()));
}
public void visitLongConstant(Clazz clazz, LongConstant longConstant)
{
// In JDK 1.4, we can use Long.compare(a,b).
result = new Long(longConstant.getValue()).compareTo(new Long(((LongConstant)otherConstant).getValue()));
}
public void visitFloatConstant(Clazz clazz, FloatConstant floatConstant)
{
// In JDK 1.4, we can use Float.compare(a,b).
result = new Float(floatConstant.getValue()).compareTo(new Float(((FloatConstant)otherConstant).getValue()));
}
public void visitDoubleConstant(Clazz clazz, DoubleConstant doubleConstant)
{
// In JDK 1.4, we can use Double.compare(a,b).
result = new Double(doubleConstant.getValue()).compareTo(new Double(((DoubleConstant)otherConstant).getValue()));
}
public void visitStringConstant(Clazz clazz, StringConstant stringConstant)
{
result = stringConstant.getString(clazz).compareTo(((StringConstant)otherConstant).getString(clazz));
}
public void visitUtf8Constant(Clazz clazz, Utf8Constant utf8Constant)
{
result = utf8Constant.getString().compareTo(((Utf8Constant)otherConstant).getString());
}
public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant)
{
RefConstant otherRefConstant = (RefConstant)otherConstant;
result = (refConstant.getClassName(clazz) + ' ' +
refConstant.getName(clazz) + ' ' +
refConstant.getType(clazz))
.compareTo
(otherRefConstant.getClassName(clazz) + ' ' +
otherRefConstant.getName(clazz) + ' ' +
otherRefConstant.getType(clazz));
}
public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
{
result = classConstant.getName(clazz).compareTo(((ClassConstant)otherConstant).getName(clazz));
}
public void visitNameAndTypeConstant(Clazz clazz, NameAndTypeConstant nameAndTypeConstant)
{
NameAndTypeConstant otherNameAndTypeConstant = (NameAndTypeConstant)otherConstant;
result = (nameAndTypeConstant.getName(clazz) + ' ' +
nameAndTypeConstant.getType(clazz))
.compareTo
(otherNameAndTypeConstant.getName(clazz) + ' ' +
otherNameAndTypeConstant.getType(clazz));
}
// Implementations for Object.
public boolean equals(Object other)
{
return other != null &&
this.getClass().equals(other.getClass()) &&
this.getConstant().getClass().equals(((ComparableConstant)other).getConstant().getClass()) &&
this.compareTo(other) == 0;
}
public int hashCode()
{
return this.getClass().hashCode();
}
}
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