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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2013 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.attribute.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.util.*;
import proguard.classfile.visitor.ClassVisitor;
import java.util.*;
/**
* This ClassVisitor sorts the interfaces of the program classes that it visits.
*
* @author Eric Lafortune
*/
public class InterfaceSorter
extends SimplifiedVisitor
implements ClassVisitor,
AttributeVisitor
{
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
int[] interfaces = programClass.u2interfaces;
int interfacesCount = programClass.u2interfacesCount;
if (interfacesCount > 1)
{
// Sort the interfaces.
Arrays.sort(interfaces, 0, interfacesCount);
// Remove any duplicate entries.
int newInterfacesCount = 0;
int previousInterfaceIndex = 0;
for (int index = 0; index < interfacesCount; index++)
{
int interfaceIndex = interfaces[index];
// Isn't this a duplicate of the previous interface?
if (interfaceIndex != previousInterfaceIndex)
{
interfaces[newInterfacesCount++] = interfaceIndex;
// Remember the interface.
previousInterfaceIndex = interfaceIndex;
}
}
programClass.u2interfacesCount = newInterfacesCount;
// Update the signature, if any
programClass.attributesAccept(this);
}
}
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
public void visitSignatureAttribute(Clazz clazz, SignatureAttribute signatureAttribute)
{
// Process the generic definitions, superclass, and implemented
// interfaces.
String signature = clazz.getString(signatureAttribute.u2signatureIndex);
// Count the signature types.
InternalTypeEnumeration internalTypeEnumeration =
new InternalTypeEnumeration(signature);
int count = 0;
int interfacesCount = -1;
while (internalTypeEnumeration.hasMoreTypes())
{
String internalType = internalTypeEnumeration.nextType();
count++;
if (ClassUtil.isInternalClassType(internalType))
{
interfacesCount++;
}
}
// Put the signature types in an array.
internalTypeEnumeration =
new InternalTypeEnumeration(signature);
String[] internalTypes = new String[count];
for (int index = 0; index < count; index++)
{
String internalType = internalTypeEnumeration.nextType();
internalTypes[index] = internalType;
}
// Sort the interface types in the array.
Arrays.sort(internalTypes, count - interfacesCount, count);
// Recompose the signature types in a string.
StringBuffer newSignatureBuffer = new StringBuffer();
for (int index = 0; index < count; index++)
{
// Is this not an interface type, or an interface type that isn't
// a duplicate of the previous interface type?
if (index < count - interfacesCount ||
!internalTypes[index].equals(internalTypes[index-1]))
{
newSignatureBuffer.append(internalTypes[index]);
}
}
String newSignature = newSignatureBuffer.toString();
// Did the signature change?
if (!newSignature.equals(signature))
{
// Update the signature.
((Utf8Constant)((ProgramClass)clazz).constantPool[signatureAttribute.u2signatureIndex]).setString(newSignatureBuffer.toString());
// Clear the referenced classes.
// TODO: Properly update the referenced classes.
signatureAttribute.referencedClasses = null;
}
}
}
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