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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.obfuscate;
import proguard.classfile.*;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.MemberVisitor;
import java.util.Map;
/**
* This MemberVisitor collects all new (obfuscation) names of the members
* that it visits.
*
* @see MemberObfuscator
*
* @author Eric Lafortune
*/
public class MemberNameCollector
extends SimplifiedVisitor
implements MemberVisitor
{
private final boolean allowAggressiveOverloading;
private final Map descriptorMap;
/**
* Creates a new MemberNameCollector.
* @param allowAggressiveOverloading a flag that specifies whether class
* members can be overloaded aggressively.
* @param descriptorMap the map of descriptors to
* [new name - old name] maps.
*/
public MemberNameCollector(boolean allowAggressiveOverloading,
Map descriptorMap)
{
this.allowAggressiveOverloading = allowAggressiveOverloading;
this.descriptorMap = descriptorMap;
}
// Implementations for MemberVisitor.
public void visitAnyMember(Clazz clazz, Member member)
{
// Special cases: <clinit> and <init> are always kept unchanged.
// We can ignore them here.
String name = member.getName(clazz);
if (name.equals(ClassConstants.INTERNAL_METHOD_NAME_CLINIT) ||
name.equals(ClassConstants.INTERNAL_METHOD_NAME_INIT))
{
return;
}
// Get the member's new name.
String newName = MemberObfuscator.newMemberName(member);
// Remember it, if it has already been set.
if (newName != null)
{
// Get the member's descriptor.
String descriptor = member.getDescriptor(clazz);
// Check whether we're allowed to do aggressive overloading
if (!allowAggressiveOverloading)
{
// Trim the return argument from the descriptor if not.
// Works for fields and methods alike.
descriptor = descriptor.substring(0, descriptor.indexOf(')')+1);
}
// Put the [descriptor - new name] in the map,
// creating a new [new name - old name] map if necessary.
Map nameMap = MemberObfuscator.retrieveNameMap(descriptorMap, descriptor);
// Isn't there another original name for this new name, or should
// this original name get priority?
String otherName = (String)nameMap.get(newName);
if (otherName == null ||
MemberObfuscator.hasFixedNewMemberName(member) ||
name.compareTo(otherName) < 0)
{
// Remember not to use the new name again in this name space.
nameMap.put(newName, name);
}
}
}
}
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