proguard.optimize.peephole.WrapperClassMerger Maven / Gradle / Ivy
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2018 GuardSquare NV
*
* 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.optimize.peephole;
import proguard.classfile.ClassConstants;
import proguard.classfile.Clazz;
import proguard.classfile.ProgramClass;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.ClassVisitor;
import proguard.optimize.info.WrapperClassMarker;
/**
* This ClassVisitor inlines the wrapper classes that it visits into their
* wrapped classes, whenever possible.
*
* A wrapper class can be a simple (anonymous) inner class that implements
* some interface, for example.
*
* @see WrapperClassMarker
* @see ClassMerger
* @author Eric Lafortune
*/
public class WrapperClassMerger
extends SimplifiedVisitor
implements ClassVisitor
{
private final boolean allowAccessModification;
private final ClassVisitor extraClassVisitor;
/**
* Creates a new WrappedClassMerger.
*
* @param allowAccessModification specifies whether the access modifiers
* of classes can be changed in order to
* merge them.
*/
public WrapperClassMerger(boolean allowAccessModification)
{
this(allowAccessModification, null);
}
/**
* Creates a new WrappedClassMerger.
* @param allowAccessModification specifies whether the access modifiers
* of classes can be changed in order to
* merge them.
* @param extraClassVisitor an optional extra visitor for all
* merged classes.
*/
public WrapperClassMerger(boolean allowAccessModification,
ClassVisitor extraClassVisitor)
{
this.allowAccessModification = allowAccessModification;
this.extraClassVisitor = extraClassVisitor;
}
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
// Only merge wrapper classes that extend java.lang.Object.
if (ClassConstants.NAME_JAVA_LANG_OBJECT.equals(programClass.getSuperName()))
{
// Do we have a wrapped program class?
Clazz wrappedClass = WrapperClassMarker.getWrappedClass(programClass);
if (wrappedClass instanceof ProgramClass)
{
// Try inlining the wrapper class into the wrapped class.
new ClassMerger((ProgramClass)wrappedClass,
allowAccessModification,
false,
true,
extraClassVisitor).visitProgramClass(programClass);
}
}
}
}
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