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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.classfile.util;
import proguard.classfile.*;
import proguard.classfile.visitor.*;
/**
* This class provides methods to find class members in a given class or in its
* hierarchy.
*
* @author Eric Lafortune
*/
public class MemberFinder
extends SimplifiedVisitor
implements MemberVisitor
{
private static class MemberFoundException extends RuntimeException {}
private static final MemberFoundException MEMBER_FOUND = new MemberFoundException();
private Clazz clazz;
private Member member;
/**
* Finds the field with the given name and descriptor in the given
* class or its hierarchy.
*/
public Field findField(Clazz referencingClass,
Clazz clazz,
String name,
String descriptor)
{
return (Field)findMember(referencingClass, clazz, name, descriptor, true);
}
/**
* Finds the method with the given name and descriptor in the given
* class or its hierarchy.
*/
public Method findMethod(Clazz referencingClass,
Clazz clazz,
String name,
String descriptor)
{
return (Method)findMember(referencingClass, clazz, name, descriptor, false);
}
/**
* Finds the class member with the given name and descriptor in the given
* class or its hierarchy.
*/
public Member findMember(Clazz referencingClass,
Clazz clazz,
String name,
String descriptor,
boolean isField)
{
// Organize a search in the hierarchy of superclasses and interfaces.
// The class member may be in a different class, if the code was
// compiled with "-target 1.2" or higher (the default in JDK 1.4).
try
{
this.clazz = null;
this.member = null;
clazz.hierarchyAccept(true, true, true, false, isField ?
(ClassVisitor)new NamedFieldVisitor(name, descriptor,
new MemberClassAccessFilter(referencingClass, this)) :
(ClassVisitor)new NamedMethodVisitor(name, descriptor,
new MemberClassAccessFilter(referencingClass, this)));
}
catch (MemberFoundException ex)
{
// We've found the member we were looking for.
}
return member;
}
/**
* Returns the corresponding class of the most recently found class
* member.
*/
public Clazz correspondingClass()
{
return clazz;
}
/**
* Returns whether the given method is overridden anywhere down the class
* hierarchy.
*/
public boolean isOverriden(Clazz clazz,
Method method)
{
String name = method.getName(clazz);
String descriptor = method.getDescriptor(clazz);
// Go looking for the method down the class hierarchy.
try
{
this.clazz = null;
this.member = null;
clazz.hierarchyAccept(false, false, false, true,
new NamedMethodVisitor(name, descriptor,
new MemberAccessFilter(0, ClassConstants.ACC_PRIVATE, this)));
}
catch (MemberFoundException ex)
{
// We've found an overriding method.
return true;
}
return false;
}
/**
* Returns whether the given field is shadowed anywhere down the class
* hierarchy.
*/
public boolean isShadowed(Clazz clazz,
Field field)
{
String name = field.getName(clazz);
String descriptor = field.getDescriptor(clazz);
// Go looking for the field down the class hierarchy.
try
{
this.clazz = null;
this.member = null;
clazz.hierarchyAccept(false, false, false, true,
new NamedFieldVisitor(name, descriptor,
new MemberAccessFilter(0, ClassConstants.ACC_PRIVATE, this)));
}
catch (MemberFoundException ex)
{
// We've found a shadowing field.
return true;
}
return false;
}
// // Implementations for ClassVisitor.
//
// private void visitAnyClass(Clazz clazz)
// {
// if (member == null)
// {
// member = isField ?
// (Member)clazz.findField(name, descriptor) :
// (Member)clazz.findMethod(name, descriptor);
//
// if (member != null)
// {
// this.clazz = clazz;
// }
// }
// }
// Implementations for MemberVisitor.
public void visitAnyMember(Clazz clazz, Member member)
{
this.clazz = clazz;
this.member = member;
throw MEMBER_FOUND;
}
}
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