| /* |
| * 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; |
| } |
| } |