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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package proguard.classfile.visitor;

import proguard.classfile.*;


/**
 * This {@link ClassVisitor} lets a given {@link ClassVisitor}
 * optionally travel to the visited class, its superclass, its interfaces, and
 * its subclasses.
 *
 * @author Eric Lafortune
 */
public class ClassHierarchyTraveler
implements   ClassVisitor
{
    private final boolean visitThisClass;
    private final boolean visitSuperClass;
    private final boolean visitInterfaces;
    private final boolean visitSubclasses;

    private final ClassVisitor classVisitor;


    /**
     * Creates a new ClassHierarchyTraveler.
     * @param visitThisClass  specifies whether to visit the originally visited
     *                        classes.
     * @param visitSuperClass specifies whether to visit the super classes of
     *                        the visited classes.
     * @param visitInterfaces specifies whether to visit the interfaces of
     *                        the visited classes.
     * @param visitSubclasses specifies whether to visit the subclasses of
     *                        the visited classes.
     * @param classVisitor    the ClassVisitor to
     *                        which visits will be delegated.
     */
    public ClassHierarchyTraveler(boolean      visitThisClass,
                                  boolean      visitSuperClass,
                                  boolean      visitInterfaces,
                                  boolean      visitSubclasses,
                                  ClassVisitor classVisitor)
    {
        this.visitThisClass  = visitThisClass;
        this.visitSuperClass = visitSuperClass;
        this.visitInterfaces = visitInterfaces;
        this.visitSubclasses = visitSubclasses;

        this.classVisitor = classVisitor;
    }


    // Implementations for ClassVisitor.

    @Override
    public void visitAnyClass(Clazz clazz)
    {
        clazz.hierarchyAccept(visitThisClass,
                              visitSuperClass,
                              visitInterfaces,
                              visitSubclasses,
                              classVisitor);
    }
}