/*
 * 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 MemberVisitor} delegates its visits to another given
 * {@link MemberVisitor}, but only when visiting members of library
 * classes.
 *
 * @author Eric Lafortune
 */
public class LibraryMemberFilter implements MemberVisitor
{
    private final MemberVisitor memberVisitor;


    /**
     * Creates a new ProgramMemberFilter.
     * @param memberVisitor     the <code>MemberVisitor</code> to which
     *                          visits will be delegated.
     */
    public LibraryMemberFilter(MemberVisitor memberVisitor)
    {
        this.memberVisitor = memberVisitor;
    }


    // Implementations for MemberVisitor.

    public void visitProgramField(ProgramClass programClass, ProgramField programField)
    {
        // Don't delegate visits to program members.
    }


    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
    {
        // Don't delegate visits to program members.
    }


    public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
    {
        memberVisitor.visitLibraryField(libraryClass, libraryField);
    }


    public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
    {
        memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
    }
}
