/*
 * 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.classfile.visitor;

import proguard.classfile.ClassPool;


/**
 * This ClassPoolVisitor delegates all visits to each ClassPoolVisitor
 * in a given list.
 *
 * @author Eric Lafortune
 */
public class MultiClassPoolVisitor implements ClassPoolVisitor
{
    private static final int ARRAY_SIZE_INCREMENT = 5;

    private ClassPoolVisitor[] classPoolVisitors;
    private int                classPoolVisitorCount;


    public MultiClassPoolVisitor()
    {
    }


    public MultiClassPoolVisitor(ClassPoolVisitor[] classPoolVisitors)
    {
        this.classPoolVisitors     = classPoolVisitors;
        this.classPoolVisitorCount = classPoolVisitors.length;
    }


    public void addClassPoolVisitor(ClassPoolVisitor classPoolVisitor)
    {
        ensureArraySize();

        classPoolVisitors[classPoolVisitorCount++] = classPoolVisitor;
    }


    private void ensureArraySize()
    {
        if (classPoolVisitors == null)
        {
            classPoolVisitors = new ClassPoolVisitor[ARRAY_SIZE_INCREMENT];
        }
        else if (classPoolVisitors.length == classPoolVisitorCount)
        {
            ClassPoolVisitor[] newClassPoolVisitors =
                new ClassPoolVisitor[classPoolVisitorCount +
                                     ARRAY_SIZE_INCREMENT];
            System.arraycopy(classPoolVisitors, 0,
                             newClassPoolVisitors, 0,
                             classPoolVisitorCount);
            classPoolVisitors = newClassPoolVisitors;
        }
    }


    // Implementations for ClassPoolVisitor.

    public void visitClassPool(ClassPool classPool)
    {
        for (int index = 0; index < classPoolVisitorCount; index++)
        {
            classPoolVisitors[index].visitClassPool(classPool);
        }
    }
}
