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/*
 * Copyright (C) 2006-2010 Schlichtherle IT Services
 *
 * 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 de.schlichtherle.util;

/**
 * A counter which's value is local to each thread.
 * Its initial value is {@code 0}.
 *
 * @author Christian Schlichtherle
 * @version $Id: ThreadLocalCounter.java,v 1.4 2010/08/20 13:09:49 christian_schlichtherle Exp $
 * @since TrueZIP 6.2
 */
public class ThreadLocalCounter extends ThreadLocal {

    public final int getCounter() {
        return ((Holder) get()).count;
    }

    public final void setCounter(int count) {
        ((Holder) get()).count = count;
    }

    public final void increment() {
        ((Holder) get()).count++;
    }

    public final void decrement() {
        ((Holder) get()).count--;
    }

    protected final Object initialValue() {
        return new Holder();
    }

    private static final class Holder {
        int count;
    }
}