com.generallycloud.baseio.collection.FixedThreadStack Maven / Gradle / Ivy

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/*
 * Copyright 2015-2017 GenerallyCloud.com
 *  
 * 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 com.generallycloud.baseio.collection;

/**
 * @author wangkai
 *
 */
public class FixedThreadStack {

    private V[] vs;
    private int size;

    @SuppressWarnings("unchecked")
    public FixedThreadStack(int capacity) {
        this.size = 0;
        this.vs = (V[]) new Object[capacity];
    }

    public V pop() {
        if (size == 0) {
            return null;
        }
        return vs[--size];
    }

    public void push(V v) {
        if (size == vs.length) {
            return;
        }
        vs[size++] = v;
    }

}