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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.management.internal.cli.parser.preprocessor;

import java.util.ArrayList;
import java.util.List;

/**
 * Basic Stack implementation, used by
 * {@link PreprocessorUtils#isSyntaxValid(String)} for detecting valid syntax
 * 
 * @author Nikhil Jadhav
 * 
 * @param 
 */
public class Stack {
  private List list = new ArrayList();

  public void push(T object) {
    list.add(object);
  }

  public T pop() {
    if (list.size() > 0) {
      int length = list.size();
      T object = list.get(length - 1);
      list.remove(length - 1);
      return object;
    } else {
      return null;
    }
  }

  public Boolean isEmpty() {
    if (list.size() == 0) {
      return true;
    } else {
      return false;
    }
  }
}