Stack.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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 org.apache.geode.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
 * 
 * 
 * @param <T>
 */
public class Stack<T> {
  private List<T> list = new ArrayList<T>();

  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;
    }
  }
}