content: /*
   * Copyright (C) 2010 The Android Open Source Project
   *
   * 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.android.layoutlib.bridge.impl;
  
  import java.util.ArrayList;
  
  /**
   * Custom Stack implementation on top of an {@link ArrayList} instead of
   * using {@link java.util.Stack} which is on top of a vector.
   *
   * @param <T>
   */
  public class Stack<T> extends ArrayList<T> {
  
      private static final long serialVersionUID = 1L;
  
      public Stack() {
          super();
      }
  
      public Stack(int size) {
          super(size);
      }
  
      /**
       * Pushes the given object to the stack
       * @param object the object to push
       */
      public void push(T object) {
          add(object);
      }
  
      /**
       * Remove the object at the top of the stack and returns it.
       * @return the removed object or null if the stack was empty.
       */
      public T pop() {
          if (size() > 0) {
              return remove(size() - 1);
          }
  
          return null;
      }
  
      /**
       * Returns the object at the top of the stack.
       * @return the object at the top or null if the stack is empty.
       */
      public T peek() {
          if (size() > 0) {
              return get(size() - 1);
          }
  
          return null;
      }
  }
  