content: /*
   * Copyright (c) 2016 the original author or authors.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  package com.rivescript.session;
  
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.List;
  
  import static com.rivescript.RiveScript.UNDEFINED;
  import static com.rivescript.session.SessionManager.HISTORY_SIZE;
  
  /**
   * Container to keep track of recent input and reply history.
   *
   * @author Noah Petherbridge
   * @author Marcel Overdijk
   */
  public class History implements Serializable {
  
  	private static final long serialVersionUID = 3383496053211557826L;
  
  	private List<String> input;
  	private List<String> reply;
  
  	public History() {
  		this.input = new ArrayList<>(HISTORY_SIZE);
  		this.reply = new ArrayList<>(HISTORY_SIZE);
  		for (int i = 0; i < HISTORY_SIZE; i++) {
  			this.input.add(UNDEFINED);
  			this.reply.add(UNDEFINED);
  		}
  	}
  
  	public List<String> getInput() {
  		return input;
  	}
  
  	public String getInput(int index) {
  		return input.get(index);
  	}
  
  	public List<String> getReply() {
  		return reply;
  	}
  
  	public String getReply(int index) {
  		return reply.get(index);
  	}
  
  	@Override
  	public boolean equals(Object o) {
  		if (this == o) {
  			return true;
  		}
  		if (o == null || getClass() != o.getClass()) {
  			return false;
  		}
  		History that = (History) o;
  		if (input != null ? !input.equals(that.input) : that.input != null) {
  			return false;
  		}
  		return reply != null ? reply.equals(that.reply) : that.reply == null;
  	}
  
  	@Override
  	public int hashCode() {
  		int result = input != null ? input.hashCode() : 0;
  		result = 31 * result + (reply != null ? reply.hashCode() : 0);
  		return result;
  	}
  
  	@Override
  	public String toString() {
  		return "History{" +
  				"input=" + input +
  				", reply=" + reply +
  				'}';
  	}
  }
  