#1668

Committed 21 Feb 2016 06:36PM UTC coverage: 46.0% (-44.9%) from 90.894%

Build # #1668

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push

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Commit Message

Merge pull request #388 from Crossy147/monad-pattern

Monad pattern

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/observer/src/main/java/com/iluwatar/observer/Weather.java

/**
 * The MIT License
 * Copyright (c) 2014 Ilkka Seppälä
 *
 * 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.iluwatar.observer;

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

/**
 * 
 * Weather can be observed by implementing {@link WeatherObserver} interface and registering as
 * listener.
 * 
 */
public class Weather {

  private WeatherType currentWeather;
  private List<WeatherObserver> observers;

  public Weather() {
    observers = new ArrayList<>();
    currentWeather = WeatherType.SUNNY;
  }

  public void addObserver(WeatherObserver obs) {
    observers.add(obs);
  }

  public void removeObserver(WeatherObserver obs) {
    observers.remove(obs);
  }

  /**
   * Makes time pass for weather
   */
  public void timePasses() {
    WeatherType[] enumValues = WeatherType.values();
    currentWeather = enumValues[(currentWeather.ordinal() + 1) % enumValues.length];
    System.out.println("The weather changed to " + currentWeather + ".");
    notifyObservers();
  }

  private void notifyObservers() {
    for (WeatherObserver obs : observers) {
      obs.update(currentWeather);
    }
  }
}

1	/**
2	* The MIT License
3	* Copyright (c) 2014 Ilkka Seppälä
4	*
5	* Permission is hereby granted, free of charge, to any person obtaining a copy
6	* of this software and associated documentation files (the "Software"), to deal
7	* in the Software without restriction, including without limitation the rights
8	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9	* copies of the Software, and to permit persons to whom the Software is
10	* furnished to do so, subject to the following conditions:
11	*
12	* The above copyright notice and this permission notice shall be included in
13	* all copies or substantial portions of the Software.
14	*
15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21	* THE SOFTWARE.
22	*/
23	package com.iluwatar.observer;
24
25	import java.util.ArrayList;
26	import java.util.List;
27
28	/**
29	*
30	* Weather can be observed by implementing {@link WeatherObserver} interface and registering as
31	* listener.
32	*
33	*/
34	public class Weather {
35
36	private WeatherType currentWeather;
37	private List<WeatherObserver> observers;
38
39	public Weather() {	×
40	observers = new ArrayList<>();	×
41	currentWeather = WeatherType.SUNNY;	×
42	}	×
43
44	public void addObserver(WeatherObserver obs) {
45	observers.add(obs);	×
46	}	×
47
48	public void removeObserver(WeatherObserver obs) {
49	observers.remove(obs);	×
50	}	×
51
52	/**
53	* Makes time pass for weather
54	*/
55	public void timePasses() {
56	WeatherType[] enumValues = WeatherType.values();	×
57	currentWeather = enumValues[(currentWeather.ordinal() + 1) % enumValues.length];	×
58	System.out.println("The weather changed to " + currentWeather + ".");	×
59	notifyObservers();	×
60	}	×
61
62	private void notifyObservers() {
63	for (WeatherObserver obs : observers) {	×
64	obs.update(currentWeather);	×
65	}	×
66	}	×
67	}

iluwatar / java-design-patterns / #1668

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