#1665

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

Build # #1665

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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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46 of 100 relevant lines covered (46.0%)

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/observer/src/main/java/com/iluwatar/observer/generic/Observable.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.generic;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * Generic observer inspired by Java Generics and Collection by Naftalin & Wadler
 *
 * @param <S> Subject
 * @param <O> Observer
 * @param <A> Argument type
 */
public abstract class Observable<S extends Observable<S, O, A>, O extends Observer<S, O, A>, A> {

  protected List<O> observers;

  public Observable() {
    this.observers = new CopyOnWriteArrayList<>();
  }

  public void addObserver(O observer) {
    this.observers.add(observer);
  }

  public void removeObserver(O observer) {
    this.observers.remove(observer);
  }

  /**
   * Notify observers
   */
  @SuppressWarnings("unchecked")
  public void notifyObservers(A argument) {
    for (O observer : observers) {
      observer.update((S) this, argument);
    }
  }
}

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.generic;
24
25	import java.util.List;
26	import java.util.concurrent.CopyOnWriteArrayList;
27
28	/**
29	* Generic observer inspired by Java Generics and Collection by Naftalin & Wadler
30	*
31	* @param <S> Subject
32	* @param <O> Observer
33	* @param <A> Argument type
34	*/
35	public abstract class Observable<S extends Observable<S, O, A>, O extends Observer<S, O, A>, A> {
36
37	protected List<O> observers;
38
39	public Observable() {	×
40	this.observers = new CopyOnWriteArrayList<>();	×
41	}	×
42
43	public void addObserver(O observer) {
44	this.observers.add(observer);	×
45	}	×
46
47	public void removeObserver(O observer) {
48	this.observers.remove(observer);	×
49	}	×
50
51	/**
52	* Notify observers
53	*/
54	@SuppressWarnings("unchecked")
55	public void notifyObservers(A argument) {
56	for (O observer : observers) {	×
57	observer.update((S) this, argument);	×
58	}	×
59	}	×
60	}

iluwatar / java-design-patterns / #1665

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