Observer (padrão de desenho) - Revision history

Root: Redirected page to ist:Observer (padrão de desenho)

2018-11-07T14:26:42Z

Redirected page to ist:Observer (padrão de desenho)

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	~~{{NAVPO}}~~		#REDIRECT [[ist:Observer (padrão de desenho)]]
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	~~O padrão ''observer'' permite observar o estado de um objecto. Os observadores registam o seu interesse no estado junto do objecto; quando o estado do objecto muda, os observadores são notificados.~~

	~~==Estrutura==~~

	~~===Diagrama de classes===~~

	~~O padrão ''observer'' tem a seguinte estrutura de classes:~~

	~~[[Image:observer-dpcd.png\|600px]]~~

	~~===Diagrama de sequência===~~

	~~As colaborações entre os intervenientes são as que figuram no seguinte diagrama de sequência:~~

	[[~~Image~~:~~observer-dpsd.png\|500px]]~~

	~~==Exemplo==~~

	* [[Observer (padrão de desenho)~~/Exemplo 01: Estação Meteorológica\|Exemplo 01: Estação Meteorológica]]~~

	~~[[category:Ensino]]~~
	~~[[category:PO~~]]

Root at 12:03, 19 November 2015

2015-11-19T12:03:19Z

← Older revision		Revision as of 12:03, 19 November 2015
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	O padrão ''observer'' permite observar o estado de um objecto. Os observadores registam o seu interesse no estado junto do objecto; quando o estado do objecto muda, os observadores são notificados.		O padrão ''observer'' permite observar o estado de um objecto. Os observadores registam o seu interesse no estado junto do objecto; quando o estado do objecto muda, os observadores são notificados.

Root: /* Exemplo */

2013-11-04T19:14:43Z

Exemplo

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Root at 15:25, 23 October 2013

2013-10-23T15:25:32Z

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	}		}

	[[category:~~OOP~~]]		[[category:Ensino]]
	[[category:~~Teaching~~]]		[[category:PO]]
	[[category:PO Exemplos]]		[[category:PO Exemplos]]
			[[category:Java]]

Root: /* Dois contextos */

2013-10-14T16:48:59Z

Dois contextos

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	[[category:OOP]]		[[category:OOP]]
	[[category:Teaching]]		[[category:Teaching]]
			[[category:PO Exemplos]]

Root at 13:10, 1 October 2010

2010-10-01T13:10:48Z

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	O padrão ''observer'' permite observar o estado de um objecto. Os observadores registam o seu interesse no estado junto do objecto; quando o estado do objecto muda, os observadores são notificados.		O padrão ''observer'' permite observar o estado de um objecto. Os observadores registam o seu interesse no estado junto do objecto; quando o estado do objecto muda, os observadores são notificados.

Root at 15:39, 19 November 2008

2008-11-19T15:39:52Z

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Root: /* Representação de dados */

2008-11-19T10:44:54Z

Representação de dados

← Older revision		Revision as of 10:44, 19 November 2008
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	Os dados de meteorologia correspondem ao objecto observado.		Os dados de meteorologia correspondem ao objecto observado.

	<~~java5~~>		<cpp>
	public class WeatherData implements Subject {		public class WeatherData implements Subject {
	private ArrayList<Observer> _observers = new ArrayList<Observer>();		private ArrayList<Observer> _observers = new ArrayList<Observer>();
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	}		}
	</~~java5~~>		</cpp>

	===Dois contextos===		===Dois contextos===

Root: /* Representação de dados */

2008-11-19T10:42:44Z

Representação de dados

← Older revision		Revision as of 10:42, 19 November 2008
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	Os dados de meteorologia correspondem ao objecto observado.		Os dados de meteorologia correspondem ao objecto observado.

	<B>public~~</B> <B>~~class~~</B>~~ WeatherData ~~<B>~~implements~~</B>~~ Subject {		<java5>
	~~<B>~~private<~~/B> <B~~>~~<FONT COLOR~~=~~"#0095ff">~~ArrayList<~~/FONT></B~~> ~~observers~~;		public class WeatherData implements Subject {
	~~<B>~~private~~</B> <FONT COLOR="#800000">~~float~~</FONT> temperature~~;		private ArrayList<Observer> _observers = new ArrayList<Observer>();
	~~<B>~~private~~</B> <FONT COLOR="#800000">~~float~~</FONT> humidity~~;		private float _temperature;
	~~<B>~~private~~</B> <FONT COLOR="#800000">~~float~~</FONT> pressure~~;		private float _humidity;
			private float _pressure;

	~~<B>~~public~~</B> <FONT COLOR="#000080">~~WeatherData~~</FONT>~~() { ~~observers = <B>new</B> <B><FONT COLOR="#0095ff">ArrayList</FONT></B>();~~ }		public WeatherData() { }

	~~<B>~~public~~</B> <FONT COLOR="#800000">~~void~~</FONT> <FONT COLOR="#000080">~~registerObserver~~</FONT>~~(Observer o) { ~~observers~~.~~<FONT COLOR="#000080">~~add~~</FONT>~~(o); }		public void registerObserver(Observer o) { _observers.add(o); }

	~~<B>~~public~~</B> <FONT COLOR="#800000">~~void~~</FONT> <FONT COLOR="#000080">~~removeObserver~~</FONT>~~(Observer o) {		public void removeObserver(Observer o) {
	~~<FONT COLOR="#800000">~~int~~</FONT>~~ i = ~~observers~~.~~<FONT COLOR="#000080">~~indexOf~~</FONT>~~(o);		int i = _observers.indexOf(o);
	~~<B>~~if~~</B>~~ (i ~~>= <FONT COLOR~~=~~"#0000ff">~~0~~</FONT>~~) { ~~observers~~.~~<FONT COLOR="#000080">~~remove~~</FONT>~~(i); }		if (i >= 0) { _observers.remove(i); }
	}		}

	~~<B>~~public~~</B> <FONT COLOR="#800000">~~void~~</FONT> <FONT COLOR="#000080">~~notifyObservers~~</FONT>~~() {		public void notifyObservers() {
	~~<B>~~for~~</B>~~ (~~<FONT COLOR="#800000">~~int~~</FONT>~~ i = ~~<FONT COLOR="#0000ff">~~0~~</FONT>~~; i ~~< observers~~.~~<FONT COLOR="#000080">~~size~~</FONT>~~(); i++) {		for (int i = 0; i < _observers.size(); i++) {
	Observer observer = ~~(Observer)observers~~.~~<FONT COLOR="#000080">~~get~~</FONT>~~(i);		Observer observer = _observers.get(i);
	observer.~~<FONT COLOR="#000080">~~update~~</FONT>~~(temperature, humidity, pressure);		observer.update(temperature, humidity, pressure);
	}		}
	}		}

	~~<B>~~public~~</B> <FONT COLOR="#800000">~~void~~</FONT> <FONT COLOR="#000080">~~measurementsChanged~~</FONT>~~() { ~~<FONT COLOR="#000080">~~notifyObservers~~</FONT>~~(); }		public void measurementsChanged() { notifyObservers(); }

	~~<B>~~public~~</B> <FONT COLOR="#800000">~~void~~</FONT> <FONT COLOR="#000080">~~setMeasurements~~</FONT>~~(~~<FONT COLOR="#800000">~~float~~</FONT>~~ temperature, ~~<FONT COLOR="#800000">~~float~~</FONT>~~ humidity, ~~<FONT COLOR="#800000">~~float~~</FONT>~~ pressure) {		public void setMeasurements(float temperature, float humidity, float pressure) {
	~~<B>this</B>.<FONT COLOR="#000080">temperature</FONT>~~ = temperature;		_temperature = temperature;
	~~<B>this</B>.<FONT COLOR="#000080">humidity</FONT>~~ = humidity;		_humidity = humidity;
	~~<B>this</B>.<FONT COLOR="#000080">pressure</FONT>~~ = pressure;		_pressure = pressure;
	~~<FONT COLOR="#000080">~~measurementsChanged~~</FONT>~~();		measurementsChanged();
	}		}

	}		}
			</java5>

	===Dois contextos===		===Dois contextos===

Root: Observer (padrão de desenho) moved to Observer (padrão de desenho)

2008-11-12T08:44:31Z

Observer (padrão de desenho) moved to Observer (padrão de desenho)

← Older revision	Revision as of 08:44, 12 November 2008
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