84 lines
2.5 KiB
Java
Executable File
84 lines
2.5 KiB
Java
Executable File
/*
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* Copyright (C) 2001-2004 Red Hat Inc. All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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package com.arsdigita.domain;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import org.apache.log4j.Logger;
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/**
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* The GlobalObserverManager class is a singleton class that allows observers
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* implementing the GlobalObserver interface to be registered.
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*
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* Once such observers are registered they have the opportunity to observe
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* every single observable domain object that is created. The
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* GlobalObserver.shouldObserve(DomainObject) method can be used by an observer
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* to select which objects to observe.
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*
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* @author <a href="mailto:rhs@mit.edu">rhs@mit.edu</a>
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* @version $Id: GlobalObserverManager.java 2070 2010-01-28 08:47:41Z pboy $
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*/
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public class GlobalObserverManager {
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private static final GlobalObserverManager s_manager =
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new GlobalObserverManager();
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/**
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* Returns the global observer manager. This is a singleton class that
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* allows the "global" observers, or observers of any
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*/
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public static final GlobalObserverManager getManager() {
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s_log.debug("getInstance of GlobalObserverManager invoked.");
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return s_manager;
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}
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private static final Logger s_log = Logger.getLogger(GlobalObserverManager.class);
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private List m_observers = new ArrayList();
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private GlobalObserverManager() {}
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/**
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* Adds a new observer.
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*
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* @param doo the new observer
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*/
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public void addObserver(GlobalObserver go) {
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s_log.debug("addObserver invoked.");
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m_observers.add(go);
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}
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/**
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* Returns the global observers.
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*
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* @return The observers for the given domain object.
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*/
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Iterator getObservers() {
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return m_observers.iterator();
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}
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}
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