| package org.eclipse.wst.common.project.facet.ui.internal; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| public abstract class AbstractDataModel |
| { |
| private final Map listeners = new HashMap(); |
| |
| public synchronized void addListener( final String event, |
| final IDataModelListener listener ) |
| { |
| List list = (List) this.listeners.get( event ); |
| |
| if( list == null ) |
| { |
| list = new ArrayList(); |
| this.listeners.put( event, list ); |
| } |
| |
| list.add( listener ); |
| } |
| |
| public synchronized void removeListener( final String event, |
| final IDataModelListener listener ) |
| { |
| final List list = (List) this.listeners.get( event ); |
| |
| if( list != null ) |
| { |
| list.remove( listener ); |
| } |
| } |
| |
| public synchronized void removeListener( final IDataModelListener listener ) |
| { |
| for( Iterator itr = this.listeners.keySet().iterator(); itr.hasNext(); ) |
| { |
| removeListener( (String) itr.next(), listener ); |
| } |
| } |
| |
| protected void notifyListeners( final String event ) |
| { |
| final List listeners = (List) this.listeners.get( event ); |
| |
| if( listeners != null ) |
| { |
| for( Iterator itr = listeners.iterator(); itr.hasNext(); ) |
| { |
| ( (IDataModelListener) itr.next() ).handleEvent(); |
| } |
| } |
| } |
| |
| public static interface IDataModelListener |
| { |
| void handleEvent(); |
| } |
| |
| } |