/*
 * Copyright 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.gwt.gen2.event.shared;

import java.util.*;

import com.google.gwt.gen2.event.shared.AbstractEvent.*;

/**
 * The default Handler manager's handler registry.
 */
class JavaHandlerRegistry extends HashMap<AbstractEvent.Type, ArrayList<EventHandler>>
{

    public void addHandler( AbstractEvent.Type eventKey, EventHandler handler )
    {
        ArrayList<EventHandler> l = super.get( eventKey );
        if ( l == null )
        {
            l = new ArrayList<EventHandler>();
            super.put( eventKey, l );
        }
        l.add( handler );
    }

    public void clearHandlers( Type<?, ?> type )
    {
        super.remove( type );
    }

    public void fireEvent( AbstractEvent event )
    {
        Type type = event.getType();
        int count = getHandlerCount( type );
        for ( int i = 0; i < count; i++ )
        {
            EventHandler handler = getHandler( type, i );
            type.fire( handler, event );
        }
    }

    public EventHandler getHandler( AbstractEvent.Type eventKey, int index )
    {
        assert (index < getHandlerCount( eventKey ));
        ArrayList<EventHandler> l = super.get( eventKey );
        return l.get( index );
    }

    public int getHandlerCount( AbstractEvent.Type eventKey )
    {
        ArrayList<EventHandler> l = super.get( eventKey );
        if ( l == null )
        {
            return 0;
        }
        else
        {
            return l.size();
        }
    }

    public void removeHandler( AbstractEvent.Type eventKey, EventHandler handler )
    {
        ArrayList<EventHandler> l = super.get( eventKey );
        if ( l != null )
        {
            l.remove( handler );
        }
    }
}