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ViewLocator

Kind of class:	public final class
Package:	com.bourre.view
Inherits from:	AbstractLocator
Version:	1.0
Author:	Francis Bourre
Classpath:	com.bourre.view.ViewLocator
File last modified:	Monday, 24 November 2008, 11:36:54

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/*
 * Copyright the original author or authors.
 * 
 * Licensed under the MOZILLA PUBLIC LICENSE, Version 1.1 (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.mozilla.org/MPL/MPL-1.1.html
 * 
 * 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.bourre.view
{
    import com.bourre.collection.ArrayIterator;
    import com.bourre.collection.HashMap;
    import com.bourre.collection.Iterator;
    import com.bourre.core.AbstractLocator;
    import com.bourre.error.NullPointerException;
    import com.bourre.plugin.NullPlugin;
    import com.bourre.plugin.Plugin;
    import com.bourre.plugin.PluginDebug;    

    /**
     * @author Francis Bourre
     * @version 1.0
     */
    final public class ViewLocator 
        extends AbstractLocator
    {
        private static const _M : HashMap = new HashMap();

        private var _owner : Plugin;

        public function ViewLocator( access : ConstructorAccess, owner : Plugin = null ) 
        {
            _owner = owner;
            super( AbstractView, null, PluginDebug.getInstance( getOwner() ) );
        }

        public static function getInstance( owner : Plugin = null ) : ViewLocator
        {
            if ( owner == null ) owner = NullPlugin.getInstance();

            if ( !( ViewLocator._M.containsKey( owner ) ) ) 
                ViewLocator._M.put( owner, new ViewLocator( new ConstructorAccess(), owner ) );

            return ViewLocator._M.get( owner );
        }

        public function getOwner() : Plugin
        {
            return _owner;
        }

        public function getView( key : String ) : AbstractView
        {
            return locate( key ) as AbstractView;
        }

        override public function register( key : String, o : Object ) : Boolean
        {
            if( key == null ) 
                throw new NullPointerException ( "Cannot register a view with a null name" );

            if( o == null ) 
                throw new NullPointerException ( "Cannot register a null view" );

            return super.register( key, o );
        }

        override public function release() : void
        {
            var i : Iterator = new ArrayIterator( _m.getValues() );
            while ( i.hasNext() ) i.next().release();
            super.release();
            _owner = null ;
        }

        /**
         * Returns the string representation of this instance.
         * @return the string representation of this instance
         */
        override public function toString() : String 
        {
            return super.toString() + (_owner?", owner: "+_owner:"No owner.");
        }
    }
}
internal class ConstructorAccess {}