////////////////////////////////////////////////////////////////////////////////
//
//  Licensed to the Apache Software Foundation (ASF) under one or more
//  contributor license agreements.  See the NOTICE file distributed with
//  this work for additional information regarding copyright ownership.
//  The ASF licenses this file to You 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 org.apache.royale.jewel.beads.validators
{
    import org.apache.royale.events.Event;

    /**
	 *  The SelectedItemNullValidator class is a specialty bead that can be used with
	 *  Group control to validate if a component (normaly list based) has a selectedItem
	 *  with null value
	 *
	 *  @langversion 3.0
	 *  @playerversion Flash 10.2
	 *  @playerversion AIR 2.6
	 *  @productversion Royale 0.9.4
	 */
	public class SelectedItemNullValidator extends Validator
	{
		/**
		 *  constructor.
		 *
		 *  @langversion 3.0
		 *  @playerversion Flash 10.2
		 *  @playerversion AIR 2.6
		 *  @productversion Royale 0.9.4
		 */
		public function SelectedItemNullValidator()
		{
			super()
		}

        /**
		 *  Override of the base class validate() method to validate if selected.
		 * 
		 *  @langversion 3.0
		 *  @playerversion Flash 10.2
		 *  @playerversion AIR 2.6
		 *  @productversion Royale 0.9.4
		 */
		override public function validate(event:Event = null):Boolean {
			if (super.validate(event))
            {
				if (hostComponent["selectedItem"] == null) {
					createErrorTip(requiredFieldError);
				} else {
					destroyErrorTip();
				}	
			}
			return !isError;
		}
    }
}
