001    // Copyright 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.engine.state;
016    
017    import java.util.Collections;
018    import java.util.HashMap;
019    
020    import org.apache.hivemind.HiveMind;
021    
022    /**
023     * The default factory for the (default) global application state object. Creates and returns a
024     * synchronized HashMap, if no class name is specified. This duplicates behavior from Tapestry 3.0.
025     * 
026     * @author Howard M. Lewis Ship
027     * @since 4.0
028     */
029    public class DefaultGlobalStateObjectFactory extends NamedClassStateObjectFactory implements
030            StateObjectFactory
031    {
032    
033        public Object createStateObject()
034        {
035            if (HiveMind.isBlank(getClassName()))
036                return Collections.synchronizedMap(new HashMap());
037    
038            return super.createStateObject();
039        }
040    }