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
015package org.apache.tapestry.engine.state;
016
017import java.util.Collections;
018import java.util.HashMap;
019
020import 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 */
029public 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}