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 org.apache.hivemind.ApplicationRuntimeException;
018import org.apache.hivemind.impl.BaseLocatable;
019
020/**
021 * Simple state object factory that instantiates an instance of a class.
022 * 
023 * @author Howard M. Lewis Ship
024 * @since 4.0
025 */
026public class InstantiateClassStateObjectFactory extends BaseLocatable implements StateObjectFactory
027{
028    private Class _objectClass;
029
030    public Object createStateObject()
031    {
032        try
033        {
034            return _objectClass.newInstance();
035        }
036        catch (Exception ex)
037        {
038            throw new ApplicationRuntimeException(StateMessages.unableToInstantiateObject(
039                    _objectClass,
040                    ex), getLocation(), ex);
041        }
042    }
043
044    public void setObjectClass(Class objectClass)
045    {
046        _objectClass = objectClass;
047    }
048}