001// Copyright 2004, 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.services.impl;
016
017import org.apache.hivemind.ApplicationRuntimeException;
018import org.apache.hivemind.Location;
019import org.apache.hivemind.internal.Module;
020import org.apache.hivemind.service.ObjectProvider;
021import org.apache.tapestry.engine.IPropertySource;
022
023/**
024 * An implementation of {@link org.apache.hivemind.service.ObjectProvider}
025 * that gets the actual value from the
026 * <code>tapestry.GlobalPropertySource</code> service.
027 *
028 * @author Howard Lewis Ship
029 * @since 4.0
030 */
031public class PropertyObjectProvider implements ObjectProvider
032{
033    private IPropertySource _source;
034
035    /**
036     * Gets the value; the locator is the key passed to
037     * {@link IPropertySource#getPropertyValue(String)}.
038     */
039    public Object provideObject(
040        Module contributingModule,
041        Class propertyType,
042        String locator,
043        Location location)
044    {
045        try
046        {
047            return _source.getPropertyValue(locator);
048        }
049        catch (Exception ex)
050        {
051            throw new ApplicationRuntimeException(ex.getMessage(), location, ex);
052        }
053    }
054
055    public void setSource(IPropertySource source)
056    {
057        _source = source;
058    }
059
060}