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    
015    package org.apache.tapestry.services.impl;
016    
017    import org.apache.hivemind.ApplicationRuntimeException;
018    import org.apache.hivemind.Location;
019    import org.apache.hivemind.internal.Module;
020    import org.apache.hivemind.service.ObjectProvider;
021    import 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     */
031    public 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    }