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.enhance;
016    
017    import org.apache.hivemind.ApplicationRuntimeException;
018    import org.apache.hivemind.Locatable;
019    import org.apache.hivemind.Location;
020    import org.apache.hivemind.Resource;
021    import org.apache.hivemind.util.Defense;
022    import org.apache.tapestry.IScript;
023    import org.apache.tapestry.engine.IScriptSource;
024    
025    /**
026     * @author Howard M. Lewis Ship
027     * @since 4.0
028     */
029    public class DeferredScriptImpl implements DeferredScript, Locatable
030    {
031        final Resource _scriptResource;
032    
033        final IScriptSource _scriptSource;
034    
035        final Location _location;
036    
037        public DeferredScriptImpl(Resource resource, IScriptSource source, Location location)
038        {
039            Defense.notNull(resource, "resource");
040            Defense.notNull(source, "source");
041    
042            _scriptResource = resource;
043            _scriptSource = source;
044            _location = location;
045        }
046    
047        public IScript getScript()
048        {
049            // No real reason to cache the script here, because a) they are rarely used
050            // and b) the IScriptSource caches.
051    
052            try
053            {
054                return _scriptSource.getScript(_scriptResource);
055            }
056            catch (Exception ex)
057            {
058                // Decorate the thrown exception with the correct location.
059    
060                throw new ApplicationRuntimeException(ex.getMessage(), _location, ex);
061            }
062        }
063    
064        public Location getLocation()
065        {
066            return _location;
067        }
068    
069        public String toString()
070        {
071            return "DeferredScriptImpl[" + _scriptResource + "]";
072        }
073    }