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    package org.apache.tapestry.annotations;
015    
016    import java.util.Collection;
017    import java.util.Iterator;
018    
019    import org.apache.hivemind.ApplicationRuntimeException;
020    import org.apache.hivemind.HiveMind;
021    import org.apache.tapestry.enhance.EnhancementOperation;
022    import org.apache.tapestry.enhance.EnhancementWorker;
023    import org.apache.tapestry.spec.IComponentSpecification;
024    import org.apache.tapestry.spec.IContainedComponent;
025    
026    /**
027     * An enhancement worker which performs several housekeeping tasks
028     * relating to injected components.
029     * Currently the worker ensures that copies of components contain
030     * the correct bindings.
031     * 
032     * @author Andreas Andreou
033     * @since 4.1.1
034     */
035    public class ComponentHousekeepingWorker implements EnhancementWorker
036    {
037        public void performEnhancement( EnhancementOperation op, IComponentSpecification spec )
038        {
039            for ( Iterator i = spec.getComponentIds().iterator(); i.hasNext(); )
040            {
041                String id = ( String ) i.next();
042                IContainedComponent cc = spec.getComponent(id);
043                String copyOf = cc.getCopyOf();
044                Collection bindingNames = cc.getBindingNames();
045                
046                if (HiveMind.isNonBlank(copyOf) && bindingNames.size() == 0)
047                {
048                    IContainedComponent source = spec.getComponent(copyOf);
049                    if (source == null)
050                        throw new ApplicationRuntimeException(AnnotationMessages.unableToCopy(copyOf));                
051                    
052                    AnnotationUtils.copyBindings(source, cc);
053                }            
054            }
055        }
056    }