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.contrib.inspector;
016    
017    import java.util.ArrayList;
018    import java.util.Collection;
019    import java.util.List;
020    
021    import org.apache.hivemind.service.ClassFabUtils;
022    import org.apache.tapestry.BaseComponent;
023    import org.apache.tapestry.IPage;
024    import org.apache.tapestry.IRequestCycle;
025    import org.apache.tapestry.event.PageBeginRenderListener;
026    import org.apache.tapestry.event.PageEvent;
027    import org.apache.tapestry.record.PropertyChange;
028    import org.apache.tapestry.record.PropertyPersistenceStrategySource;
029    
030    /**
031     * Component of the {@link Inspector}page used to display the persisent properties of the page.
032     * 
033     * @author Howard Lewis Ship
034     */
035    
036    public abstract class ShowProperties extends BaseComponent implements PageBeginRenderListener
037    {
038    
039        public abstract void setProperties(List properties);
040    
041        public abstract PropertyChange getChange();
042    
043        /** Injected */
044    
045        public abstract PropertyPersistenceStrategySource getPropertySource();
046    
047        public void pageBeginRender(PageEvent event)
048        {
049            IRequestCycle cycle = event.getRequestCycle();
050    
051            Inspector inspector = (Inspector) getPage();
052    
053            IPage inspectedPage = inspector.getInspectedPage();
054    
055            String pageName = inspectedPage.getPageName();
056    
057            PropertyPersistenceStrategySource source = getPropertySource();
058    
059            Collection properties = source.getAllStoredChanges(pageName, cycle);
060    
061            // TODO: sorting
062    
063            setProperties(new ArrayList(properties));
064        }
065    
066        /**
067         * Returns the name of the value's class, if the value is non-null.
068         */
069    
070        public String getValueClassName()
071        {
072            Object value = getChange().getNewValue();
073    
074            if (value == null)
075                return "<null>";
076    
077            return ClassFabUtils.getJavaClassName(value.getClass());
078        }
079    }