Coverage Report - org.apache.tapestry.record.PageRecorderImpl
 
Classes in this File Line Coverage Branch Coverage Complexity
PageRecorderImpl
0%
0/42
0%
0/10
2.125
 
 1  
 // Copyright 2005 The Apache Software Foundation
 2  
 //
 3  
 // Licensed under the Apache License, Version 2.0 (the "License");
 4  
 // you may not use this file except in compliance with the License.
 5  
 // You may obtain a copy of the License at
 6  
 //
 7  
 //     http://www.apache.org/licenses/LICENSE-2.0
 8  
 //
 9  
 // Unless required by applicable law or agreed to in writing, software
 10  
 // distributed under the License is distributed on an "AS IS" BASIS,
 11  
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 12  
 // See the License for the specific language governing permissions and
 13  
 // limitations under the License.
 14  
 
 15  
 package org.apache.tapestry.record;
 16  
 
 17  
 import java.util.Collection;
 18  
 import java.util.Iterator;
 19  
 
 20  
 import org.apache.hivemind.ApplicationRuntimeException;
 21  
 import org.apache.hivemind.ErrorLog;
 22  
 import org.apache.hivemind.util.Defense;
 23  
 import org.apache.hivemind.util.PropertyUtils;
 24  
 import org.apache.tapestry.IComponent;
 25  
 import org.apache.tapestry.IPage;
 26  
 import org.apache.tapestry.engine.IPageRecorder;
 27  
 import org.apache.tapestry.event.ObservedChangeEvent;
 28  
 import org.apache.tapestry.spec.IPropertySpecification;
 29  
 
 30  
 /**
 31  
  * @author Howard M. Lewis Ship
 32  
  * @since 4.0
 33  
  */
 34  
 public class PageRecorderImpl implements IPageRecorder
 35  
 {
 36  
 
 37  
     private String _pageName;
 38  
 
 39  
     private PropertyPersistenceStrategySource _strategySource;
 40  
 
 41  0
     private boolean _locked = false;
 42  
 
 43  
     private ErrorLog _log;
 44  
 
 45  
     public PageRecorderImpl(String pageName, PropertyPersistenceStrategySource strategySource, ErrorLog log)
 46  0
     {
 47  0
         Defense.notNull(pageName, "pageName");
 48  0
         Defense.notNull(strategySource, "strategySource");
 49  0
         Defense.notNull(log, "log");
 50  
 
 51  0
         _pageName = pageName;
 52  0
         _strategySource = strategySource;
 53  0
         _log = log;
 54  0
     }
 55  
 
 56  
     public void commit()
 57  
     {
 58  0
         _locked = true;
 59  0
     }
 60  
 
 61  
     public boolean isLocked()
 62  
     {
 63  0
         return _locked;
 64  
     }
 65  
     
 66  
     public Collection getChanges()
 67  
     {
 68  0
         return _strategySource.getAllStoredChanges(_pageName);
 69  
     }
 70  
 
 71  
     public void rollback(IPage page)
 72  
     {
 73  0
         Collection changes = getChanges();
 74  
 
 75  0
         Iterator i = changes.iterator();
 76  
 
 77  0
         while(i.hasNext())
 78  
         {
 79  0
             PropertyChange change = (PropertyChange) i.next();
 80  
 
 81  0
             applyChange(page, change);
 82  0
         }
 83  0
     }
 84  
 
 85  
     private void applyChange(IPage page, PropertyChange change)
 86  
     {
 87  0
         String idPath = change.getComponentPath();
 88  
 
 89  0
         IComponent component = (idPath == null) ? page : page.getNestedComponent(idPath);
 90  
         
 91  0
         PropertyUtils.write(component, change.getPropertyName(), change.getNewValue());
 92  0
     }
 93  
 
 94  
     public void observeChange(ObservedChangeEvent event)
 95  
     {
 96  0
         IComponent component = event.getComponent();
 97  0
         String propertyName = event.getPropertyName();
 98  
 
 99  0
         if (_locked)
 100  
         {
 101  0
             _log.error(RecordMessages.recorderLocked(propertyName, component), null, null);
 102  0
             return;
 103  
         }
 104  
         
 105  0
         PropertyPersistenceStrategy strategy = findStrategy(component, propertyName);
 106  
 
 107  0
         if (strategy != null)
 108  0
             strategy.store(_pageName, component.getIdPath(), propertyName, event.getNewValue());
 109  0
     }
 110  
 
 111  
     // package private for testing
 112  
 
 113  
     PropertyPersistenceStrategy findStrategy(IComponent component, String propertyName)
 114  
     {
 115  
         // So much for Law of Demeter!
 116  
 
 117  0
         IPropertySpecification propertySpecification = component.getSpecification().getPropertySpecification(propertyName);
 118  
 
 119  0
         if (propertySpecification == null)
 120  
         {
 121  0
             _log.error(RecordMessages.missingPropertySpecification(propertyName, component), null, null);
 122  0
             return null;
 123  
         }
 124  
 
 125  0
         String name = propertySpecification.getPersistence();
 126  
 
 127  
         // Should check for nulls, but the architecture of the framework pretty
 128  
         // much
 129  
         // ensures that we won't get here unless there is a property
 130  
         // and a persistence value for the property.
 131  
 
 132  
         try
 133  
         {
 134  0
             return _strategySource.getStrategy(name);
 135  
         }
 136  0
         catch (ApplicationRuntimeException ex)
 137  
         {
 138  0
             _log.error(ex.getMessage(), propertySpecification.getLocation(), ex);
 139  0
             return null;
 140  
         }
 141  
     }
 142  
 
 143  
 }