001 // Copyright 2006, 2007, 2008 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.tapestry5.internal.services;
016
017 import java.util.Collection;
018 import java.util.Map;
019
020 import org.apache.tapestry5.ComponentResources;
021 import org.apache.tapestry5.SymbolConstants;
022 import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
023 import org.apache.tapestry5.ioc.internal.util.InternalUtils;
024 import org.apache.tapestry5.ioc.util.AvailableValues;
025 import org.apache.tapestry5.ioc.util.UnknownValueException;
026 import org.apache.tapestry5.model.ComponentModel;
027 import org.apache.tapestry5.services.MetaDataLocator;
028 import org.apache.tapestry5.services.PersistentFieldBundle;
029 import org.apache.tapestry5.services.PersistentFieldChange;
030 import org.apache.tapestry5.services.PersistentFieldStrategy;
031
032 public class PersistentFieldManagerImpl implements PersistentFieldManager
033 {
034 private final MetaDataLocator metaDataLocator;
035
036 private final Map<String, PersistentFieldStrategy> strategies;
037
038 public PersistentFieldManagerImpl(MetaDataLocator locator, Map<String, PersistentFieldStrategy> strategies)
039 {
040 metaDataLocator = locator;
041
042 this.strategies = strategies;
043 }
044
045 private PersistentFieldStrategy getStrategy(String strategyName)
046 {
047 PersistentFieldStrategy result = strategies.get(strategyName);
048
049 if (result == null)
050 throw new UnknownValueException(String.format("'%s' is not a defined persistent strategy.", strategyName),
051 new AvailableValues("Configured persistent field strategies", strategies));
052
053 return result;
054 }
055
056 public PersistentFieldBundle gatherChanges(String pageName)
057 {
058 Collection<PersistentFieldChange> allChanges = CollectionFactory.newList();
059
060 for (PersistentFieldStrategy strategy : strategies.values())
061 {
062 allChanges.addAll(strategy.gatherFieldChanges(pageName));
063 }
064
065 return new PersistentFieldBundleImpl(allChanges);
066 }
067
068 public void discardChanges(String pageName)
069 {
070 for (PersistentFieldStrategy strategy : strategies.values())
071 {
072 strategy.discardChanges(pageName);
073 }
074 }
075
076 public void discardChanges(String pageName, String strategyName) {
077 PersistentFieldStrategy strategy = strategies.get(strategyName);
078 if (strategy != null) strategy.discardChanges(pageName);
079 }
080
081
082 public void postChange(String pageName, ComponentResources resources, String fieldName, Object newValue)
083 {
084 String strategyName = findStrategy(resources, fieldName);
085 PersistentFieldStrategy strategy = getStrategy(strategyName);
086
087 strategy.postChange(pageName, resources.getNestedId(), fieldName, newValue);
088 }
089
090 private String findStrategy(ComponentResources resources, String fieldName)
091 {
092 ComponentModel model = resources.getComponentModel();
093
094 String strategy = model.getFieldPersistenceStrategy(fieldName);
095
096 if (InternalUtils.isNonBlank(strategy))
097 return strategy;
098
099 return metaDataLocator.findMeta(SymbolConstants.PERSISTENCE_STRATEGY, resources, String.class);
100 }
101 }