// Copyright 2006, 2007 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry.internal.services;
import static org.apache.tapestry.ioc.internal.util.CollectionFactory.newCaseInsensitiveMap;
import java.util.Collection;
import java.util.Map;
import org.apache.tapestry.ComponentResources;
import org.apache.tapestry.ioc.internal.util.CollectionFactory;
import org.apache.tapestry.ioc.internal.util.InternalUtils;
import org.apache.tapestry.model.ComponentModel;
import org.apache.tapestry.services.MetaDataLocator;
import org.apache.tapestry.services.PersistentFieldBundle;
import org.apache.tapestry.services.PersistentFieldChange;
import org.apache.tapestry.services.PersistentFieldManager;
import org.apache.tapestry.services.PersistentFieldStrategy;
public class PersistentFieldManagerImpl implements PersistentFieldManager
{
public static final String META_KEY = "tapestry.persistence-strategy";
public static final String DEFAULT_STRATEGY = "session";
private final MetaDataLocator _metaDataLocator;
private final Map<String, PersistentFieldStrategy> _strategies;
public PersistentFieldManagerImpl(MetaDataLocator locator,
Map<String, PersistentFieldStrategy> strategies)
{
_metaDataLocator = locator;
_strategies = newCaseInsensitiveMap(strategies);
}
private PersistentFieldStrategy getStrategy(String strategyName)
{
PersistentFieldStrategy result = _strategies.get(strategyName);
if (result == null)
throw new RuntimeException(ServicesMessages.unknownPersistentFieldStrategy(
strategyName,
_strategies.keySet()));
return result;
}
public PersistentFieldBundle gatherChanges(String pageName)
{
Collection<PersistentFieldChange> allChanges = CollectionFactory.newList();
for (PersistentFieldStrategy strategy : _strategies.values())
{
allChanges.addAll(strategy.gatherFieldChanges(pageName));
}
return new PersistentFieldBundleImpl(allChanges);
}
public void postChange(String pageName, ComponentResources resources, String fieldName,
Object newValue)
{
String strategyName = findStrategy(resources, fieldName);
PersistentFieldStrategy strategy = getStrategy(strategyName);
strategy.postChange(pageName, resources.getNestedId(), fieldName, newValue);
}
private String findStrategy(ComponentResources resources, String fieldName)
{
ComponentModel model = resources.getComponentModel();
String strategy = model.getFieldPersistenceStrategy(fieldName);
if (InternalUtils.isNonBlank(strategy))
return strategy;
return _metaDataLocator.findMeta(META_KEY, resources);
}
}