// Copyright 2005 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.services.impl;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import org.apache.hivemind.Resource;
import org.apache.hivemind.lib.chain.ChainBuilder;
import org.apache.tapestry.IComponent;
import org.apache.tapestry.INamespace;
import org.apache.tapestry.engine.IPropertySource;
import org.apache.tapestry.event.ResetEventListener;
import org.apache.tapestry.services.ComponentPropertySource;
import org.apache.tapestry.spec.IComponentSpecification;
import org.apache.tapestry.util.PropertyHolderPropertySource;
/**
* TODO: Figure out a testing strategy for this beast!
*
* @author Howard M. Lewis Ship
* @since 4.0
*/
public class ComponentPropertySourceImpl implements ComponentPropertySource, ResetEventListener
{
private IPropertySource _globalProperties;
private ChainBuilder _chainBuilder;
private Map _componentSources = new HashMap();
private Map _localizedComponentSources = new HashMap();
private Map _namespaceSources = new HashMap();
private Map _localizedNamespaceSources = new HashMap();
public synchronized void resetEventDidOccur()
{
_componentSources.clear();
_localizedComponentSources.clear();
_namespaceSources.clear();
_localizedNamespaceSources.clear();
}
private synchronized IPropertySource getSourceForNamespace(INamespace namespace)
{
Resource key = namespace.getSpecificationLocation();
IPropertySource result = (IPropertySource) _namespaceSources.get(key);
if (result == null)
{
result = createSourceForNamespace(namespace);
_namespaceSources.put(key, result);
}
return result;
}
private synchronized IPropertySource getSourceForComponent(IComponent component)
{
Resource key = component.getSpecification().getSpecificationLocation();
IPropertySource result = (IPropertySource) _componentSources.get(key);
if (result == null)
{
result = createSourceForComponent(component);
_componentSources.put(key, result);
}
return result;
}
private synchronized LocalizedPropertySource getLocalizedSourceForComponent(IComponent component)
{
Resource key = component.getSpecification().getSpecificationLocation();
LocalizedPropertySource result = (LocalizedPropertySource) _localizedComponentSources
.get(key);
if (result == null)
{
result = new LocalizedPropertySource(getSourceForComponent(component));
_localizedComponentSources.put(key, result);
}
return result;
}
private synchronized LocalizedPropertySource getLocalizedSourceForNamespace(INamespace namespace)
{
Resource key = namespace.getSpecificationLocation();
LocalizedPropertySource result = (LocalizedPropertySource) _localizedNamespaceSources
.get(key);
if (result == null)
{
result = new LocalizedPropertySource(getSourceForNamespace(namespace));
_localizedNamespaceSources.put(key, result);
}
return result;
}
private IPropertySource createSourceForComponent(IComponent component)
{
IComponentSpecification specification = component.getSpecification();
List sources = new ArrayList();
sources.add(new PropertyHolderPropertySource(specification));
sources.add(getSourceForNamespace(component.getNamespace()));
return (IPropertySource) _chainBuilder.buildImplementation(
IPropertySource.class,
sources,
ImplMessages.componentPropertySourceDescription(specification));
}
private IPropertySource createSourceForNamespace(INamespace namespace)
{
List sources = new ArrayList();
sources.add(new PropertyHolderPropertySource(namespace.getSpecification()));
sources.add(_globalProperties);
return (IPropertySource) _chainBuilder.buildImplementation(
IPropertySource.class,
sources,
ImplMessages.namespacePropertySourceDescription(namespace));
}
public String getComponentProperty(IComponent component, String propertyName)
{
return getSourceForComponent(component).getPropertyValue(propertyName);
}
public String getLocalizedComponentProperty(IComponent component, Locale locale,
String propertyName)
{
return getLocalizedSourceForComponent(component).getPropertyValue(propertyName, locale);
}
public String getNamespaceProperty(INamespace namespace, String propertyName)
{
return getSourceForNamespace(namespace).getPropertyValue(propertyName);
}
public String getLocalizedNamespaceProperty(INamespace namespace, Locale locale,
String propertyName)
{
return getLocalizedSourceForNamespace(namespace).getPropertyValue(propertyName, locale);
}
public void setChainBuilder(ChainBuilder chainBuilder)
{
_chainBuilder = chainBuilder;
}
public void setGlobalProperties(IPropertySource globalProperties)
{
_globalProperties = globalProperties;
}
}