/*
* Copyright 2005 Ralf Joachim, Werner Guttmann
*
* 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.castor.mapping;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.castor.core.CoreProperties;
import org.castor.core.util.AbstractProperties;
import org.exolab.castor.mapping.MappingException;
import org.exolab.castor.mapping.MappingLoader;
/**
* @author <a href="mailto:werner DOT guttmann AT gmx DOT net">Werner Guttmann</a>
* @author <a href="mailto:ralf DOT joachim AT syscon DOT eu">Ralf Joachim</a>
* @version $Revision: 5951 $ $Date: 2006-04-25 16:09:10 -0600 (Tue, 25 Apr 2006) $
*/
public final class MappingLoaderRegistry {
/** The <a href="http://jakarta.apache.org/commons/logging/">Jakarta Commons
* Logging </a> instance used for all logging. */
private static final Log LOG = LogFactory.getLog(MappingLoaderRegistry.class);
/** The cached mapping loader factories. */
private final List _mappingLoaderFactories = new ArrayList();
/** Already loaded mapping loaders. */
private final List _mappingLoaders = new ArrayList();
/**
* Creates an instance of this registry, loading the mapping loader
* factories from the castor.properties file.
* @param properties Properties.
*/
public MappingLoaderRegistry(final AbstractProperties properties) {
Object[] objects = properties.getObjectArray(
CoreProperties.MAPPING_LOADER_FACTORIES, getClass().getClassLoader());
for (int i = 0; i < objects.length; i++) {
_mappingLoaderFactories.add(objects[i]);
}
}
/**
* Deletes all 'cached' mapping loader factories.
*/
public void clear() {
Iterator iter = _mappingLoaders.iterator();
while (iter.hasNext()) {
((MappingLoader) iter.next()).clear();
}
}
//--------------------------------------------------------------------------
/**
* Returns a mapping loader for the suitable source and binding type. The engine's
* specific mapping loader is used to create binding specific descriptors.
* The mapping loader is cached in memory and returned in subsequent method calls.
*
* @param sourceType The type of the mapping source.
* @param bindingType The binding type to load from mapping.
* @return A mapping loader
* @throws MappingException A mapping error occured preventing
* descriptors from being generated from the loaded mapping
*/
public MappingLoader getMappingLoader(
final String sourceType,
final BindingType bindingType) throws MappingException {
Iterator iter = _mappingLoaderFactories.iterator();
while (iter.hasNext()) {
MappingLoaderFactory loaderFactory = (MappingLoaderFactory) iter.next();
if (loaderFactory.getSourceType().equals(sourceType)
&& (loaderFactory.getBindingType() == bindingType)) {
MappingLoader mappingLoader = loaderFactory.getMappingLoader();
_mappingLoaders.add(mappingLoader);
return mappingLoader;
}
}
String msg = "No mapping loader/factory for: " + "SourceType=" + sourceType
+ " / BindingType=" + bindingType;
LOG.error(msg);
throw new MappingException(msg);
}
/**
* Returns a list of 'cached' mapping loader factories.
* @return a list of 'cached' mapping loader factories.
*/
public Collection getMappingLoaderFactories() {
return Collections.unmodifiableCollection(_mappingLoaderFactories);
}
//--------------------------------------------------------------------------
}