/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.clerezza.platform.typehandlerspace;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.locks.Lock;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
import org.apache.felix.scr.annotations.References;
import org.apache.felix.scr.annotations.Service;
import org.osgi.service.component.ComponentContext;
import org.apache.clerezza.platform.config.SystemConfig;
import org.apache.clerezza.platform.typepriority.TypePrioritizer;
import org.apache.clerezza.rdf.core.MGraph;
import org.apache.clerezza.rdf.core.Resource;
import org.apache.clerezza.rdf.core.UriRef;
import org.apache.clerezza.rdf.core.access.LockableMGraph;
import org.apache.clerezza.rdf.ontologies.RDFS;
import org.apache.clerezza.rdf.utils.RdfList;
import org.apache.felix.scr.annotations.ReferencePolicy;
/**
* @author rbn
*/
@Component
@Service(value=TypeHandlerDiscovery.class)
@References({
@Reference(name="typeHandler",
cardinality=ReferenceCardinality.OPTIONAL_MULTIPLE,
referenceInterface=Object.class,
target="(org.apache.clerezza.platform.typehandler=true)",
policy=ReferencePolicy.DYNAMIC)})
public class TypeHandlerDiscoveryImpl implements TypeHandlerDiscovery {
@Reference
private TypePrioritizer typePrioritizer;
private final Map<UriRef, Object> typeHandlerMap = Collections.synchronizedMap(
new HashMap<UriRef, Object>());
protected void bindTypeHandler(Object typeHandler) {
SupportedTypes supportedTypes = typeHandler.getClass()
.getAnnotation(SupportedTypes.class);
if (supportedTypes == null) {
return;
}
for (String typeUriString : supportedTypes.types()) {
UriRef typeUri = new UriRef(typeUriString);
typeHandlerMap.put(typeUri, typeHandler);
}
}
protected void unbindTypeHandler(Object typeHandler) {
Iterator<UriRef> keys = typeHandlerMap.keySet().iterator();
Set<UriRef> toRemove = new HashSet<UriRef>(typeHandlerMap.size());
synchronized(typeHandlerMap) {
while (keys.hasNext()) {
UriRef uriRef = keys.next();
if(typeHandlerMap.get(uriRef) == typeHandler) {
toRemove.add(uriRef);
}
}
}
keys = toRemove.iterator();
while (keys.hasNext()) {
typeHandlerMap.remove(keys.next());
}
}
@Override
public Object getTypeHandler(final Set<UriRef> types) {
return AccessController.doPrivileged(new PrivilegedAction<Object>() {
@Override
public Object run() {
Iterator<UriRef> prioritizedTypes = typePrioritizer.iterate(types);
while (prioritizedTypes.hasNext()) {
Object result = typeHandlerMap.get(prioritizedTypes.next());
if (result != null) {
return result;
}
}
return typeHandlerMap.get(RDFS.Resource);
}
});
}
}