/*
* 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.rdf.simple.storage;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.clerezza.rdf.core.Graph;
import org.apache.clerezza.rdf.core.MGraph;
import org.apache.clerezza.rdf.core.TripleCollection;
import org.apache.clerezza.rdf.core.UriRef;
import org.apache.clerezza.rdf.core.access.EntityAlreadyExistsException;
import org.apache.clerezza.rdf.core.access.EntityUndeletableException;
import org.apache.clerezza.rdf.core.access.NoSuchEntityException;
import org.apache.clerezza.rdf.core.access.WeightedTcProvider;
import org.apache.clerezza.rdf.core.impl.SimpleGraph;
import org.apache.clerezza.rdf.core.impl.SimpleMGraph;
/**
* @scr.component
* @scr.service interface="org.apache.clerezza.rdf.core.access.WeightedTcProvider"
*
* @author mir
*/
public class SimpleTcProvider implements WeightedTcProvider {
private Map<UriRef, TripleCollection> tripleMap = new HashMap<UriRef, TripleCollection>();
@Override
public Graph createGraph(UriRef name, TripleCollection triples)
throws EntityAlreadyExistsException {
if ((name == null) || (name.getUnicodeString() == null)
|| (name.getUnicodeString().trim().length() == 0)) {
throw new IllegalArgumentException("Name must not be null");
}
try {
// throws NoSuchEntityException if a TripleCollection with that name
// already exists
this.getTriples(name);
} catch (NoSuchEntityException e) {
Graph result;
if (triples == null) {
result = new SimpleGraph(new SimpleMGraph());
} else {
if (Graph.class.isAssignableFrom(triples.getClass())) {
result = (Graph) triples;
} else {
result = new SimpleGraph(triples);
}
}
tripleMap.put(name, result);
return result;
}
throw new EntityAlreadyExistsException(name);
}
@Override
public MGraph createMGraph(UriRef name) throws EntityAlreadyExistsException {
if ((name == null) || (name.getUnicodeString() == null)
|| (name.getUnicodeString().trim().length() == 0)) {
throw new IllegalArgumentException("Name must not be null");
}
try {
// throws NoSuchEntityException if a TripleCollection with that name
// already exists
this.getTriples(name);
} catch (NoSuchEntityException e) {
MGraph result = new SimpleMGraph();
tripleMap.put(name, result);
return result;
}
throw new EntityAlreadyExistsException(name);
}
@Override
public void deleteTripleCollection(UriRef name)
throws NoSuchEntityException, EntityUndeletableException {
if (tripleMap.remove(name) == null) {
throw new NoSuchEntityException(name);
}
}
@Override
public Graph getGraph(UriRef name) throws NoSuchEntityException {
TripleCollection tripleCollection = tripleMap.get(name);
if (tripleCollection == null) {
throw new NoSuchEntityException(name);
} else if (Graph.class.isAssignableFrom(tripleCollection.getClass())) {
return (Graph) tripleCollection;
}
throw new NoSuchEntityException(name);
}
@Override
public MGraph getMGraph(UriRef name) throws NoSuchEntityException {
TripleCollection tripleCollection = tripleMap.get(name);
if (tripleCollection == null) {
throw new NoSuchEntityException(name);
} else if (MGraph.class.isAssignableFrom(tripleCollection.getClass())) {
return (MGraph) tripleCollection;
}
throw new NoSuchEntityException(name);
}
@Override
public Set<UriRef> getNames(Graph graph) {
throw new UnsupportedOperationException(
"Not supported yet. equals() has to be implemented first");
}
@Override
public TripleCollection getTriples(UriRef name)
throws NoSuchEntityException {
TripleCollection tripleCollection = tripleMap.get(name);
if (tripleCollection == null) {
throw new NoSuchEntityException(name);
} else {
return tripleCollection;
}
}
@Override
public int getWeight() {
return 1;
}
@Override
public Set<UriRef> listGraphs() {
Set<UriRef> result = new HashSet<UriRef>();
for (UriRef uriRef : listTripleCollections()) {
if (tripleMap.get(uriRef) instanceof Graph) {
result.add(uriRef);
}
}
return result;
}
@Override
public Set<UriRef> listMGraphs() {
Set<UriRef> result = new HashSet<UriRef>();
for (UriRef uriRef : listTripleCollections()) {
if (tripleMap.get(uriRef) instanceof MGraph) {
result.add(uriRef);
}
}
return result;
}
@Override
public Set<UriRef> listTripleCollections() {
return tripleMap.keySet();
}
}