/*
* 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.core.impl;
import java.util.AbstractCollection;
import java.util.Collection;
import java.util.Iterator;
import org.apache.clerezza.rdf.core.NonLiteral;
import org.apache.clerezza.rdf.core.Resource;
import org.apache.clerezza.rdf.core.Triple;
import org.apache.clerezza.rdf.core.TripleCollection;
import org.apache.clerezza.rdf.core.UriRef;
import org.apache.clerezza.rdf.core.access.ReadOnlyException;
import org.apache.clerezza.rdf.core.event.FilterTriple;
import org.apache.clerezza.rdf.core.event.GraphListener;
/**
*
* This is a wrapper object for <code>TripleCollection</code>. If <code>SecurityManger</code>
* is not <code>null</code> <code>TcManager</code> checks the <code>TcPermission</code>.
* If read-only permissions are set this wrapper is used instead of <code>TripleCollection</code>
* and throws exceptions when add or remove methods are called.
*
* @author tsuy
*/
public class WriteBlockedTripleCollection extends AbstractCollection<Triple>
implements TripleCollection {
private TripleCollection triples;
public WriteBlockedTripleCollection(TripleCollection triples) {
this.triples = triples;
}
@Override
public int size() {
return triples.size();
}
@Override
public Iterator<Triple> filter(final NonLiteral subject, final UriRef predicate, final Resource object) {
final Iterator<Triple> baseIter = triples.filter(subject, predicate, object);
return new Iterator<Triple>() {
@Override
public boolean hasNext() {
return baseIter.hasNext();
}
@Override
public Triple next() {
return baseIter.next();
}
@Override
public void remove() {
throw new ReadOnlyException("remove");
}
};
}
@Override
public boolean add(Triple e) {
throw new ReadOnlyException("add");
}
@Override
public boolean addAll(Collection<? extends Triple> c) {
throw new ReadOnlyException("add all");
}
@Override
public void clear() {
throw new ReadOnlyException("clear");
}
@Override
public boolean remove(Object o) {
throw new ReadOnlyException("remove");
}
@Override
public boolean removeAll(Collection<?> c) {
throw new ReadOnlyException("remove all");
}
@Override
public boolean retainAll(Collection<?> c) {
throw new ReadOnlyException("retain all");
}
@Override
public void addGraphListener(GraphListener listener, FilterTriple filter,
long delay) {
triples.addGraphListener(listener, filter, delay);
}
@Override
public void addGraphListener(GraphListener listener, FilterTriple filter) {
triples.addGraphListener(listener, filter);
}
@Override
public void removeGraphListener(GraphListener listener) {
triples.removeGraphListener(listener);
}
@Override
public Iterator iterator() {
return filter(null, null, null);
}
}