| /* |
| * 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.dataset; |
| |
| import org.apache.clerezza.*; |
| import org.apache.clerezza.implementation.in_memory.SimpleImmutableGraph; |
| import org.apache.clerezza.implementation.graph.WriteBlockedGraph; |
| import org.apache.clerezza.dataset.security.TcAccessController; |
| |
| import java.security.AccessControlException; |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.concurrent.locks.ReadWriteLock; |
| |
| /** |
| * A Secured triple collection wraps a triple collection checking each access |
| * for the rights on a the ImmutableGraph for which the uri is passed to the |
| * constructor. |
| * |
| * @author mir, hasan |
| */ |
| public class SecuredGraph implements Graph { |
| |
| private final Graph wrapped; |
| private final IRI name; |
| private final TcAccessController tcAccessController; |
| |
| public SecuredGraph(Graph wrapped, IRI name, |
| TcAccessController tcAccessController) { |
| this.wrapped = wrapped; |
| this.name = name; |
| this.tcAccessController = tcAccessController; |
| } |
| |
| @Override |
| public Iterator<Triple> filter(final BlankNodeOrIRI subject, final IRI predicate, final RDFTerm object) { |
| final Iterator<Triple> baseIter = wrapped.filter(subject, predicate, object); |
| return new Iterator<Triple>() { |
| |
| @Override |
| public boolean hasNext() { |
| checkRead(); |
| return baseIter.hasNext(); |
| } |
| |
| @Override |
| public Triple next() { |
| checkRead(); |
| return baseIter.next(); |
| } |
| |
| @Override |
| public void remove() { |
| checkWrite(); |
| baseIter.remove(); |
| } |
| }; |
| } |
| |
| @Override |
| public int size() { |
| checkRead(); |
| return wrapped.size(); |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| checkRead(); |
| return wrapped.isEmpty(); |
| } |
| |
| @Override |
| public Object[] toArray() { |
| checkRead(); |
| return wrapped.toArray(); |
| } |
| |
| @Override |
| public <T> T[] toArray(T[] a) { |
| checkRead(); |
| return wrapped.toArray(a); |
| } |
| |
| @Override |
| public boolean add(Triple e) { |
| checkWrite(); |
| return wrapped.add(e); |
| } |
| |
| @Override |
| public boolean remove(Object o) { |
| checkWrite(); |
| return wrapped.remove(o); |
| } |
| |
| @Override |
| public boolean addAll(Collection<? extends Triple> c) { |
| checkWrite(); |
| return wrapped.addAll(c); |
| } |
| |
| @Override |
| public boolean removeAll(Collection<?> c) { |
| checkWrite(); |
| return wrapped.removeAll(c); |
| } |
| |
| @Override |
| public boolean retainAll(Collection<?> c) { |
| checkWrite(); |
| return wrapped.retainAll(c); |
| } |
| |
| @Override |
| public void clear() { |
| checkWrite(); |
| wrapped.clear(); |
| } |
| |
| void checkRead() { |
| tcAccessController.checkReadPermission(name); |
| } |
| |
| void checkWrite() { |
| tcAccessController.checkReadWritePermission(name); |
| } |
| |
| @Override |
| public boolean contains(Object o) { |
| checkRead(); |
| return wrapped.contains((Triple) o); |
| } |
| |
| |
| @Override |
| public Iterator<Triple> iterator() { |
| return filter(null, null, null); |
| } |
| |
| @Override |
| public boolean containsAll(Collection<?> c) { |
| checkRead(); |
| return wrapped.containsAll(c); |
| } |
| |
| @Override |
| public ImmutableGraph getImmutableGraph() { |
| return new SimpleImmutableGraph(this); |
| } |
| |
| @Override |
| public ReadWriteLock getLock() { |
| return wrapped.getLock(); |
| } |
| |
| /** |
| * Returns the wrapped Graph if the caller has all access rights. |
| * If the caller has only the read access right, then a write-blocked |
| * Graph is returned. If the caller has neither the read nor the write |
| * access right then an AccessControlException is thrown. |
| * |
| * @return the wrapped Graph or a write-block Graph depending |
| * on the access rights of the caller. |
| */ |
| public Graph getUnsecuredGraph() { |
| try { |
| checkWrite(); |
| return wrapped; |
| } catch (AccessControlException ex) { |
| checkRead(); |
| return new WriteBlockedGraph(wrapped); |
| } |
| |
| } |
| } |