/*
* 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.jena.reasoner.rulesys.impl;
import org.apache.jena.graph.Graph ;
import org.apache.jena.graph.Node ;
import org.apache.jena.graph.Triple ;
import org.apache.jena.graph.impl.SimpleEventManager ;
import org.apache.jena.graph.impl.WrappedGraph ;
import org.apache.jena.util.iterator.ExtendedIterator ;
/**
* A SafeGraph wraps a graph which might contain generalized RDF
* triples and hides them from API queries so that consumers
* of it are safe (but can use getRawGraph() to get back the unsafe graph.
*/
public class SafeGraph extends WrappedGraph implements Graph {
/** Wrap a graph to hide generalized triples */
public SafeGraph(Graph base) {
super(base);
}
@Override
public ExtendedIterator<Triple> find( Triple triple ) {
return find(triple.getMatchSubject(), triple.getMatchPredicate(), triple.getMatchObject());
}
@Override
public ExtendedIterator<Triple> find( Node s, Node p, Node o ) {
return SimpleEventManager.notifyingRemove( this,
base.find( s, p, o ).filterDrop( t -> t.getSubject().isLiteral() ||
t.getPredicate().isBlank() || t.getPredicate().isLiteral() ) );
}
/**
* Return the unfiltered version of the graph
*/
public Graph getRawGraph() {
return base;
}
}