/*
* 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.hadoop.rdf.mapreduce.filter.positional;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.jena.graph.Node ;
import org.apache.jena.graph.NodeFactory ;
import org.apache.jena.hadoop.rdf.mapreduce.RdfMapReduceConstants;
/**
* A quad filter which selects quads which have matching objects
*
*
*
* @param <TKey>
* Key type
*/
public class QuadFilterByObjectUriMapper<TKey> extends AbstractQuadFilterByPositionMapper<TKey> {
private List<Node> objects = new ArrayList<Node>();
@Override
protected void setup(Context context) throws IOException, InterruptedException {
super.setup(context);
// Get the subject URIs we are filtering on
String[] objectUris = context.getConfiguration().getStrings(RdfMapReduceConstants.FILTER_OBJECT_URIS);
if (objectUris != null) {
for (String objectUri : objectUris) {
this.objects.add(NodeFactory.createURI(objectUri));
}
}
}
@Override
protected boolean acceptsAllGraphs() {
return true;
}
@Override
protected boolean acceptsObject(Node object) {
if (this.objects.size() == 0)
return false;
return this.objects.contains(object);
}
@Override
protected boolean acceptsAllPredicates() {
return true;
}
@Override
protected boolean acceptsAllSubjects() {
return true;
}
}