/*
* 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;
import org.apache.jena.hadoop.rdf.types.QuadWritable;
import org.apache.jena.sparql.core.Quad ;
/**
* A quad filter mapper which accepts only valid quads, by which we mean they
* meet the following criteria:
* <ul>
* <li>Graph is a URI or Blank Node</li>
* <li>Subject is a URI or Blank Node</li>
* <li>Predicate is a URI</li>
* <li>Object is a URI, Blank Node or Literal</li>
* </ul>
*
*
*
* @param <TKey>
*/
public final class ValidQuadFilterMapper<TKey> extends AbstractQuadFilterMapper<TKey> {
@Override
protected final boolean accepts(TKey key, QuadWritable tuple) {
Quad q = tuple.get();
return (q.getGraph().isURI() || q.getGraph().isBlank()) && (q.getSubject().isURI() || q.getSubject().isBlank())
&& q.getPredicate().isURI() && (q.getObject().isURI() || q.getObject().isBlank() || q.getObject().isLiteral());
}
}