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/*
* 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.rya.indexing.external.matching;
import org.eclipse.rdf4j.query.algebra.Filter;
import org.eclipse.rdf4j.query.algebra.Join;
import org.eclipse.rdf4j.query.algebra.LeftJoin;
import org.eclipse.rdf4j.query.algebra.Projection;
import org.eclipse.rdf4j.query.algebra.TupleExpr;
public class MatcherUtilities {
public static boolean segmentContainsLeftJoins(final TupleExpr tupleExpr) {
if (tupleExpr instanceof Projection) {
return segmentContainsLeftJoins(((Projection) tupleExpr).getArg());
} else if (tupleExpr instanceof Join) {
final Join join = (Join) tupleExpr;
return segmentContainsLeftJoins(join.getRightArg())
|| segmentContainsLeftJoins(join.getLeftArg());
} else if (tupleExpr instanceof LeftJoin) {
return true;
} else if (tupleExpr instanceof Filter) {
return segmentContainsLeftJoins(((Filter) tupleExpr).getArg());
} else {
return false;
}
}
}