| /** |
| * 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; |
| /* |
| * 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. |
| */ |
| |
| import org.openrdf.query.algebra.Filter; |
| import org.openrdf.query.algebra.Join; |
| import org.openrdf.query.algebra.LeftJoin; |
| import org.openrdf.query.algebra.Projection; |
| import org.openrdf.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; |
| } |
| } |
| |
| } |