| /* |
| * 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; |
| |
| import org.apache.jena.graph.Triple ; |
| import org.apache.jena.util.iterator.ExtendedIterator ; |
| |
| /** |
| * Minimal interface for preforming simple pattern find operations. |
| * Should be implemented by reasoners, caches and related datastructures. |
| */ |
| public interface Finder { |
| |
| /** |
| * Basic pattern lookup interface. |
| * @param pattern a TriplePattern to be matched against the data |
| * @return a ClosableIterator over all Triples in the data set |
| * that match the pattern |
| */ |
| public ExtendedIterator<Triple> find(TriplePattern pattern); |
| |
| /** |
| * Extended find interface used in situations where the implementator |
| * may or may not be able to answer the complete query. It will |
| * attempt to answer the pattern but if its answers are not known |
| * to be complete then it will also pass the request on to the nested |
| * Finder to append more results. |
| * @param pattern a TriplePattern to be matched against the data |
| * @param continuation either a Finder or a normal Graph which |
| * will be asked for additional match results if the implementor |
| * may not have completely satisfied the query. |
| */ |
| public ExtendedIterator<Triple> findWithContinuation(TriplePattern pattern, Finder continuation); |
| |
| /** |
| * Return true if the given pattern occurs somewhere in the find sequence. |
| */ |
| public boolean contains(TriplePattern pattern); |
| |
| } |