| package org.apache.rya.api.query.strategy.wholerow; |
| |
| /* |
| * 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 static org.apache.rya.api.RdfCloudTripleStoreConstants.LAST_BYTES; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| import org.apache.rya.api.RdfCloudTripleStoreConfiguration; |
| import org.apache.rya.api.RdfCloudTripleStoreConstants.TABLE_LAYOUT; |
| import org.apache.rya.api.RdfCloudTripleStoreUtils; |
| import org.apache.rya.api.domain.RyaType; |
| import org.apache.rya.api.domain.RyaIRI; |
| import org.apache.rya.api.query.strategy.AbstractTriplePatternStrategy; |
| import org.apache.rya.api.query.strategy.ByteRange; |
| |
| public class NullRowTriplePatternStrategy extends AbstractTriplePatternStrategy { |
| |
| @Override |
| public TABLE_LAYOUT getLayout() { |
| return TABLE_LAYOUT.SPO; |
| } |
| |
| @Override |
| public Map.Entry<TABLE_LAYOUT, ByteRange> defineRange(RyaIRI subject, RyaIRI predicate, RyaType object, |
| RyaIRI context, RdfCloudTripleStoreConfiguration conf) throws IOException { |
| byte[] start = new byte[]{ /* empty array */ }; // Scan from the beginning of the Accumulo Table |
| byte[] stop = LAST_BYTES; // Scan to the end, up through things beginning with 0xff. |
| return new RdfCloudTripleStoreUtils.CustomEntry<>(TABLE_LAYOUT.SPO, new ByteRange(start, stop)); |
| } |
| |
| @Override |
| public boolean handles(RyaIRI subject, RyaIRI predicate, RyaType object, RyaIRI context) { |
| return subject == null && predicate == null && object == null; |
| } |
| } |