| /** |
| * 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.atlas.repository.graphdb.titan1; |
| |
| import java.util.Iterator; |
| |
| import com.google.common.base.Preconditions; |
| import org.apache.atlas.repository.graphdb.AtlasIndexQuery; |
| import org.apache.atlas.repository.graphdb.AtlasVertex; |
| |
| import com.google.common.base.Function; |
| import com.google.common.collect.Iterators; |
| import com.thinkaurelius.titan.core.TitanIndexQuery; |
| import com.thinkaurelius.titan.core.TitanVertex; |
| |
| /** |
| * Titan 1.0.0 implementation of AtlasIndexQuery. |
| */ |
| public class Titan1IndexQuery implements AtlasIndexQuery<Titan1Vertex, Titan1Edge> { |
| |
| private Titan1Graph graph; |
| private TitanIndexQuery query; |
| |
| public Titan1IndexQuery(Titan1Graph graph, TitanIndexQuery query) { |
| this.query = query; |
| this.graph = graph; |
| } |
| |
| @Override |
| public Iterator<Result<Titan1Vertex, Titan1Edge>> vertices() { |
| Iterator<TitanIndexQuery.Result<TitanVertex>> results = query.vertices().iterator(); |
| |
| Function<TitanIndexQuery.Result<TitanVertex>, Result<Titan1Vertex, Titan1Edge>> function = |
| new Function<TitanIndexQuery.Result<TitanVertex>, Result<Titan1Vertex, Titan1Edge>>() { |
| |
| @Override |
| public Result<Titan1Vertex, Titan1Edge> apply(TitanIndexQuery.Result<TitanVertex> source) { |
| return new ResultImpl(source); |
| } |
| }; |
| |
| return Iterators.transform(results, function); |
| } |
| |
| @Override |
| public Iterator<Result<Titan1Vertex, Titan1Edge>> vertices(int offset, int limit) { |
| Preconditions.checkArgument(offset >=0, "Index offset should be greater than or equals to 0"); |
| Preconditions.checkArgument(limit >=0, "Index limit should be greater than or equals to 0"); |
| Iterator<TitanIndexQuery.Result<TitanVertex>> results = query |
| .offset(offset) |
| .limit(limit) |
| .vertices().iterator(); |
| |
| Function<TitanIndexQuery.Result<TitanVertex>, Result<Titan1Vertex, Titan1Edge>> function = |
| new Function<TitanIndexQuery.Result<TitanVertex>, Result<Titan1Vertex, Titan1Edge>>() { |
| |
| @Override |
| public Result<Titan1Vertex, Titan1Edge> apply(TitanIndexQuery.Result<TitanVertex> source) { |
| return new ResultImpl(source); |
| } |
| }; |
| |
| return Iterators.transform(results, function); |
| } |
| |
| /** |
| * Titan 1.0.0 implementation of AtlasIndexQuery.Result. |
| */ |
| public final class ResultImpl implements AtlasIndexQuery.Result<Titan1Vertex, Titan1Edge> { |
| private TitanIndexQuery.Result<TitanVertex> source; |
| |
| public ResultImpl(TitanIndexQuery.Result<TitanVertex> source) { |
| this.source = source; |
| } |
| |
| @Override |
| public AtlasVertex<Titan1Vertex, Titan1Edge> getVertex() { |
| return GraphDbObjectFactory.createVertex(graph, source.getElement()); |
| } |
| |
| @Override |
| public double getScore() { |
| return source.getScore(); |
| } |
| } |
| } |