| /** |
| * 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.query; |
| |
| import com.thinkaurelius.titan.core.TitanEdge; |
| import com.thinkaurelius.titan.core.TitanGraphQuery; |
| import com.thinkaurelius.titan.core.TitanVertex; |
| import com.thinkaurelius.titan.core.attribute.Contain; |
| import com.thinkaurelius.titan.core.attribute.Text; |
| import com.thinkaurelius.titan.graphdb.query.TitanPredicate; |
| import org.apache.atlas.repository.graphdb.AtlasEdge; |
| import org.apache.atlas.repository.graphdb.AtlasGraphQuery.ComparisionOperator; |
| import org.apache.atlas.repository.graphdb.AtlasGraphQuery.MatchingOperator; |
| import org.apache.atlas.repository.graphdb.AtlasGraphQuery.QueryOperator; |
| import org.apache.atlas.repository.graphdb.AtlasVertex; |
| import org.apache.atlas.repository.graphdb.tinkerpop.query.NativeTinkerpopGraphQuery; |
| import org.apache.atlas.repository.graphdb.titan1.Titan1Edge; |
| import org.apache.atlas.repository.graphdb.titan1.Titan1Graph; |
| import org.apache.atlas.repository.graphdb.titan1.Titan1GraphDatabase; |
| import org.apache.atlas.repository.graphdb.titan1.Titan1Vertex; |
| import org.apache.tinkerpop.gremlin.process.traversal.Compare; |
| import org.apache.tinkerpop.gremlin.structure.Vertex; |
| |
| import java.util.*; |
| |
| /** |
| * Titan 1.0.0 implementation of NativeTinkerpopGraphQuery. |
| */ |
| public class NativeTitan1GraphQuery implements NativeTinkerpopGraphQuery<Titan1Vertex, Titan1Edge> { |
| |
| private Titan1Graph graph; |
| private TitanGraphQuery<?> query; |
| |
| public NativeTitan1GraphQuery(Titan1Graph graph) { |
| this.query = Titan1GraphDatabase.getGraphInstance().query(); |
| this.graph = graph; |
| } |
| |
| @Override |
| public Iterable<AtlasVertex<Titan1Vertex, Titan1Edge>> vertices() { |
| Iterable<TitanVertex> it = query.vertices(); |
| return graph.wrapVertices(it); |
| } |
| |
| @Override |
| public Iterable<AtlasEdge<Titan1Vertex, Titan1Edge>> edges() { |
| Iterable<TitanEdge> it = query.edges(); |
| return graph.wrapEdges(it); |
| } |
| |
| @Override |
| public Iterable<AtlasVertex<Titan1Vertex, Titan1Edge>> vertices(int limit) { |
| Iterable<TitanVertex> it = query.limit(limit).vertices(); |
| return graph.wrapVertices(it); |
| } |
| |
| @Override |
| public Iterable<AtlasVertex<Titan1Vertex, Titan1Edge>> vertices(int offset, int limit) { |
| List<Vertex> result = new ArrayList<>(limit); |
| Iterator<? extends Vertex> iter = query.limit(offset + limit).vertices().iterator(); |
| |
| for (long resultIdx = 0; iter.hasNext() && result.size() < limit; resultIdx++) { |
| if (resultIdx < offset) { |
| continue; |
| } |
| |
| result.add(iter.next()); |
| } |
| |
| return graph.wrapVertices(result); |
| } |
| |
| @Override |
| public void in(String propertyName, Collection<? extends Object> values) { |
| query.has(propertyName, Contain.IN, values); |
| |
| } |
| |
| @Override |
| public void has(String propertyName, QueryOperator op, Object value) { |
| TitanPredicate pred; |
| if (op instanceof ComparisionOperator) { |
| Compare c = getGremlinPredicate((ComparisionOperator) op); |
| pred = TitanPredicate.Converter.convert(c); |
| } else { |
| pred = getGremlinPredicate((MatchingOperator)op); |
| } |
| query.has(propertyName, pred, value); |
| } |
| |
| private Text getGremlinPredicate(MatchingOperator op) { |
| switch (op) { |
| case CONTAINS: |
| return Text.CONTAINS; |
| case PREFIX: |
| return Text.PREFIX; |
| case SUFFIX: |
| return Text.CONTAINS_REGEX; |
| case REGEX: |
| return Text.REGEX; |
| default: |
| throw new RuntimeException("Unsupported matching operator:" + op); |
| } |
| } |
| |
| private Compare getGremlinPredicate(ComparisionOperator op) { |
| switch (op) { |
| case EQUAL: |
| return Compare.eq; |
| case GREATER_THAN: |
| return Compare.gt; |
| case GREATER_THAN_EQUAL: |
| return Compare.gte; |
| case LESS_THAN: |
| return Compare.lt; |
| case LESS_THAN_EQUAL: |
| return Compare.lte; |
| case NOT_EQUAL: |
| return Compare.neq; |
| |
| default: |
| throw new RuntimeException("Unsupported comparison operator:" + op); |
| } |
| } |
| |
| } |