| /** |
| * 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 |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * 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.catalog.projection; |
| |
| import com.tinkerpop.pipes.PipeFunction; |
| import com.tinkerpop.pipes.transform.TransformFunctionPipe; |
| import org.apache.atlas.catalog.ResourceComparator; |
| import org.apache.atlas.catalog.VertexWrapper; |
| |
| import java.util.*; |
| |
| /** |
| * Projection based on a relation. |
| */ |
| public class RelationProjection extends Projection { |
| |
| private Relation relation; |
| public RelationProjection(String name, final Collection<String> fields, final Relation relation, Cardinality cardinality) { |
| super(name, cardinality, new TransformFunctionPipe<>( |
| new PipeFunction<VertexWrapper, Collection<ProjectionResult>>() { |
| @Override |
| public Collection<ProjectionResult> compute(VertexWrapper start) { |
| Collection<ProjectionResult> projectionResults = new ArrayList<>(); |
| |
| for (RelationSet relationSet : relation.traverse(start)) { |
| Collection<Map<String, Object>> propertyMaps = new ArrayList<>(); |
| |
| for (VertexWrapper vWrapper : relationSet.getVertices()) { |
| Map<String, Object> propertyMap = new TreeMap<>(new ResourceComparator()); |
| propertyMaps.add(propertyMap); |
| |
| if (fields.isEmpty()) { |
| for (String property : vWrapper.getPropertyKeys()) { |
| propertyMap.put(property, vWrapper.<String>getProperty(property)); |
| } |
| } else { |
| for (String property : fields) { |
| propertyMap.put(property, vWrapper.<String>getProperty(property)); |
| } |
| } |
| } |
| projectionResults.add(new ProjectionResult(relationSet.getName(), start, propertyMaps)); |
| } |
| return projectionResults; |
| } |
| })); |
| this.relation = relation; |
| } |
| |
| public Relation getRelation() { |
| return relation; |
| } |
| } |