aai-core/src/main/java/org/onap/aai/serialization/engines/query/GraphTraversalQueryEngine.java

   1 /**
   2  * ============LICENSE_START=======================================================
   3  * org.onap.aai
   4  * ================================================================================
   5  * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *    http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  *
  20  * ECOMP is a trademark and service mark of AT&T Intellectual Property.
  21  */
  22 package org.onap.aai.serialization.engines.query;
  23
  24
  25 import static org.onap.aai.serialization.db.AAIDirection.IN;
  26 import static org.onap.aai.serialization.db.AAIDirection.NONE;
  27 import static org.onap.aai.serialization.db.AAIDirection.OUT;
  28 import static org.onap.aai.serialization.db.EdgeProperty.CONTAINS;
  29 import static org.onap.aai.serialization.db.EdgeProperty.DELETE_OTHER_V;
  30
  31 import java.util.List;
  32 import java.util.Set;
  33
  34 import org.apache.tinkerpop.gremlin.process.traversal.P;
  35 import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
  36 import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
  37 import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__;
  38 import org.apache.tinkerpop.gremlin.process.traversal.step.util.Tree;
  39 import org.apache.tinkerpop.gremlin.structure.Direction;
  40 import org.apache.tinkerpop.gremlin.structure.Edge;
  41 import org.apache.tinkerpop.gremlin.structure.Element;
  42 import org.apache.tinkerpop.gremlin.structure.Vertex;
  43 import org.onap.aai.db.props.AAIProperties;
  44 import org.onap.aai.introspection.Loader;
  45
  46 /*
  47  * This class needs some big explanation despite its compact size.
  48  * This controls all the queries performed by the CRUD API in A&AI.
  49  * findParents, findChildren, and findDeletable require special attention
  50  *   These methods use 'repeat'. You cannot use 'emit' with repeat currently
  51  *   as it is extremely buggy as of tinkerpop-3.0.1-incubating. The way around
  52  *   it (for now) is to sideEffect all the vertices we traverse into an ArrayList.
  53  *
  54  */
  55 public class GraphTraversalQueryEngine extends QueryEngine {
  56
  57         /**
  58          * Instantiates a new graph traversal query engine.
  59          *
  60          * @param graphEngine the graph engine
  61          */
  62         public GraphTraversalQueryEngine(GraphTraversalSource g) {
  63                 super(g);
  64         }
  65
  66         /**
  67          * {@inheritDoc}
  68          */
  69         @Override
  70         public List<Vertex> findParents(Vertex start) {
  71
  72                 final GraphTraversal<Vertex, Vertex> pipe = this.g.V(start).emit(v -> true).repeat(__.union(__.inE().has(CONTAINS.toString(), OUT.toString()).outV(), __.outE().has(CONTAINS.toString(), IN.toString()).inV()));
  73                 return pipe.toList();
  74         }
  75
  76         /**
  77          * {@inheritDoc}
  78          */
  79         @Override
  80         public List<Vertex> findAllChildren(Vertex start) {
  81
  82                 GraphTraversal<Vertex, Vertex> pipe =  this.g
  83                                 .V(start).emit(v -> true).repeat(__.union(__.outE().has(CONTAINS.toString(), OUT.toString()).inV(), __.inE().has(CONTAINS.toString(), IN.toString()).outV()));
  84
  85
  86                 return pipe.toList();
  87
  88         }
  89
  90         public List<Vertex> findChildrenOfType(Vertex start, String type) {
  91                 GraphTraversal<Vertex, Vertex> pipe =  this.g.V(start).union(
  92                                         __.outE().has(CONTAINS.toString(), OUT.toString()).inV(),
  93                                         __.inE().has(CONTAINS.toString(), IN.toString()).outV()
  94                                 ).has(AAIProperties.NODE_TYPE, type).dedup();
  95
  96                 return pipe.toList();
  97         }
  98
  99         public List<Vertex> findChildren(Vertex start) {
 100                 GraphTraversal<Vertex, Vertex> pipe =  this.g.V(start).union(
 101                                         __.outE().has(CONTAINS.toString(), OUT.toString()),
 102                                         __.inE().has(CONTAINS.toString(), IN.toString())
 103                                 ).otherV().dedup();
 104
 105                 return pipe.toList();
 106         }
 107
 108         /**
 109          * {@inheritDoc}
 110          */
 111         @Override
 112         public List<Vertex> findDeletable(Vertex start) {
 113                 GraphTraversal<Vertex, Vertex> pipe = this.g
 114                                 .V(start).emit(v -> true).repeat(
 115                                         __.union(
 116                                                 __.outE().has(DELETE_OTHER_V.toString(), OUT.toString()).inV(),
 117                                                 __.inE().has(DELETE_OTHER_V.toString(), IN.toString()).outV()
 118                                         )
 119                                 );
 120
 121                 return pipe.toList();
 122         }
 123
 124         /**
 125          * {@inheritDoc}
 126          */
 127         @Override
 128         public List<Vertex> findRelatedVertices(Vertex start, Direction direction, String label, String nodeType) {
 129                 GraphTraversal<Vertex, Vertex> pipe = this.g.V(start);
 130                 switch (direction) {
 131                         case OUT:
 132                                 pipe.out(label);
 133                                 break;
 134                         case IN:
 135                                 pipe.in(label);
 136                                 break;
 137                         case BOTH:
 138                                 pipe.both(label);
 139                                 break;
 140                          default:
 141                                 break;
 142                 }
 143
 144                 pipe.has(AAIProperties.NODE_TYPE, nodeType).dedup();
 145                 return pipe.toList();
 146         }
 147
 148         @Override
 149         public Tree<Element> findSubGraph(Vertex start, int iterations, boolean nodeOnly) {
 150                 final GraphTraversal<Vertex, ?> t = this.g.V(start).emit(v -> true).times(iterations).repeat(
 151                                 __.union(
 152                                         __.outE().has(CONTAINS.toString(), OUT.toString()).inV(),
 153                                         __.inE().has(CONTAINS.toString(), IN.toString()).outV())
 154                                 );
 155
 156                 if (!nodeOnly) {
 157                         t.union(
 158                                         __.identity(),
 159                                         __.bothE().has(CONTAINS.toString(), NONE.toString()).dedup().otherV()
 160                         );
 161                 }
 162                 t.tree();
 163                 if (t.hasNext()) {
 164                         return (Tree)t.next();
 165                 } else {
 166                         return new Tree();
 167                 }
 168         }
 169
 170         @Override
 171         public List<Edge> findEdgesForVersion(Vertex start, Loader loader) {
 172                 final Set<String> objects = loader.getAllObjects().keySet();
 173                 GraphTraversal<Vertex, Edge> pipeline = this.g.V(start).union(
 174                                 __.inE().has(CONTAINS.toString(), NONE.toString()).where(__.outV().has(AAIProperties.NODE_TYPE, P.within(objects))),
 175                                 __.outE().has(CONTAINS.toString(), NONE.toString()).where(__.inV().has(AAIProperties.NODE_TYPE, P.within(objects)))
 176                         ).dedup();
 177
 178                 return pipeline.toList();
 179         }
 180
 181
 182         @Override
 183         public List<Vertex> findCousinVertices(Vertex start) {
 184                 GraphTraversal<Vertex, Vertex> pipeline = this.g.V(start).union(
 185                                 __.inE().has(CONTAINS.toString(), NONE.toString()),
 186                                 __.outE().has(CONTAINS.toString(), NONE.toString())).otherV().dedup();
 187
 188                 return pipeline.toList();
 189         }
 190
 191 }
 192