| /** |
| * 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.query; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.NoSuchElementException; |
| |
| import org.apache.atlas.catalog.Request; |
| import org.apache.atlas.catalog.VertexWrapper; |
| import org.apache.atlas.catalog.definition.ResourceDefinition; |
| import org.apache.atlas.catalog.exception.ResourceNotFoundException; |
| import org.apache.atlas.catalog.projection.Projection; |
| import org.apache.atlas.catalog.projection.ProjectionResult; |
| import org.apache.atlas.repository.Constants; |
| import org.apache.atlas.repository.graph.AtlasGraphProvider; |
| import org.apache.atlas.repository.graphdb.AtlasElement; |
| import org.apache.atlas.repository.graphdb.AtlasGraph; |
| import org.apache.atlas.repository.graphdb.AtlasVertex; |
| import org.apache.atlas.typesystem.persistence.Id; |
| |
| import com.tinkerpop.blueprints.Compare; |
| import com.tinkerpop.blueprints.Vertex; |
| import com.tinkerpop.gremlin.java.GremlinPipeline; |
| import com.tinkerpop.pipes.Pipe; |
| import com.tinkerpop.pipes.filter.PropertyFilterPipe; |
| |
| /** |
| * Base Query implementation. |
| */ |
| public abstract class BaseQuery implements AtlasQuery { |
| protected final QueryExpression queryExpression; |
| protected final ResourceDefinition resourceDefinition; |
| protected final Request request; |
| |
| public BaseQuery(QueryExpression queryExpression, ResourceDefinition resourceDefinition, Request request) { |
| this.queryExpression = queryExpression; |
| this.resourceDefinition = resourceDefinition; |
| this.request = request; |
| } |
| |
| public Collection<Map<String, Object>> execute() throws ResourceNotFoundException { |
| Collection<Map<String, Object>> resultMaps = new ArrayList<>(); |
| |
| try { |
| for (Vertex vertex : executeQuery()) { |
| resultMaps.add(processPropertyMap(wrapVertex(vertex))); |
| } |
| getGraph().commit(); |
| } catch (Throwable t) { |
| getGraph().rollback(); |
| throw t; |
| } |
| return resultMaps; |
| } |
| |
| @Override |
| public Collection<Map<String, Object>> execute(Map<String, Object> updateProperties) |
| throws ResourceNotFoundException { |
| |
| Collection<Map<String, Object>> resultMaps = new ArrayList<>(); |
| try { |
| for (Vertex vertex : executeQuery()) { |
| VertexWrapper vWrapper = wrapVertex(vertex); |
| for (Map.Entry<String, Object> property : updateProperties.entrySet()) { |
| vWrapper.setProperty(property.getKey(), property.getValue()); |
| vWrapper.setProperty(Constants.MODIFICATION_TIMESTAMP_PROPERTY_KEY, System.currentTimeMillis()); |
| } |
| resultMaps.add(processPropertyMap(vWrapper)); |
| } |
| getGraph().commit(); |
| } catch (Throwable e) { |
| getGraph().rollback(); |
| throw e; |
| } |
| return resultMaps; |
| } |
| |
| private List<Vertex> executeQuery() { |
| GremlinPipeline pipeline = buildPipeline().as("root"); |
| Pipe expressionPipe = queryExpression.asPipe(); |
| |
| // AlwaysQuery returns null for pipe |
| return expressionPipe == null ? pipeline.toList() : |
| pipeline.add(expressionPipe).back("root").toList(); |
| } |
| |
| protected GremlinPipeline buildPipeline() { |
| GremlinPipeline pipeline = getRootVertexPipeline(); |
| Pipe queryPipe = getQueryPipe(); |
| if (queryPipe != null) { |
| pipeline.add(queryPipe); |
| } |
| pipeline.add(getNotDeletedPipe()); |
| return pipeline; |
| } |
| |
| protected abstract Pipe getQueryPipe(); |
| |
| protected GremlinPipeline getRootVertexPipeline() { |
| return new GremlinPipeline(unWrapVertices()); |
| } |
| |
| protected Iterable<Object> unWrapVertices() { |
| final Iterable<AtlasVertex> vertices = getGraph().getVertices(); |
| |
| Iterable<Object> vertexIterable = new Iterable<Object>() { |
| Iterator<Object> iterator = new Iterator<Object>() { |
| Iterator<AtlasVertex> wrapperIterator = vertices.iterator(); |
| |
| @Override |
| public boolean hasNext() { |
| return wrapperIterator.hasNext(); |
| } |
| |
| @Override |
| public Object next() { |
| if (hasNext()) { |
| return ((AtlasElement) wrapperIterator.next().getV()).getWrappedElement(); |
| } else { |
| throw new NoSuchElementException(); |
| } |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException("Remove not supported"); |
| } |
| }; |
| |
| @Override |
| public Iterator<Object> iterator() { |
| return iterator; |
| } |
| }; |
| return vertexIterable; |
| } |
| |
| protected Pipe getNotDeletedPipe() { |
| return new PropertyFilterPipe(Constants.STATE_PROPERTY_KEY, Compare.EQUAL, |
| Id.EntityState.ACTIVE.name()); |
| } |
| |
| protected Map<String, Object> processPropertyMap(VertexWrapper vertex) { |
| Map<String, Object> propertyMap = resourceDefinition.filterProperties( |
| request, vertex.getPropertyMap()); |
| addHref(vertex, propertyMap); |
| |
| return request.getCardinality() == Request.Cardinality.INSTANCE ? |
| applyProjections(vertex, propertyMap) : |
| propertyMap; |
| } |
| |
| protected void addHref(VertexWrapper vWrapper, Map<String, Object> filteredPropertyMap) { |
| String href = resourceDefinition.resolveHref(filteredPropertyMap); |
| if (href != null) { |
| filteredPropertyMap.put("href", href); |
| } |
| } |
| |
| protected Map<String, Object> applyProjections(VertexWrapper vertex, Map<String, Object> propertyMap) { |
| for (Projection p : resourceDefinition.getProjections().values()) { |
| for (ProjectionResult projectionResult : p.values(vertex)) { |
| if (p.getCardinality() == Projection.Cardinality.MULTIPLE) { |
| propertyMap.put(projectionResult.getName(), projectionResult.getPropertyMaps()); |
| } else { |
| for (Map<String, Object> projectionMap : projectionResult.getPropertyMaps()) { |
| propertyMap.put(projectionResult.getName(), projectionMap); |
| } |
| } |
| } |
| } |
| return propertyMap; |
| } |
| |
| protected QueryExpression getQueryExpression() { |
| return queryExpression; |
| } |
| |
| protected ResourceDefinition getResourceDefinition() { |
| return resourceDefinition; |
| } |
| |
| protected Request getRequest() { |
| return request; |
| } |
| |
| // Underlying method is synchronized and caches the graph in a static field |
| protected AtlasGraph getGraph() { |
| return AtlasGraphProvider.getGraphInstance(); |
| } |
| |
| protected VertexWrapper wrapVertex(Vertex v) { |
| return new VertexWrapper(v, resourceDefinition); |
| } |
| } |