| /* |
| * 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.tinkerpop.gremlin.process.traversal.step.map; |
| |
| import org.apache.tinkerpop.gremlin.process.traversal.Traversal; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traverser; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.Configuring; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.util.Parameters; |
| import org.apache.tinkerpop.gremlin.process.traversal.traverser.TraverserRequirement; |
| import org.apache.tinkerpop.gremlin.structure.Direction; |
| import org.apache.tinkerpop.gremlin.structure.Edge; |
| import org.apache.tinkerpop.gremlin.structure.Element; |
| import org.apache.tinkerpop.gremlin.structure.Vertex; |
| import org.apache.tinkerpop.gremlin.structure.util.StringFactory; |
| |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public class VertexStep<E extends Element> extends FlatMapStep<Vertex, E> implements AutoCloseable, Configuring { |
| |
| protected Parameters parameters = new Parameters(); |
| private final String[] edgeLabels; |
| private Direction direction; |
| private final Class<E> returnClass; |
| |
| public VertexStep(final Traversal.Admin traversal, final Class<E> returnClass, final Direction direction, final String... edgeLabels) { |
| super(traversal); |
| this.direction = direction; |
| this.edgeLabels = edgeLabels; |
| this.returnClass = returnClass; |
| } |
| |
| @Override |
| public Parameters getParameters() { |
| return this.parameters; |
| } |
| |
| @Override |
| public void configure(final Object... keyValues) { |
| this.parameters.set(null, keyValues); |
| } |
| |
| @Override |
| protected Iterator<E> flatMap(final Traverser.Admin<Vertex> traverser) { |
| return Vertex.class.isAssignableFrom(this.returnClass) ? |
| (Iterator<E>) traverser.get().vertices(this.direction, this.edgeLabels) : |
| (Iterator<E>) traverser.get().edges(this.direction, this.edgeLabels); |
| } |
| |
| public Direction getDirection() { |
| return this.direction; |
| } |
| |
| public String[] getEdgeLabels() { |
| return this.edgeLabels; |
| } |
| |
| public Class<E> getReturnClass() { |
| return this.returnClass; |
| } |
| |
| public void reverseDirection() { |
| this.direction = this.direction.opposite(); |
| } |
| |
| public boolean returnsVertex() { |
| return this.returnClass.equals(Vertex.class); |
| } |
| |
| public boolean returnsEdge() { |
| return this.returnClass.equals(Edge.class); |
| } |
| |
| @Override |
| public String toString() { |
| return StringFactory.stepString(this, this.direction, Arrays.asList(this.edgeLabels), this.returnClass.getSimpleName().toLowerCase()); |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = super.hashCode() ^ this.direction.hashCode() ^ this.returnClass.hashCode(); |
| for (final String edgeLabel : this.edgeLabels) { |
| result ^= edgeLabel.hashCode(); |
| } |
| return result; |
| } |
| |
| @Override |
| public Set<TraverserRequirement> getRequirements() { |
| return Collections.singleton(TraverserRequirement.OBJECT); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| closeIterator(); |
| } |
| } |