| /* |
| * 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.sideEffect; |
| |
| import org.apache.tinkerpop.gremlin.process.traversal.Path; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traversal; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traverser; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.ByModulating; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.PathProcessor; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.SideEffectCapable; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.TraversalParent; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.map.TreeStep; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.util.Tree; |
| import org.apache.tinkerpop.gremlin.process.traversal.traverser.TraverserRequirement; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.TraversalRing; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.TraversalUtil; |
| import org.apache.tinkerpop.gremlin.structure.util.StringFactory; |
| import org.apache.tinkerpop.gremlin.util.function.TreeSupplier; |
| |
| import java.util.List; |
| import java.util.Set; |
| import java.util.function.Supplier; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class TreeSideEffectStep<S> extends SideEffectStep<S> implements SideEffectCapable<Tree, Tree>, TraversalParent, ByModulating, PathProcessor { |
| |
| private TraversalRing<Object, Object> traversalRing; |
| private String sideEffectKey; |
| private Set<String> keepLabels; |
| |
| public TreeSideEffectStep(final Traversal.Admin traversal, final String sideEffectKey) { |
| super(traversal); |
| this.sideEffectKey = sideEffectKey; |
| this.traversalRing = new TraversalRing<>(); |
| this.getTraversal().getSideEffects().registerIfAbsent(this.sideEffectKey, (Supplier) TreeSupplier.instance(), TreeStep.TreeBiOperator.instance()); |
| } |
| |
| @Override |
| protected void sideEffect(final Traverser.Admin<S> traverser) { |
| final Tree root = new Tree(); |
| Tree depth = root; |
| final Path path = traverser.path(); |
| for (int i = 0; i < path.size(); i++) { |
| final Object object = TraversalUtil.apply(path.<Object>get(i), this.traversalRing.next()); |
| if (!depth.containsKey(object)) |
| depth.put(object, new Tree<>()); |
| depth = (Tree) depth.get(object); |
| } |
| this.traversalRing.reset(); |
| this.getTraversal().getSideEffects().add(this.sideEffectKey, root); |
| } |
| |
| @Override |
| protected Traverser.Admin<S> processNextStart() { |
| return PathProcessor.processTraverserPathLabels(super.processNextStart(), this.keepLabels); |
| } |
| |
| @Override |
| public String getSideEffectKey() { |
| return this.sideEffectKey; |
| } |
| |
| @Override |
| public void reset() { |
| super.reset(); |
| this.traversalRing.reset(); |
| } |
| |
| @Override |
| public String toString() { |
| return StringFactory.stepString(this, this.sideEffectKey, this.traversalRing); |
| } |
| |
| @Override |
| public TreeSideEffectStep<S> clone() { |
| final TreeSideEffectStep<S> clone = (TreeSideEffectStep<S>) super.clone(); |
| clone.traversalRing = this.traversalRing.clone(); |
| return clone; |
| } |
| |
| @Override |
| public void setTraversal(final Traversal.Admin<?, ?> parentTraversal) { |
| super.setTraversal(parentTraversal); |
| this.traversalRing.getTraversals().forEach(this::integrateChild); |
| } |
| |
| @Override |
| public int hashCode() { |
| return super.hashCode() ^ this.sideEffectKey.hashCode() ^ this.traversalRing.hashCode(); |
| } |
| |
| @Override |
| public List<Traversal.Admin<Object, Object>> getLocalChildren() { |
| return this.traversalRing.getTraversals(); |
| } |
| |
| @Override |
| public void modulateBy(final Traversal.Admin<?, ?> treeTraversal) { |
| this.traversalRing.addTraversal(this.integrateChild(treeTraversal)); |
| } |
| |
| @Override |
| public Set<TraverserRequirement> getRequirements() { |
| return this.getSelfAndChildRequirements(TraverserRequirement.PATH, TraverserRequirement.SIDE_EFFECTS); |
| } |
| |
| @Override |
| public void setKeepLabels(final Set<String> labels) { |
| this.keepLabels = labels; |
| } |
| |
| @Override |
| public Set<String> getKeepLabels() { |
| return this.keepLabels; |
| } |
| } |