| /* |
| * 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.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.LambdaHolder; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.TraversalParent; |
| import org.apache.tinkerpop.gremlin.process.traversal.traverser.TraverserRequirement; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.TraversalUtil; |
| import org.apache.tinkerpop.gremlin.structure.util.StringFactory; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.function.BiFunction; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class SackValueStep<S, A, B> extends SideEffectStep<S> implements TraversalParent, ByModulating, LambdaHolder { |
| |
| private Traversal.Admin<S, B> sackTraversal = null; |
| |
| private BiFunction<A, B, A> sackFunction; |
| |
| public SackValueStep(final Traversal.Admin traversal, final BiFunction<A, B, A> sackFunction) { |
| super(traversal); |
| this.sackFunction = sackFunction; |
| } |
| |
| @Override |
| public void modulateBy(final Traversal.Admin<?, ?> sackTraversal) { |
| this.sackTraversal = this.integrateChild(sackTraversal); |
| } |
| |
| @Override |
| public List<Traversal.Admin<S, B>> getLocalChildren() { |
| return null == this.sackTraversal ? Collections.emptyList() : Collections.singletonList(this.sackTraversal); |
| } |
| |
| @Override |
| protected void sideEffect(final Traverser.Admin<S> traverser) { |
| traverser.sack(this.sackFunction.apply(traverser.sack(), null == this.sackTraversal ? (B) traverser.get() : TraversalUtil.apply(traverser, this.sackTraversal))); |
| } |
| |
| @Override |
| public String toString() { |
| return StringFactory.stepString(this, this.sackFunction, this.sackTraversal); |
| } |
| |
| @Override |
| public int hashCode() { |
| return super.hashCode() ^ this.sackFunction.hashCode() ^ ((null == this.sackTraversal) ? "null".hashCode() : this.sackTraversal.hashCode()); |
| } |
| |
| public BiFunction<A, B, A> getSackFunction() { |
| return this.sackFunction; |
| } |
| |
| @Override |
| public Set<TraverserRequirement> getRequirements() { |
| return getSelfAndChildRequirements(TraverserRequirement.SACK); |
| } |
| |
| @Override |
| public SackValueStep<S, A, B> clone() { |
| final SackValueStep<S, A, B> clone = (SackValueStep<S, A, B>) super.clone(); |
| if (null != this.sackTraversal) |
| clone.sackTraversal = this.sackTraversal.clone(); |
| return clone; |
| } |
| |
| @Override |
| public void setTraversal(final Traversal.Admin<?, ?> parentTraversal) { |
| super.setTraversal(parentTraversal); |
| this.integrateChild(this.sackTraversal); |
| } |
| } |