| /* |
| * 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.hugegraph.traversal.optimize; |
| |
| import java.util.NoSuchElementException; |
| import java.util.Objects; |
| |
| import org.apache.tinkerpop.gremlin.process.traversal.Step; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traversal; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traverser.Admin; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.FastNoSuchElementException; |
| import org.apache.tinkerpop.gremlin.structure.Element; |
| |
| import org.apache.hugegraph.util.E; |
| |
| public final class HugeCountStep<S extends Element> |
| extends AbstractStep<S, Long> { |
| |
| private static final long serialVersionUID = -679873894532085972L; |
| |
| private final HugeGraphStep<?, S> originGraphStep; |
| private boolean done = false; |
| |
| public HugeCountStep(final Traversal.Admin<?, ?> traversal, |
| final HugeGraphStep<?, S> originGraphStep) { |
| super(traversal); |
| E.checkNotNull(originGraphStep, "originGraphStep"); |
| this.originGraphStep = originGraphStep; |
| } |
| |
| public boolean equals(Object obj) { |
| if (!(obj instanceof HugeCountStep)) { |
| return false; |
| } |
| |
| if (!super.equals(obj)) { |
| return false; |
| } |
| |
| HugeCountStep other = (HugeCountStep) obj; |
| return Objects.equals(this.originGraphStep, |
| other.originGraphStep) && this.done == other.done; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(super.hashCode(), this.originGraphStep, this.done); |
| } |
| |
| @Override |
| protected Admin<Long> processNextStart() throws NoSuchElementException { |
| if (this.done) { |
| throw FastNoSuchElementException.instance(); |
| } |
| this.done = true; |
| @SuppressWarnings({ "unchecked", "rawtypes" }) |
| Step<Long, Long> step = (Step) this; |
| return this.getTraversal().getTraverserGenerator() |
| .generate(this.originGraphStep.count(), step, 1L); |
| } |
| } |