| /* |
| * 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.traverser.TraverserRequirement; |
| import org.apache.tinkerpop.gremlin.util.iterator.ArrayIterator; |
| import org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils; |
| |
| import java.lang.reflect.Array; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class UnfoldStep<S, E> extends FlatMapStep<S, E> { |
| |
| public UnfoldStep(final Traversal.Admin traversal) { |
| super(traversal); |
| } |
| |
| @Override |
| protected Iterator<E> flatMap(final Traverser.Admin<S> traverser) { |
| final S s = traverser.get(); |
| if (s instanceof Iterator) |
| return (Iterator) s; |
| else if (s instanceof Iterable) |
| return ((Iterable) s).iterator(); |
| else if (s instanceof Map) |
| return ((Map) s).entrySet().iterator(); |
| else if (s.getClass().isArray()) |
| return handleArrays(s); |
| else |
| return IteratorUtils.of((E) s); |
| } |
| |
| @Override |
| public Set<TraverserRequirement> getRequirements() { |
| return Collections.singleton(TraverserRequirement.OBJECT); |
| } |
| |
| private final Iterator<E> handleArrays(final Object array) { |
| if (array instanceof Object[]) { |
| return new ArrayIterator<>((E[]) array); |
| } else { |
| int len = Array.getLength(array); |
| final Object[] objectArray = new Object[len]; |
| for (int i = 0; i < len; i++) |
| objectArray[i] = Array.get(array, i); |
| return new ArrayIterator<>((E[]) objectArray); |
| } |
| } |
| } |