/* * 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 java.util.Collections; import java.util.Iterator; import java.util.Set; import static org.apache.tinkerpop.gremlin.util.NumberHelper.min; /** * @author Marko A. Rodriguez (http://markorodriguez.com) * @author Daniel Kuppitz (http://gremlin.guru) */ public final class MinLocalStep<E extends Number, S extends Iterable<E>> extends MapStep<S, E> { public MinLocalStep(final Traversal.Admin traversal) { super(traversal); } @Override protected E map(final Traverser.Admin<S> traverser) { Number result; final Iterator<E> iterator = traverser.get().iterator(); if (iterator.hasNext()) { result = iterator.next(); while (iterator.hasNext()) { result = min(iterator.next(), result); } } else { result = Double.NaN; } return (E) result; } @Override public Set<TraverserRequirement> getRequirements() { return Collections.singleton(TraverserRequirement.OBJECT); } }