| /* |
| * 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.util; |
| |
| import org.apache.tinkerpop.gremlin.structure.Element; |
| |
| import java.io.Serializable; |
| import java.util.Comparator; |
| import java.util.function.Function; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class ElementFunctionComparator<V> implements Comparator<Element>, Serializable { |
| |
| private final Function<Element, V> elementFunction; |
| private final Comparator<V> valueComparator; |
| |
| public ElementFunctionComparator(final Function<Element, V> elementFunction, final Comparator<V> valueComparator) { |
| this.elementFunction = elementFunction; |
| this.valueComparator = valueComparator; |
| } |
| |
| public Function<Element, V> getElementFunction() { |
| return this.elementFunction; |
| } |
| |
| public Comparator<V> getValueComparator() { |
| return this.valueComparator; |
| } |
| |
| @Override |
| public int compare(final Element elementA, final Element elementB) { |
| return this.valueComparator.compare(this.elementFunction.apply(elementA), this.elementFunction.apply(elementB)); |
| } |
| |
| @Override |
| public String toString() { |
| return this.valueComparator.toString() + "(" + this.elementFunction + ')'; |
| } |
| } |