| /* |
| * Copyright 2017 HugeGraph Authors |
| * |
| * 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 com.baidu.hugegraph.computer.core.sort.sorting; |
| |
| import java.util.Collection; |
| import java.util.Comparator; |
| import java.util.Iterator; |
| |
| import com.baidu.hugegraph.util.E; |
| |
| public abstract class AbstractInputsSorting<T> implements InputsSorting<T> { |
| |
| protected final Iterator<T>[] sources; |
| protected final Comparator<? super T> comparator; |
| |
| @SuppressWarnings("unchecked") |
| public AbstractInputsSorting(Collection<? extends Iterator<T>> sources, |
| Comparator<? super T> comparator) { |
| E.checkNotEmpty(sources, "sources"); |
| |
| this.sources = sources.toArray(new Iterator[0]); |
| this.comparator = comparator; |
| } |
| |
| protected final int compare(T t1, T t2) { |
| @SuppressWarnings("unchecked") |
| int result = this.comparator != null ? |
| this.comparator.compare(t1, t2) : |
| ((Comparable<? super T>) t1).compareTo(t2); |
| return result; |
| } |
| } |