blob: 553bb6a98c3968e289887632b510d9df751048c8 [file] [log] [blame]
/*
* 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;
}
}