unsafe/sort/PrefixComparator.java

0001 /*
0002  * Licensed to the Apache Software Foundation (ASF) under one or more
0003  * contributor license agreements.  See the NOTICE file distributed with
0004  * this work for additional information regarding copyright ownership.
0005  * The ASF licenses this file to You under the Apache License, Version 2.0
0006  * (the "License"); you may not use this file except in compliance with
0007  * the License.  You may obtain a copy of the License at
0008  *
0009  *    http://www.apache.org/licenses/LICENSE-2.0
0010  *
0011  * Unless required by applicable law or agreed to in writing, software
0012  * distributed under the License is distributed on an "AS IS" BASIS,
0013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014  * See the License for the specific language governing permissions and
0015  * limitations under the License.
0016  */
0017
0018 package org.apache.spark.util.collection.unsafe.sort;
0019
0020 import org.apache.spark.annotation.Private;
0021
0022 /**
0023  * Compares 8-byte key prefixes in prefix sort. Subclasses may implement type-specific
0024  * comparisons, such as lexicographic comparison for strings.
0025  */
0026 @Private
0027 public abstract class PrefixComparator {
0028   public abstract int compare(long prefix1, long prefix2);
0029 }