/* * 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.eagle.query.aggregate.raw; import org.apache.hadoop.hbase.util.Bytes; import org.apache.hadoop.io.BytesWritable; import java.util.Comparator; import java.util.List; import java.util.ListIterator; public class GroupbyKeyComparator implements Comparator<GroupbyKey> { @Override public int compare(GroupbyKey key1, GroupbyKey key2) { List<BytesWritable> list1 = key1.getValue(); List<BytesWritable> list2 = key2.getValue(); if (list1 == null || list2 == null || list1.size() != list2.size()) { throw new IllegalArgumentException("2 list of groupby fields must be non-null and have the same size"); } ListIterator<BytesWritable> e1 = list1.listIterator(); ListIterator<BytesWritable> e2 = list2.listIterator(); while (e1.hasNext() && e2.hasNext()) { int r = Bytes.compareTo(e1.next().copyBytes(), e2.next().copyBytes()); if (r != 0) { return r; } } return 0; } }