| /* |
| * 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.druid.segment; |
| |
| import com.google.common.base.Preconditions; |
| import it.unimi.dsi.fastutil.ints.AbstractIntList; |
| import it.unimi.dsi.fastutil.ints.IntList; |
| |
| public class IntListUtils |
| { |
| private IntListUtils() |
| { |
| } |
| |
| public static IntList fromTo(int from, int to) |
| { |
| Preconditions.checkArgument(from <= to); |
| return new RangeIntList(from, to); |
| } |
| |
| private static final class RangeIntList extends AbstractIntList |
| { |
| private final int start; |
| private final int size; |
| |
| RangeIntList(int start, int end) |
| { |
| this.start = start; |
| this.size = end - start; |
| } |
| |
| @Override |
| public int getInt(int index) |
| { |
| Preconditions.checkElementIndex(index, size); |
| return start + index; |
| } |
| |
| @Override |
| public int size() |
| { |
| return size; |
| } |
| } |
| } |