| /* |
| * 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.data; |
| |
| import org.apache.druid.guice.annotations.PublicApi; |
| import org.apache.druid.query.monomorphicprocessing.CalledFromHotLoop; |
| import org.apache.druid.query.monomorphicprocessing.HotLoopCallee; |
| |
| import java.util.function.IntConsumer; |
| |
| /** |
| * Get a int an index (array or list lookup abstraction without boxing). |
| * |
| * Doesn't extend {@link Iterable} (or {@link it.unimi.dsi.fastutil.ints.IntIterable} to avoid accidental |
| * for-each iteration with boxing. |
| */ |
| @PublicApi |
| public interface IndexedInts extends HotLoopCallee |
| { |
| static IndexedInts empty() |
| { |
| return ArrayBasedIndexedInts.EMPTY; |
| } |
| |
| @CalledFromHotLoop |
| int size(); |
| |
| @CalledFromHotLoop |
| int get(int index); |
| |
| default void get(int[] out, int start, int length) |
| { |
| for (int i = 0; i < length; i++) { |
| out[i] = get(i + start); |
| } |
| } |
| |
| default void get(int[] out, int[] indexes, int length) |
| { |
| for (int i = 0; i < length; i++) { |
| out[i] = get(indexes[i]); |
| } |
| } |
| |
| default void forEach(IntConsumer action) |
| { |
| int size = size(); |
| for (int i = 0; i < size; i++) { |
| action.accept(get(i)); |
| } |
| } |
| |
| @SuppressWarnings("unused") // Set up your IDE to render IndexedInts impls using this method during debug. |
| default String debugToString() |
| { |
| StringBuilder sb = new StringBuilder("["); |
| forEach(v -> sb.append(v).append(',').append(' ')); |
| if (sb.length() > 1) { |
| sb.setLength(sb.length() - 2); |
| } |
| sb.append(']'); |
| return sb.toString(); |
| } |
| } |