| /* |
| * 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.utils.CloseableUtils; |
| |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| import java.util.function.Supplier; |
| |
| public final class CompressedLongsReader implements ColumnarLongs |
| { |
| public static Supplier<CompressedLongsReader> fromByteBuffer(ByteBuffer buffer, ByteOrder order) |
| { |
| final Supplier<CompressedBlockReader> baseReader = CompressedBlockReader.fromByteBuffer(buffer, order); |
| return () -> new CompressedLongsReader(baseReader.get()); |
| } |
| |
| private final CompressedBlockReader blockReader; |
| private final ByteBuffer buffer; |
| |
| public CompressedLongsReader(CompressedBlockReader blockReader) |
| { |
| this.blockReader = blockReader; |
| this.buffer = blockReader.getDecompressedDataBuffer().asReadOnlyBuffer() |
| .order(blockReader.getDecompressedDataBuffer().order()); |
| } |
| |
| @Override |
| public long get(int index) |
| { |
| final long byteOffset = (long) index * Long.BYTES; |
| final int offset = blockReader.loadBlock(byteOffset); |
| return buffer.getLong(offset); |
| } |
| |
| @Override |
| public int size() |
| { |
| return (int) (blockReader.getSize() / Long.BYTES); |
| } |
| |
| @Override |
| public void close() |
| { |
| CloseableUtils.closeAndWrapExceptions(blockReader); |
| } |
| } |