Java tutorial
/* * Licensed to Metamarkets Group Inc. (Metamarkets) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. Metamarkets 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 io.druid.segment.data; import com.google.common.primitives.Longs; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.LongBuffer; public class LongsLongEncodingReader implements CompressionFactory.LongEncodingReader { private LongBuffer buffer; public LongsLongEncodingReader(ByteBuffer fromBuffer, ByteOrder order) { this.buffer = fromBuffer.asReadOnlyBuffer().order(order).asLongBuffer(); } private LongsLongEncodingReader(LongBuffer buffer) { this.buffer = buffer; } @Override public void setBuffer(ByteBuffer buffer) { this.buffer = buffer.asLongBuffer(); } @Override public long read(int index) { return buffer.get(buffer.position() + index); } @Override public int getNumBytes(int values) { return values * Longs.BYTES; } @Override public CompressionFactory.LongEncodingReader duplicate() { return new LongsLongEncodingReader(buffer.duplicate()); } }