io.druid.segment.data.LongsLongEncodingWriter.java Source code

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Here is the source code for io.druid.segment.data.LongsLongEncodingWriter.java

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/*
 * 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.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

public class LongsLongEncodingWriter implements CompressionFactory.LongEncodingWriter {

    private final ByteBuffer orderBuffer;
    private final ByteOrder order;
    private ByteBuffer outBuffer = null;
    private OutputStream outStream = null;

    public LongsLongEncodingWriter(ByteOrder order) {
        this.order = order;
        orderBuffer = ByteBuffer.allocate(Longs.BYTES);
        orderBuffer.order(order);
    }

    @Override
    public void setBuffer(ByteBuffer buffer) {
        outStream = null;
        outBuffer = buffer;
        // this order change is safe as the buffer is passed in and allocated in BlockLayoutLongSupplierSerializer, and
        // is used only as a temporary storage to be written
        outBuffer.order(order);
    }

    @Override
    public void setOutputStream(OutputStream output) {
        outBuffer = null;
        outStream = output;
    }

    @Override
    public void write(long value) throws IOException {
        if (outBuffer != null) {
            outBuffer.putLong(value);
        }
        if (outStream != null) {
            orderBuffer.rewind();
            orderBuffer.putLong(value);
            outStream.write(orderBuffer.array());
        }
    }

    @Override
    public void flush() throws IOException {
    }

    @Override
    public void putMeta(OutputStream metaOut, CompressedObjectStrategy.CompressionStrategy strategy)
            throws IOException {
        metaOut.write(strategy.getId());
    }

    @Override
    public int getBlockSize(int bytesPerBlock) {
        return bytesPerBlock / Longs.BYTES;
    }

    @Override
    public int getNumBytes(int values) {
        return values * Longs.BYTES;
    }
}