io.druid.segment.LongDimensionMergerV9 Maven / Gradle / Ivy
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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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package io.druid.segment;
import com.google.common.base.Throwables;
import io.druid.java.util.common.io.Closer;
import io.druid.segment.column.ColumnCapabilities;
import io.druid.segment.column.ColumnDescriptor;
import io.druid.segment.column.ValueType;
import io.druid.segment.data.CompressedObjectStrategy;
import io.druid.segment.data.CompressionFactory;
import io.druid.segment.data.IOPeon;
import io.druid.segment.serde.LongGenericColumnPartSerde;
import java.io.File;
import java.io.IOException;
import java.nio.IntBuffer;
import java.util.List;
public class LongDimensionMergerV9 implements DimensionMergerV9
{
protected String dimensionName;
protected ProgressIndicator progress;
protected final IndexSpec indexSpec;
protected ColumnCapabilities capabilities;
protected final File outDir;
protected IOPeon ioPeon;
protected LongColumnSerializer serializer;
public LongDimensionMergerV9(
String dimensionName,
IndexSpec indexSpec,
File outDir,
IOPeon ioPeon,
ColumnCapabilities capabilities,
ProgressIndicator progress
)
{
this.dimensionName = dimensionName;
this.indexSpec = indexSpec;
this.capabilities = capabilities;
this.outDir = outDir;
this.ioPeon = ioPeon;
this.progress = progress;
try {
setupEncodedValueWriter();
}
catch (IOException ioe) {
Throwables.propagate(ioe);
}
}
protected void setupEncodedValueWriter() throws IOException
{
final CompressedObjectStrategy.CompressionStrategy metCompression = indexSpec.getMetricCompression();
final CompressionFactory.LongEncodingStrategy longEncoding = indexSpec.getLongEncoding();
this.serializer = LongColumnSerializer.create(ioPeon, dimensionName, metCompression, longEncoding);
serializer.open();
}
@Override
public void writeMergedValueMetadata(List adapters) throws IOException
{
// longs have no additional metadata
}
@Override
public Long convertSegmentRowValuesToMergedRowValues(Long segmentRow, int segmentIndexNumber)
{
return segmentRow;
}
@Override
public void processMergedRow(Long rowValues) throws IOException
{
serializer.serialize(rowValues);
}
@Override
public void writeIndexes(List segmentRowNumConversions, Closer closer) throws IOException
{
// longs have no indices to write
}
@Override
public boolean canSkip()
{
// a long column can never be all null
return false;
}
@Override
public ColumnDescriptor makeColumnDescriptor() throws IOException
{
serializer.close();
final ColumnDescriptor.Builder builder = ColumnDescriptor.builder();
builder.setValueType(ValueType.LONG);
builder.addSerde(
LongGenericColumnPartSerde.serializerBuilder()
.withByteOrder(IndexIO.BYTE_ORDER)
.withDelegate(serializer)
.build()
);
return builder.build();
}
}