/**
* Copyright 2012 Twitter, Inc.
*
* Licensed 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 parquet.column.values.rle;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import parquet.Ints;
import parquet.bytes.BytesInput;
import parquet.bytes.BytesUtils;
import parquet.column.Encoding;
import parquet.column.values.ValuesWriter;
import parquet.io.ParquetEncodingException;
/**
* @author Alex Levenson
*/
public class RunLengthBitPackingHybridValuesWriter extends ValuesWriter {
private final RunLengthBitPackingHybridEncoder encoder;
private final ByteArrayOutputStream length;
public RunLengthBitPackingHybridValuesWriter(int bitWidth, int initialCapacity) {
this.encoder = new RunLengthBitPackingHybridEncoder(bitWidth, initialCapacity);
this.length = new ByteArrayOutputStream(4);
}
@Override
public void writeInteger(int v) {
try {
encoder.writeInt(v);
} catch (IOException e) {
throw new ParquetEncodingException(e);
}
}
@Override
public void writeBoolean(boolean v) {
writeInteger(v ? 1 : 0);
}
@Override
public long getBufferedSize() {
return encoder.getBufferedSize();
}
@Override
public long getAllocatedSize() {
return encoder.getAllocatedSize();
}
@Override
public BytesInput getBytes() {
try {
// prepend the length of the column
BytesInput rle = encoder.toBytes();
BytesUtils.writeIntLittleEndian(length, Ints.checkedCast(rle.size()));
return BytesInput.concat(BytesInput.from(length.toByteArray()), rle);
} catch (IOException e) {
throw new ParquetEncodingException(e);
}
}
@Override
public Encoding getEncoding() {
return Encoding.RLE;
}
@Override
public void reset() {
encoder.reset();
length.reset();
}
@Override
public String memUsageString(String prefix) {
return String.format("%s RunLengthBitPackingHybrid %d bytes", prefix, getAllocatedSize());
}
}