parquet.column.values.plain.BooleanPlainValuesReader Maven / Gradle / Ivy
/**
* 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.plain;
import static parquet.Log.DEBUG;
import static parquet.column.values.bitpacking.Packer.LITTLE_ENDIAN;
import java.io.IOException;
import parquet.Log;
import parquet.column.values.ValuesReader;
import parquet.column.values.bitpacking.ByteBitPackingValuesReader;
/**
* encodes boolean for the plain encoding: one bit at a time (0 = false)
*
* @author Julien Le Dem
*
*/
public class BooleanPlainValuesReader extends ValuesReader {
private static final Log LOG = Log.getLog(BooleanPlainValuesReader.class);
private ByteBitPackingValuesReader in = new ByteBitPackingValuesReader(1, LITTLE_ENDIAN);
/**
*
* {@inheritDoc}
* @see parquet.column.values.ValuesReader#readBoolean()
*/
@Override
public boolean readBoolean() {
return in.readInteger() == 0 ? false : true;
}
/**
* {@inheritDoc}
* @see parquet.column.values.ValuesReader#skipBoolean()
*/
@Override
public void skip() {
in.readInteger();
}
/**
* {@inheritDoc}
* @see parquet.column.values.ValuesReader#initFromPage(byte[], int)
*/
@Override
public int initFromPage(long valueCount, byte[] in, int offset) throws IOException {
if (DEBUG) LOG.debug("init from page at offset "+ offset + " for length " + (in.length - offset));
return this.in.initFromPage(valueCount, in, offset);
}
}