/**
* 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 java.io.ByteArrayInputStream;
import java.io.IOException;
import parquet.Log;
import parquet.bytes.LittleEndianDataInputStream;
import parquet.column.values.ValuesReader;
import parquet.io.ParquetDecodingException;
/**
* Plain encoding for float, double, int, long
*
* @author Julien Le Dem
*
*/
abstract public class PlainValuesReader extends ValuesReader {
private static final Log LOG = Log.getLog(PlainValuesReader.class);
protected LittleEndianDataInputStream in;
/**
* {@inheritDoc}
* @see parquet.column.values.ValuesReader#initFromPage(byte[], int)
*/
@Override
public void initFromPage(int valueCount, byte[] in, int offset) throws IOException {
if (DEBUG) LOG.debug("init from page at offset "+ offset + " for length " + (in.length - offset));
this.in = new LittleEndianDataInputStream(new ByteArrayInputStream(in, offset, in.length - offset));
}
public static class DoublePlainValuesReader extends PlainValuesReader {
@Override
public void skip() {
try {
in.skipBytes(8);
} catch (IOException e) {
throw new ParquetDecodingException("could not skip double", e);
}
}
@Override
public double readDouble() {
try {
return in.readDouble();
} catch (IOException e) {
throw new ParquetDecodingException("could not read double", e);
}
}
}
public static class FloatPlainValuesReader extends PlainValuesReader {
@Override
public void skip() {
try {
in.skipBytes(4);
} catch (IOException e) {
throw new ParquetDecodingException("could not skip float", e);
}
}
@Override
public float readFloat() {
try {
return in.readFloat();
} catch (IOException e) {
throw new ParquetDecodingException("could not read float", e);
}
}
}
public static class IntegerPlainValuesReader extends PlainValuesReader {
@Override
public void skip() {
try {
in.skipBytes(4);
} catch (IOException e) {
throw new ParquetDecodingException("could not skip int", e);
}
}
@Override
public int readInteger() {
try {
return in.readInt();
} catch (IOException e) {
throw new ParquetDecodingException("could not read int", e);
}
}
}
public static class LongPlainValuesReader extends PlainValuesReader {
@Override
public void skip() {
try {
in.skipBytes(8);
} catch (IOException e) {
throw new ParquetDecodingException("could not skip long", e);
}
}
@Override
public long readLong() {
try {
return in.readLong();
} catch (IOException e) {
throw new ParquetDecodingException("could not read long", e);
}
}
}
}