org.apache.parquet.column.values.bitpacking

Class BitPackingValuesReader

java.lang.Object

org.apache.parquet.column.values.ValuesReader

org.apache.parquet.column.values.bitpacking.BitPackingValuesReader

public class BitPackingValuesReader
extends ValuesReader

a column reader that packs the ints in the number of bits required based on the maximum size.

Constructor Summary

Constructors

Constructor and Description
BitPackingValuesReader(int bound)

Method Summary

Modifier and Type	Method and Description
void	initFromPage(int valueCount, ByteBufferInputStream stream) Called to initialize the column reader from a part of a page.
int	readInteger()
void	skip() Skips the next value in the page

Methods inherited from class org.apache.parquet.column.values.ValuesReader

getNextOffset, initFromPage, initFromPage, readBoolean, readBytes, readDouble, readFloat, readLong, readValueDictionaryId, skip, updateNextOffset

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BitPackingValuesReader

public BitPackingValuesReader(int bound)

Parameters:

bound - the maximum value stored by this column

Method Detail

readInteger

public int readInteger()

Overrides:

readInteger in class ValuesReader

Returns:

the next integer from the page

See Also:

ValuesReader.readInteger()

initFromPage

public void initFromPage(int valueCount,
                         ByteBufferInputStream stream)
                  throws IOException

Called to initialize the column reader from a part of a page.

Implementations must consume all bytes from the input stream, leaving the stream ready to read the next section of data. The underlying implementation knows how much data to read, so a length is not provided.

Each page may contain several sections:

• repetition levels column
• definition levels column
• data column

Overrides:

initFromPage in class ValuesReader

Parameters:

valueCount - count of values in this page

stream - an input stream containing the page data at the correct offset

Throws:

IOException - if there is an exception while reading from the input stream

See Also:

ValuesReader.initFromPage(int, ByteBufferInputStream)

skip

public void skip()

Description copied from class: ValuesReader

Skips the next value in the page

Specified by:

skip in class ValuesReader