org.apache.parquet.column.values.plain

Class BooleanPlainValuesReader

java.lang.Object

org.apache.parquet.column.values.ValuesReader

org.apache.parquet.column.values.plain.BooleanPlainValuesReader

public class BooleanPlainValuesReader
extends ValuesReader

encodes boolean for the plain encoding: one bit at a time (0 = false)

Author:

Julien Le Dem

Constructor Summary

Constructors

Constructor and Description
BooleanPlainValuesReader()

Method Summary

Methods

Modifier and Type	Method and Description
int	getNextOffset() Called to return offset of the next section
void	initFromPage(int valueCount, ByteBuffer in, int offset) Called to initialize the column reader from a part of a page.
boolean	readBoolean()
void	skip() Skips the next value in the page

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

initFromPage, readBytes, readDouble, readFloat, readInteger, readLong, readValueDictionaryId

Methods inherited from class java.lang.Object

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

Constructor Detail

BooleanPlainValuesReader

public BooleanPlainValuesReader()

Method Detail

readBoolean

public boolean readBoolean()

Overrides:

readBoolean in class ValuesReader

Returns:

the next boolean from the page

See Also:

ValuesReader.readBoolean()

skip

public void skip()

Skips the next value in the page

Specified by:

skip in class ValuesReader

See Also:

ValuesReader.skip()

initFromPage

public void initFromPage(int valueCount,
                ByteBuffer in,
                int offset)
                  throws IOException

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

This function is called with 'offset' pointing to the beginning of one of these sections, and should return the offset to the section following it.

Specified by:

initFromPage in class ValuesReader

Parameters:

valueCount - count of values in this page

in - the array to read from containing the page data (repetition levels, definition levels, data)

offset - where to start reading from in the page

Throws:

IOException

See Also:

ValuesReader.initFromPage(int valueCount, ByteBuffer page, int offset)

getNextOffset

public int getNextOffset()

Description copied from class: ValuesReader

Called to return offset of the next section

Overrides:

getNextOffset in class ValuesReader

Returns:

offset of the next section