Package io.deephaven.parquet.table.pagestore.topage

Interface ToPage<ATTR extends Any,RESULT>

All Known Implementing Classes:

ToArrayPage, ToBigDecimalFromNumeric, ToBigDecimalPage, ToBigIntegerPage, ToBooleanAsBytePage, ToBytePage, ToCharPage, ToDoublePage, ToFloatPage, ToInstantPage, ToIntPage, ToLocalDatePage, ToLocalDateTimePage, ToLocalTimePage, ToLongPage, ToObjectPage, ToPage.Wrap, ToPageWithDictionary, ToShortPage, ToStringPage, ToStringSetPage, ToVectorPage

public interface ToPage<ATTR extends Any,RESULT>

This provides a translation layer from the parquet results into the appropriately typed Chunk's.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	ToPage.Wrap<ATTR extends Any,INNER_RESULT,OUTER_RESULT>

Method Summary

Modifier and Type	Method	Description
default RESULT	convertResult(Object result)
@NotNull ChunkType	getChunkType()
default Chunk<ATTR>	getDictionaryChunk()
default ToPage<DictionaryKeys,long[]>	getDictionaryKeysToPage()
default @NotNull Class<?>	getNativeComponentType()
@NotNull Class<?>	getNativeType()
PageMaterializerFactory	getPageMaterializerFactory()
default Object	getResult(ColumnPageReader columnPageReader, SeekableChannelContext channelContext)
default LongBitmapStringSet.ReversibleLookup	getReversibleLookup()
default Vector<?>	makeVector(RESULT result)
default Object	nullValue()
default @NotNull ChunkPage<ATTR>	toPage(long offset, ColumnPageReader columnPageReader, @NotNull SeekableChannelContext channelContext, long mask)	Produce the appropriately typed chunk page for the page read by the columnPageReader.

Method Details

getNativeType

@NotNull
@NotNull Class<?> getNativeType()

Returns:

The native type for the elements of the arrays produced by this object.

getNativeComponentType

@NotNull
default @NotNull Class<?> getNativeComponentType()

Returns:

The native type for the elements of engine arrays produced by this object.

getChunkType

@NotNull
@NotNull ChunkType getChunkType()

Returns:

The chunk type used to wrap the arrays produced by this object.

nullValue

default Object nullValue()

Returns:

The null value stored in the elements of the arrays produced by thus object.

getResult

default Object getResult(ColumnPageReader columnPageReader,
 SeekableChannelContext channelContext)
                  throws IOException

Returns:

Gets the result from the columnPageReader.

Throws:

IOException

convertResult

default RESULT convertResult(Object result)

Returns:

Produce the array of values from the result

makeVector

default Vector<?> makeVector(RESULT result)

Returns:

the method to create a Vector from RESULT.

toPage

@NotNull
@FinalDefault
default @NotNull ChunkPage<ATTR> toPage(long offset,
 ColumnPageReader columnPageReader,
 @NotNull
 @NotNull SeekableChannelContext channelContext,
 long mask)
                                 throws IOException

Produce the appropriately typed chunk page for the page read by the columnPageReader. This is the expected entry point for the ColumnChunkPageStore.

Throws:

IOException

getDictionaryChunk

default Chunk<ATTR> getDictionaryChunk()

Returns:

the dictionary stored for this column, if one exists, otherwise null.

getDictionaryKeysToPage

default ToPage<DictionaryKeys,long[]> getDictionaryKeysToPage()

Returns:

an object implementing ToPage which will read the integral Dictionary Indices when there's a dictionary for this column (as opposed to the values, which this object's toPage will return). This will return null iff getDictionaryChunk() returns null.

ApiNote:

null iff getDictionaryChunk() is null.

getReversibleLookup

default LongBitmapStringSet.ReversibleLookup getReversibleLookup()

Returns:

a reverse lookup map of the dictionary.

ApiNote:

null iff getDictionaryChunk() is null.

getPageMaterializerFactory

PageMaterializerFactory getPageMaterializerFactory()

Returns:

the factory to create the materializers for this column.