Package io.deephaven.engine.table.impl.dataindex

Class AbstractDataIndex

java.lang.Object

io.deephaven.util.referencecounting.ReferenceCounted

io.deephaven.engine.liveness.ReferenceCountedLivenessReferent

io.deephaven.engine.liveness.ReferenceCountedLivenessNode

io.deephaven.engine.liveness.LivenessArtifact

io.deephaven.engine.table.impl.dataindex.AbstractDataIndex

All Implemented Interfaces:

LogOutputAppendable, LivenessManager, LivenessNode, LivenessReferent, BasicDataIndex, DataIndex, Serializable

Direct Known Subclasses:

RemappedDataIndex, TableBackedDataIndex

public abstract class AbstractDataIndex
extends LivenessArtifact
implements DataIndex

Abstract base implementation of DataIndex that provides common functionality.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface io.deephaven.engine.table.DataIndex

DataIndex.RowKeyLookup

Field Summary

Fields

Modifier and Type	Field	Description
protected static final String	ROW_SET_COLUMN_NAME	The name of the RowSet column in the index BasicDataIndex.table() used by all AbstractDataIndex instances.

Constructor Summary

Constructors

Constructor	Description
AbstractDataIndex()

Method Summary

Modifier and Type	Method	Description
protected static QueryTable	indexTableWrapper(@NotNull QueryTable parent, @NotNull String rowSetColumn)	Return a copy of parent with the RowSet column replaced with a wrapper column that adds prev calls on access to previous values.
protected static QueryTable	indexTableWrapper(@NotNull QueryTable parent, @NotNull String rowSetColumn, @NotNull String renamedRowSetColumn)	Return a copy of parent with the RowSet column replaced with a wrapper column that adds prev calls on access to previous values.
abstract boolean	isValid()	Whether this AbstractDataIndex is potentially usable.
final @NotNull DataIndex	remapKeyColumns(@NotNull Map<ColumnSource<?>,ColumnSource<?>> oldToNewColumnMap)	Create a new DataIndex using the same index BasicDataIndex.table(), with the indexed columns in BasicDataIndex.keyColumnNamesByIndexedColumn() remapped according to oldToNewColumnMap.
final @NotNull String	rowSetColumnName()	Get the RowSet column name for the index table.
final @NotNull BasicDataIndex	transform(@NotNull DataIndexTransformer transformer)	Transform and return a new BasicDataIndex with the provided transform operations applied.

Methods inherited from class io.deephaven.engine.liveness.LivenessArtifact

manageWithCurrentScope

Methods inherited from class io.deephaven.engine.liveness.ReferenceCountedLivenessNode

getWeakReference, initializeTransientFieldsForLiveness, onReferenceCountAtZero, tryManage, tryUnmanage, tryUnmanage

Methods inherited from class io.deephaven.engine.liveness.ReferenceCountedLivenessReferent

destroy, dropReference, tryRetainReference

Methods inherited from class io.deephaven.util.referencecounting.ReferenceCounted

append, decrementReferenceCount, forceReferenceCountToZero, getReferenceCountDebug, incrementReferenceCount, resetReferenceCount, toString, tryDecrementReferenceCount, tryIncrementReferenceCount

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.deephaven.engine.table.BasicDataIndex

isRefreshing, keyColumnNames, keyColumnNamesByIndexedColumn, keyColumns, keyColumns, rowSetColumn, rowSetColumn, table, table, tableIsCached

Methods inherited from interface io.deephaven.engine.table.DataIndex

rowKeyLookup, rowKeyLookup, rowKeyLookup

Methods inherited from interface io.deephaven.engine.liveness.LivenessManager

manage, unmanage, unmanage

Methods inherited from interface io.deephaven.engine.liveness.LivenessReferent

dropReference, getReferentDescription, getWeakReference, retainReference, tryRetainReference

Field Details

ROW_SET_COLUMN_NAME

protected static final String ROW_SET_COLUMN_NAME

The name of the RowSet column in the index BasicDataIndex.table() used by all AbstractDataIndex instances.

See Also:

• Constant Field Values

Constructor Details

AbstractDataIndex

public AbstractDataIndex()

Method Details

rowSetColumnName

@NotNull
public final @NotNull String rowSetColumnName()

Description copied from interface: BasicDataIndex

Get the RowSet column name for the index table.

Specified by:

rowSetColumnName in interface BasicDataIndex

Returns:

The RowSet column name

transform

@NotNull
public final @NotNull BasicDataIndex transform(@NotNull
 @NotNull DataIndexTransformer transformer)

Description copied from interface: DataIndex

Transform and return a new BasicDataIndex with the provided transform operations applied. Some transformations will force the result to be a static snapshot even when this DataIndex is refreshing.

Specified by:

transform in interface DataIndex

Parameters:

transformer - The DataIndexTransformer specifying the desired transformations

Returns:

The transformed BasicDataIndex

remapKeyColumns

@NotNull
public final @NotNull DataIndex remapKeyColumns(@NotNull
 @NotNull Map<ColumnSource<?>,ColumnSource<?>> oldToNewColumnMap)

Description copied from interface: DataIndex

Create a new DataIndex using the same index BasicDataIndex.table(), with the indexed columns in BasicDataIndex.keyColumnNamesByIndexedColumn() remapped according to oldToNewColumnMap. This is used when it is known that an operation has produced new columns that are equivalent to the old indexed columns. The result index may keep this index reachable and live for its own lifetime, if necessary.

Specified by:

remapKeyColumns in interface DataIndex

Parameters:

oldToNewColumnMap - Map from the old indexed ColumnSources to the new indexed ColumnSources

Returns:

The remapped DataIndex

isValid

public abstract boolean isValid()

Whether this AbstractDataIndex is potentially usable. This will return true when there are no known issues for this data index. This performs fast checks, such as verifying all locations have index table files, but does not fully guarantee that the index is complete and loadable.

Returns:

true If the AbstractDataIndex is potentially usable, false otherwise

indexTableWrapper

protected static QueryTable indexTableWrapper(@NotNull
 @NotNull QueryTable parent,
 @NotNull
 @NotNull String rowSetColumn)

Return a copy of parent with the RowSet column replaced with a wrapper column that adds prev calls on access to previous values.

Parameters:

parent - The Table to copy

rowSetColumn - The name of the RowSet column to wrap

Returns:

The copied Table

indexTableWrapper

protected static QueryTable indexTableWrapper(@NotNull
 @NotNull QueryTable parent,
 @NotNull
 @NotNull String rowSetColumn,
 @NotNull
 @NotNull String renamedRowSetColumn)

Return a copy of parent with the RowSet column replaced with a wrapper column that adds prev calls on access to previous values.

Parameters:

parent - The Table to copy

rowSetColumn - The name of the RowSet column to wrap

renamedRowSetColumn - The name of the RowSet column in the output Table

Returns:

The copied Table