Package io.deephaven.engine.table.impl

Class FlattenOperation

java.lang.Object

io.deephaven.engine.table.impl.FlattenOperation

All Implemented Interfaces:

QueryTable.MemoizableOperation<QueryTable>, QueryTable.Operation<QueryTable>

public class FlattenOperation
extends Object
implements QueryTable.MemoizableOperation<QueryTable>

Nested Class Summary

Nested classes/interfaces inherited from interface io.deephaven.engine.table.impl.QueryTable.Operation

QueryTable.Operation.Result<T extends DynamicNode & NotificationStepReceiver>

Method Summary

Modifier and Type	Method	Description
static RowSetShiftData	computeFlattenedRowSetShiftData(@NotNull RowSet removed, @NotNull RowSet added, long prevSize)	Compute the shift data for a flattened row set given which rows were removed and which were added.
String	getDescription()
String	getLogPrefix()
MemoizedOperationKey	getMemoizedOperationKey()
QueryTable.Operation.Result<QueryTable>	initialize(boolean usePrev, long beforeClock)	Initialize this operation.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.deephaven.engine.table.impl.QueryTable.Operation

beginOperation, newSnapshotControl, snapshotNeeded

Method Details

getDescription

public String getDescription()

Specified by:

getDescription in interface QueryTable.Operation<QueryTable>

Returns:

the description of this operation

getLogPrefix

public String getLogPrefix()

Specified by:

getLogPrefix in interface QueryTable.Operation<QueryTable>

Returns:

the log prefix of this operation

getMemoizedOperationKey

public MemoizedOperationKey getMemoizedOperationKey()

Specified by:

getMemoizedOperationKey in interface QueryTable.MemoizableOperation<QueryTable>

Returns:

the key that should be used to memoize off of

initialize

public QueryTable.Operation.Result<QueryTable> initialize(boolean usePrev,
 long beforeClock)

Description copied from interface: QueryTable.Operation

Initialize this operation.

Specified by:

initialize in interface QueryTable.Operation<QueryTable>

Parameters:

usePrev - data from the previous cycle should be used (otherwise use this cycle)

beforeClock - the clock value that we captured before the function began; the function can use this value to bail out early if it notices something has gone wrong.

Returns:

the result table / listener if successful, null if it should be retried.

computeFlattenedRowSetShiftData

public static RowSetShiftData computeFlattenedRowSetShiftData(@NotNull
 @NotNull RowSet removed,
 @NotNull
 @NotNull RowSet added,
 long prevSize)

Compute the shift data for a flattened row set given which rows were removed and which were added.

Parameters:

removed - the rows that were removed in the flattened pre-update key-space

added - the rows that were added in the flattened post-update key-space

prevSize - the size of the table before the update

Returns:

the shift data