Package io.deephaven.engine.util

Class WindowCheck

java.lang.Object

io.deephaven.engine.util.WindowCheck

public class WindowCheck
extends Object

Adds a Boolean column that is true if a Timestamp is within the specified window.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	WindowCheck.TimeWindowListener	This interface is only for Deephaven internal use.

Method Summary

Modifier and Type	Method	Description
static Table	addTimeWindow(QueryTable table, String timestampColumn, long windowNanos, String inWindowColumn)	Adds a Boolean column that is false when a timestamp column is older than windowNanos.
static Pair<Table,WindowCheck.TimeWindowListener>	addTimeWindowInternal(Clock clock, QueryTable table, String timestampColumn, long windowNanos, String inWindowColumn, boolean addToMonitor)	See addTimeWindow(QueryTable, String, long, String) for a description, the internal version gives you access to the TimeWindowListener for unit testing purposes.

Methods inherited from class java.lang.Object

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

Method Details

addTimeWindow

public static Table addTimeWindow(QueryTable table,
 String timestampColumn,
 long windowNanos,
 String inWindowColumn)

Adds a Boolean column that is false when a timestamp column is older than windowNanos.

If the timestamp is greater than or equal to the curent time - windowNanos, then the result column is true. If the timestamp is null; the InWindow value is null.

The resultant table ticks whenever the input table ticks, or modifies a row when it passes out of the window.

The timestamp column must be an Instant or a long value expressed as nanoseconds since the epoch.

Parameters:

table - the input table

timestampColumn - the timestamp column to monitor in table

windowNanos - how many nanoseconds in the past a timestamp can be before it is out of the window

inWindowColumn - the name of the new Boolean column.

Returns:

a new table that contains an in-window Boolean column

addTimeWindowInternal

@InternalUseOnly
public static Pair<Table,WindowCheck.TimeWindowListener> addTimeWindowInternal(Clock clock,
 QueryTable table,
 String timestampColumn,
 long windowNanos,
 String inWindowColumn,
 boolean addToMonitor)

See addTimeWindow(QueryTable, String, long, String) for a description, the internal version gives you access to the TimeWindowListener for unit testing purposes.

Parameters:

addToMonitor - should we add this to the PeriodicUpdateGraph

Returns:

a pair of the result table and the TimeWindowListener that drives it