Package io.deephaven.web.client.api.widget.plot

Class ChartData

java.lang.Object

io.deephaven.web.client.api.widget.plot.ChartData

@JsType(namespace="dh.plot")
public class ChartData
extends Object

Helper class to manage snapshots and deltas. Keeps a contiguous JS array of data per column in the underlying table, and supports a mapping function to let client code translate data in some way for display and caches the translated values.

Constructor Summary

Constructors

Constructor	Description
ChartData(JsTable table)

Method Summary

Modifier and Type	Method	Description
elemental2.core.JsArray<jsinterop.base.Any>	getColumn(String columnName, JsFunction<jsinterop.base.Any,jsinterop.base.Any> mappingFunc, TableData currentUpdate)	Returns the cached data for columnName.
void	removeColumn(String columnName, JsFunction<jsinterop.base.Any,jsinterop.base.Any> mappingFunc)	Removes a column from the cache, avoiding extra computation on incoming events, and possibly freeing some memory.
void	update(SubscriptionTableData tableData)	Updates cached column data to reflect a subscription update.

Methods inherited from class java.lang.Object

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

Constructor Details

ChartData

public ChartData(JsTable table)

Method Details

update

public void update(SubscriptionTableData tableData)

Updates cached column data to reflect a subscription update.

This applies row removals, insertions, and modifications to any cached column arrays so they remain aligned with the table's current row order.

Parameters:

tableData - the subscription update to apply

getColumn

public elemental2.core.JsArray<jsinterop.base.Any> getColumn(String columnName,
 JsFunction<jsinterop.base.Any,jsinterop.base.Any> mappingFunc,
 TableData currentUpdate)

Returns the cached data for columnName.

The cache key includes both columnName and mappingFunc. If no cached entry exists, the column data is computed from currentUpdate and stored for future calls.

If you want subsequent calls to re-use cached data, use the same mappingFunc instance each time.

Parameters:

columnName - the column name

mappingFunc - an optional mapping function applied to each value; null returns the raw column values

currentUpdate - the table snapshot used to populate the cache when the column is requested for the first time

Returns:

a contiguous JS array of values for this column

removeColumn

public void removeColumn(String columnName,
 JsFunction<jsinterop.base.Any,jsinterop.base.Any> mappingFunc)

Removes a column from the cache, avoiding extra computation on incoming events, and possibly freeing some memory. If this pair of column name and map function are requested again, it will be recomputed from scratch.