Package io.jmix.reports.yarg.formatters.impl.streaming

Class StreamingBandFeed

java.lang.Object

io.jmix.reports.yarg.formatters.impl.streaming.StreamingBandFeed

public class StreamingBandFeed
extends Object

One-shot supply of the streaming ("hot") band's rows for the streaming XLSX formatter. Each source row map is wrapped into a transient BandData parented by the root band but NEVER attached to it, so rendered rows become garbage as soon as the formatter moves on. When putEmptyRowIfNoDataSelected is on, an empty source yields exactly one empty row, mirroring the extractor's behavior.

Field Summary

Fields

Modifier and Type	Field	Description
protected final String	bandName
protected boolean	consumed
protected @Nullable BandData	firstRow	A detached plain-map copy of the first emitted row, retained (O(1) memory) for output file name resolution after the render.
protected final boolean	putEmptyRowIfNoDataSelected
protected final BandData	rootBand
protected final Iterator<Map<String,Object>>	rows

Constructor Summary

Constructors

Constructor	Description
StreamingBandFeed(String bandName, Iterator<Map<String,Object>> rows, BandData rootBand)
StreamingBandFeed(String bandName, Iterator<Map<String,Object>> rows, BandData rootBand, boolean putEmptyRowIfNoDataSelected)

Method Summary

Modifier and Type	Method	Description
String	getBandName()
@Nullable BandData	getFirstRow()	The first emitted row, or null when nothing was emitted or the feed was not consumed yet.
Iterator<BandData>	iterator()
protected BandData	wrap(Map<String,Object> row)

Methods inherited from class java.lang.Object

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

Field Details

bandName

protected final String bandName

rows

protected final Iterator<Map<String,Object>> rows

rootBand

protected final BandData rootBand

putEmptyRowIfNoDataSelected

protected final boolean putEmptyRowIfNoDataSelected

consumed

protected boolean consumed

firstRow

protected @Nullable BandData firstRow

A detached plain-map copy of the first emitted row, retained (O(1) memory) for output file name resolution after the render.

Constructor Details

StreamingBandFeed

public StreamingBandFeed(String bandName,
 Iterator<Map<String,Object>> rows,
 BandData rootBand)

StreamingBandFeed

public StreamingBandFeed(String bandName,
 Iterator<Map<String,Object>> rows,
 BandData rootBand,
 boolean putEmptyRowIfNoDataSelected)

Method Details

getBandName

public String getBandName()

iterator

public Iterator<BandData> iterator()

getFirstRow

public @Nullable BandData getFirstRow()

The first emitted row, or null when nothing was emitted or the feed was not consumed yet.

wrap

protected BandData wrap(Map<String,Object> row)