| Issue with RowSelectionProvider [message #1185216] |
Wed, 13 November 2013 19:11  |
Eclipse User |
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Hi,
I am using Nattable in an eclipse plugin. The grid is virtual and the data is provided from a file and the data is provided on demand using the IRowDataProvider<T> and it works well and the grid is really fast even for providing huge data from 1 or 2 GB file. I am using the RowSelectionProvider to listen for selected row(or cell in a row) and perform some actions.
RowSelectionProvider<MyObj> selectionProvider = new RowSelectionProvider<MyObj>( selectionLayer, layer.getBodyProvider(), false );
selectionProvider.addSelectionChangedListener( this );
This also works well and it provides the selected row object in the selection event. But the grid consumes too much memory when selecting a column header and eventually crashes with out of memory exception. The reason seems to be that the selection provider is trying to get the objects for all selected rows which is the entire table( the range shown in populateRowSelection method of RowSelectionProvider is Range[0,16544946] ). I am not sure if someone has faced a scenario like this with RowSelectionProvider
Here is the methods that store all the data in memory which defeats the virtual nature of the grid
@SuppressWarnings("rawtypes")
static StructuredSelection populateRowSelection(SelectionLayer selectionLayer, IRowDataProvider rowDataProvider, boolean fullySelectedRowsOnly) {
List<RowObjectIndexHolder<Object>> rows = new ArrayList<RowObjectIndexHolder<Object>>();
if (selectionLayer != null) {
if (fullySelectedRowsOnly) {
for (int rowPosition : selectionLayer.getFullySelectedRowPositions()) {
addToSelection(rows, rowPosition, selectionLayer, rowDataProvider);
}
} else {
Set<Range> rowRanges = selectionLayer.getSelectedRowPositions();
for (Range rowRange : rowRanges) {
for (int rowPosition = rowRange.start; rowPosition < rowRange.end; rowPosition++) {
addToSelection(rows, rowPosition, selectionLayer, rowDataProvider);
}
}
}
}
Collections.sort(rows);
List<Object> rowObjects = new ArrayList<Object>();
for(RowObjectIndexHolder<Object> holder : rows){
rowObjects.add(holder.getRow());
}
return rows.isEmpty() ? StructuredSelection.EMPTY : new StructuredSelection(rowObjects);
}
@SuppressWarnings("rawtypes")
private static void addToSelection(List<RowObjectIndexHolder<Object>> rows, int rowPosition, SelectionLayer selectionLayer, IRowDataProvider rowDataProvider) {
int rowIndex = selectionLayer.getRowIndexByPosition(rowPosition);
if (rowIndex >= 0 && rowIndex < rowDataProvider.getRowCount()) {
Object rowObject = rowDataProvider.getRowObject(rowIndex);
rows.add(new RowObjectIndexHolder<Object>(rowIndex, rowObject));
}
}
It crashed with the following error
java.lang.OutOfMemoryError: Java heap space
.....
......
at org.eclipse.nebula.widgets.nattable.selection.RowSelectionProvider.addToSelection(RowSelectionProvider.java:211)
at org.eclipse.nebula.widgets.nattable.selection.RowSelectionProvider.populateRowSelection(RowSelectionProvider.java:194)
at org.eclipse.nebula.widgets.nattable.selection.RowSelectionProvider.getSelection(RowSelectionProvider.java:130)
at org.eclipse.nebula.widgets.nattable.selection.RowSelectionProvider.handleLayerEvent(RowSelectionProvider.java:168)
at org.eclipse.nebula.widgets.nattable.layer.AbstractLayer.fireLayerEvent(AbstractLayer.java:242)
at org.eclipse.nebula.widgets.nattable.selection.SelectColumnCommandHandler.selectColumn(SelectColumnCommandHandler.java:59)
at org.eclipse.nebula.widgets.nattable.selection.SelectColumnCommandHandler.doCommand(SelectColumnCommandHandler.java:35)
at org.eclipse.nebula.widgets.nattable.selection.SelectColumnCommandHandler.doCommand(SelectColumnCommandHandler.java:1)
at org.eclipse.nebula.widgets.nattable.layer.AbstractLayer.doCommand(AbstractLayer.java:154)
at org.eclipse.nebula.widgets.nattable.layer.AbstractIndexLayerTransform.doCommand(AbstractIndexLayerTransform.java:109)
at org.eclipse.nebula.widgets.nattable.selection.SelectionLayer.doCommand(SelectionLayer.java:395)
at org.eclipse.nebula.widgets.nattable.layer.AbstractLayerTransform.doCommand(AbstractLayerTransform.java:107)
at org.eclipse.nebula.widgets.nattable.viewport.ViewportLayer.doCommand(ViewportLayer.java:683)
at org.eclipse.nebula.widgets.nattable.viewport.command.ViewportSelectColumnCommandHandler.doCommand(ViewportSelectColumnCommandHandler.java:33)
at org.eclipse.nebula.widgets.nattable.viewport.command.ViewportSelectColumnCommandHandler.doCommand(ViewportSelectColumnCommandHandler.java:1)
at org.eclipse.nebula.widgets.nattable.command.AbstractLayerCommandHandler.doCommand(AbstractLayerCommandHandler.java:19)
at org.eclipse.nebula.widgets.nattable.layer.AbstractLayer.doCommand(AbstractLayer.java:154)
at org.eclipse.nebula.widgets.nattable.layer.AbstractLayerTransform.doCommand(AbstractLayerTransform.java:102)
at org.eclipse.nebula.widgets.nattable.viewport.ViewportLayer.doCommand(ViewportLayer.java:683)
at org.eclipse.nebula.widgets.nattable.grid.layer.GridLayer.doCommandOnChildLayer(GridLayer.java:109)
at org.eclipse.nebula.widgets.nattable.grid.layer.GridLayer.doCommandOnChildLayers(GridLayer.java:96)
at org.eclipse.nebula.widgets.nattable.layer.CompositeLayer.doCommand(CompositeLayer.java:137)
at org.eclipse.nebula.widgets.nattable.grid.layer.GridLayer.doCommand(GridLayer.java:178)
at org.eclipse.nebula.widgets.nattable.NatTable.doCommand(NatTable.java:516)
at org.eclipse.nebula.widgets.nattable.viewport.action.ViewportSelectColumnAction.run(ViewportSelectColumnAction.java:33)
at org.eclipse.nebula.widgets.nattable.ui.mode.MouseModeEventHandler.executeSingleClickAction(MouseModeEventHandler.java:117)
Is there a way to not listen for rowselection events when an entire column is selected? As the rowselectionprovider works correctly for single cell/row selections.
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