无法刷新jface表查看器

Question

I have built a table viewer, and i have set the following methods on it:

viewer.setContentProvider(new SampleContentProvider());
viewer.setLabelProvider(new SampleLabelProvider());
viewer.setInput(object);

SampleContentProvider implements IStructeredContentProvider

and

SampleLabelProvider implements ILabelProvider

I get the following exception when the viewer is refreshed after modify action on a table item:

org.eclipse.core.runtime.AssertionFailedException: null argument:

            at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)

            at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:73)

            at org.eclipse.jface.viewers.StructuredViewer.disassociate(StructuredViewer.java:640)

            at org.eclipse.jface.viewers.AbstractTableViewer.internalRefreshAll(AbstractTableViewer.java:727)

            at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:649)

            at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:636)

            at org.eclipse.jface.viewers.StructuredViewer$7.run(StructuredViewer.java:1487)

            at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1422)

            at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1383)

            at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1485)

            at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:537)

            at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1444)

I have debugged SampleContentProvider's getElements , it is returning an array of objects ...

I have no clue why this refresh call on the viewer occassionally causes this exception and therefore not updating the table with modified content.

Answer 1

The failure is caused by TableItem.getData() returning null which is not allowed.

When you use TableViewer to manage a table you must not manipulate the TableItem objects directly, TableViewer is in charge of these and changing them will lead to failures.

To sort a table use the TableViewer.setComparator call to supply a class based on ViewerComparator which sorts the objects in your data model.