Question

Is there a way to derive a pruned AbstractTableModel from a full AbstractTableModel without getValueAt() complications?

My full data (including userIds) is loaded into a JTable AbstractTableModel. However, for display purposes, I wish to derive a pruned AbstractTableModel of data associated with a particular userId.

I am beginning to think this is not possible because getValueAt intervenes and throws IndexOutOfBounds exceptions? These exceptions seem to occur becuase the pruned Data is not populated.

public class PrunedUserIdTableModel extends AbstractTableModel {

    TableModel fullModel;
    List columnIdentifiers;
    List tempDatum;
    List tempData; // holds tempDatums
    int rowCount; // reports pruned rowCount through getRowCount() method
    List prunedData; // intended to hold data of matched userId rows

    public PrunedUserIdTableModel(JTable fullTable, String userId) {
        fullModel = fullTable.getModel();
        columnIdentifiers = new ArrayList();
        tempDatum = new ArrayList();
        tempData = new ArrayList();
        rowCount = 0;

        List<Integer> userCount = new ArrayList<>(); 

        // Load columnIdentifiers from fullModel; omitted here

        // Go through fullModel searching for rows with matching userIds

        for (int i = 0; i < fullModel.getRowCount(); i++) {
            for (int k = 0; k < fullModel.getColumnCount(); k++) {
                tempDatum.add(fullModel.getValueAt(i,k);
                if ((fullModel.getValueAt(i,k).equals(userId)) {
                    // Matching userId found; record relevant row
                    userCount.add(g);
                }
            }
            tempData.add(tempDatum);
            tempDatum.clear();  
        }

        // Now populate prunedData
        for (int j = 0; j < userCount.size(); j++) {
            prunedData.add(tempData.get(userCount.get(j)));
            rowCount=rowCount+1;
        }

        fireTableChanged(null);
    }
    @Override
    public int getRowCount() {
        return rowCount;
    }  
    @Override
    public int getColumnCount() {
        return fullModel.getColumnCount();
    }
    @Override
    public int getValueAt(int rowIndex, int columnIndex) {
        // THROWS INDEX OUT OF BOUNDS EXCEPTION: Index 0; size 0
        List rowList = (List)prunedData.get(rowIndex);
        return rowList.get(columnIndex);
    }
}

Answer 1

Use a TableRowSorter to filter your JTable rows to show only the ones you want. Then, be sure to call convertRowIndexToView and convertRowIndexToModel when you are referencing something by its index.