org.apache.hupa.widgets.ui.RefetchPagingScrollTable.java Source code

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Here is the source code for org.apache.hupa.widgets.ui.RefetchPagingScrollTable.java

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 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
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package org.apache.hupa.widgets.ui;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;

import com.google.gwt.gen2.table.client.FixedWidthFlexTable;
import com.google.gwt.gen2.table.client.FixedWidthGrid;
import com.google.gwt.gen2.table.client.MutableTableModel;
import com.google.gwt.gen2.table.client.PagingScrollTable;
import com.google.gwt.gen2.table.client.TableDefinition;
import com.google.gwt.gen2.table.client.TableModel.Callback;
import com.google.gwt.gen2.table.client.TableModelHelper.Request;
import com.google.gwt.gen2.table.client.TableModelHelper.Response;
import com.google.gwt.gen2.table.event.client.RowSelectionEvent;
import com.google.gwt.gen2.table.event.client.RowSelectionHandler;
import com.google.gwt.gen2.table.event.client.TableEvent.Row;

/**
 * PagingScrollTable which refetch a row after one is deleted. This ensure that always the configured page
 * size is shown. 
 * 
 * 
 *
 */
public class RefetchPagingScrollTable<RowType> extends PagingScrollTable<RowType> {
    private ArrayList<RowType> selectedRows = new ArrayList<RowType>();

    public RefetchPagingScrollTable(MutableTableModel<RowType> tableModel, FixedWidthGrid dataTable,
            FixedWidthFlexTable headerTable, TableDefinition<RowType> tableDefinition) {
        super(tableModel, dataTable, headerTable, tableDefinition);

        getDataTable().addRowSelectionHandler(new RowSelectionHandler() {

            public void onRowSelection(RowSelectionEvent event) {
                Iterator<Row> rowIndexIt = event.getSelectedRows().iterator();
                while (rowIndexIt.hasNext()) {
                    RowType row = getRowValue(rowIndexIt.next().getRowIndex());
                    if (selectedRows.contains(row) == false) {
                        selectedRows.add(row);
                    }
                }

                Iterator<Row> rowDeselectIndexIt = event.getDeselectedRows().iterator();
                while (rowDeselectIndexIt.hasNext()) {
                    RowType row = getRowValue(rowDeselectIndexIt.next().getRowIndex());
                    selectedRows.remove(row);
                }
            }

        });
    }

    /**
     * Get selected rows
     * 
     * @return rows
     */
    public ArrayList<RowType> getSelectedRows() {
        return selectedRows;
    }

    /**
     * Remove the given rows from the underlying dataTable 
     * 
     * @param rows
     */
    public void removeRows(ArrayList<RowType> rows) {
        ArrayList<Integer> rowsIndex = new ArrayList<Integer>();
        for (RowType rowType : rows) {
            int rowIndex = getRowValues().indexOf(rowType);
            if (rowsIndex.contains(rowIndex) == false) {
                rowsIndex.add(rowIndex);
            }
        }
        // Check if we found any rows to remove
        if (rowsIndex.isEmpty() == false) {
            // remove the row value on deletion
            for (int i = 0; i < rowsIndex.size(); i++) {
                int index = rowsIndex.get(i) - i;
                selectedRows.remove(getRowValue(index));
                getRowValues().remove(index);

                ((MutableTableModel<RowType>) getTableModel()).removeRow(index);
            }

            // Check if we need to refetch rows
            if (getTableModel().getRowCount() >= getPageSize()) {
                // request new rows to fill the table again
                Request r = new Request(getAbsoluteLastRowIndex() + 1, rowsIndex.size());
                getTableModel().requestRows(r, new Callback<RowType>() {

                    public void onFailure(Throwable caught) {
                        // Nothing todo
                    }

                    public void onRowsReady(Request request, Response<RowType> response) {
                        // Add the new row values
                        Iterator<RowType> it = response.getRowValues();
                        while (it.hasNext()) {
                            getRowValues().add(it.next());
                        }
                        // copy the selected rows to reset it after reloading the data
                        Iterator<Integer> selected = new HashSet<Integer>(getDataTable().getSelectedRows())
                                .iterator();

                        // set the data
                        setData(getAbsoluteFirstRowIndex(), getRowValues().iterator());

                        // select the rows again
                        while (selected.hasNext()) {
                            getDataTable().selectRow(selected.next(), false);
                        }
                    }

                });
            } else {
                // redraw the table to eliminate empty rows
                redraw();
            }
        }
    }
}