/*
 * Copyright 2010 JBoss Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.guvnor.client.widgets.tables;

import com.google.gwt.cell.client.CheckboxCell;
import com.google.gwt.cell.client.FieldUpdater;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;
import com.google.gwt.user.cellview.client.CellTable;
import com.google.gwt.user.cellview.client.Column;

public class SelectionColumn<T> extends Column<T, Boolean> {

    public static <T> void createAndAddSelectionColumn(CellTable<T> cellTable) {
        SelectionColumn<T> selectionColumn = new SelectionColumn<T>(cellTable);
        cellTable.addColumn(selectionColumn, SafeHtmlUtils.fromSafeConstant("<br>"));
    }

    private final CellTable<T> cellTable;

    public SelectionColumn(CellTable<T> cellTable) {
        super(new CheckboxCell(true));
        this.cellTable = cellTable;
        addUpdater();
    }

    private void addUpdater() {
        setFieldUpdater(new FieldUpdater<T, Boolean>() {
            public void update(int index, T object, Boolean value) {
                cellTable.getSelectionModel().setSelected(object, value);
            }
        });
    }

    public Boolean getValue(T object) {
        return cellTable.getSelectionModel().isSelected(object);
    }

}
