/*
 * Copyright 2008 Google 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 com.google.gwt.gen2.table.client;

import com.google.gwt.gen2.table.client.TableDefinition.*;
import com.google.gwt.user.client.ui.*;

/**
 * The default {@link CellRenderer} used by the {@link AbstractColumnDefinition}
 * when the user does not specify one. By default, {@link Widget}s are rendered
 * as {@link Widget}s, and all other values are rendered as text.
 *
 * @param <RowType> the type of the row value
 * @param <ColType> the data type of the column
 */
public class DefaultCellRenderer<RowType, ColType> implements CellRenderer<RowType, ColType> {

    /**
     * If true, text will be rendered as html.
     */
    private boolean asHtml;

    /**
     * Construct a new {@link DefaultCellRenderer}.
     */
    public DefaultCellRenderer() {
    }

    /**
     * Construct a new {@link DefaultCellRenderer}.
     *
     * @param asHtml if true, non-widget cell contents will be rendered as html
     */
    public DefaultCellRenderer( boolean asHtml ) {
        this.asHtml = asHtml;
    }

    public void renderRowValue( RowType rowValue, ColumnDefinition<RowType, ColType> columnDef, AbstractCellView<RowType> view ) {
        Object cellValue = columnDef.getCellValue( rowValue );
        if ( cellValue == null ) {
            view.setText( "" );
        } else if ( cellValue instanceof Widget ) {
            view.setWidget( (Widget) cellValue );
        } else if ( asHtml ) {
            view.setHTML( cellValue.toString() );
        } else {
            view.setText( cellValue.toString() );
        }
    }
}