MultiValueSingletonDOMElementFactory.java

/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * 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.workbench.screens.guided.dtable.client.widget.table.columns.dom.listbox;

import com.google.gwt.user.client.ui.ListBox;
import org.drools.workbench.screens.guided.dtable.client.widget.table.GuidedDecisionTableView;
import org.uberfire.ext.wires.core.grids.client.model.GridCell;
import org.uberfire.ext.wires.core.grids.client.widget.dom.single.impl.BaseSingletonDOMElementFactory;
import org.uberfire.ext.wires.core.grids.client.widget.layer.GridLayer;
import org.uberfire.ext.wires.core.grids.client.widget.layer.impl.GridLienzoPanel;

/**
 * A DOMElement Factory for single-instance multi-value DOMElements.
 */
public abstract class MultiValueSingletonDOMElementFactory<T, W extends ListBox, E extends MultiValueDOMElement<T, W>> extends BaseSingletonDOMElementFactory<T, W, E> {

    public MultiValueSingletonDOMElementFactory( final GridLienzoPanel gridPanel,
                                                 final GridLayer gridLayer,
                                                 final GuidedDecisionTableView gridWidget ) {
        super( gridPanel,
               gridLayer,
               gridWidget );
    }

    public void toWidget( final GridCell<T> cell,
                          final W widget ) {
        if ( cell == null || cell.getValue() == null || cell.getValue().getValue() == null ) {
            if ( widget.getItemCount() > 0 ) {
                widget.setSelectedIndex( 0 );
            }

        } else {
            final T value = cell.getValue().getValue();
            final String convertedValue = convert( value );
            for ( int i = 0; i < widget.getItemCount(); i++ ) {
                if ( widget.getValue( i ).equals( convertedValue ) ) {
                    widget.setSelectedIndex( i );
                    break;
                }
            }
        }
    }

    public T fromWidget( final W widget ) {
        final StringBuilder sb = new StringBuilder();
        int selectedIndex = widget.getSelectedIndex();
        if ( selectedIndex >= 0 ) {
            sb.append( widget.getValue( selectedIndex ) );
        }
        return convert( sb.toString() );
    }

    /**
     * Convert from the given typed value to a String
     * @param value
     *         The value to be converted
     * @return A String representing the type
     */
    public abstract String convert( final T value );

    /**
     * Convert from the given String to a typed value
     * @param value
     *         The String to be converted
     * @return A typed value
     */
    public abstract T convert( final String value );

}