org.metawidget.vaadin.ui.widgetbuilder.VaadinWidgetBuilder Maven / Gradle / Ivy
// Metawidget (licensed under LGPL)
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package org.metawidget.vaadin.ui.widgetbuilder;
import static org.metawidget.inspector.InspectionResultConstants.*;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import java.util.Map;
import org.metawidget.util.ClassUtils;
import org.metawidget.util.CollectionUtils;
import org.metawidget.util.WidgetBuilderUtils;
import org.metawidget.vaadin.ui.Stub;
import org.metawidget.vaadin.ui.VaadinMetawidget;
import org.metawidget.vaadin.ui.widgetprocessor.binding.BindingConverter;
import org.metawidget.widgetbuilder.iface.WidgetBuilder;
import org.metawidget.widgetbuilder.iface.WidgetBuilderException;
import com.vaadin.ui.Button;
import com.vaadin.ui.CheckBox;
import com.vaadin.ui.Component;
import com.vaadin.ui.PasswordField;
import com.vaadin.ui.PopupDateField;
import com.vaadin.ui.Select;
import com.vaadin.ui.Slider;
import com.vaadin.ui.Slider.ValueOutOfBoundsException;
import com.vaadin.ui.TextArea;
import com.vaadin.ui.TextField;
/**
* WidgetBuilder for Vaadin environments.
*
* Creates native Vaadin Components, such as TextField and
* Select or CheckBox, to suit the inspected fields.
*
* @author Loghman Barari
*/
public class VaadinWidgetBuilder
implements WidgetBuilder {
//
// Public methods
//
public Component buildWidget( String elementName, Map attributes, VaadinMetawidget metawidget ) {
// Hidden
if ( TRUE.equals( attributes.get( HIDDEN ) ) ) {
return new Stub();
}
// Action
if ( ACTION.equals( elementName ) ) {
return new Button();
}
// Lookup the Class
Class clazz = WidgetBuilderUtils.getActualClassOrType( attributes, String.class );
// Support mandatory Booleans (can be rendered as a checkbox, even
// though they have a Lookup)
if ( Boolean.class.equals( clazz ) && TRUE.equals( attributes.get( REQUIRED ) ) ) {
return new CheckBox();
}
// Lookups
String lookup = attributes.get( LOOKUP );
if ( lookup != null && !"".equals( lookup ) ) {
return createSelectComponent( attributes, lookup, metawidget );
}
if ( clazz != null ) {
// Primitives
if ( clazz.isPrimitive() ) {
// booleans
if ( boolean.class.equals( clazz ) ) {
return new CheckBox();
}
// chars
if ( char.class.equals( clazz ) ) {
TextField textField = new TextField();
textField.setMaxLength( 1 );
return textField;
}
// Ranged
String minimumValue = attributes.get( MINIMUM_VALUE );
String maximumValue = attributes.get( MAXIMUM_VALUE );
if ( minimumValue != null && !"".equals( minimumValue ) && maximumValue != null && !"".equals( maximumValue ) ) {
Slider slider = new Slider();
slider.setMin( Double.parseDouble( minimumValue ) );
try {
slider.setValue( slider.getMin() );
} catch ( ValueOutOfBoundsException e ) {
throw WidgetBuilderException.newException( e );
}
slider.setMax( Double.parseDouble( maximumValue ) );
return slider;
}
// Not-ranged
return createTextField( attributes );
}
// Strings
if ( String.class.equals( clazz ) ) {
if ( TRUE.equals( attributes.get( MASKED ) ) ) {
return new PasswordField();
}
if ( TRUE.equals( attributes.get( LARGE ) ) ) {
return new TextArea();
}
return createTextField( attributes );
}
// Characters
if ( Character.class.isAssignableFrom( clazz ) ) {
TextField textField = new TextField();
textField.setMaxLength( 1 );
return textField;
}
// Dates
if ( Date.class.equals( clazz ) ) {
return new PopupDateField();
}
// Numbers
//
// Note: we use a text field, not a JSpinner or JSlider, because
// BeansBinding gets upset at doing 'setValue( null )' if the Integer
// is null. We can still use JSpinner/JSliders for primitives, though.
if ( Number.class.isAssignableFrom( clazz ) ) {
return createTextField( attributes );
}
// Collections
if ( Collection.class.isAssignableFrom( clazz ) ) {
return new Stub();
}
}
// Not simple, but don't expand
if ( TRUE.equals( attributes.get( DONT_EXPAND ) ) ) {
return createTextField( attributes );
}
return null;
}
//
// Private methods
//
private TextField createTextField( Map attributes ) {
TextField textField = new TextField();
String maximumLength = attributes.get( MAXIMUM_LENGTH );
if ( maximumLength != null && !"".equals( maximumLength ) ) {
textField.setMaxLength( Integer.parseInt( attributes.get( MAXIMUM_LENGTH ) ) );
}
return textField;
}
private Component createSelectComponent( Map attributes, String lookup, VaadinMetawidget metawidget ) {
Select select = new Select();
// Add an empty choice (if nullable, and not required)
if ( !WidgetBuilderUtils.needsEmptyLookupItem( attributes ) ) {
select.setNullSelectionAllowed( false );
}
List values = CollectionUtils.fromString( lookup );
// May have alternate labels
Map labelsMap = null;
String lookupLabels = attributes.get( LOOKUP_LABELS );
if ( lookupLabels != null && !"".equals( lookupLabels ) ) {
labelsMap = CollectionUtils.newHashMap( values, CollectionUtils.fromString( attributes.get( LOOKUP_LABELS ) ) );
}
// Lookup the Class
//
// (use TYPE, not ACTUAL_TYPE, because an Enum with a value will get a type of Enum$1)
Class clazz;
String type = attributes.get( TYPE );
if ( type != null ) {
clazz = ClassUtils.niceForName( type );
} else {
clazz = null;
}
BindingConverter bindingConverter = metawidget.getWidgetProcessor( BindingConverter.class );
for ( String value : values ) {
Object convertedValue = value;
if ( bindingConverter != null && clazz != null ) {
convertedValue = bindingConverter.convertFromString( value, clazz );
}
select.addItem( convertedValue );
if ( labelsMap != null ) {
select.setItemCaption( convertedValue, labelsMap.get( value ) );
}
}
if ( !WidgetBuilderUtils.needsEmptyLookupItem( attributes ) ) {
select.setRequired( true );
}
return select;
}
}