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/*
* Copyright 2011 Vaadin Ltd.
*
* 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.vaadin.ui;
import java.util.Date;
import com.vaadin.data.Container;
import com.vaadin.data.Item;
import com.vaadin.data.Property;
/**
* This class contains a basic implementation for both {@link FormFieldFactory}
* and {@link TableFieldFactory}. The class is singleton, use {@link #get()}
* method to get reference to the instance.
*
* <p>
* There are also some static helper methods available for custom built field
* factories.
*
*/
public class DefaultFieldFactory implements FormFieldFactory, TableFieldFactory {
private static final DefaultFieldFactory instance = new DefaultFieldFactory();
/**
* Singleton method to get an instance of DefaultFieldFactory.
*
* @return an instance of DefaultFieldFactory
*/
public static DefaultFieldFactory get() {
return instance;
}
protected DefaultFieldFactory() {
}
@Override
public Field<?> createField(Item item, Object propertyId,
Component uiContext) {
Class<?> type = item.getItemProperty(propertyId).getType();
Field<?> field = createFieldByPropertyType(type);
field.setCaption(createCaptionByPropertyId(propertyId));
return field;
}
@Override
public Field<?> createField(Container container, Object itemId,
Object propertyId, Component uiContext) {
Property<?> containerProperty = container.getContainerProperty(itemId,
propertyId);
Class<?> type = containerProperty.getType();
Field<?> field = createFieldByPropertyType(type);
field.setCaption(createCaptionByPropertyId(propertyId));
return field;
}
/**
* If name follows method naming conventions, convert the name to spaced
* upper case text. For example, convert "firstName" to "First Name"
*
* @param propertyId
* @return the formatted caption string
*/
public static String createCaptionByPropertyId(Object propertyId) {
String name = propertyId.toString();
if (name.length() > 0) {
int dotLocation = name.lastIndexOf('.');
if (dotLocation > 0 && dotLocation < name.length() - 1) {
name = name.substring(dotLocation + 1);
}
if (name.indexOf(' ') < 0
&& name.charAt(0) == Character.toLowerCase(name.charAt(0))
&& name.charAt(0) != Character.toUpperCase(name.charAt(0))) {
StringBuffer out = new StringBuffer();
out.append(Character.toUpperCase(name.charAt(0)));
int i = 1;
while (i < name.length()) {
int j = i;
for (; j < name.length(); j++) {
char c = name.charAt(j);
if (Character.toLowerCase(c) != c
&& Character.toUpperCase(c) == c) {
break;
}
}
if (j == name.length()) {
out.append(name.substring(i));
} else {
out.append(name.substring(i, j));
out.append(" " + name.charAt(j));
}
i = j + 1;
}
name = out.toString();
}
}
return name;
}
/**
* Creates fields based on the property type.
* <p>
* The default field type is {@link TextField}. Other field types generated
* by this method:
* <p>
* <b>Boolean</b>: {@link CheckBox}.<br/>
* <b>Date</b>: {@link DateField}(resolution: day).<br/>
* <b>Item</b>: {@link Form}. <br/>
* <b>default field type</b>: {@link TextField}.
* <p>
*
* @param type
* the type of the property
* @return the most suitable generic {@link Field} for given type
*/
public static Field<?> createFieldByPropertyType(Class<?> type) {
// Null typed properties can not be edited
if (type == null) {
return null;
}
// Item field
if (Item.class.isAssignableFrom(type)) {
return new Form();
}
// Date field
if (Date.class.isAssignableFrom(type)) {
final DateField df = new DateField();
df.setResolution(DateField.RESOLUTION_DAY);
return df;
}
// Boolean field
if (Boolean.class.isAssignableFrom(type)) {
return new CheckBox();
}
return new TextField();
}
}
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