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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.data.fieldgroup;
import java.lang.reflect.Method;
import com.vaadin.data.Item;
import com.vaadin.data.util.BeanItem;
import com.vaadin.data.validator.BeanValidator;
import com.vaadin.ui.Field;
public class BeanFieldGroup<T> extends FieldGroup {
private Class<T> beanType;
private static Boolean beanValidationImplementationAvailable = null;
public BeanFieldGroup(Class<T> beanType) {
this.beanType = beanType;
}
@Override
protected Class<?> getPropertyType(Object propertyId) {
if (getItemDataSource() != null) {
return super.getPropertyType(propertyId);
} else {
// Data source not set so we need to figure out the type manually
/*
* toString should never really be needed as propertyId should be of
* form "fieldName" or "fieldName.subField[.subField2]" but the
* method declaration comes from parent.
*/
java.lang.reflect.Field f;
try {
f = getField(beanType, propertyId.toString());
return f.getType();
} catch (SecurityException e) {
throw new BindException("Cannot determine type of propertyId '"
+ propertyId + "'.", e);
} catch (NoSuchFieldException e) {
throw new BindException("Cannot determine type of propertyId '"
+ propertyId + "'. The propertyId was not found in "
+ beanType.getName(), e);
}
}
}
private static java.lang.reflect.Field getField(Class<?> cls,
String propertyId) throws SecurityException, NoSuchFieldException {
if (propertyId.contains(".")) {
String[] parts = propertyId.split("\\.", 2);
// Get the type of the field in the "cls" class
java.lang.reflect.Field field1 = getField(cls, parts[0]);
// Find the rest from the sub type
return getField(field1.getType(), parts[1]);
} else {
try {
// Try to find the field directly in the given class
java.lang.reflect.Field field1 = cls
.getDeclaredField(propertyId);
return field1;
} catch (NoSuchFieldError e) {
// Try super classes until we reach Object
Class<?> superClass = cls.getSuperclass();
if (superClass != Object.class) {
return getField(superClass, propertyId);
} else {
throw e;
}
}
}
}
/**
* Helper method for setting the data source directly using a bean. This
* method wraps the bean in a {@link BeanItem} and calls
* {@link #setItemDataSource(Item)}.
*
* @param bean
* The bean to use as data source.
*/
public void setItemDataSource(T bean) {
setItemDataSource(new BeanItem(bean));
}
@Override
public void setItemDataSource(Item item) {
if (!(item instanceof BeanItem)) {
throw new RuntimeException(getClass().getSimpleName()
+ " only supports BeanItems as item data source");
}
super.setItemDataSource(item);
}
@Override
public BeanItem<T> getItemDataSource() {
return (BeanItem<T>) super.getItemDataSource();
}
@Override
public void bind(Field field, Object propertyId) {
if (getItemDataSource() != null) {
// The data source is set so the property must be found in the item.
// If it is not we try to add it.
try {
getItemProperty(propertyId);
} catch (BindException e) {
// Not found, try to add a nested property;
// BeanItem property ids are always strings so this is safe
getItemDataSource().addNestedProperty((String) propertyId);
}
}
super.bind(field, propertyId);
}
@Override
protected void configureField(Field<?> field) {
super.configureField(field);
// Add Bean validators if there are annotations
if (isBeanValidationImplementationAvailable()) {
BeanValidator validator = new BeanValidator(beanType,
getPropertyId(field).toString());
field.addValidator(validator);
if (field.getLocale() != null) {
validator.setLocale(field.getLocale());
}
}
}
/**
* Checks whether a bean validation implementation (e.g. Hibernate Validator
* or Apache Bean Validation) is available.
*
* TODO move this method to some more generic location
*
* @return true if a JSR-303 bean validation implementation is available
*/
protected static boolean isBeanValidationImplementationAvailable() {
if (beanValidationImplementationAvailable != null) {
return beanValidationImplementationAvailable;
}
try {
Class<?> validationClass = Class
.forName("javax.validation.Validation");
Method buildFactoryMethod = validationClass
.getMethod("buildDefaultValidatorFactory");
Object factory = buildFactoryMethod.invoke(null);
beanValidationImplementationAvailable = (factory != null);
} catch (Exception e) {
// no bean validation implementation available
beanValidationImplementationAvailable = false;
}
return beanValidationImplementationAvailable;
}
}
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