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- /*
- @VaadinApache2LicenseForJavaFiles@
- */
- 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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