ValidatorUtils.java

/*
* Copyright 2011 Nicolas Frankel
*
* 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.moorevaadin.vaadin7.beanvalidation;

import java.util.Collection;

import com.vaadin.data.Validator;
import com.vaadin.data.validator.BeanValidator;
import com.vaadin.ui.Field;

public class ValidatorUtils {

	private ValidatorUtils() {}
	
	static void installSingleValidator(Field<?> field, String attribute) {
		
		Collection<Validator> validators = field.getValidators();

		if (validators == null || validators.isEmpty()) {

			field.addValidator(new BeanValidator(Person.class, attribute));
		}
	}
}