/*
* Copyright 2011 SWM Services GmbH.
*
* 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 de.swm.commons.mobile.client.validation;
import com.google.gwt.user.client.ui.HasValue;
/**
* Interface for validating a field's value.
* @param <T> the type of the field Value.
*/
public interface IValidator<T> {
/**
* Validates the fields value.
*
* @param field
* the field with his field value
*
* @return <code>null</code> if validation passes, otherwise the error message
*/
public String validate(HasValue<T> field);
}