Java tutorial
/* * Copyright 2012 m_yamamo0417 * * 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.myamamoto.wicket.misc.compound; import org.apache.wicket.validation.IValidatable; import org.apache.wicket.validation.ValidationError; import org.apache.wicket.validation.INullAcceptingValidator; public class NotNullValidator<T> implements INullAcceptingValidator<T> { private final String label; public NotNullValidator(String label) { this.label = label; } public void validate(IValidatable<T> validatable) { if (null == validatable.getValue()) { ValidationError error = new ValidationError(); error.addMessageKey("Required"); error.setVariable("label", label); validatable.error(error); } } }