Java tutorial
/* * Copyright (C) 2016 Singular Studios (a.k.a Atom Tecnologia) - www.opensingular.com * * 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 org.opensingular.form.wicket.behavior; import org.apache.wicket.Component; import org.apache.wicket.behavior.Behavior; import org.opensingular.lib.wicket.util.model.NullOrEmptyModel; public class InvisibleIfNullOrEmptyBehavior extends Behavior { private static final InvisibleIfNullOrEmptyBehavior INSTANCE = new InvisibleIfNullOrEmptyBehavior(); public static InvisibleIfNullOrEmptyBehavior getInstance() { return INSTANCE; } private InvisibleIfNullOrEmptyBehavior() { } @Override public void onConfigure(Component component) { component.setVisible(!NullOrEmptyModel.nullOrEmpty(component.getDefaultModelObject())); } }