Java tutorial
/* * Copyright 2011 Daisuke Miyamoto. * Created on 2012/07/13 * * 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 jp.xet.uncommons.wicket.behavior; import jp.xet.uncommons.wicket.utils.WicketUtil; import org.apache.wicket.Component; import org.apache.wicket.behavior.Behavior; import org.apache.wicket.markup.repeater.data.IDataProvider; import org.apache.wicket.util.lang.Args; /** * ?? {@link IDataProvider} ???<em>????</em>?? visibility ?ON?? * * @since 1.8 * @version $Id: VisibleIfProviderIsNotEmptyBehavior.java 8627 2012-10-12 02:30:06Z miyamoto $ * @author daisuke */ @SuppressWarnings("serial") public class VisibleIfProviderIsNotEmptyBehavior extends Behavior { private final IDataProvider<?> provider; /** * ?? * * @param provider dependent {@link IDataProvider} * @throws IllegalArgumentException ?{@code null}??? * @since 1.8 */ public VisibleIfProviderIsNotEmptyBehavior(IDataProvider<?> provider) { Args.notNull(provider, "provider"); this.provider = provider; } @Override public void detach(Component component) { WicketUtil.detachIfNotNull(provider); super.detach(component); } @Override public void onConfigure(Component component) { super.onConfigure(component); component.setVisibilityAllowed(provider != null && provider.size() > 0); } }