jp.xet.uncommons.wicket.behavior.VisibleIfCollectionIsNotEmptyBehavior.java Source code

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Here is the source code for jp.xet.uncommons.wicket.behavior.VisibleIfCollectionIsNotEmptyBehavior.java

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/*
 * Copyright 2011 Daisuke Miyamoto.
 * Created on 2012/06/19
 *
 * 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 java.util.Collection;

import jp.xet.uncommons.wicket.utils.WicketUtil;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.model.IModel;
import org.apache.wicket.util.lang.Args;

/**
 * ?????<em>????</em>?? visibility ?ON??
 * 
 * @since 1.8
 * @version $Id: VisibleIfCollectionIsNotEmptyBehavior.java 8627 2012-10-12 02:30:06Z miyamoto $
 * @author daisuke
 */
@SuppressWarnings("serial")
public class VisibleIfCollectionIsNotEmptyBehavior extends Behavior {

    private final IModel<? extends Collection<?>> model;

    /**
     * ??
     * 
     * @param model dependent collection model
     * @throws IllegalArgumentException ?{@code null}???
     * @since 1.8
     */
    public VisibleIfCollectionIsNotEmptyBehavior(IModel<? extends Collection<?>> model) {
        Args.notNull(model, "model");
        this.model = model;
    }

    @Override
    public void detach(Component component) {
        WicketUtil.detachIfNotNull(model);
        super.detach(component);
    }

    @Override
    public void onConfigure(Component component) {
        super.onConfigure(component);
        Collection<?> object = model.getObject();
        component.setVisibilityAllowed(object != null && object.isEmpty() == false);
    }
}