de.flapdoodle.wicket.examples.model.UseModelsPage.java Source code

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Here is the source code for de.flapdoodle.wicket.examples.model.UseModelsPage.java

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/**
 * Copyright (C) 2011
 *   Michael Mosmann <michael@mosmann.de>
 *   Jan Bernitt <unknown@email.de>
 *
 * with contributions from
 *    nobody yet
 *
 * 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.flapdoodle.wicket.examples.model;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.link.Link;
import org.apache.wicket.markup.html.list.ListItem;
import org.apache.wicket.markup.html.list.ListView;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;

import de.flapdoodle.functions.Function1;
import de.flapdoodle.wicket.model.Models;

public class UseModelsPage extends WebPage {

    public UseModelsPage() {
        final ArrayList<String> source = new ArrayList<String>(Arrays.asList("first", "second", "third"));

        IModel<List<String>> listModel = Models.unmodifiable(source);

        IModel<List<String>> emptyIfNullListModel = Models.emptyIfNull(listModel);

        IModel<Integer> listSizeModel = Models.on(emptyIfNullListModel)
                .apply(new Function1<Integer, List<String>>() {
                    @Override
                    public Integer apply(List<String> value) {
                        return value.size();
                    }
                });

        IModel<String> firstEntryModel = Models.on(emptyIfNullListModel)
                .apply(new Function1<String, List<String>>() {
                    @Override
                    public String apply(List<String> value) {
                        return !value.isEmpty() ? value.get(0) : null;
                    }
                });

        final WebMarkupContainer ajaxBorder = new WebMarkupContainer("ajaxBorder");
        ajaxBorder.setOutputMarkupId(true);

        ajaxBorder.add(new ListView<String>("list", emptyIfNullListModel) {
            @Override
            protected void populateItem(ListItem<String> item) {
                item.add(new Label("label", item.getModel()));
                item.add(new AjaxLink<String>("link", Model.of(item.getModelObject())) {
                    @Override
                    public void onClick(AjaxRequestTarget target) {
                        source.remove(getModelObject());
                        target.add(ajaxBorder);
                    }
                });
            }
        });

        ajaxBorder.add(new Label("size", listSizeModel));
        ajaxBorder.add(new Label("first", firstEntryModel));
        add(ajaxBorder);
    }
}