editbook.java

Wicket一个开发Java Web应用程序框架。它使得开发web应用程序变得容易而轻松。 Wicket利用一个POJO data beans组件使得它可以与任何持久层技术相结合。

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.wicket.examples.library;


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

import org.apache.wicket.Page;
import org.apache.wicket.PageParameters;
import org.apache.wicket.RequestCycle;
import org.apache.wicket.markup.html.form.CheckBox;
import org.apache.wicket.markup.html.form.DropDownChoice;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.ListMultipleChoice;
import org.apache.wicket.markup.html.form.RadioChoice;
import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.markup.html.form.validation.FormComponentFeedbackBorder;
import org.apache.wicket.markup.html.link.IPageLink;
import org.apache.wicket.markup.html.link.PageLink;
import org.apache.wicket.markup.html.panel.FeedbackPanel;
import org.apache.wicket.model.CompoundPropertyModel;
import org.apache.wicket.util.lang.EnumeratedType;
import org.apache.wicket.validation.validator.StringValidator;


/**
 * A page that contains a form that allows editing of books.
 * 
 * @author Jonathan Locke
 */
public final class EditBook extends AuthenticatedWebPage
{
	static final Book otherBook = new Book("Frisbee Techniques", "Marty van Hoff", Book.FICTION);

	/**
	 * Constructs a page that edits a book
	 * 
	 * @param book
	 *            The book to edit
	 */
	public EditBook(final Book book)
	{
		// Create and add feedback panel to page
		final FeedbackPanel feedback = new FeedbackPanel("feedback");

		add(feedback);

		// Add edit book form to page
		add(new EditBookForm("editBookForm", book));
	}

	/**
	 * Gets a link to a page that will edit a book
	 * 
	 * @param name
	 *            The name of the link
	 * @param id
	 *            The id of the book that the page will edit
	 * @return The page link
	 */
	public static PageLink link(final String name, final long id)
	{
		return new PageLink(name, new IPageLink()
		{
			public Page getPage()
			{
				return new EditBook(Book.get(id));
			}

			public Class getPageIdentity()
			{
				return EditBook.class;
			}
		});
	}

	/**
	 * Form that edits a book
	 * 
	 * @author Jonathan Locke
	 */
	static public final class EditBookForm extends Form
	{
		/**
		 * Constructor
		 * 
		 * @param id
		 *            id of form
		 * @param book
		 *            Book model
		 */
		public EditBookForm(final String id, final Book book)
		{
			super(id, new CompoundPropertyModel(book));

			// Create a required text field with a max length of 30 characters
			// that edits the book's title
			final TextField title = new TextField("title");
			title.setRequired(true);
			title.add(StringValidator.maximumLength(30));
			final FormComponentFeedbackBorder titleFeedback = new FormComponentFeedbackBorder(
					"titleFeedback");
			add(titleFeedback);
			titleFeedback.add(title);

			// Create a required text field that edits the book's author
			final TextField author = new TextField("author");
			author.setRequired(true);
			final FormComponentFeedbackBorder authorFeedback = new FormComponentFeedbackBorder(
					"authorFeedback");
			add(authorFeedback);
			authorFeedback.add(author);

			// Add fiction checkbox
			add(new CheckBox("fiction"));

			// Books is everything but otherBook
			List books = new ArrayList();

			books.addAll(Book.getBooks());
			books.remove(otherBook);

			// Add companion book choice
			add(new DropDownChoice("companionBook", books));

			// Add radio choice test
			final RadioChoice relatedBook = new RadioChoice("relatedBook", books);
			add(relatedBook);

			// Multi-select among writing styles
			add(new ListMultipleChoice("writingStyles", EnumeratedType
					.getValues(Book.WritingStyle.class)));
		}

		/**
		 * Show the resulting valid edit
		 */
		public final void onSubmit()
		{
			final RequestCycle cycle = getRequestCycle();
			PageParameters parameters = new PageParameters();
			final Book book = (Book)getModelObject();
			parameters.put("id", book.getId());
			cycle.setResponsePage(getPageFactory().newPage(BookDetails.class, parameters));
			cycle.setRedirect(true);
		}
	}
}