JDAL Spring MVC and DisplayTag Sample

/**
 * Adapter from JDAL Page to DisplayTag PaginatedList
 * 
 * @author Jose Luis Martin
 */
@SuppressWarnings("unchecked")
public class PaginatedListAdapter implements PaginatedList {
 
	private Page<?> model;
 
	public PaginatedListAdapter() {
		this(new Page(10));
	}
 
	public PaginatedListAdapter(Page<?> model) {
		this.model = model;
	}
 
	/**
	 * {@inheritDoc}
	 */
	public int getFullListSize() {
		return model.getCount();
	}
 
	/**
	 * {@inheritDoc}
	 */
	public List getList() {
		return model.getData();
	}
 
	/**
	 * {@inheritDoc}
	 */
	public int getObjectsPerPage() {
		return model.getPageSize();
	}
 
	/**
	 * {@inheritDoc}
	 */
	public int getPageNumber() {
		return model.getPage();
	}
 
	/**
	 * {@inheritDoc}
	 */
	public String getSearchId() {
		return null;
	}
 
	/**
	 * {@inheritDoc}
	 */
	public String getSortCriterion() {
		return model.getSortName();
	}
 
	/**
	 * {@inheritDoc}
	 */
	public SortOrderEnum getSortDirection() {
		return model.getOrder() == Page.Order.ASC ? SortOrderEnum.ASCENDING : SortOrderEnum.DESCENDING;
	}
 
	/**
	 * @return the model
	 */
	public Page<?> getModel() {
		return model;
	}
 
	/**
	 * @param model the model to set
	 */
	public void setModel(Page<?> model) {
		this.model = model;
	}
 
	public void setPage(int page) {
		model.setPage(page);
	}
 
	public void setSort(String sort) {
		model.setSortName(sort);
	}
 
	public void setDir(String dir) {
		model.setOrder("asc".equalsIgnoreCase(dir) ? Page.Order.ASC : Page.Order.DESC);
	}
 
}
 

/**
 * Controller to handle "/book" requests
 * 
 * @author Jose Luis Martin 
 */
@Controller
@SessionAttributes("bookFilter")   // Store filter on Session
@SuppressWarnings("unchecked")
public class BookController  {
 
	/** Persistent service for book categories */
	PersistentService<Category, Long> categoryService;
	/** Persistent Service for Books */
	PersistentService<Book, Long> bookService;
 
	/**
	 * Handle getPage request. Gets the Page from PaginatedListAdapter wrapper
	 * and query service for data.
	 * @param paginatedList the displaytag PaginatedList interface
	 * @param filter filter to apply
	 * @return Model 
	 */
	@RequestMapping()
	public void getPage(@ModelAttribute("paginatedList") PaginatedListAdapter paginatedList, 
				@ModelAttribute("bookFilter") BookFilter filter) {
 
		Page<Book> page = (Page<Book>) paginatedList.getModel();
 
		page.setFilter(filter);
		bookService.getPage(page);
	}
 
	/**
	 * Add the category list to model 
	 * @return List with all categories
	 */
	@ModelAttribute("categoryList")
	public List<Category> getCategories() {
		return categoryService.getAll();
	}
 
	/**
	 * Need to register the CategoryPropertyEditor for mapping ids of 
	 * category select to Category objects in bd.
	 * @param binder
	 */
	@InitBinder
	public void initBinder(WebDataBinder binder) {
		binder.registerCustomEditor(Category.class, new CategoryPropertyEditor());
 
	}
 
 
	@ModelAttribute
	public BookFilter getBookFilter() {
		return new BookFilter();
	}
 
	/**
	 * @return the categoryService
	 */
	public PersistentService<Category, Long> getCategoryService() {
		return categoryService;
	}
 
	/**
	 * @param categoryService the categoryService to set
	 */
	public void setCategoryService(PersistentService<Category, Long> categoryService) {
		this.categoryService = categoryService;
	}
 
	/**
	 * @return the bookService
	 */
	public PersistentService<Book, Long> getBookService() {
		return bookService;
	}
 
	/**
	 * @param bookService the bookService to set
	 */
	public void setBookService(PersistentService<Book, Long> bookService) {
		this.bookService = bookService;
	}
 
	/**
	 * Property editor to map selected category from id string to Category.
	 */
	class CategoryPropertyEditor extends PropertyEditorSupport {
 
		/**
		 * {@inheritDoc}
		 */
		@Override
		public void setAsText(String text) throws IllegalArgumentException {
			Long id = Long.parseLong(text);
			Category value = id == 0 ? null : categoryService.get(id);
			setValue(value);
		}
 
		/**
		 * {@inheritDoc}
		 */
		@Override
		public String getAsText() {
			Category c = (Category) getValue();
			return c != null ? String.valueOf(c.getId()) : "";
		}
	}
}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>    
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ taglib uri="http://displaytag.sf.net" prefix="display" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
 
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="<c:out value="${pageContext.request.contextPath}"/>/styles/displaytag.css"/>
<title>JDAL Spring MVC and DisplayTag Sample</title>
</head>
<body>
<H1>JDAL Spring MVC and DisplayTag Sample</H1>
 
<form:form commandName="bookFilter" action="getPage" method="POST">
      <table>
          <tr>
              <td>Book Title:</td>
              <td><form:input path="name" /></td>
          </tr>
          <tr>
              <td>Category:</td>
              <td><form:select path="category">
                <form:option value="0">--Please Select</form:option>
                <form:options items="${categoryList}" itemValue="id" itemLabel="name" /><
                </form:select>
              </td>
          </tr>
           <tr>
              <td>ISBN:</td>
              <td><form:input path="isbn" /></td>
          </tr>
           <tr>
              <td>Author Name:</td>
              <td><form:input path="authorName" /></td>
          </tr>
           <tr>
              <td>Author Surname:</td>
              <td><form:input path="authorSurname" /></td>
          </tr>
          <tr>
              <td colspan="2">
                  <input type="submit" value="Apply Filter" />
              </td>
          </tr>
      </table>
  </form:form>
 
  <br>
 
  <display:table name="paginatedList" requestURI="getPage" >
    <display:column property="id" title="ID" sortable="true" style="width:80px" />
    <display:column property="name" title="Title" sortable="true" style="width:300px "/>
    <display:column property="category" title="Category" sortable="true" sortProperty="category.name" style="width:200px"/>
    <display:column property="author" title="Author" sortable="true" sortProperty="author.surname" style="width:200px" />
    <display:column property="isbn" title="ISBN" sortable="true" style="width:180px"/>
</display:table>
 
</body>
</html>