UserListPage.java

/* vim: set ts=2 et sw=2 cindent fo=qroca: */

package com.globant.katari.sample.wicket.view;

import java.util.Iterator;

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.navigation.paging.PagingNavigator;
import org.apache.wicket.markup.repeater.Item;
import org.apache.wicket.markup.repeater.data.DataView;
import org.apache.wicket.markup.repeater.data.IDataProvider;
import org.apache.wicket.model.CompoundPropertyModel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.LoadableDetachableModel;
import org.apache.wicket.spring.injection.annot.SpringBean;

import com.globant.katari.hibernate.coreuser.SecurityUtils;

import com.globant.katari.user.application.DeleteUserCommand;
import com.globant.katari.user.application.UserFilterCommand;
import com.globant.katari.user.domain.User;
import com.globant.katari.user.domain.filter.ContainsFilter;

/** Paginates through all the users.
 *
 * This is a wicket page that shows a paginated list of users.
 */
public class UserListPage extends WebPage {

  /** The number of elements per page.
   */
  private static final int DEFAULT_PAGE_SIZE = 5;

  /** The command that provides the list of users.
   *
   * Injected by spring, never null.
   */
  @SpringBean(name = "userFilterCommand")
  private UserFilterCommand filterCommand;

  /** The command that deletes a user.
   *
   * Injected by spring, never null.
   */
  @SpringBean
  private DeleteUserCommand deleteCommand;

  /** Constructor.
   */
  public UserListPage() {

    DataView<User> dataView;
    dataView = new DataView<User>("users", new UsersDataProvider()) {
      private static final long serialVersionUID = 7992666042888348658L;

      @SuppressWarnings("serial")
      public void populateItem(final Item<User> listItem) {
        final User user = listItem.getModelObject();
        listItem.setModel(new CompoundPropertyModel<User>(user));
        listItem.add(new Label("name"));
        listItem.add(new Label("email"));
        listItem.add(new UserPage.Link("edit", user).add(new Label("id")));
        listItem.add(new Link<User>("delete") {

          @Override
          public void onClick() {
            deleteCommand.setUserId(user.getId());
            deleteCommand.execute();
          }

          @Override
          protected CharSequence getOnClickScript(final CharSequence url) {
            return "if (!confirm('Are you sure you want to delete user "
              + user.getName() + "?')) return false;";
          }

          @Override
          public boolean isEnabled() {
            return user.getId() != SecurityUtils.getCurrentUser().getId();
          }

        });
      }
    };
    dataView.setItemsPerPage(DEFAULT_PAGE_SIZE);
    add(dataView);
    add(new PagingNavigator("pager", dataView));
  }

  /** Addapts the DataView to the the User list.
   */
  private class UsersDataProvider implements IDataProvider<User> {

    /** Serialization version.
     */
    private static final long serialVersionUID = 1L;

    /** Cache for the total number of users to show.
     */
    private int size = -1;

    /** {@inheritDoc}.
     */
    public Iterator<User> iterator(final int first, final int count) {
      int currentPage = 0;
      if (count != 0) {
        currentPage = first / count;
      }
      filterCommand.getPaging().setPageNumber(currentPage);
      filterCommand.getPaging().setPageSize(count);
      return filterCommand.execute().iterator();
    }

    /** {@inheritDoc}.
     */
    @SuppressWarnings("serial")
    public IModel<User> model(final User user) {
      return new LoadableDetachableModel<User>() {
        @Override
        protected User load() {
          return user;
        }
      };
    }

    /** {@inheritDoc}.
     */
    public int size() {
      if (size == -1) {
        filterCommand.setContainsFilter(new ContainsFilter());
        filterCommand.getPaging().setPageSize(0);
        size = filterCommand.execute().size();
      }
      return size;
    }

    /** {@inheritDoc}
     */
    public void detach() {
    }
  }
}