package de.forsthaus.webui.util.pagging;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.zkoss.lang.Strings;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.EventListener;
import org.zkoss.zkplus.databind.BindingListModelList;
import org.zkoss.zul.FieldComparator;
import org.zkoss.zul.Listbox;
import org.zkoss.zul.Listhead;
import org.zkoss.zul.Listheader;
import org.zkoss.zul.Listitem;
import org.zkoss.zul.Paging;
import org.zkoss.zul.event.PagingEvent;
import com.trg.search.SearchResult;
import de.forsthaus.backend.service.PagedListService;
import de.forsthaus.backend.util.HibernateSearchObject;
/**
* Helper class for getting a paged record list that are be sorted on the
* database and reacts on clicking the listheaders. <br>
* Look at the <b>OnSortEventListener</b> and <b>OnPagingEventListener</b>.<br>
* <br>
* This class works with a BindingListModelList for working with the zk's
* databinding mechanism. <br>
*
* All not used Listheaders must me declared as: <br>
* listheader.setSortAscending(""); <br>
* listheader.setSortDescending(""); <br>
*
* <br>
* zkoss 3.6.0 or greater (by using FieldComparator) <br>
* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<br>
*
* @changes 05/02/2010: sge Changed to BindingListModelList.<br>
*
* @author bbruhns
* @author Stephan Gerth
*/
public class PagedBindingListWrapper<E> extends BindingListModelList implements Serializable {
private static final long serialVersionUID = 1L;
static final Logger logger = Logger.getLogger(PagedBindingListWrapper.class);
// Service that calls the DAO methods
private PagedListService pagedListService;
// param. The listboxes paging component
private Paging paging;
// The Listbox component
private Listbox listbox;
// param. The SearchObject, holds the entity and properties to search. <br>
private HibernateSearchObject<E> hibernateSearchObject;
/**
* default constructor.<br>
*/
public PagedBindingListWrapper() {
super(new ArrayList<E>(), true);
}
public void init(HibernateSearchObject<E> hibernateSearchObject1, Listbox listBox, Paging paging1) {
setPaging(paging1);
setListeners(listBox);
setListbox(listBox);
setSearchObject(hibernateSearchObject1);
}
private void initModel() {
getSearchObject().setFirstResult(0);
getSearchObject().setMaxResults(getPageSize());
// clear old data
clear();
final SearchResult<E> searchResult = getPagedListService().getSRBySearchObject(getSearchObject());
getPaging().setTotalSize(searchResult.getTotalCount());
addAll(searchResult.getResult());
}
/**
* Refreshes the list by calling the DAO methode with the modified search
* object. <br>
*
* @param start
* Row to start. <br>
*/
void refreshModel(int start) {
getSearchObject().setFirstResult(start);
getSearchObject().setMaxResults(getPageSize());
// clear old data
clear();
addAll(getPagedListService().getBySearchObject(getSearchObject()));
}
public void clearFilters() {
getSearchObject().clearFilters();
initModel();
}
/**
* Sets the listeners. <br>
* <br>
* 1. "onPaging" for the paging component. <br>
* 2. "onSort" for all listheaders that have a sortDirection declared. <br>
* All not used Listheaders must me declared as:
* listheader.setSortAscending(""); listheader.setSortDescending(""); <br>
*/
private void setListeners(Listbox listBox) {
// Add 'onPaging' listener to the paging component
getPaging().addEventListener("onPaging", new OnPagingEventListener());
final Listhead listhead = listBox.getListhead();
final List<?> list = listhead.getChildren();
final OnSortEventListener onSortEventListener = new OnSortEventListener();
for (final Object object : list) {
if (object instanceof Listheader) {
final Listheader lheader = (Listheader) object;
if (lheader.getSortAscending() != null || lheader.getSortDescending() != null) {
lheader.addEventListener("onSort", onSortEventListener);
}
}
}
listBox.setModel(this);
}
/**
* "onPaging" EventListener for the paging component. <br>
* <br>
* Calculates the next page by currentPage and pageSize values. <br>
* Calls the method for refreshing the data with the new rowStart and
* pageSize. <br>
*/
public final class OnPagingEventListener implements EventListener {
@Override
public void onEvent(Event event) throws Exception {
// deselect selectedBean
// TODO don't work in expected way
// evtl. mittels Reflection den zu uebergebenen selectedItem bean
// mit setXXXXX(null) setzen.
final Listitem li = getListbox().getSelectedItem();
if (li != null) {
li.setSelected(false);
}
final PagingEvent pe = (PagingEvent) event;
final int pageNo = pe.getActivePage();
final int start = pageNo * getPageSize();
// refresh the list
refreshModel(start);
}
}
/**
* "onSort" eventlistener for the listheader components. <br>
* <br>
* Checks wich listheader is clicked and checks which orderDirection must be
* set. <br>
*
* Calls the methode for refreshing the data with the new ordering. and the
* remembered rowStart and pageSize. <br>
*/
public final class OnSortEventListener implements EventListener, Serializable {
private static final long serialVersionUID = 1L;
@Override
public void onEvent(Event event) throws Exception {
final Listheader lh = (Listheader) event.getTarget();
final String sortDirection = lh.getSortDirection();
if ("ascending".equals(sortDirection)) {
final Comparator<?> cmpr = lh.getSortDescending();
if (cmpr instanceof FieldComparator) {
String orderBy = ((FieldComparator) cmpr).getOrderBy();
orderBy = StringUtils.substringBefore(orderBy, "DESC").trim();
// update SearchObject with orderBy
getSearchObject().clearSorts();
getSearchObject().addSort(orderBy, true);
}
} else if ("descending".equals(sortDirection) || "natural".equals(sortDirection) || Strings.isBlank(sortDirection)) {
final Comparator<?> cmpr = lh.getSortAscending();
if (cmpr instanceof FieldComparator) {
String orderBy = ((FieldComparator) cmpr).getOrderBy();
orderBy = StringUtils.substringBefore(orderBy, "ASC").trim();
// update SearchObject with orderBy
getSearchObject().clearSorts();
getSearchObject().addSort(orderBy, false);
}
}
/**
* A changing of the sort order implies that the list starts new. So
* we set the startpage to '0' and refresh the list.
*/
getPaging().setActivePage(0);
refreshModel(0);
}
}
public PagedListService getPagedListService() {
return this.pagedListService;
}
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++//
// ++++++++++++++++++ getter / setter +++++++++++++++++++//
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++//
HibernateSearchObject<E> getSearchObject() {
return this.hibernateSearchObject;
}
public void setSearchObject(HibernateSearchObject<E> hibernateSearchObject1) {
this.hibernateSearchObject = hibernateSearchObject1;
initModel();
}
public int getPageSize() {
return getPaging().getPageSize();
}
private void setPaging(Paging paging) {
this.paging = paging;
}
Paging getPaging() {
return this.paging;
}
public void setPagedListService(PagedListService pagedListService) {
this.pagedListService = pagedListService;
}
public void setListbox(Listbox listbox) {
this.listbox = listbox;
}
public Listbox getListbox() {
return this.listbox;
}
}