PaginatedResultIterator.java
/*
* Copyright (C) 2003-2008 eXo Platform SAS.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Affero General Public License
* as published by the Free Software Foundation; either version 3
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see<http://www.gnu.org/licenses/>.
*/
package org.exoplatform.services.wcm.publication;
import org.exoplatform.commons.exception.ExoMessageException;
import org.exoplatform.commons.utils.PageList;
import org.exoplatform.services.wcm.utils.WCMCoreUtils;
import java.util.ArrayList;
import java.util.List;
/**
* Created by The eXo Platform SAS
* Author : Hoa Pham
* hoa.phamvu@exoplatform.com
* Oct 17, 2008
*/
@SuppressWarnings({ "deprecation", "unchecked" })
public class PaginatedResultIterator extends PageList {
/** The nodes. */
protected Result result;
/**
* Instantiates a new paginated node iterator.
*
* @param pageSize the page size
*/
public PaginatedResultIterator(int pageSize) {
super(pageSize);
}
public PaginatedResultIterator(Result result, int pageSize) {
super(pageSize);
this.result = result;
this.setAvailablePage((int)result.getNumTotal());
this.currentListPage_ = null;
}
/* (non-Javadoc)
* @see org.exoplatform.commons.utils.PageList#populateCurrentPage(int)
*/
protected void populateCurrentPage(int page) throws Exception {
if(page == currentPage_) {
if(currentListPage_ != null)
return;
}
currentListPage_ = new ArrayList();
WCMComposer composer = WCMCoreUtils.getService(WCMComposer.class);
result.getFiltersDescriber().put(WCMComposer.FILTER_LIMIT, ""+this.getPageSize());
result.getFiltersDescriber().put(WCMComposer.FILTER_OFFSET, ""+(this.getPageSize()*(page-1)));
result.getFiltersDescriber().put(WCMComposer.FILTER_TOTAL, ""+this.result.getNumTotal());
result = composer.getPaginatedContents(result.getNodeLocationDescriber(),
result.getFiltersDescriber(),
WCMCoreUtils.getUserSessionProvider());
currentListPage_ = result.getNodes();
currentPage_ = page;
}
/**
* Retrieve the total pages.
*
* @return the total pages
*/
public int getTotalPages() { return getAvailablePage(); }
/**
* Retrieve the nodes per page.
*
* @return the nodes per page
*/
public int getNodesPerPage() { return getPageSize(); }
/**
* Retrieve the total nodes.
*
* @return the total nodes
*/
public long getTotalNodes() {
return result.getNumTotal();
}
/**
* Retrieve the nodes of current page.
*
* @return the current page data
*
* @throws Exception the exception
*/
public List getCurrentPageData() throws Exception {
return currentPage();
}
/* (non-Javadoc)
* @see org.exoplatform.commons.utils.PageList#getPage(int)
*/
public List getPage(int page) throws Exception {
if (page < 1 || page > availablePage_) {
Object[] args = { Integer.toString(page), Integer.toString(availablePage_) };
throw new ExoMessageException("PageList.page-out-of-range", args);
}
populateCurrentPage(page);
while (currentListPage_ != null && currentListPage_.size() == 0 && page > 1) {
page--;
result.setNumTotal(page * this.getPageSize());
populateCurrentPage(page);
availablePage_ = page;
}
return currentListPage_;
}
/**
* Change page.
*
* @param page the page
*
* @throws Exception the exception
*/
public void changePage(int page) throws Exception {
populateCurrentPage(page);
}
/* (non-Javadoc)
* @see org.exoplatform.commons.utils.PageList#getAll()
*/
public List getAll() throws Exception {
throw new UnsupportedOperationException();
}
}