/**
* Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, version 2.1, dated February 1999.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the latest version of the GNU Lesser General
* Public License as published by the Free Software Foundation;
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program (LICENSE.txt); if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package org.jamwiki.taglib;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.BodyTagSupport;
import org.jamwiki.DataAccessException;
import org.jamwiki.utils.WikiLogger;
import org.jamwiki.utils.Pagination;
import org.jamwiki.utils.LinkUtil;
import org.jamwiki.utils.Utilities;
import org.jamwiki.utils.WikiLink;
import org.jamwiki.utils.WikiUtil;
/**
* JSP tag used to generate a pagination object.
*/
public class PaginationTag extends BodyTagSupport {
private static final WikiLogger logger = WikiLogger.getLogger(PaginationTag.class.getName());
private String rootUrl = null;
private String total = null;
/**
*
*/
public int doEndTag() throws JspException {
try {
this.pageContext.getOut().print(pagination(this.rootUrl, Integer.valueOf(this.total)));
} catch (IOException e) {
logger.severe("Failure while building pagination object", e);
throw new JspException(e);
}
return EVAL_PAGE;
}
/**
*
*/
private StringBuilder buildOption(int num, Pagination pagination, String baseUrl) {
HttpServletRequest request = (HttpServletRequest)this.pageContext.getRequest();
StringBuilder output = new StringBuilder();
if (num == pagination.getNumResults()) {
output.append(num);
return output;
}
output.append("<a href=\"");
String virtualWiki = WikiUtil.getVirtualWikiFromRequest(request);
WikiLink wikiLink = LinkUtil.parseWikiLink(baseUrl);
String query = LinkUtil.appendQueryParam(wikiLink.getQuery(), "num", Integer.toString(num));
query += "&offset=0";
wikiLink.setQuery(query);
try {
output.append(LinkUtil.buildTopicUrl(request.getContextPath(), virtualWiki, wikiLink));
} catch (DataAccessException e) {
logger.warning("Failure while building pagination element", e);
return new StringBuilder();
}
output.append("\">");
output.append(num);
output.append("</a>");
return output;
}
/**
*
*/
public String getRootUrl() {
return this.rootUrl;
}
/**
*
*/
public String getTotal() {
return this.total;
}
/**
*
*/
private StringBuilder nextPage(Pagination pagination, String baseUrl, int count, boolean previous) {
HttpServletRequest request = (HttpServletRequest)this.pageContext.getRequest();
StringBuilder output = new StringBuilder();
Object[] objects = new Object[1];
objects[0] = pagination.getNumResults();
if (pagination.getOffset() == 0 && previous) {
output.append(Utilities.formatMessage("common.pagination.previous", request.getLocale(), objects));
return output;
}
if (pagination.getNumResults() != count && !previous) {
output.append(Utilities.formatMessage("common.pagination.next", request.getLocale(), objects));
return output;
}
output.append("<a href=\"");
String virtualWiki = WikiUtil.getVirtualWikiFromRequest(request);
WikiLink wikiLink = LinkUtil.parseWikiLink(baseUrl);
int offset = pagination.getOffset() + pagination.getNumResults();
if (previous) {
offset = pagination.getOffset() - pagination.getNumResults();
if (offset < 0) {
offset = 0;
}
}
String query = LinkUtil.appendQueryParam(wikiLink.getQuery(), "num", Integer.toString(pagination.getNumResults()));
query += "&offset=" + offset;
wikiLink.setQuery(query);
try {
output.append(LinkUtil.buildTopicUrl(request.getContextPath(), virtualWiki, wikiLink));
} catch (DataAccessException e) {
logger.warning("Failure while building pagination element", e);
return new StringBuilder();
}
output.append("\">");
if (previous) {
output.append(Utilities.formatMessage("common.pagination.previous", request.getLocale(), objects));
} else {
output.append(Utilities.formatMessage("common.pagination.next", request.getLocale(), objects));
}
output.append("</a>");
return output;
}
/**
*
*/
private StringBuilder numResults(Pagination pagination, String baseUrl) {
HttpServletRequest request = (HttpServletRequest)this.pageContext.getRequest();
StringBuilder output = new StringBuilder();
output.append(Utilities.formatMessage("common.pagination.results", request.getLocale())).append(": ");
output.append(buildOption(10, pagination, baseUrl));
output.append(" | ");
output.append(buildOption(25, pagination, baseUrl));
output.append(" | ");
output.append(buildOption(50, pagination, baseUrl));
output.append(" | ");
output.append(buildOption(100, pagination, baseUrl));
output.append(" | ");
output.append(buildOption(250, pagination, baseUrl));
output.append(" | ");
output.append(buildOption(500, pagination, baseUrl));
return output;
}
/**
*
*/
private String pagination(String baseUrl, int count) {
HttpServletRequest request = (HttpServletRequest)this.pageContext.getRequest();
Pagination pagination = WikiUtil.buildPagination(request);
StringBuilder output = new StringBuilder();
output.append(this.nextPage(pagination, baseUrl, count, true));
output.append(" | ");
output.append(this.nextPage(pagination, baseUrl, count, false));
output.append("  (");
output.append(this.numResults(pagination, baseUrl));
output.append(')');
return output.toString();
}
/**
*
*/
public void setRootUrl(String rootUrl) {
this.rootUrl = rootUrl;
}
/**
*
*/
public void setTotal(String total) {
this.total = total;
}
}