/**
* 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.apache.commons.lang.StringUtils;
import org.jamwiki.DataAccessException;
import org.jamwiki.utils.LinkUtil;
import org.jamwiki.utils.WikiLink;
import org.jamwiki.utils.WikiLogger;
import org.jamwiki.utils.WikiUtil;
/**
* JSP tag that creates an HTML link to a Wiki topic, generating the servlet
* context and virtual wiki in the link and also properly encoding the topic
* for use in the URL.
*/
public class LinkTag extends BodyTagSupport {
private static final WikiLogger logger = WikiLogger.getLogger(LinkTag.class.getName());
private String style = null;
private String target = null;
private String text = null;
private String value = null;
private String queryParams = "";
/**
*
*/
public int doEndTag() throws JspException {
String tagTarget = null;
if (!StringUtils.isBlank(this.target)) {
tagTarget = this.target;
}
WikiLink wikiLink = LinkUtil.parseWikiLink(this.value);
String tagText = buildLinkText();
HttpServletRequest request = (HttpServletRequest)this.pageContext.getRequest();
String url = null;
String virtualWiki = WikiUtil.getVirtualWikiFromRequest(request);
if (!StringUtils.isBlank(this.queryParams)) {
wikiLink.setQuery(this.queryParams);
}
try {
if (!StringUtils.isBlank(tagText)) {
// return formatted link of the form "<a href="/wiki/en/Special:Edit">text</a>"
url = LinkUtil.buildInternalLinkHtml(request.getContextPath(), virtualWiki, wikiLink, tagText, this.style, tagTarget, true);
} else {
// return raw link of the form "/wiki/en/Special:Edit"
url = LinkUtil.buildTopicUrl(request.getContextPath(), virtualWiki, wikiLink);
}
this.pageContext.getOut().print(url);
} catch (DataAccessException e) {
logger.severe("Failure while building url " + url + " with value " + this.value + " and text " + this.text, e);
throw new JspException(e);
} catch (IOException e) {
logger.severe("Failure while building url " + url + " with value " + this.value + " and text " + this.text, e);
throw new JspException(e);
} finally {
this.queryParams = "";
}
return EVAL_PAGE;
}
/**
*
*/
protected void addQueryParam(String key, String value) throws JspException {
if (StringUtils.isBlank(key)) {
throw new JspException("linkParam key value cannot be empty");
}
this.queryParams = LinkUtil.appendQueryParam(this.queryParams, key, value);
}
/**
*
*/
private String buildLinkText() throws JspException {
String body = null;
String tagText = null;
if (this.getBodyContent() != null) {
body = this.getBodyContent().getString();
}
if (!StringUtils.isBlank(body) && !StringUtils.isBlank(this.text)) {
throw new JspException("Attribute 'text' and body content may not both be specified for link tag");
}
if (!StringUtils.isBlank(this.text)) {
tagText = this.text;
} else if (!StringUtils.isBlank(body)) {
tagText = body;
}
return tagText;
}
/**
*
*/
public String getStyle() {
return this.style;
}
/**
*
*/
public void setStyle(String style) {
this.style = style;
}
/**
*
*/
public String getTarget() {
return this.target;
}
/**
*
*/
public void setTarget(String target) {
this.target = target;
}
/**
*
*/
public String getText() {
return this.text;
}
/**
*
*/
public void setText(String text) {
this.text = text;
}
/**
*
*/
public String getValue() {
return this.value;
}
/**
*
*/
public void setValue(String value) {
this.value = value;
}
}