javax.help.tagext.NavigatorsTag Maven / Gradle / Ivy
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The JavaHelp API provides a platform-independent help framework.
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/*
* @(#)NavigatorsTag.java 1.4 06/10/30
*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package javax.help.tagext;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import javax.servlet.ServletRequest;
import java.util.*;
import java.io.*;
import java.net.URL;
import java.net.MalformedURLException;
import javax.help.HelpBroker;
import javax.help.HelpSet;
import javax.help.Map;
import javax.help.Map.ID;
import javax.help.NavigatorView;
/**
* The JSP tag class for a Navigators
*
* @author Roger D. Brinkley
* @version 1.4 10/30/06
* @see javax.help.HelpSet.getNavigatorView()
* @see javax.help.NavigatorView
*/
public class NavigatorsTag extends BodyTagSupport {
private HelpBroker hb;
private HelpSet hs;
private String curNav = null;
private NavigatorView[] views;
private int i;
public void setHelpBroker(HelpBroker hb) {
this.hb = hb;
hs = hb.getHelpSet();
}
public void setCurrentNav(String nav) {
curNav = nav;
}
public void initialize() {
checkRequestParams();
initCurNav();
views = hs.getNavigatorViews();
}
public int doStartTag() {
initialize();
if(views.length > 0) {
i = 0;
setNavigatorAttributes(views[i++]);
return EVAL_BODY_TAG;
} else {
return SKIP_BODY;
}
}
private void checkRequestParams() {
ServletRequest request = pageContext.getRequest();
String nav = request.getParameter("nav");
if (nav != null) {
curNav = nav;
}
}
private void initCurNav() {
if (curNav != null) {
try {
hb.setCurrentView(curNav);
} catch (IllegalArgumentException e) {
// Ignore
}
} else {
curNav = hb.getCurrentView();
}
}
public int doAfterBody() throws JspException {
BodyContent body = getBodyContent();
try {
body.writeOut(getPreviousOut());
} catch (IOException e) {
throw new JspTagException("NavigatorsTag: " + e.getMessage());
}
// clear up so the next time the body content is empty
body.clearBody();
if (i < views.length) {
setNavigatorAttributes(views[i++]);
return EVAL_BODY_TAG;
} else {
return SKIP_BODY;
}
}
private void setNavigatorAttributes(NavigatorView view) {
pageContext.setAttribute("className", view.getClass().getName());
pageContext.setAttribute("name", view.getName());
pageContext.setAttribute("tip", view.getLabel());
String icon = getIconURL(view);
pageContext.setAttribute("iconURL", icon);
pageContext.setAttribute("isCurrentNav", new Boolean(curNav.compareTo(view.getName()) == 0));
}
/**
* return the icon URL in String form for a given TOCItem
*
* returns empty String if no content exists.
*/
private String getIconURL(NavigatorView view) {
URL url = null;
ID id = view.getImageID();
if (id != null) {
HelpSet hs = id.hs;
Map map = hs.getLocalMap();
try {
url = map.getURLFromID(id);
} catch (MalformedURLException e) {
// just ignore
}
}
if (url == null) {
return "";
}
return url.toExternalForm();
}
}