📄 htmltag.java
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/*
* $Header: /sfroot/cvs/esimple/src/core/com/esimple/framework/web/taglib/html/HtmlTag.java,v 1.1.1.1 2004/09/08 06:38:17 lava Exp $
* $Revision: 1.1.1.1 $
* $Date: 2004/09/08 06:38:17 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Struts", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package com.esimple.framework.web.taglib.html;
import java.util.Locale;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.struts.Globals;
import org.apache.struts.util.MessageResources;
import org.apache.struts.util.RequestUtils;
import org.apache.struts.util.ResponseUtils;
/**
* Renders an HTML <html> element with appropriate language attributes if
* there is a current Locale available in the user's session.
*
* @author Craig R. McClanahan
* @author David Graham
* @version $Revision: 1.1.1.1 $ $Date: 2004/09/08 06:38:17 $
*/
public class HtmlTag extends TagSupport {
// ------------------------------------------------------------- Properties
/**
* The message resources for this package.
*/
protected static MessageResources messages =
MessageResources.getMessageResources(Constants.Package + ".LocalStrings");
/**
* Should we set the current Locale for this user if needed?
*/
protected boolean locale = false;
public boolean getLocale() {
return (locale);
}
public void setLocale(boolean locale) {
this.locale = locale;
}
/**
* Are we rendering an xhtml page?
*/
protected boolean xhtml = false;
public boolean getXhtml() {
return (xhtml);
}
public void setXhtml(boolean xhtml) {
this.xhtml = xhtml;
}
// --------------------------------------------------------- Public Methods
/**
* Process the start of this tag.
*
* @exception JspException if a JSP exception has occurred
*/
public int doStartTag() throws JspException {
StringBuffer sb = new StringBuffer("<html");
// Use the current Locale to set our language preferences
Locale currentLocale = this.getCurrentLocale();
String lang = currentLocale.getLanguage();
// Does the locale have a language?
boolean validLanguage = ((lang != null) && (lang.length() > 0));
if (this.xhtml) {
this.pageContext.setAttribute(Globals.XHTML_KEY, "true", PageContext.PAGE_SCOPE);
sb.append(" xmlns=\"http://www.w3.org/1999/xhtml\"");
}
if ((this.locale || this.xhtml) && validLanguage) {
sb.append(" lang=\"");
sb.append(lang);
sb.append("\"");
}
if (this.xhtml && validLanguage) {
sb.append(" xml:lang=\"");
sb.append(lang);
sb.append("\"");
}
sb.append(">");
// Write out the beginning tag for this page
ResponseUtils.write(this.pageContext, sb.toString());
// Evaluate the included content of this tag
return (EVAL_BODY_INCLUDE);
}
/**
* Process the end of this tag.
*
* @exception JspException if a JSP exception has occurred
*/
public int doEndTag() throws JspException {
ResponseUtils.write(pageContext, "</html>");
// Evaluate the remainder of this page
return (EVAL_PAGE);
}
/**
* Release any acquired resources.
*/
public void release() {
locale = false;
xhtml = false;
}
// ------------------------------------------------------ Protected Methods
/**
* Return the current Locale for this request, creating a new one if
* necessary. If there is no current Locale, and locale support is not
* requested, return <code>null</code>.
* @deprecated Use getCurrentLocale instead because it makes the display logic
* easier.
*/
protected Locale currentLocale() {
// Create a new session if necessary
HttpSession session = pageContext.getSession();
if (locale && (session == null)) {
session =
((HttpServletRequest) pageContext.getRequest()).getSession();
}
// Return any currently set Locale in our session
Locale current = (Locale) session.getAttribute(Globals.LOCALE_KEY);
if (current != null) {
return (current);
}
// Configure a new current Locale, if requested
if (!locale) {
return (null);
}
// If client doesn't specify locale then default for server will be returned
current = pageContext.getRequest().getLocale();
session.setAttribute(Globals.LOCALE_KEY, current);
return (current);
}
/**
* Return the current Locale for this request. If there is no locale in the session and
* the locale attribute is set to "true", this method will create a Locale based on the
* client's Accept-Language header or the server's default locale and store it in the
* session. This will always return a Locale and never null.
* @since Struts 1.1
*/
protected Locale getCurrentLocale() {
Locale userLocale = RequestUtils.retrieveUserLocale(pageContext, Globals.LOCALE_KEY);
// Store a new current Locale, if requested
if (this.locale) {
HttpSession session = ((HttpServletRequest) this.pageContext.getRequest()).getSession();
session.setAttribute(Globals.LOCALE_KEY, userLocale);
}
return userLocale;
}
}
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