?? htmltag.java
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/*
* $Id: HtmlTag.java 54929 2004-10-16 16:38:42Z germuska $
*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.struts.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.taglib.TagUtils;
import org.apache.struts.util.MessageResources;
/**
* Renders an HTML <html> element with appropriate language attributes if
* there is a current Locale available in the user's session.
*
* @version $Rev: 54929 $ $Date: 2004-10-16 17:38:42 +0100 (Sat, 16 Oct 2004) $
*/
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?
* @deprecated This will be removed after Struts 1.2.
*/
protected boolean locale = false;
/**
* @deprecated This will be removed after Struts 1.2.
*/
public boolean getLocale() {
return (locale);
}
/**
* @deprecated This will be removed after Struts 1.2.
*/
public void setLocale(boolean locale) {
this.locale = locale;
}
/**
* Are we rendering an xhtml page?
*/
protected boolean xhtml = false;
/**
* Are we rendering a lang attribute?
* @since Struts 1.2
*/
protected boolean lang = false;
public boolean getXhtml() {
return this.xhtml;
}
public void setXhtml(boolean xhtml) {
this.xhtml = xhtml;
}
/**
* Returns true if the tag should render a lang attribute.
* @since Struts 1.2
*/
public boolean getLang() {
return this.lang;
}
/**
* Sets whether the tag should render a lang attribute.
* @since Struts 1.2
*/
public void setLang(boolean lang) {
this.lang = lang;
}
/**
* Process the start of this tag.
*
* @exception JspException if a JSP exception has occurred
*/
public int doStartTag() throws JspException {
TagUtils.getInstance().write(this.pageContext, this.renderHtmlStartElement());
return EVAL_BODY_INCLUDE;
}
/**
* Renders an <html> element with appropriate language attributes.
* @since Struts 1.2
*/
protected String renderHtmlStartElement() {
StringBuffer sb = new StringBuffer("<html");
String language = null;
String country = "";
if (this.locale) {
// provided for 1.1 backward compatibility, remove after 1.2
language = this.getCurrentLocale().getLanguage();
} else {
Locale currentLocale =
TagUtils.getInstance().getUserLocale(pageContext, Globals.LOCALE_KEY);
language = currentLocale.getLanguage();
country = currentLocale.getCountry();
}
boolean validLanguage = ((language != null) && (language.length() > 0));
boolean validCountry = country.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.lang || this.locale || this.xhtml) && validLanguage) {
sb.append(" lang=\"");
sb.append(language);
if (validCountry) {
sb.append("-");
sb.append(country);
}
sb.append("\"");
}
if (this.xhtml && validLanguage) {
sb.append(" xml:lang=\"");
sb.append(language);
if (validCountry) {
sb.append("-");
sb.append(country);
}
sb.append("\"");
}
sb.append(">");
return sb.toString();
}
/**
* Process the end of this tag.
*
* @exception JspException if a JSP exception has occurred
*/
public int doEndTag() throws JspException {
TagUtils.getInstance().write(pageContext, "</html>");
// Evaluate the remainder of this page
return (EVAL_PAGE);
}
/**
* Release any acquired resources.
*/
public void release() {
this.locale = false;
this.xhtml = false;
this.lang=false;
}
// ------------------------------------------------------ Protected Methods
/**
* 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
* @deprecated This will be removed after Struts 1.2.
*/
protected Locale getCurrentLocale() {
Locale userLocale = TagUtils.getInstance().getUserLocale(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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