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/*
* Copyright 2008 biaoping.yin
*
* 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.frameworkset.web.servlet.support;
import java.util.Locale;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext;
import org.frameworkset.spi.support.LocaleContext;
import org.frameworkset.spi.support.MessageSource;
import org.frameworkset.spi.support.SimpleLocaleContext;
import org.frameworkset.web.servlet.DispatchServlet;
import org.frameworkset.web.servlet.LocaleResolver;
import org.frameworkset.web.servlet.ThemeResolver;
import org.frameworkset.web.servlet.context.WebApplicationContext;
import org.frameworkset.web.ui.ThemeSource;
import org.frameworkset.web.ui.context.Theme;
/**
* Title: RequestContextUtils.java
* Description:
* bboss workgroup
* Copyright (c) 2008
* @Date 2010-9-24
* @author biaoping.yin
* @version 1.0
*/
public abstract class RequestContextUtils {
/** {@link javax.servlet.jsp.PageContext} attribute for page-level
* {@link RequestContext} instance.
* */
public static final String REQUEST_CONTEXT_PAGE_ATTRIBUTE =
"org.frameworkset.web.servlet.tags.REQUEST_CONTEXT";
public static final String LOCALE_CONTEXT_REQUEST_ATTRIBUTE =
"org.frameworkset.web.servlet.tags.LocalContext";
/**
* Look for the WebApplicationContext associated with the DispatchServlet
* that has initiated request processing.
* @param request current HTTP request
* @return the request-specific web application context
* @throws IllegalStateException if no servlet-specific context has been found
*/
public static WebApplicationContext getWebApplicationContext(ServletRequest request)
throws IllegalStateException {
return getWebApplicationContext(request, null);
}
/**
* Look for the WebApplicationContext associated with the DispatchServlet
* that has initiated request processing, and for the global context if none
* was found associated with the current request. This method is useful to
* allow components outside the framework, such as JSP tag handlers,
* to access the most specific application context available.
* @param request current HTTP request
* @param servletContext current servlet context
* @return the request-specific WebApplicationContext, or the global one
* if no request-specific context has been found
* @throws IllegalStateException if neither a servlet-specific nor a
* global context has been found
*/
public static WebApplicationContext getWebApplicationContext(
ServletRequest request, ServletContext servletContext) throws IllegalStateException {
WebApplicationContext webApplicationContext = (WebApplicationContext) request.getAttribute(
DispatchServlet.WEB_APPLICATION_CONTEXT_ATTRIBUTE);
if (webApplicationContext == null) {
if (servletContext == null) {
throw new IllegalStateException("No WebApplicationContext found: not in a DispatchServlet request?");
}
webApplicationContext = WebApplicationContextUtils.getWebApplicationContext(servletContext);
if (webApplicationContext == null) {
throw new IllegalStateException("No WebApplicationContext found: no ContextLoaderListener registered?");
}
}
return webApplicationContext;
}
/**
* Return the LocaleResolver that has been bound to the request by the
* DispatchServlet.
* @param request current HTTP request
* @return the current LocaleResolver, or null if not found
*/
public static LocaleResolver getLocaleResolver(HttpServletRequest request) {
LocaleResolver localeResolver = (LocaleResolver) request.getAttribute(DispatchServlet.LOCALE_RESOLVER_ATTRIBUTE);
if(localeResolver == null)
{
localeResolver = DispatchServlet.getLocaleResolver(DispatchServlet.webApplicationContext);
request.setAttribute(DispatchServlet.LOCALE_RESOLVER_ATTRIBUTE,localeResolver);
}
return localeResolver;
}
/**
* Retrieves the current locale from the given request,
* using the LocaleResolver bound to the request by the DispatchServlet
* (if available), falling back to the request's accept-header Locale.
* @param request current HTTP request
* @return the current locale, either from the LocaleResolver or from
* the plain request
* @see #getLocaleResolver
* @see javax.servlet.http.HttpServletRequest#getLocale()
*/
public static Locale getLocale(HttpServletRequest request) {
// LocaleResolver localeResolver = getLocaleResolver(request);
// if (localeResolver != null) {
// return localeResolver.resolveLocale(request);
// }
// else {
// return request.getLocale();
// }
return getRequestContextLocal(request);
}
/**
* Retrieves the current locale from the given request,
* using the LocaleResolver bound to the request by the DispatchServlet
* (if available), falling back to the request's accept-header Locale.
* @param request current HTTP request
* @return the current locale, either from the LocaleResolver or from
* the plain request
* @see #getLocaleResolver
* @see javax.servlet.http.HttpServletRequest#getLocale()
*/
public static String getLocaleCode(HttpServletRequest request) {
// LocaleResolver localeResolver = getLocaleResolver(request);
// if (localeResolver != null) {
// return localeResolver.resolveLocaleCode(request);
// }
// else {
// return String.valueOf(request.getLocale());
// }
Locale local = getLocalContext(request).getLocale();
return local.toString();
}
/**
* Return the ThemeResolver that has been bound to the request by the
* DispatchServlet.
* @param request current HTTP request
* @return the current ThemeResolver, or null if not found
*/
public static ThemeResolver getThemeResolver(HttpServletRequest request) {
return (ThemeResolver) request.getAttribute(DispatchServlet.THEME_RESOLVER_ATTRIBUTE);
}
/**
* Return the ThemeSource that has been bound to the request by the
* DispatchServlet.
* @param request current HTTP request
* @return the current ThemeSource
*/
public static ThemeSource getThemeSource(HttpServletRequest request) {
return (ThemeSource) request.getAttribute(DispatchServlet.THEME_SOURCE_ATTRIBUTE);
}
/**
* Retrieves the current theme from the given request, using the ThemeResolver
* and ThemeSource bound to the request by the DispatchServlet.
* @param request current HTTP request
* @return the current theme, or null if not found
* @see #getThemeResolver
*/
public static Theme getTheme(HttpServletRequest request) {
ThemeResolver themeResolver = getThemeResolver(request);
ThemeSource themeSource = getThemeSource(request);
if (themeResolver != null && themeSource != null) {
String themeName = themeResolver.resolveThemeName(request);
return themeSource.getTheme(themeName);
}
else {
return null;
}
}
public static Locale getRequestContextLocal(PageContext pageContext)
{
RequestContext requestContext = (RequestContext) pageContext.getAttribute(REQUEST_CONTEXT_PAGE_ATTRIBUTE);
if (requestContext == null) {
requestContext = new JspAwareRequestContext(pageContext);
pageContext.setAttribute(REQUEST_CONTEXT_PAGE_ATTRIBUTE, requestContext);
}
return requestContext.getLocale();
}
public static String getRequestContextLocalName(PageContext pageContext)
{
RequestContext requestContext = (RequestContext) pageContext.getAttribute(REQUEST_CONTEXT_PAGE_ATTRIBUTE);
if (requestContext == null) {
requestContext = new JspAwareRequestContext(pageContext);
pageContext.setAttribute(REQUEST_CONTEXT_PAGE_ATTRIBUTE, requestContext);
}
return requestContext.getLocaleName();
}
public static RequestContext getRequestContext(PageContext pageContext)
{
RequestContext requestContext = (RequestContext) pageContext.getAttribute(REQUEST_CONTEXT_PAGE_ATTRIBUTE);
if (requestContext == null) {
requestContext = new JspAwareRequestContext(pageContext);
pageContext.setAttribute(REQUEST_CONTEXT_PAGE_ATTRIBUTE, requestContext);
}
return requestContext;
}
public static Locale getRequestContextLocal(HttpServletRequest request)
{
LocaleContext lc = getLocalContext( request);
return lc.getLocale();
}
/**
* 根据code从mvc的国际化配置文件中获取对应语言的代码值
* @param code
* @param request
* @return
*/
public static String getI18nMessage(String code,HttpServletRequest request)
{
return getI18nMessage(code,(String )null,request);
}
/**
* 根据code从mvc的国际化配置文件中获取对应语言的代码值,如果代码值为空，则返回defaultMessage
* @param code
* @param defaultMessage
* @param request
* @return
*/
public static String getI18nMessage(String code,String defaultMessage,HttpServletRequest request)
{
return getI18nMessage(code,(Object[])null,defaultMessage,request);
}
/**
* 根据code从mvc的国际化配置文件中获取对应语言的代码值,如果代码值为空，则返回defaultMessage
* @param code
* @param defaultMessage
* @param request
* @return
*/
public static String getI18nMessage(String code,String defaultMessage)
{
return getI18nMessage(code,(Object[])null,defaultMessage,null);
}
/**
* 根据code从mvc的国际化配置文件中获取对应语言的代码值,如果代码值为空，则返回defaultMessage
* @param code
* @param defaultMessage
* @param request
* @return
*/
public static String getI18nMessage(String code)
{
return getI18nMessage(code,(Object[])null,(String)null,null);
}
/**
* 根据code从mvc的国际化配置文件中获取对应语言的代码值,并且将数组args中的每个元素替换到代码值中位置占位符，例如{0}会用数组的第一个元素替换
* @param code
* @param args
* @param request
* @return
*/
public static String getI18nMessage(String code,Object[] args,HttpServletRequest request)
{
return getI18nMessage(code,args,(String)null,request);
}
public static String getI18nMessage(String code,Object[] args)
{
return getI18nMessage( code, args,(String )null);
}
public static String getI18nMessage(String code,Object[] args,String defaultMessage)
{
return getI18nMessage( code,args, defaultMessage,null);
}
/**
* 根据code从mvc的国际化配置文件中获取对应语言的代码值,如果代码值为空，则返回defaultMessage,并且将数组args中的每个元素替换到代码值中位置占位符，例如{0}会用数组的第一个元素替换
* @param code
* @param args
* @param defaultMessage
* @param request
* @return
*/
public static String getI18nMessage(String code,Object[] args,String defaultMessage,HttpServletRequest request)
{
if(request != null)
{
Locale locale = RequestContextUtils.getRequestContextLocal(request);
MessageSource messageSource = WebApplicationContextUtils.getWebApplicationContext();
if(messageSource != null)
return messageSource.getMessage(code, args, defaultMessage, locale);
else
{
if(defaultMessage != null)
return defaultMessage;
else
return code;
}
}
else
{
Locale locale = DispatchServlet.getLocaleResolver().resolveLocale(null);
MessageSource messageSource = WebApplicationContextUtils.getWebApplicationContext();
if(messageSource != null)
return messageSource.getMessage(code, args, defaultMessage, locale);
else
{
if(defaultMessage != null)
return defaultMessage;
else
return code;
}
}
}
private static LocaleContext defaultLocalContext = new SimpleLocaleContext(Locale.getDefault(),Locale.getDefault().toString());
public static LocaleContext getLocalContext(HttpServletRequest request)
{
if(request != null)
{
LocaleContext lc = (LocaleContext)request.getAttribute(RequestContextUtils.LOCALE_CONTEXT_REQUEST_ATTRIBUTE);
if(lc == null)
{
LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
Locale locale = null;
if (localeResolver != null) {
// Try LocaleResolver (we're within a DispatcherServlet request).
locale = localeResolver.resolveLocale(request);
}
else {
// No LocaleResolver available -> try fallback.
locale = request.getLocale();
}
String localeName = locale.toString();
lc = new SimpleLocaleContext(locale,localeName);
request.setAttribute(RequestContextUtils.LOCALE_CONTEXT_REQUEST_ATTRIBUTE,lc);
}
return lc;
}
else
{
return defaultLocalContext;
}
}
public static String getRequestContextLocalName(HttpServletRequest request)
{
LocaleContext lc = getLocalContext( request);
return lc.getLocaleName();
}
public static void setLocale(HttpServletRequest request,
HttpServletResponse response, String locale) {
RequestContextUtils.getLocaleResolver(request).setLocale(request, response, locale);
}
public static void setLocale(HttpServletRequest request,
HttpServletResponse response, Locale locale) {
RequestContextUtils.getLocaleResolver(request).setLocale(request, response, locale);
}
}