001: /*
002: * Copyright 2002-2005 the original author or authors.
003: *
004: * Licensed under the Apache License, Version 2.0 (the "License");
005: * you may not use this file except in compliance with the License.
006: * You may obtain a copy of the License at
007: *
008: * http://www.apache.org/licenses/LICENSE-2.0
009: *
010: * Unless required by applicable law or agreed to in writing, software
011: * distributed under the License is distributed on an "AS IS" BASIS,
012: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013: * See the License for the specific language governing permissions and
014: * limitations under the License.
015: */
016:
017: package org.springframework.web.servlet.support;
018:
019: import java.util.Locale;
020: import java.util.ResourceBundle;
021:
022: import javax.servlet.ServletContext;
023: import javax.servlet.http.HttpServletRequest;
024: import javax.servlet.jsp.jstl.core.Config;
025: import javax.servlet.jsp.jstl.fmt.LocalizationContext;
026:
027: import org.springframework.context.MessageSource;
028: import org.springframework.context.support.MessageSourceResourceBundle;
029: import org.springframework.context.support.ResourceBundleMessageSource;
030:
031: /**
032: * Helper class for preparing JSTL views,
033: * in particular for exposing a JSTL localization context.
034: *
035: * @author Juergen Hoeller
036: * @since 20.08.2003
037: */
038: public abstract class JstlUtils {
039:
040: public static final String REQUEST_SCOPE_SUFFIX = ".request";
041:
042: /**
043: * Checks JSTL's "javax.servlet.jsp.jstl.fmt.localizationContext"
044: * context-param and creates a corresponding child message source,
045: * with the provided Spring-defined MessageSource as parent.
046: * @param servletContext the ServletContext we're running in
047: * (to check JSTL-related context-params in web.xml)
048: * @param messageSource the MessageSource to expose, typically
049: * the ApplicationContext of the current DispatcherServlet
050: * @return the MessageSource to expose to JSTL; first checking the
051: * JSTL-defined bundle, then the Spring-defined MessageSource
052: * @see org.springframework.context.ApplicationContext
053: */
054: public static MessageSource getJstlAwareMessageSource(
055: ServletContext servletContext, MessageSource messageSource) {
056:
057: String jstlInitParam = servletContext
058: .getInitParameter(Config.FMT_LOCALIZATION_CONTEXT);
059: if (jstlInitParam != null) {
060: // Create a ResourceBundleMessageSource for the specified resource bundle
061: // basename in the JSTL context-param in web.xml, wiring it with the given
062: // Spring-defined MessageSource as parent.
063: ResourceBundleMessageSource jstlBundleWrapper = new ResourceBundleMessageSource();
064: jstlBundleWrapper.setBasename(jstlInitParam);
065: jstlBundleWrapper.setParentMessageSource(messageSource);
066: return jstlBundleWrapper;
067: }
068: return messageSource;
069: }
070:
071: /**
072: * Exposes JSTL-specific request attributes specifying locale
073: * and resource bundle for JSTL's formatting and message tags,
074: * using Spring's locale and message source.
075: * @param request current HTTP request
076: * @param messageSource the MessageSource to expose,
077: * typically the current application context
078: */
079: public static void exposeLocalizationContext(
080: HttpServletRequest request, MessageSource messageSource) {
081:
082: // Add JSTL locale and LocalizationContext request attributes.
083: Locale jstlLocale = RequestContextUtils.getLocale(request);
084: ResourceBundle bundle = new MessageSourceResourceBundle(
085: messageSource, jstlLocale);
086: LocalizationContext jstlContext = new LocalizationContext(
087: bundle, jstlLocale);
088:
089: // for JSTL implementations that stick to the config names (e.g. Resin's)
090: request.setAttribute(Config.FMT_LOCALIZATION_CONTEXT,
091: jstlContext);
092: request.setAttribute(Config.FMT_LOCALE, jstlLocale);
093:
094: // for JSTL implementations that append the scope to the config names (e.g. Jakarta's)
095: request.setAttribute(Config.FMT_LOCALIZATION_CONTEXT
096: + REQUEST_SCOPE_SUFFIX, jstlContext);
097: request.setAttribute(Config.FMT_LOCALE + REQUEST_SCOPE_SUFFIX,
098: jstlLocale);
099: }
100:
101: }
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