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Spring Framework example source code file (JspAwareRequestContext.java)

This example Spring Framework source code file (JspAwareRequestContext.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

http, http, httpservletrequest, illegalargumentexception, jsp, jspawarerequestcontext, jspawarerequestcontext, jstlpagelocaleresolver, locale, locale, map, map, object, pagecontext, pagecontext, request, requestcontext, response, servlet, util

The Spring Framework JspAwareRequestContext.java source code

/*
 * Copyright 2002-2007 the original author or authors.
 *
 * 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.springframework.web.servlet.support;

import java.util.Locale;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.jstl.core.Config;

import org.springframework.util.ClassUtils;

/**
 * JSP-aware (and JSTL-aware) subclass of RequestContext, allowing for
 * population of the context from a <code>javax.servlet.jsp.PageContext.
 *
 * <p>This context will detect a JSTL locale attribute in page/request/session/application
 * scope, in addition to the fallback locale strategy provided by the base class.
 *
 * @author Juergen Hoeller
 * @since 1.1.4
 * @see #getFallbackLocale
 */
public class JspAwareRequestContext extends RequestContext {

	private PageContext pageContext;


	/**
	 * Create a new JspAwareRequestContext for the given page context,
	 * using the request attributes for Errors retrieval.
	 * @param pageContext current JSP page context
	 */
	public JspAwareRequestContext(PageContext pageContext) {
		initContext(pageContext, null);
	}

	/**
	 * Create a new JspAwareRequestContext for the given page context,
	 * using the given model attributes for Errors retrieval.
	 * @param pageContext current JSP page context
	 * @param model the model attributes for the current view
	 * (can be <code>null, using the request attributes for Errors retrieval)
	 */
	public JspAwareRequestContext(PageContext pageContext, Map model) {
		initContext(pageContext, model);
	}

	/**
	 * Initialize this context with the given page context,
	 * using the given model attributes for Errors retrieval.
	 * @param pageContext current JSP page context
	 * @param model the model attributes for the current view
	 * (can be <code>null, using the request attributes for Errors retrieval)
	 */
	protected void initContext(PageContext pageContext, Map model) {
		if (!(pageContext.getRequest() instanceof HttpServletRequest)) {
			throw new IllegalArgumentException("RequestContext only supports HTTP requests");
		}
		this.pageContext = pageContext;
		initContext((HttpServletRequest) pageContext.getRequest(), pageContext.getServletContext(), model);
	}


	/**
	 * Return the underlying PageContext.
	 * Only intended for cooperating classes in this package.
	 */
	protected final PageContext getPageContext() {
		return this.pageContext;
	}

	/**
	 * This implementation checks for a JSTL locale attribute
	 * in page, request, session or application scope; if not found,
	 * returns the <code>HttpServletRequest.getLocale().
	 */
	protected Locale getFallbackLocale() {
		if (jstlPresent) {
			Locale locale = JstlPageLocaleResolver.getJstlLocale(getPageContext());
			if (locale != null) {
				return locale;
			}
		}
		return getRequest().getLocale();
	}


	/**
	 * Inner class that isolates the JSTL dependency.
	 * Just called to resolve the fallback locale if the JSTL API is present.
	 */
	private static class JstlPageLocaleResolver {

		public static Locale getJstlLocale(PageContext pageContext) {
			Object localeObject = Config.find(pageContext, Config.FMT_LOCALE);
			return (localeObject instanceof Locale ? (Locale) localeObject : null);
		}
	}

}

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