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JSP taglib for the Dandelion-DataTables component.

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/*
 * [The "BSD licence"]
 * Copyright (c) 2013-2015 Dandelion
 * 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. Neither the name of Dandelion nor the names of its contributors 
 * may be used to endorse or promote products derived from this software 
 * without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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.
 */
package com.github.dandelion.datatables.jsp.i18n;

import java.util.Locale;

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

import com.github.dandelion.core.i18n.LocaleResolver;

/**
 * 
 * JSTL implementation of the {@link LocaleResolver}.
 * 
 * 
 * 
 * The locale is retrieved first from the request scope and then from the
 * session scope.
 * 
 * 
 * @author Thibault Duchateau
 * @since 0.9.0
 */
public class JstlLocaleResolver implements LocaleResolver {

   @Override
   public Locale resolveLocale(HttpServletRequest request) {

      Object locale = Config.get(request, Config.FMT_LOCALE);
      if (locale == null) {
         HttpSession session = request.getSession(false);
         if (session != null) {
            locale = Config.get(session, Config.FMT_LOCALE);
         }
      }

      return (locale instanceof Locale ? (Locale) locale : null);
   }
}