1 files changed, 96 insertions, 0 deletions
diff --git a/src/main/java/at/gv/egiz/pdfas/web/i18n/LocaleParamFilter.java b/src/main/java/at/gv/egiz/pdfas/web/i18n/LocaleParamFilter.java
new file mode 100644
index 0000000..598b23b
--- /dev/null
+++ b/src/main/java/at/gv/egiz/pdfas/web/i18n/LocaleParamFilter.java
@@ -0,0 +1,96 @@
+package at.gv.egiz.pdfas.web.i18n;
+
+import java.io.IOException;
+import java.util.Locale;
+import java.util.StringTokenizer;
+
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpSession;
+
+import org.apache.commons.lang.LocaleUtils;
+import org.apache.commons.lang.StringUtils;
+import org.apache.log4j.Logger;
+
+public class LocaleParamFilter implements Filter {
+
+   private static final Logger LOG = Logger.getLogger(LocaleParamFilter.class);
+   public static final String LOCALE_SESSION_KEY = "at.gv.egiz.pdfas.web.i18n:currentLocale";
+   public static final String LOCALE_PARAM_KEY = "locale";
+   
+   public void destroy() {
+   }
+
+   public static String normalizeLocaleString(String localeString) {
+      if (localeString == null) {
+         return null;
+      }
+      int jsessionIdIndex = localeString.toLowerCase().indexOf(";jsessionid");
+      if (jsessionIdIndex != -1) {
+         localeString = localeString.substring(0, jsessionIdIndex);
+      }
+      StringTokenizer tokenizer = new StringTokenizer(localeString, "_", false);
+      StringBuffer buffer = new StringBuffer();
+      int index = 0;
+      while (tokenizer.hasMoreTokens()) {
+         String token = tokenizer.nextToken();
+         switch (++index) {
+         case 1:
+            buffer.append(token.toLowerCase());
+            break;
+         case 2:
+            buffer.append(token.toUpperCase());
+            break;
+         default:
+            buffer.append(token);
+            break;
+         }
+         if (tokenizer.hasMoreTokens()) {
+            buffer.append("_");
+         }
+      }
+      return buffer.toString();
+   }
+   
+   public static Locale getLocale(HttpServletRequest request) {
+      Locale locale = null;
+      HttpSession session = request.getSession();
+      
+      LOG.trace("Looking for locale parameter \"" + LOCALE_PARAM_KEY + "\".");
+      String language = request.getParameter(LOCALE_PARAM_KEY);
+      if (!StringUtils.isEmpty(language)) {
+         LOG.debug("Locale parameter \"" + language + "\" found.");
+         String code = normalizeLocaleString(language.trim());
+         LOG.debug("Normalizing locale -> " + code);
+         try {
+            locale = LocaleUtils.toLocale(code);
+            LOG.info("Setting locale flag in session (ID=" + session.getId() + ") to \"" + locale.toString() + "\".");
+            session.setAttribute(LOCALE_SESSION_KEY, locale);
+         } catch (IllegalArgumentException e) {
+            LOG.error("Locale \"" + code + "\" is not valid. Flag will not be set.");
+         }
+      } else {
+         LOG.trace("No locale parameter found.");
+      }
+      
+      return locale;
+   }
+
+   public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
+      HttpServletRequest request = (HttpServletRequest) servletRequest;
+      
+      LOG.trace("LocaleParamFilter invoked.");
+      getLocale(request);
+      
+      filterChain.doFilter(servletRequest, servletResponse);
+   }
+
+   public void init(FilterConfig filterConfig) throws ServletException {
+   }
+
+}