Preparation for multilingual support for web application.

git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@312 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c

2 files changed, 170 insertions, 0 deletions

diff --git a/src/main/java/at/gv/egiz/pdfas/web/i18n/LanguageDecoratorMapper.java b/src/main/java/at/gv/egiz/pdfas/web/i18n/LanguageDecoratorMapper.java
new file mode 100644
index 0000000..1db7e3b
--- /dev/null
+++ b/src/main/java/at/gv/egiz/pdfas/web/i18n/LanguageDecoratorMapper.java
@@ -0,0 +1,111 @@
+package at.gv.egiz.pdfas.web.i18n;

+

+import java.io.File;

+import java.util.Locale;

+import java.util.Properties;

+

+import javax.servlet.http.HttpServletRequest;

+import javax.servlet.http.HttpSession;

+

+import org.apache.log4j.Logger;

+

+import com.opensymphony.module.sitemesh.Config;

+import com.opensymphony.module.sitemesh.Decorator;

+import com.opensymphony.module.sitemesh.DecoratorMapper;

+import com.opensymphony.module.sitemesh.Page;

+import com.opensymphony.module.sitemesh.mapper.AbstractDecoratorMapper;

+import com.opensymphony.module.sitemesh.mapper.DefaultDecorator;

+

+public class LanguageDecoratorMapper extends AbstractDecoratorMapper {

+   

+   public static final String LOCALE_SESSION_KEY = "at.gv.egiz.pdfas.web.i18n:currentLocale";

+   

+   private Logger log = Logger.getLogger(LanguageDecoratorMapper.class);

+

+   public void init(Config config, Properties properties, DecoratorMapper parent) throws InstantiationException {

+      super.init(config, properties, parent);

+   }

+   

+   public static Object getFirstNotNull(Object[] objects) {

+      if (objects == null) {

+         return null;

+      }

+      for (int i = 0; i < objects.length; i++) {

+         if (objects[i] != null) {

+            return objects[i];

+         }

+      }

+      return null;

+   }

+

+   public Decorator getDecorator(HttpServletRequest request, Page page) {

+      try {

+         Decorator result = null;

+         final Decorator d = super.getDecorator(request, page);

+         HttpSession session = request.getSession();

+         log.trace("Looking for Locale in session.");

+         Locale locale = (Locale) session.getAttribute(LOCALE_SESSION_KEY);

+         if (locale == null) {

+            log.debug("Unable to find Locale in session. Creating new Locale based on Accept-Language header entry.");

+            String acceptLanguage = request.getHeader("Accept-Language");

+            if (acceptLanguage != null) {

+               log.trace("Accept-Language header entry: " + acceptLanguage);

+            } else {

+               log.trace("No header entry found.");

+            }

+            if (acceptLanguage != null && acceptLanguage.length() >= 2) {

+               locale = new Locale(acceptLanguage.substring(0, 2));

+               log.debug("New Locale created: " + locale);

+            }

+         } else {

+            log.debug("Locale found: " + locale);

+         }

+         String path;

+         if (locale != null) {

+            path = modifyPath(d.getPage(), locale.getLanguage());

+         } else {

+            path = d.getPage();

+         }

+

+         File decFile = new File(config.getServletContext().getRealPath(path));

+         

+         log.debug("Looking for decorator \"" + path + "\".");

+         if (decFile.isFile()) {

+            result = new DefaultDecorator(d.getName(), path, null) {

+               public String getInitParameter(String paramName) {

+                  return d.getInitParameter(paramName);

+               }

+            };

+         }

+

+         if (result != null) {

+            log.debug("Decorator found (\"" + result.getName() + "\", \"" + getFirstNotNull(new Object[] { result.getURIPath(), result.getPage(), "<n/a>"}) + "\").");

+            return result;

+         } else {

+            log.trace("No decorator found. Delegating to super class.");

+            result = super.getDecorator(request, page);

+            if (result != null) {

+               log.debug("Super class returned decorator (\"" + result.getName() + "\", \"" + getFirstNotNull(new Object[] { result.getURIPath(), result.getPage(), "<n/a>"}) + "\").");

+            } else {

+               log.trace("Super class did not return a decorator.");

+            }

+            return result;

+         }

+      } catch (NullPointerException e) {

+         return super.getDecorator(request, page);

+      }

+   }

+

+   private static String modifyPath(String path, String ext) {

+      if (ext == null || ext.length() == 0) {

+         return path;

+      }

+      int dot = path.lastIndexOf('.');

+      if (dot > -1) {

+         return path.substring(0, dot) + '-' + ext + path.substring(dot);

+      } else {

+         return path + '-' + ext;

+      }

+   }

+

+}

diff --git a/src/main/java/at/gv/egiz/pdfas/web/i18n/SetLanguageServlet.java b/src/main/java/at/gv/egiz/pdfas/web/i18n/SetLanguageServlet.java
new file mode 100644
index 0000000..582f765
--- /dev/null
+++ b/src/main/java/at/gv/egiz/pdfas/web/i18n/SetLanguageServlet.java
@@ -0,0 +1,59 @@
+package at.gv.egiz.pdfas.web.i18n;

+

+import java.io.IOException;

+import java.util.Locale;

+

+import javax.servlet.RequestDispatcher;

+import javax.servlet.ServletException;

+import javax.servlet.http.HttpServlet;

+import javax.servlet.http.HttpServletRequest;

+import javax.servlet.http.HttpServletResponse;

+import javax.servlet.http.HttpSession;

+

+import org.apache.commons.lang.ArrayUtils;

+import org.apache.commons.lang.StringUtils;

+import org.apache.log4j.Logger;

+

+public class SetLanguageServlet extends HttpServlet {

+   

+   private static final long serialVersionUID = 1L;

+   

+   public static final String LANGUAGE_PARAMETER = "code";

+   private Logger log = Logger.getLogger(LanguageDecoratorMapper.class);

+

+   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

+      this.doPost(request, response);

+   }

+

+   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

+      

+      HttpSession session = request.getSession();

+      

+      // check manual language override (should be two-letter ISO-639 code)

+      Locale currentManualSetLanguage = (Locale) session.getAttribute(LanguageDecoratorMapper.LOCALE_SESSION_KEY);

+      String language = request.getParameter(LANGUAGE_PARAMETER);

+      if (!StringUtils.isEmpty(language)) {

+         String code = language.trim().toLowerCase();

+         if (!ArrayUtils.contains(Locale.getISOLanguages(), code)) {

+            log.error("Manually set language code \"" + code + "\" is not a valid ISO 639 language. Do not switch language.");

+         } else {

+            currentManualSetLanguage = new Locale(code);

+            log.info("Switching language to " + currentManualSetLanguage.getDisplayLanguage() + ".");

+            session.setAttribute(LanguageDecoratorMapper.LOCALE_SESSION_KEY, currentManualSetLanguage);

+         }

+      }

+

+//      if (currentManualSetLanguage != null) {

+//         log.info("Forcing language " + currentManualSetLanguage.getDisplayLanguage() + ".");

+//         super.getServletContext().setAttribute(LanguageDecoratorMapper.LOCALE_SESSION_KEY, currentManualSetLanguage);

+//      }

+      

+//      response.sendRedirect(response.encodeRedirectURL(request.getContextPath() + "/"));

+      RequestDispatcher rd = request.getRequestDispatcher("/");

+      rd.forward(request, response);

+      

+   }

+   

+   

+

+}