1 files changed, 111 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;
+      }
+   }
+
+}