2 files changed, 221 insertions, 0 deletions
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/i18n/LanguageDecoratorMapper.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/i18n/LanguageDecoratorMapper.java
new file mode 100644
index 0000000..42e6b03
--- /dev/null
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/i18n/LanguageDecoratorMapper.java
@@ -0,0 +1,125 @@
+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 {
+   
+   
+   private String decoratorParameter = null;
+   
+   private static final 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 static Locale getLocale(HttpServletRequest request, String decoratorParameter) {
+      Locale locale = null;
+      HttpSession session = request.getSession();
+      
+      LOG.trace("Looking for locale in session (ID=" + session.getId() + ").");
+      locale = (Locale) session.getAttribute(LocaleParamFilter.LOCALE_SESSION_KEY);
+      if (locale == null) {
+         LOG.debug("Unable to find locale in session. Trying to create 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);
+            LOG.trace("Setting language to " + locale.getDisplayLanguage() + ".");
+            session.setAttribute(LocaleParamFilter.LOCALE_SESSION_KEY, locale);
+         }
+      } else {
+         LOG.trace("Locale found: " + locale);
+      }
+
+      return locale;
+   }
+
+   public Decorator getDecorator(HttpServletRequest request, Page page) {
+      LOG.trace("SiteMesh language resource decorator mapper invoked.");
+      
+      try {
+         Decorator result = null;
+         final Decorator d = super.getDecorator(request, page);
+         Locale locale = getLocale(request, this.decoratorParameter);
+         
+         String path;
+         if (locale != null) {
+            path = modifyPath(d.getPage(), locale.getLanguage());
+         } else {
+            path = d.getPage();
+         }
+
+         File decFile = new File(config.getServletContext().getRealPath(path));
+         
+         LOG.trace("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.trace("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.trace("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/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/i18n/LocaleParamFilter.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/i18n/LocaleParamFilter.java
new file mode 100644
index 0000000..598b23b
--- /dev/null
+++ b/pdf-as-web/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 {
+   }
+
+}