From 9662ac90b6aa84bc54543d3c8670ba6c8e42bbac Mon Sep 17 00:00:00 2001
From: clemenso <clemenso@8a26b1a7-26f0-462f-b9ef-d0e30c41f5a4>
Date: Thu, 13 Nov 2008 18:24:57 +0000
Subject: FRAME HashDataDisplay FRAME Help

git-svn-id: https://joinup.ec.europa.eu/svn/mocca/trunk@165 8a26b1a7-26f0-462f-b9ef-d0e30c41f5a4
---
 .../at/gv/egiz/bku/gui/AbstractHelpListener.java   | 41 +++++++++++++++-------
 1 file changed, 28 insertions(+), 13 deletions(-)

(limited to 'BKUCommonGUI/src/main/java/at/gv/egiz/bku/gui/AbstractHelpListener.java')

diff --git a/BKUCommonGUI/src/main/java/at/gv/egiz/bku/gui/AbstractHelpListener.java b/BKUCommonGUI/src/main/java/at/gv/egiz/bku/gui/AbstractHelpListener.java
index a249a376..f46f5227 100644
--- a/BKUCommonGUI/src/main/java/at/gv/egiz/bku/gui/AbstractHelpListener.java
+++ b/BKUCommonGUI/src/main/java/at/gv/egiz/bku/gui/AbstractHelpListener.java
@@ -14,7 +14,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
 package at.gv.egiz.bku.gui;
 
 import java.awt.event.ActionEvent;
@@ -22,19 +21,24 @@ import java.awt.event.ActionListener;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.Locale;
+import java.util.ResourceBundle;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
 /**
- *
+ * Implement the showDocument(URL) method to provide an actual HelpListener.
+ * This class does not keep a GUI reference and subclasses should not interfere with the GUI.
+ * Therefore, any errors occurring in showDocument() should be handled/displayed within
+ * showDocument() and exceptions thrown from showDocument() are logged, not displayed in the GUI.
+ * 
  * @author Clemens Orthacker <clemens.orthacker@iaik.tugraz.at>
  */
 public abstract class AbstractHelpListener implements ActionListener {
 
   protected final static Log log = LogFactory.getLog(AbstractHelpListener.class);
-//  protected String helpURLBase;
   protected URL baseURL;
   protected Locale locale;
+  protected ResourceBundle messages;
 
   public AbstractHelpListener(URL baseURL, Locale locale) {
     if (baseURL == null || "".equals(baseURL)) {
@@ -42,6 +46,11 @@ public abstract class AbstractHelpListener implements ActionListener {
     }
     this.baseURL = baseURL;
     this.locale = locale;
+    if (locale != null) {
+      messages = ResourceBundle.getBundle(BKUGUIFacade.MESSAGES_BUNDLE, locale);
+    } else {
+      messages = ResourceBundle.getBundle(BKUGUIFacade.MESSAGES_BUNDLE);
+    }
   }
 
   @Override
@@ -49,30 +58,36 @@ public abstract class AbstractHelpListener implements ActionListener {
     log.debug("received help action: " + e.getActionCommand());
     URL helpURL = constructHelpURL(baseURL, e.getActionCommand());
     try {
-      showDocument(helpURL);
+      showDocument(helpURL, e.getActionCommand());
     } catch (Exception ex) {
       log.error("could not display help document " + helpURL + ": " + ex.getMessage());
     }
   }
-  
-  private URL constructHelpURL(URL baseURL, String helpItem) {
+
+  private URL constructHelpURL(URL baseURL, String helpTopic) {
     URL helpURL = baseURL;
     log.trace("constructing help URL: " + helpURL);
     try {
       if (locale != null) {
         helpURL = new URL(helpURL, locale.toString() + "/");
         log.trace("constructing help URL: " + helpURL);
-      } 
-      if (helpItem != null && !"".equals(helpItem)) {
-        helpURL = new URL(helpURL, helpItem + ".html");
+      }
+      if (helpTopic != null && !"".equals(helpTopic)) {
+        helpURL = new URL(helpURL, helpTopic + ".html");
         log.trace("constructing help URL: " + helpURL);
       }
     } catch (MalformedURLException ex) {
-      log.error("Failed to construct help URL for help item " + helpItem + ": " + ex.getMessage());
+      log.error("Failed to construct help URL for help item " + helpTopic + ": " + ex.getMessage());
     }
     return helpURL;
   }
-  
-  public abstract void showDocument(URL helpDocument) throws Exception;
-  
+
+  /**
+   * Errors from HelpListeners should not (are not) displayed in the applet, 
+   * but should rather be in the HelpListener specific way.
+   * Therefore, implementations SHOULD NOT throw exceptions (these are only logged).
+   * @param helpDocument
+   * @throws java.lang.Exception
+   */
+  public abstract void showDocument(URL helpDocument, String helpTopic) throws Exception;
 }
-- 
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