--- a/gnv-artifacts/src/main/java/de/intevation/gnv/raster/ExternalIndexConverter.java	Tue Apr 06 16:53:43 2010 +0000
+++ b/gnv-artifacts/src/main/java/de/intevation/gnv/raster/ExternalIndexConverter.java	Wed Apr 07 07:49:12 2010 +0000
@@ -3,6 +3,9 @@
 import org.apache.log4j.Logger;
 
 /**
+ * Converts the interal color index of a polygon to the external index
+ * defined by the corresponding palette entry.
+ * 
  * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
  */
 public class ExternalIndexConverter
@@ -11,15 +14,33 @@
     private static Logger log = Logger.getLogger(
         ExternalIndexConverter.class);
 
+    /**
+     * The palette where to find the color indices.
+     */
     protected Palette palette;
 
+    /**
+     * Default constructor.
+     */
     public ExternalIndexConverter() {
     }
 
+    /**
+     * Constrcutor to create an ExternalIndexConverter with
+     * a given palette.
+     * @param palette The palette where to find the color indices.
+     */
     public ExternalIndexConverter(Palette palette) {
         this.palette = palette;
     }
 
+    /**
+     * Maps the color index of a polygon to the external index
+     * defined by the corresponing palette entry.
+     * @param value The value to convert
+     * @return The mapped value or the original value if
+     * no corresponing palette entry was found.
+     */
     public Integer convert(Integer value) {
         if (value == null) {
             return value;