added iterable implementation in KeyList

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@7891 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/net/yacy/cora/storage/KeyList.java

@@ -31,6 +31,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.RandomAccessFile;
+import java.util.Iterator;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.zip.GZIPInputStream;
@@ -43,7 +44,7 @@ import net.yacy.cora.document.UTF8;
  * which is done by extending the file with just another line.
  * When is key list file is initialized, all lines are read and pushed into a java set
  */
-public class KeyList {
+public class KeyList implements Iterable<String> {
 
     private static final Object _obj = new Object();
 
@@ -109,4 +110,9 @@ public class KeyList {
 
     }
 
+    @Override
+    public Iterator<String> iterator() {
+        return this.keys.keySet().iterator();
+    }
+
 }