select source by implementation class

diff --git a/src/jalview/ws/seqfetcher/ASequenceFetcher.java b/src/jalview/ws/seqfetcher/ASequenceFetcher.java
index 8a8cf44..013fb15 100644 (file)
--- a/src/jalview/ws/seqfetcher/ASequenceFetcher.java
+++ b/src/jalview/ws/seqfetcher/ASequenceFetcher.java
@@ -297,4 +297,37 @@ public class ASequenceFetcher
     return false;\r
   }\r
 \r
+  /**\r
+   * select sources which are implemented by instances of the given class\r
+   * @param class that implements DbSourceProxy\r
+   * @return null or vector of source names for fetchers\r
+   */\r
+  public String[] getDbInstances(Class class1)\r
+  {\r
+    if (!jalview.ws.seqfetcher.DbSourceProxy.class.isAssignableFrom(class1))\r
+    {\r
+      throw new Error("Implmentation Error - getDbInstances must be given a class that implements jalview.ws.seqfetcher.DbSourceProxy (was given '"+class1+"')");\r
+    }\r
+    if (FETCHABLEDBS==null)\r
+    {\r
+      return null;\r
+    }\r
+    String[] sources = null;\r
+    Vector src = new Vector();\r
+    Enumeration dbs = FETCHABLEDBS.keys();\r
+    while (dbs.hasMoreElements())\r
+    {\r
+      String dbn = (String) dbs.nextElement();\r
+      DbSourceProxy dbp = (DbSourceProxy) FETCHABLEDBS.get(dbn);\r
+      if (class1.isAssignableFrom(dbp.getClass()))\r
+      {\r
+        src.addElement(dbn);\r
+      }\r
+    }\r
+    if (src.size()>0)\r
+    {\r
+      src.copyInto(sources = new String[src.size()]);\r
+    }\r
+    return sources;\r
+  }\r
 }\r