+ /**\r
+ * add the properly initialised DbSourceProxy object 'proxy' to the list of\r
+ * sequence fetchers\r
+ * \r
+ * @param proxy\r
+ */\r
+ protected void addDbRefSourceImpl(DbSourceProxy proxy)\r
+ {\r
+ if (proxy != null)\r
+ {\r
+ if (FETCHABLEDBS == null)\r
+ {\r
+ FETCHABLEDBS = new Hashtable();\r
+ }\r
+ FETCHABLEDBS.put(proxy.getDbSource(), proxy);\r
+ }\r
+ }\r
+\r
+ /**\r
+ * test if the database handler for dbName contains the given dbProperty\r
+ * \r
+ * @param dbName\r
+ * @param dbProperty\r
+ * @return true if proxy has the given property\r
+ */\r
+ public boolean hasDbSourceProperty(String dbName, String dbProperty)\r
+ {\r
+ // TODO: decide if invalidDbName exception is thrown here.\r
+ DbSourceProxy proxy = getSourceProxy(dbName);\r
+ if (proxy != null)\r
+ {\r
+ if (proxy.getDbSourceProperties() != null)\r
+ {\r
+ return proxy.getDbSourceProperties().containsKey(dbProperty);\r
+ }\r
+ }\r
+ return false;\r
+ }\r
+\r
+ /**\r
+ * select sources which are implemented by instances of the given class\r
+ * \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(\r
+ "Implmentation Error - getDbInstances must be given a class that implements jalview.ws.seqfetcher.DbSourceProxy (was given '"\r
+ + 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