Add functions to set username and password.

Also allow specifying these as environment variables so that they don't
have to be in the .dat in plain text.

Author: Daniel Junglas

lib/jdbc-custom-data-source.jar

@@ -30,6 +30,23 @@ public class JdbcConfiguration {
     private String _url = null;
     private String _user = null;
     private String _password = null;
+
+    /** Resolve <code>s</code> using environment variables.
+     * If <code>s</code> starts with "$" and is the name of an existing
+     * environment variable then return the value of that variable, otherwise
+     * return <code>s</code>.
+     * @param s The string to resolve.
+     * @return The value of environment variable <code>s</code> if such a
+     *         variable exists, <code>s</code> otherwise.
+     */
+    private static String resolveString(String s) {
+        if ( s == null || s.length() < 2 || s.charAt(0) != '$' )
+            return s;
+        final String value = System.getenv(s.substring(1));
+        if ( value != null )
+            return value;
+        return s;
+    }
 
     /**
      * Creates a new JDBC configuration.
@@ -46,11 +63,19 @@ public void setUrl(String url) {
     }
 
     public String getUser() {
-        return _user;
+        return resolveString(_user);
+    }
+
+    public void setUser(String user) {
+        _user = user;
     }
 
     public String getPassword() {
-        return _password;
+        return resolveString(_password);
+    }
+
+    public void setPassword(String password) {
+        _password = password;
     }
 
     public Properties getReadQueries() {