GUACAMOLE-462: Separate Attributes interface into read-only and read/write variations.

guacamole-ext/src/main/java/org/apache/guacamole/net/auth/Attributes.java

@@ -22,21 +22,10 @@ package org.apache.guacamole.net.auth;
 import java.util.Map;
 
 /**
- * An object which is associated with a set of arbitrary attributes, defined
+ * An object which is associated with a set of arbitrary attributes that may
- * as name/value pairs.
+ * be modifiable, defined as name/value pairs.
  */
-public interface Attributes {
+public interface Attributes extends ReadableAttributes {
-
-    /**
-     * Returns all attributes associated with this object. The returned map
-     * may not be modifiable.
-     *
-     * @return
-     *     A map of all attribute identifiers to their corresponding values,
-     *     for all attributes associated with this object, which may not be
-     *     modifiable.
-     */
-    Map<String, String> getAttributes();
 
     /**
      * Sets the given attributes. If an attribute within the map is not

guacamole-ext/src/main/java/org/apache/guacamole/net/auth/ReadableAttributes.java

@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.guacamole.net.auth;
+
+import java.util.Map;
+
+/**
+ * An object which is associated with a set of arbitrary attributes, defined
+ * as name/value pairs.
+ */
+public interface ReadableAttributes {
+
+    /**
+     * Returns all attributes associated with this object. The returned map
+     * may not be modifiable.
+     *
+     * @return
+     *     A map of all attribute identifiers to their corresponding values,
+     *     for all attributes associated with this object, which may not be
+     *     modifiable.
+     */
+    Map<String, String> getAttributes();
+
+}