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Subject: svn commit: r1395064 -
 /commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/builder/BuilderListener.java
Date: Sat, 06 Oct 2012 14:06:52 -0000
To: commits@commons.apache.org
From: oheger@apache.org
Message-Id: <20121006140652.9D6EE2388A29@eris.apache.org>

Author: oheger
Date: Sat Oct  6 14:06:51 2012
New Revision: 1395064

URL: http://svn.apache.org/viewvc?rev=1395064&view=rev
Log:
Added a BuilderListener interface.

Added:
    commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/builder/BuilderListener.java   (with props)

Added: commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/builder/BuilderListener.java
URL: http://svn.apache.org/viewvc/commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/builder/BuilderListener.java?rev=1395064&view=auto
==============================================================================
--- commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/builder/BuilderListener.java (added)
+++ commons/proper/configuration/trunk/src/main/java/org/apache/commons/configuration/builder/BuilderListener.java Sat Oct  6 14:06:51 2012
@@ -0,0 +1,54 @@
+/*
+ * 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.commons.configuration.builder;
+
+import java.util.EventListener;
+
+import org.apache.commons.configuration.Configuration;
+
+/**
+ * <p>
+ * A listener interface for receiving notifications when the status of a
+ * {@link ConfigurationBuilder} is changed.
+ * </p>
+ * <p>
+ * There are use cases when it is of interest to monitor the status of a
+ * {@code ConfigurationBuilder}. Especially, if the builder creates new result
+ * objects dynamically, it may be important to know when it was reset because it
+ * will then return a new result object. This could also mean that the
+ * {@code Configuration} object managed by the builder has changed.
+ * </p>
+ * <p>
+ * This interface defines a single method which gets called when the builder was
+ * reset. A concrete implementation could react on this notification for
+ * instance by querying a new result object or by marking a reference to the
+ * current {@code Configuration} as stale.
+ * </p>
+ *
+ * @version $Id$
+ * @since 2.0
+ */
+public interface BuilderListener extends EventListener
+{
+    /**
+     * Notifies this listener that a reset was performed on the specified
+     * {@code ConfigurationBuilder}.
+     *
+     * @param builder the builder
+     */
+    void builderReset(ConfigurationBuilder<? extends Configuration> builder);
+}

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