FELIX-639 Logger interface is missing.
git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@741709 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/scr/src/main/java/org/apache/felix/scr/impl/Logger.java b/scr/src/main/java/org/apache/felix/scr/impl/Logger.java
new file mode 100644
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+++ b/scr/src/main/java/org/apache/felix/scr/impl/Logger.java
@@ -0,0 +1,44 @@
+/*
+ * 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.felix.scr.impl;
+
+
+/**
+ * The <code>Logger</code> interface defines a simple API to enable some logging
+ * in the XML Parser and ComponentMetadata handling classes and at the same
+ * time not be too intrusive for the unit tests.
+ */
+interface Logger
+{
+
+ /**
+ * Writes a messages for the given <code>ComponentMetadata</code>.
+ *
+ * @param level The log level of the messages. This corresponds to the log
+ * levels defined by the OSGi LogService.
+ * @param message The message to print
+ * @param metadata The {@link ComponentMetadata} whose processing caused
+ * the message. This may be <code>null</code> if the component
+ * metadata is not known or applicable.
+ * @param ex The <code>Throwable</code> causing the message to be logged.
+ * This may be <code>null</code>.
+ */
+ void log( int level, String message, ComponentMetadata metadata, Throwable ex );
+
+}