1 files changed, 51 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/databinding/src/main/java/org/apache/tuscany/sca/databinding/Transformer.java b/sca-java-2.x/tags/2.0.1-RC1/modules/databinding/src/main/java/org/apache/tuscany/sca/databinding/Transformer.java
new file mode 100644
index 0000000000..2aa0ad7c15
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+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/databinding/src/main/java/org/apache/tuscany/sca/databinding/Transformer.java
@@ -0,0 +1,51 @@
+/*
+ * 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.tuscany.sca.databinding;
+
+/**
+ * A transformer provides the data transformation from source type to target type. The cost of the transformation is
+ * modelled as weight.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface Transformer {
+    /**
+     * Get the source type that this transformer transforms data from. The type is used as the key when the transformer
+     * is registered with TransformerRegistry.
+     * 
+     * @return A key identifying the source type
+     */
+    String getSourceDataBinding();
+
+    /**
+     * Get the target type that this transformer transforms data into. The type is used as the key when the transformer
+     * is registered with TransformerRegistry.
+     * 
+     * @return A key identifying the target type
+     */
+    String getTargetDataBinding();
+
+    /**
+     * Get the cost of the transformation. The weight can be used to choose the most efficient path if there are more
+     * than one available from the source to the target.
+     * 
+     * @return An integer representing the cost of the transformation
+     */
+    int getWeight();
+}