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diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/databinding/src/main/java/org/apache/tuscany/sca/databinding/WrapperHandler.java b/sca-java-2.x/tags/2.0.1-RC1/modules/databinding/src/main/java/org/apache/tuscany/sca/databinding/WrapperHandler.java
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+/*
+ * 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;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.interfacedef.DataType;
+import org.apache.tuscany.sca.interfacedef.Operation;
+
+/**
+ * A contract for transformers to deal with wrapping/unwrapping for WSDL wrapper style operations
+ *
+ * @version $Rev$ $Date$
+ * @tuscany.spi.extension.inheritfrom
+ */
+public interface WrapperHandler<T> {
+ /**
+ * Create a wrapper element
+ * @param operation The operation
+ * @param input Is it for input or output
+ * @return An object representing the wrapper element
+ */
+ T create(Operation operation, boolean input);
+
+ /**
+ * Get the data type for the wrapper
+ * @param operation The operation
+ * @param input Is it for input or output?
+ * @return The data type of the wrapper, null if it's not a wrapper type
+ */
+ DataType getWrapperType(Operation operation, boolean input);
+
+ /**
+ * Check if the given data is an instance of the wrapper
+ * @param wrapper
+ * @param operation The operation
+ * @param input Input or output
+ * @return
+ */
+ boolean isInstance(Object wrapper, Operation operation, boolean input);
+
+ /**
+ * Populate the wrapper element with the child objects
+ * @param wrapper The wrapper object
+ * @param childObjects The child objects
+ * @param operation The operation
+ * @param input Is it for input or output
+ */
+ void setChildren(T wrapper,
+ Object[] childObjects,
+ Operation operation,
+ boolean input);
+
+ /**
+ * Get a list of child elements from the wrapper
+ * @param wrapper The wrapper object
+ * @param operation The operation
+ * @param input Is it for input or output
+ * @return child elements under the wrapper
+ */
+ List getChildren(T wrapper, Operation operation, boolean input);
+}