1 files changed, 104 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/impl/GroupDataBinding.java b/sca-java-2.x/tags/2.0.1-RC1/modules/databinding/src/main/java/org/apache/tuscany/sca/databinding/impl/GroupDataBinding.java
new file mode 100644
index 0000000000..1c7220fa67
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/databinding/src/main/java/org/apache/tuscany/sca/databinding/impl/GroupDataBinding.java
@@ -0,0 +1,104 @@
+/*
+ * 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.impl;
+
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+
+import org.apache.tuscany.sca.databinding.BaseDataBinding;
+import org.apache.tuscany.sca.interfacedef.DataType;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.interfacedef.util.XMLType;
+
+/**
+ * The base class for a special databinding which represents a group of other databindings
+ * 
+ * @version $Rev$ $Date$
+ */
+public abstract class GroupDataBinding extends BaseDataBinding {
+    public static final String NAME = "databinding:group";
+
+    /**
+     * Marker type is a java class or interface representing the data format. 
+     */
+    protected Class[] markerTypes;
+
+    public GroupDataBinding(Class[] types) {
+        super(NAME, GroupDataBinding.class);
+        this.markerTypes = types;
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public boolean introspect(DataType type, Operation operation) {
+        if (markerTypes == null) {
+            return false;
+        }
+        Type physical = type.getPhysical();
+        if (physical instanceof ParameterizedType) {
+            physical = ((ParameterizedType)physical).getRawType();
+        }
+        if (!(physical instanceof Class)) {
+            return false;
+        }
+        Class cls = (Class)physical;
+        for (Class<?> c : markerTypes) {
+            if (isTypeOf(c, cls)) {
+                type.setDataBinding(getDataBinding(c));
+                Object logical = getLogical(cls, null);
+                if (logical != null) {
+                    type.setLogical(getLogical(cls, null));
+                } else {
+                    type.setLogical(XMLType.UNKNOWN);
+                }
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Test if the given type is a subtype of the base type
+     * @param markerType
+     * @param type
+     * @return
+     */
+    protected boolean isTypeOf(Class<?> markerType, Class<?> type) {
+        return markerType.isAssignableFrom(type);
+    }
+
+    /**
+     * Derive the databinding name from a base class
+     * @param baseType
+     * @return
+     */
+    protected String getDataBinding(Class<?> baseType) {
+        return baseType.getName();
+    }
+
+    /**
+     * Get the logical type
+     * @param type The java type
+     * @param operation TODO
+     * @return
+     */
+    protected abstract Object getLogical(Class<?> type, Operation operation);
+
+}