Initial draft of vpn service

[vpnservice.git] / vpnmanager-impl / src / main / java / org / opendaylight / vpnservice / AbstractDataChangeListener.java

diff --git a/vpnmanager-impl/src/main/java/org/opendaylight/vpnservice/AbstractDataChangeListener.java b/vpnmanager-impl/src/main/java/org/opendaylight/vpnservice/AbstractDataChangeListener.java
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+/*\r
+ * Copyright (c) 2015 Ericsson India Global Services Pvt Ltd. and others.  All rights reserved.\r
+ *\r
+ * This program and the accompanying materials are made available under the\r
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,\r
+ * and is available at http://www.eclipse.org/legal/epl-v10.html\r
+ */\r
+package org.opendaylight.vpnservice;\r
+\r
+import com.google.common.base.Optional;\r
+import com.google.common.base.Preconditions;\r
+\r
+import org.opendaylight.controller.md.sal.binding.api.DataChangeListener;\r
+import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;\r
+import org.opendaylight.yangtools.yang.binding.DataObject;\r
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;\r
+\r
+import java.util.Collections;\r
+import java.util.Map;\r
+import java.util.Set;\r
+\r
+/**\r
+ * AbstractDataChangeListener implemented basic {@link DataChangeListener} processing for\r
+ * VPN related Data Objects.\r
+ */\r
+public abstract class AbstractDataChangeListener <T extends DataObject> implements DataChangeListener {\r
+\r
+    protected final Class<T> clazz;\r
+\r
+    public AbstractDataChangeListener(Class<T> clazz) {\r
+        this.clazz = Preconditions.checkNotNull(clazz, "Class can not be null!");\r
+    }\r
+\r
+    @Override\r
+    public void onDataChanged(final AsyncDataChangeEvent<InstanceIdentifier<?>, DataObject> changeEvent) {\r
+        Preconditions.checkNotNull(changeEvent,"Async ChangeEvent can not be null!");\r
+\r
+        /* All DataObjects for create */\r
+        final Map<InstanceIdentifier<?>, DataObject> createdData = changeEvent.getCreatedData() != null\r
+                ? changeEvent.getCreatedData() : Collections.<InstanceIdentifier<?>, DataObject> emptyMap();\r
+        /* All DataObjects for remove */\r
+        final Set<InstanceIdentifier<?>> removeData = changeEvent.getRemovedPaths() != null\r
+                ? changeEvent.getRemovedPaths() : Collections.<InstanceIdentifier<?>> emptySet();\r
+        /* All DataObjects for updates */\r
+        final Map<InstanceIdentifier<?>, DataObject> updateData = changeEvent.getUpdatedData() != null\r
+                ? changeEvent.getUpdatedData() : Collections.<InstanceIdentifier<?>, DataObject> emptyMap();\r
+        /* All Original DataObjects */\r
+        final Map<InstanceIdentifier<?>, DataObject> originalData = changeEvent.getOriginalData() != null\r
+                ? changeEvent.getOriginalData() : Collections.<InstanceIdentifier<?>, DataObject> emptyMap();\r
+\r
+        this.createData(createdData);\r
+        this.updateData(updateData, originalData);\r
+        this.removeData(removeData, originalData);\r
+    }\r
+\r
+    @SuppressWarnings("unchecked")\r
+    private void createData(final Map<InstanceIdentifier<?>, DataObject> createdData) {\r
+        final Set<InstanceIdentifier<?>> keys = createdData.keySet() != null\r
+                ? createdData.keySet() : Collections.<InstanceIdentifier<?>> emptySet();\r
+        for (InstanceIdentifier<?> key : keys) {\r
+            if (clazz.equals(key.getTargetType())) {\r
+                 InstanceIdentifier<T> createKeyIdent = key.firstIdentifierOf(clazz);\r
+                 final Optional<DataObject> value = Optional.of(createdData.get(key));\r
+                 if (value.isPresent()) {\r
+                     this.add(createKeyIdent, (T)value.get());\r
+                 }\r
+            }\r
+        }\r
+    }\r
+\r
+    @SuppressWarnings("unchecked")\r
+    private void updateData(final Map<InstanceIdentifier<?>, DataObject> updateData,\r
+            final Map<InstanceIdentifier<?>, DataObject> originalData) {\r
+\r
+        final Set<InstanceIdentifier<?>> keys = updateData.keySet() != null\r
+                ? updateData.keySet() : Collections.<InstanceIdentifier<?>> emptySet();\r
+        for (InstanceIdentifier<?> key : keys) {\r
+          if (clazz.equals(key.getTargetType())) {\r
+              InstanceIdentifier<T> updateKeyIdent = key.firstIdentifierOf(clazz);\r
+              final Optional<DataObject> value = Optional.of(updateData.get(key));\r
+              final Optional<DataObject> original = Optional.of(originalData.get(key));\r
+              if (value.isPresent() && original.isPresent()) {\r
+                this.update(updateKeyIdent, (T)original.get(), (T)value.get());\r
+              }\r
+          }\r
+        }\r
+    }\r
+\r
+    @SuppressWarnings("unchecked")\r
+    private void removeData(final Set<InstanceIdentifier<?>> removeData,\r
+            final Map<InstanceIdentifier<?>, DataObject> originalData) {\r
+\r
+        for (InstanceIdentifier<?> key : removeData) {\r
+            if (clazz.equals(key.getTargetType())) {\r
+                   final InstanceIdentifier<T> ident = key.firstIdentifierOf(clazz);\r
+                    final DataObject removeValue = originalData.get(key);\r
+                    this.remove(ident, (T)removeValue);\r
+            }\r
+        }\r
+    }\r
+\r
+    protected abstract void remove(InstanceIdentifier<T> identifier, T del);\r
+\r
+    protected abstract void update(InstanceIdentifier<T> identifier, T original, T update);\r
+\r
+    protected abstract void add(InstanceIdentifier<T> identifier, T add);\r
+\r
+}\r
+\r
+\r