restructure and base modules for different features

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

diff --git a/nexthopmgr/nexthopmgr-impl/src/main/java/org/opendaylight/vpnservice/nexthopmgr/AbstractDataChangeListener.java b/nexthopmgr/nexthopmgr-impl/src/main/java/org/opendaylight/vpnservice/nexthopmgr/AbstractDataChangeListener.java
new file mode 100644 (file)
index 0000000..bca90b6
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+++ b/nexthopmgr/nexthopmgr-impl/src/main/java/org/opendaylight/vpnservice/nexthopmgr/AbstractDataChangeListener.java
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2015 Ericsson India Global Services Pvt Ltd. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.vpnservice.nexthopmgr;
+
+import com.google.common.base.Optional;
+import com.google.common.base.Preconditions;
+
+import org.opendaylight.controller.md.sal.binding.api.DataChangeListener;
+import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+import java.util.Collections;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * AbstractDataChangeListener implemented basic {@link DataChangeListener} processing for
+ * VPN related Data Objects.
+ */
+public abstract class AbstractDataChangeListener <T extends DataObject> implements DataChangeListener {
+
+    protected final Class<T> clazz;
+
+    public AbstractDataChangeListener(Class<T> clazz) {
+        this.clazz = Preconditions.checkNotNull(clazz, "Class can not be null!");
+    }
+
+    @Override
+    public void onDataChanged(final AsyncDataChangeEvent<InstanceIdentifier<?>, DataObject> changeEvent) {
+        Preconditions.checkNotNull(changeEvent,"Async ChangeEvent can not be null!");
+
+        /* All DataObjects for create */
+        final Map<InstanceIdentifier<?>, DataObject> createdData = changeEvent.getCreatedData() != null
+                ? changeEvent.getCreatedData() : Collections.<InstanceIdentifier<?>, DataObject> emptyMap();
+        /* All DataObjects for remove */
+        final Set<InstanceIdentifier<?>> removeData = changeEvent.getRemovedPaths() != null
+                ? changeEvent.getRemovedPaths() : Collections.<InstanceIdentifier<?>> emptySet();
+        /* All DataObjects for updates */
+        final Map<InstanceIdentifier<?>, DataObject> updateData = changeEvent.getUpdatedData() != null
+                ? changeEvent.getUpdatedData() : Collections.<InstanceIdentifier<?>, DataObject> emptyMap();
+        /* All Original DataObjects */
+        final Map<InstanceIdentifier<?>, DataObject> originalData = changeEvent.getOriginalData() != null
+                ? changeEvent.getOriginalData() : Collections.<InstanceIdentifier<?>, DataObject> emptyMap();
+
+        this.createData(createdData);
+        this.updateData(updateData, originalData);
+        this.removeData(removeData, originalData);
+    }
+
+    @SuppressWarnings("unchecked")
+    private void createData(final Map<InstanceIdentifier<?>, DataObject> createdData) {
+        final Set<InstanceIdentifier<?>> keys = createdData.keySet() != null
+                ? createdData.keySet() : Collections.<InstanceIdentifier<?>> emptySet();
+        for (InstanceIdentifier<?> key : keys) {
+            if (clazz.equals(key.getTargetType())) {
+                 InstanceIdentifier<T> createKeyIdent = key.firstIdentifierOf(clazz);
+                 final Optional<DataObject> value = Optional.of(createdData.get(key));
+                 if (value.isPresent()) {
+                     this.add(createKeyIdent, (T)value.get());
+                 }
+            }
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    private void updateData(final Map<InstanceIdentifier<?>, DataObject> updateData,
+            final Map<InstanceIdentifier<?>, DataObject> originalData) {
+
+        final Set<InstanceIdentifier<?>> keys = updateData.keySet() != null
+                ? updateData.keySet() : Collections.<InstanceIdentifier<?>> emptySet();
+        for (InstanceIdentifier<?> key : keys) {
+          if (clazz.equals(key.getTargetType())) {
+              InstanceIdentifier<T> updateKeyIdent = key.firstIdentifierOf(clazz);
+              final Optional<DataObject> value = Optional.of(updateData.get(key));
+              final Optional<DataObject> original = Optional.of(originalData.get(key));
+              if (value.isPresent() && original.isPresent()) {
+                this.update(updateKeyIdent, (T)original.get(), (T)value.get());
+              }
+          }
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    private void removeData(final Set<InstanceIdentifier<?>> removeData,
+            final Map<InstanceIdentifier<?>, DataObject> originalData) {
+
+        for (InstanceIdentifier<?> key : removeData) {
+            if (clazz.equals(key.getTargetType())) {
+                   final InstanceIdentifier<T> ident = key.firstIdentifierOf(clazz);
+                    final DataObject removeValue = originalData.get(key);
+                    this.remove(ident, (T)removeValue);
+            }
+        }
+    }
+
+    protected abstract void remove(InstanceIdentifier<T> identifier, T del);
+
+    protected abstract void update(InstanceIdentifier<T> identifier, T original, T update);
+
+    protected abstract void add(InstanceIdentifier<T> identifier, T add);
+
+}
+
+