BUG-5280: add ClientTransactionCursor

[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / databroker / actors / dds / ClientTransactionCursor.java

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/actors/dds/ClientTransactionCursor.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/actors/dds/ClientTransactionCursor.java
new file mode 100644 (file)
index 0000000..bbd8534
--- /dev/null
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/actors/dds/ClientTransactionCursor.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2016 Cisco Systems, Inc. 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.controller.cluster.databroker.actors.dds;
+
+import com.google.common.base.Preconditions;
+import java.util.Arrays;
+import org.opendaylight.mdsal.dom.api.DOMDataTreeWriteCursor;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
+
+/**
+ * A {@link DOMDataTreeWriteCursor} tied to a {@link ClientTransaction}.
+ *
+ * @author Robert Varga
+ */
+final class ClientTransactionCursor implements DOMDataTreeWriteCursor {
+    private YangInstanceIdentifier current = YangInstanceIdentifier.EMPTY;
+    private final ClientTransaction parent;
+
+    ClientTransactionCursor(final ClientTransaction parent) {
+        this.parent = Preconditions.checkNotNull(parent);
+    }
+
+    @Override
+    public void enter(final PathArgument child) {
+        current = current.node(child);
+    }
+
+    @Override
+    public void enter(final PathArgument... path) {
+        enter(Arrays.asList(path));
+    }
+
+    @Override
+    public void enter(final Iterable<PathArgument> path) {
+        path.forEach(this::enter);
+    }
+
+    @Override
+    public void exit() {
+        final YangInstanceIdentifier parent = current.getParent();
+        Preconditions.checkState(parent != null);
+        current = parent;
+    }
+
+    @Override
+    public void exit(final int depth) {
+        for (int i = 0; i < depth; ++i) {
+            exit();
+        }
+    }
+
+    @Override
+    public void close() {
+        parent.closeCursor(this);
+    }
+
+    @Override
+    public void delete(final PathArgument child) {
+        parent.delete(current.node(child));
+    }
+
+    @Override
+    public void merge(final PathArgument child, final NormalizedNode<?, ?> data) {
+        parent.merge(current.node(child), data);
+    }
+
+    @Override
+    public void write(final PathArgument child, final NormalizedNode<?, ?> data) {
+        parent.write(current.node(child), data);
+    }
+}