Bug 624 - Separate netty and exi specific classes from netconf-util.

[controller.git] / opendaylight / netconf / netconf-netty-util / src / main / java / org / opendaylight / controller / netconf / nettyutil / handler / ssh / client / Invoker.java

diff --git a/opendaylight/netconf/netconf-netty-util/src/main/java/org/opendaylight/controller/netconf/nettyutil/handler/ssh/client/Invoker.java b/opendaylight/netconf/netconf-netty-util/src/main/java/org/opendaylight/controller/netconf/nettyutil/handler/ssh/client/Invoker.java
new file mode 100644 (file)
index 0000000..d542e19
--- /dev/null
+++ b/opendaylight/netconf/netconf-netty-util/src/main/java/org/opendaylight/controller/netconf/nettyutil/handler/ssh/client/Invoker.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2013 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.netconf.nettyutil.handler.ssh.client;
+
+import java.io.IOException;
+
+/**
+ * Abstract class providing mechanism of invoking various SSH level services.
+ * Class is not allowed to be extended, as it provides its own implementations via instance initiators.
+ */
+public abstract class Invoker {
+    private boolean invoked = false;
+
+    private Invoker(){}
+
+    protected boolean isInvoked() {
+        // TODO invoked is always false
+        return invoked;
+    }
+
+    abstract void invoke(SshSession session) throws IOException;
+
+    /**
+     * Invoker implementation to invokes subsystem SSH service.
+     *
+     * @param subsystem
+     * @return
+     */
+    public static Invoker subsystem(final String subsystem) {
+        return new Invoker() {
+            @Override
+            void invoke(SshSession session) throws IOException {
+                if (isInvoked()) {
+                    throw new IllegalStateException("Already invoked.");
+                }
+
+                session.startSubSystem(subsystem);
+            }
+        };
+    }
+}