GUI -- Deleted deprecated UIMessageHandler.

Change-Id: Ia26853b6cb1198b232edd4e8f0cfffa8ad92dd55

-/*
- * Copyright 2015 Open Networking Laboratory
- *
- * Licensed 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.onosproject.ui;
-
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.node.ObjectNode;
-import org.onlab.osgi.ServiceDirectory;
-
-import java.util.Set;
-
-import static com.google.common.base.Preconditions.checkArgument;
-import static com.google.common.base.Preconditions.checkNotNull;
-
-/**
- * Abstraction of an entity capable of processing a JSON message from the user
- * interface client.
- * <p>
- * The message is a JSON object with the following structure:
- * </p>
- * <pre>
- * {
- *     "type": "<em>event-type</em>",
- *     "sid": "<em>sequence-number</em>",
- *     "payload": {
- *         <em>arbitrary JSON object structure</em>
- *     }
- * }
- * </pre>
- */
-@Deprecated
-public abstract class UiMessageHandler {
-
-    private final Set<String> messageTypes;
-    private UiConnection connection;
-    private ServiceDirectory directory;
-
-    /**
-     * Mapper for creating ObjectNodes and ArrayNodes etc.
-     */
-    protected final ObjectMapper mapper = new ObjectMapper();
-
-    /**
-     * Creates a new message handler for the specified set of message types.
-     *
-     * @param messageTypes set of message types
-     */
-    protected UiMessageHandler(Set<String> messageTypes) {
-        this.messageTypes = checkNotNull(messageTypes, "Message types cannot be null");
-        checkArgument(!messageTypes.isEmpty(), "Message types cannot be empty");
-    }
-
-    /**
-     * Returns the set of message types which this handler is capable of
-     * processing.
-     *
-     * @return set of message types
-     */
-    public Set<String> messageTypes() {
-        return messageTypes;
-    }
-
-    /**
-     * Processes a JSON message from the user interface client.
-     *
-     * @param message JSON message
-     */
-    public abstract void process(ObjectNode message);
-
-    /**
-     * Initializes the handler with the user interface connection and
-     * service directory context.
-     *
-     * @param connection user interface connection
-     * @param directory  service directory
-     */
-    public void init(UiConnection connection, ServiceDirectory directory) {
-        this.connection = connection;
-        this.directory = directory;
-    }
-
-    /**
-     * Destroys the message handler context.
-     */
-    public void destroy() {
-        this.connection = null;
-        this.directory = null;
-    }
-
-    /**
-     * Returns the user interface connection with which this handler was primed.
-     *
-     * @return user interface connection
-     */
-    public UiConnection connection() {
-        return connection;
-    }
-
-    /**
-     * Returns the user interface connection with which this handler was primed.
-     *
-     * @return user interface connection
-     */
-    public ServiceDirectory directory() {
-        return directory;
-    }
-
-    /**
-     * Returns implementation of the specified service class.
-     *
-     * @param serviceClass service class
-     * @param <T>          type of service
-     * @return implementation class
-     * @throws org.onlab.osgi.ServiceNotFoundException if no implementation found
-     */
-    protected <T> T get(Class<T> serviceClass) {
-        return directory.get(serviceClass);
-    }
-
-    /**
-     * Wraps a message payload into an event structure for the given event
-     * type and sequence ID. Generally the
-     *
-     * @param type    event type
-     * @param sid     sequence ID
-     * @param payload event payload
-     * @return the object node representation
-     */
-    protected ObjectNode envelope(String type, long sid, ObjectNode payload) {
-        return JsonUtils.envelope(type, sid, payload);
-    }
-
-    /**
-     * Returns the event type from the specified event.
-     *
-     * @param event the event
-     * @return the event type
-     */
-    protected String eventType(ObjectNode event) {
-        return JsonUtils.eventType(event);
-    }
-
-    /**
-     * Retrieves the payload from the specified event.
-     *
-     * @param event message event
-     * @return extracted payload object
-     */
-    protected ObjectNode payload(ObjectNode event) {
-        return JsonUtils.payload(event);
-    }
-
-    /**
-     * Returns the specified node property as a number.
-     *
-     * @param node message event
-     * @param name property name
-     * @return property as number
-     */
-    protected long number(ObjectNode node, String name) {
-        return JsonUtils.number(node, name);
-    }
-
-    /**
-     * Returns the specified node property as a string.
-     *
-     * @param node message event
-     * @param name property name
-     * @return property as a string
-     */
-    protected String string(ObjectNode node, String name) {
-        return JsonUtils.string(node, name);
-    }
-
-    /**
-     * Returns the specified node property as a string with a default fallback.
-     *
-     * @param node         message event
-     * @param name         property name
-     * @param defaultValue fallback value if property is absent
-     * @return property as a string
-     */
-    protected String string(ObjectNode node, String name, String defaultValue) {
-        return JsonUtils.string(node, name, defaultValue);
-    }
-
-    /**
-     * Concatenates an arbitrary number of objects, using their
-     * toString() methods.
-     *
-     * @param items the items to concatenate
-     * @return a concatenated string
-     */
-    protected static String concat(Object... items) {
-        StringBuilder sb = new StringBuilder();
-        for (Object o : items) {
-            sb.append(o);
-        }
-        return sb.toString();
-    }
-}