org.webpda.server.core.servermessage.NonPVEventMessage.java Source code

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Here is the source code for org.webpda.server.core.servermessage.NonPVEventMessage.java

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/*******************************************************************************
 * Copyright (c) 2013 Oak Ridge National Laboratory.
 * 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.webpda.server.core.servermessage;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.webpda.server.core.util.JsonUtil;

import com.fasterxml.jackson.core.JsonGenerator;

/**A server message that is not a PV event. It has a message field to indicate 
 * the message name.
 * @author Xihui Chen
 *
 */
public abstract class NonPVEventMessage extends AbstractTextMessage {

    private static final String MESSAGE = "msg";

    protected JsonGenerator createJsonGenerator() throws IOException {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        JsonGenerator jg = JsonUtil.jsonFactory.createGenerator(outputStream);
        jg.writeStartObject();
        jg.writeStringField(MESSAGE, getClass().getSimpleName().replaceAll("Message", ""));
        return jg;
    }

}