org.webpda.server.war.ClientCommandDecoder.java Source code

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Here is the source code for org.webpda.server.war.ClientCommandDecoder.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.war;

import java.util.logging.Level;

import javax.websocket.DecodeException;
import javax.websocket.Decoder;
import javax.websocket.EndpointConfig;

import org.webpda.server.core.clientcommand.AbstractClientCommand;
import org.webpda.server.core.util.JsonUtil;
import org.webpda.server.core.util.LoggerUtil;

import com.fasterxml.jackson.databind.JsonNode;

/**Decoder json message received from client to an {@link AbstractClientCommand}.
 * @author Xihui Chen
 *
 */
public class ClientCommandDecoder implements Decoder.Text<AbstractClientCommand> {

    private String packageName = AbstractClientCommand.class.getPackage().getName();;

    @Override
    public void destroy() {

    }

    @Override
    public void init(EndpointConfig config) {

    }

    @Override
    public AbstractClientCommand decode(String arg0) throws DecodeException {
        try {
            JsonNode rootNode = JsonUtil.mapper.readValue(arg0, JsonNode.class);
            String commandName = rootNode.get("commandName").asText();
            Class<?> clazz = Class.forName(packageName + "." + commandName + "Command");
            AbstractClientCommand command = (AbstractClientCommand) JsonUtil.mapper.readValue(arg0, clazz);
            return command;
        } catch (Exception e) {
            LoggerUtil.getLogger().log(Level.SEVERE, "Error in decoding command.", e);

        }
        return null;
    }

    @Override
    public boolean willDecode(String arg0) {
        JsonNode rootNode;
        try {
            rootNode = JsonUtil.mapper.readValue(arg0, JsonNode.class);
            String commandName = rootNode.get("commandName").asText();
            Class<?> clazz = Class.forName(packageName + "." + commandName + "Command");
            if (clazz != null)
                return true;
        } catch (Exception e) {
            LoggerUtil.getLogger().log(Level.SEVERE, "Error in decoding command.", e);
        }
        return false;
    }

}