com.stratagis.geoevent.adapter.nmeaplus.NmeaPlusInboundAdapter.java Source code

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Here is the source code for com.stratagis.geoevent.adapter.nmeaplus.NmeaPlusInboundAdapter.java

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/*
  Copyright 1995-2013 Esri
    
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.
    
  For additional information, contact:
  Environmental Systems Research Institute, Inc.
  Attn: Contracts Dept
  380 New York Street
  Redlands, California, USA 92373
    
  email: contracts@esri.com
 */

package com.stratagis.geoevent.adapter.nmeaplus;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.esri.ges.adapter.AdapterDefinition;
import com.esri.ges.adapter.InboundAdapterBase;
import com.esri.ges.core.component.ComponentException;
import com.esri.ges.core.geoevent.GeoEvent;
import com.esri.ges.spatial.Spatial;

public class NmeaPlusInboundAdapter extends InboundAdapterBase {
    private static final Log LOG = LogFactory.getLog(NmeaPlusInboundAdapter.class);
    private final Map<String, NMEAPlusMessageTranslator> translators = new HashMap<String, NMEAPlusMessageTranslator>();
    StringBuilder nameBuffer = new StringBuilder();

    public NmeaPlusInboundAdapter(AdapterDefinition definition) throws ComponentException {
        super(definition);
    }

    private class GeoEventProducer implements Runnable {
        private String channelId;
        private List<byte[]> messages;

        public String deviceName;

        public GeoEventProducer(String channelId, List<byte[]> messages, String deviceName) {
            this.channelId = channelId;
            this.messages = messages;
            this.deviceName = deviceName;
        }

        @Override
        public void run() {
            while (!messages.isEmpty()) {
                String[] data = new String(messages.remove(0)).split(",");
                if (data.length > 0) {
                    String gedName = "NMEAPLUS" + data[0];
                    if (translators.containsKey(gedName)) {
                        try {
                            NMEAPlusMessageTranslator translator = translators.get(gedName);
                            translator.validate(data);
                            GeoEvent geoEvent = geoEventCreator.create(
                                    ((AdapterDefinition) definition).getGeoEventDefinition(gedName).getGuid());
                            geoEvent.setField(0, channelId);

                            if (gedName.equals("NMEAPLUSGPGGA"))
                                geoEvent.setField(12, deviceName);
                            else if (gedName.equals("NMEAPLUSGPGLL"))
                                geoEvent.setField(4, deviceName);
                            else if (gedName.equals("NMEAPLUSGPRMC"))
                                geoEvent.setField(8, deviceName);

                            translator.translate(geoEvent, data);
                            geoEventListener.receive(geoEvent);
                        } catch (Exception e) {
                            LOG.error("Exception while translating a NMEA message : " + e.getMessage());
                        }
                    }
                }
            }
        }
    }

    @Override
    public GeoEvent adapt(ByteBuffer buffer, String channelId) {
        // We don't need to implement anything in here because this method will
        // never get called. It would normally be called
        // by the base class's receive() method. However, we are overriding that
        // method, and our new implementation does not call
        // the adapter's adapt() method.
        return null;
    }

    @Override
    public void receive(ByteBuffer buffer, String channelId) {
        ByteBuffer buffer2 = buffer.duplicate();
        new Thread(new GeoEventProducer(channelId, index(buffer), deviceNameFind(buffer2))).start();
    }

    private static List<byte[]> index(ByteBuffer in) {

        List<byte[]> messages = new ArrayList<byte[]>();
        for (int i = -1; in.hasRemaining();) {
            byte b = in.get();
            if (b == ((byte) '$')) // bom
            {
                i = in.position();
                in.mark();
            } else if (b == ((byte) '\r') || b == ((byte) '\n')) // eom
            {
                if (i != -1) {
                    byte[] message = new byte[in.position() - 1 - i];
                    System.arraycopy(in.array(), i, message, 0, message.length);
                    messages.add(message);
                }
                i = -1;
                in.mark();
            } else if (messages.isEmpty() && i == -1)
                in.mark();
        }
        return messages;
    }

    private static String deviceNameFind(ByteBuffer in) {
        try {
            String input = in.toString();
            int i1 = input.indexOf("#");
            int i2 = input.indexOf("#", i1 + 1);

            if (i1 >= 0 && i2 >= 0 && i1 != i2)
                return input.substring(i1, i2);
            else
                return "NotFound";
        } catch (Exception e) {
            LOG.error("Exception while finding device name : " + e.getMessage());
            return "NotFound";
        }
    }

    @Override
    public void shutdown() {
        super.shutdown();
        translators.clear();
    }

    @Override
    public void setSpatial(Spatial spatial) {
        super.setSpatial(spatial);
        translators.put("NMEAPLUSGPGGA", new NMEAPlusGPGGAMessageTranslator(spatial));
        translators.put("NMEAPLUSGPGLL", new NMEAPlusGPGLLMessageTranslator(spatial));
        translators.put("NMEAPLUSGPRMC", new NMEAPlusGPRMCMessageTranslator(spatial));
    }
}