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Diffstat (limited to 'src/org/traccar/protocol')
| -rw-r--r-- | src/org/traccar/protocol/EnforaProtocolDecoder.java | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/EnforaProtocolDecoder.java b/src/org/traccar/protocol/EnforaProtocolDecoder.java new file mode 100644 index 000000000..eb9cb8ae4 --- /dev/null +++ b/src/org/traccar/protocol/EnforaProtocolDecoder.java @@ -0,0 +1,187 @@ +/* + * Copyright 2012 Anton Tananaev (anton.tananaev@gmail.com) + * + * 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.traccar.protocol; + +import java.nio.charset.Charset; +import java.util.Calendar; +import java.util.GregorianCalendar; +import java.util.TimeZone; +import java.util.regex.Matcher; +import java.util.regex.Pattern; +import org.jboss.netty.buffer.ChannelBuffer; +import org.jboss.netty.channel.Channel; +import org.jboss.netty.channel.ChannelHandlerContext; +import org.traccar.GenericProtocolDecoder; +import org.traccar.helper.Log; +import org.traccar.model.DataManager; +import org.traccar.model.Position; + +/** + * Enfora protocol decoder + */ +public class EnforaProtocolDecoder extends GenericProtocolDecoder { + + /** + * Initialize + */ + public EnforaProtocolDecoder(DataManager dataManager, Integer resetDelay) { + super(dataManager, resetDelay); + } + + /** + * Regular expressions pattern + */ + static private Pattern pattern = Pattern.compile( + "GPRMC," + + "(\\d{2})(\\d{2})(\\d{2}).(\\d{2})," + // Time (HHMMSS.SS) + "([AV])," + // Validity + "(\\d{2})(\\d{2}.\\d{6})," + // Latitude (DDMM.MMMMMM) + "([NS])," + + "(\\d{3})(\\d{2}.\\d{6})," + // Longitude (DDDMM.MMMMMM) + "([EW])," + + "(\\d+.\\d)?," + // Speed + "(\\d+.\\d)?," + // Course + "(\\d{2})(\\d{2})(\\d{2})," + // Date (DDMMYY) + ".*[\r\n]*"); + + public static final int IMEI_LENGTH = 15; + + // TODO: avoid copy-paste (from XexunFrameDecoder) + private static Integer find( + ChannelBuffer buf, + Integer start, + Integer length, + String subString) { + + int index = start; + boolean match; + + for (; index < length; index++) { + match = true; + + for (int i = 0; i < subString.length(); i++) { + char c = (char) buf.getByte(index + i); + if (c != subString.charAt(i)) { + match = false; + break; + } + } + + if (match) { + return index; + } + } + + return null; + } + + /** + * Decode message + */ + protected Object decode( + ChannelHandlerContext ctx, Channel channel, Object msg) + throws Exception { + + ChannelBuffer buf = (ChannelBuffer) msg; + + // Find IMEI (Modem ID) + String imei = null; + for (int first = -1, i = 0; i < buf.readableBytes(); i++) { + if (!Character.isDigit((char) buf.getByte(i))) { + first = i + 1; + } + + // Found digit string + if (i - first == IMEI_LENGTH - 1) { + imei = buf.toString(first, IMEI_LENGTH, Charset.defaultCharset()); + break; + } + } + + // Write log + if (imei == null) { + Log.warning("Enfora decoder failed to find IMEI"); + return null; + } + + // Find GPSMC string + Integer start = find(buf, 0, buf.readableBytes(), "GPRMC"); + if (start == null) { + // Message does not contain GPS data + return null; + } + String sentence = buf.toString(start, buf.readableBytes() - start, Charset.defaultCharset()); + + // Parse message + Matcher parser = pattern.matcher(sentence); + if (!parser.matches()) { + return null; + } + + // Create new position + Position position = new Position(); + Integer index = 1; + + // Get device by IMEI + position.setDeviceId(getDataManager().getDeviceByImei(imei).getId()); + + // Time + Calendar time = new GregorianCalendar(TimeZone.getTimeZone("UTC")); + time.clear(); + time.set(Calendar.HOUR, Integer.valueOf(parser.group(index++))); + time.set(Calendar.MINUTE, Integer.valueOf(parser.group(index++))); + time.set(Calendar.SECOND, Integer.valueOf(parser.group(index++))); + time.set(Calendar.MILLISECOND, Integer.valueOf(parser.group(index++)) * 10); + + // Validity + position.setValid(parser.group(index++).compareTo("A") == 0 ? true : false); + + // Latitude + Double latitude = Double.valueOf(parser.group(index++)); + latitude += Double.valueOf(parser.group(index++)) / 60; + if (parser.group(index++).compareTo("S") == 0) latitude = -latitude; + position.setLatitude(latitude); + + // Longitude + Double lonlitude = Double.valueOf(parser.group(index++)); + lonlitude += Double.valueOf(parser.group(index++)) / 60; + if (parser.group(index++).compareTo("W") == 0) lonlitude = -lonlitude; + position.setLongitude(lonlitude); + + // Altitude + position.setAltitude(0.0); + + // Speed + position.setSpeed(Double.valueOf(parser.group(index++))); + + // Course + String course = parser.group(index++); + if (course != null) { + position.setCourse(Double.valueOf(course)); + } else { + position.setCourse(0.0); + } + + // Date + time.set(Calendar.DAY_OF_MONTH, Integer.valueOf(parser.group(index++))); + time.set(Calendar.MONTH, Integer.valueOf(parser.group(index++)) - 1); + time.set(Calendar.YEAR, 2000 + Integer.valueOf(parser.group(index++))); + position.setTime(time.getTime()); + + return position; + } + +} |