Java tutorial
/* * Copyright 2015 Vitaly Litvak (vitavaque@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 pl.datamatica.traccar.api; import com.fasterxml.jackson.databind.ObjectMapper; import org.apache.commons.lang3.StringEscapeUtils; import pl.datamatica.traccar.model.Device; import pl.datamatica.traccar.model.Position; import javax.xml.stream.XMLInputFactory; import javax.xml.stream.XMLStreamException; import javax.xml.stream.XMLStreamReader; import java.io.IOException; import java.io.InputStream; import java.io.StringReader; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.*; public class GPXParser { public static class Result { Position latestPosition; List<Position> positions; } public Result parse(InputStream inputStream, Device device) throws XMLStreamException, ParseException, IOException { Result result = new Result(); TimeZone tz = TimeZone.getTimeZone("UTC"); DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'"); DateFormat dateFormatWithMS = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"); dateFormat.setTimeZone(tz); dateFormatWithMS.setTimeZone(tz); XMLStreamReader xsr = XMLInputFactory.newFactory().createXMLStreamReader(inputStream); ObjectMapper jsonMapper = new ObjectMapper(); result.positions = new LinkedList<>(); Position position = null; Stack<String> extensionsElements = new Stack<>(); boolean extensionsStarted = false; Map<String, Object> other = null; while (xsr.hasNext()) { xsr.next(); if (xsr.getEventType() == XMLStreamReader.START_ELEMENT) { if (xsr.getLocalName().equalsIgnoreCase("trkpt")) { position = new Position(); position.setLongitude(Double.parseDouble(xsr.getAttributeValue(null, "lon"))); position.setLatitude(Double.parseDouble(xsr.getAttributeValue(null, "lat"))); position.setValid(Boolean.TRUE); position.setDevice(device); } else if (xsr.getLocalName().equalsIgnoreCase("time")) { if (position != null) { String strTime = xsr.getElementText(); if (strTime.length() == 20) { position.setTime(dateFormat.parse(strTime)); } else { position.setTime(dateFormatWithMS.parse(strTime)); } } } else if (xsr.getLocalName().equalsIgnoreCase("ele") && position != null) { position.setAltitude(Double.parseDouble(xsr.getElementText())); } else if (xsr.getLocalName().equalsIgnoreCase("address") && position != null) { position.setAddress(StringEscapeUtils.unescapeXml(xsr.getElementText())); } else if (xsr.getLocalName().equalsIgnoreCase("protocol") && position != null) { position.setProtocol(xsr.getElementText()); } else if (xsr.getLocalName().equalsIgnoreCase("speed") && position != null) { position.setSpeed(Double.parseDouble(xsr.getElementText())); } else if (xsr.getLocalName().equalsIgnoreCase("power") && position != null) { position.setPower(Double.parseDouble(xsr.getElementText())); } else if (xsr.getLocalName().equalsIgnoreCase("course") && position != null) { position.setCourse(Double.parseDouble(xsr.getElementText())); } else if (xsr.getLocalName().equalsIgnoreCase("other") && position != null) { position.setOther(StringEscapeUtils.unescapeXml(xsr.getElementText())); } else if (xsr.getLocalName().equalsIgnoreCase("extensions")) { other = new LinkedHashMap<>(); extensionsStarted = true; } else if (position != null && extensionsStarted && other != null) { extensionsElements.push(xsr.getLocalName()); } } else if (xsr.getEventType() == XMLStreamReader.END_ELEMENT) { if (xsr.getLocalName().equalsIgnoreCase("trkpt")) { if (other == null) { other = new HashMap<>(); } if (position.getOther() != null) { if (position.getOther().startsWith("<")) { XMLStreamReader otherReader = XMLInputFactory.newFactory() .createXMLStreamReader(new StringReader(position.getOther())); while (otherReader.hasNext()) { if (otherReader.next() == XMLStreamReader.START_ELEMENT && !otherReader.getLocalName().equals("info")) { other.put(otherReader.getLocalName(), otherReader.getElementText()); } } } else { Map<String, Object> parsedOther = jsonMapper.readValue(position.getOther(), LinkedHashMap.class); other.putAll(parsedOther); } } if (other.containsKey("protocol") && position.getProtocol() == null) { position.setProtocol(other.get("protocol").toString()); } else if (!other.containsKey("protocol") && position.getProtocol() == null) { position.setProtocol("gpx_import"); } other.put("import_type", (result.positions.isEmpty() ? "import_start" : "import")); position.setOther(jsonMapper.writeValueAsString(other)); result.positions.add(position); if (result.latestPosition == null || result.latestPosition.getTime().compareTo(position.getTime()) < 0) { result.latestPosition = position; } position = null; other = null; } else if (xsr.getLocalName().equalsIgnoreCase("extensions")) { extensionsStarted = false; } else if (extensionsStarted) { extensionsElements.pop(); } } else if (extensionsStarted && other != null && xsr.getEventType() == XMLStreamReader.CHARACTERS && !xsr.getText().trim().isEmpty() && !extensionsElements.empty()) { String name = ""; for (int i = 0; i < extensionsElements.size(); i++) { name += (name.length() > 0 ? "-" : "") + extensionsElements.get(i); } other.put(name, xsr.getText()); } } if (result.positions.size() > 1) { Position last = ((LinkedList<Position>) result.positions).getLast(); Map<String, Object> parsedOther = jsonMapper.readValue(last.getOther(), LinkedHashMap.class); parsedOther.put("import_type", "import_end"); last.setOther(jsonMapper.writeValueAsString(parsedOther)); } return result; } }