runtime/org.argeo.slc.support.gis/src/main/java/org/argeo/slc/gpsbabel/GpsBabelPositionProvider.java

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.argeo.slc.gpsbabel;
  18
  19 import java.util.StringTokenizer;
  20
  21 import org.apache.commons.logging.Log;
  22 import org.apache.commons.logging.LogFactory;
  23 import org.argeo.slc.gis.model.FieldPosition;
  24 import org.argeo.slc.jts.PositionProvider;
  25
  26 import com.vividsolutions.jts.geom.Coordinate;
  27 import com.vividsolutions.jts.geom.GeometryFactory;
  28 import com.vividsolutions.jts.geom.Point;
  29
  30 public class GpsBabelPositionProvider implements PositionProvider {
  31         private Log log = LogFactory.getLog(GpsBabelPositionProvider.class);
  32
  33         private GpsBabelCall gpsBabelCall;
  34
  35         private GeometryFactory geometryFactory = new GeometryFactory();
  36
  37         private String inputFormat = "garmin,get_posn";
  38         private String inputFile = "usb:";
  39
  40         private Boolean silentlyFailing = false;
  41
  42         public void init() {
  43                 gpsBabelCall = new GpsBabelCall(inputFormat, inputFile, "csv", "-");
  44         }
  45
  46         public FieldPosition currentPosition() {
  47                 // lazy init
  48                 if (gpsBabelCall == null)
  49                         init();
  50
  51                 String output;
  52                 try {
  53                         output = gpsBabelCall.function();
  54                         silentlyFailing = false;
  55                 } catch (Exception e) {
  56                         if (!silentlyFailing) {
  57                                 log.warn(e.getMessage()
  58                                                 + ": "
  59                                                 + (e.getCause() != null ? e.getCause().getMessage()
  60                                                                 : ""));
  61                                 if (log.isTraceEnabled())
  62                                         e.printStackTrace();
  63                                 silentlyFailing = true;
  64                         }
  65                         return null;
  66                 }
  67                 StringTokenizer st = new StringTokenizer(output, ",");
  68                 Double latitude = Double.parseDouble(st.nextToken());
  69                 Double longitude = Double.parseDouble(st.nextToken());
  70                 Point position = geometryFactory.createPoint(new Coordinate(longitude,
  71                                 latitude));
  72                 return new FieldPosition(position);
  73         }
  74
  75         public void setInputFormat(String inputFormat) {
  76                 this.inputFormat = inputFormat;
  77         }
  78
  79         public void setInputFile(String inputFile) {
  80                 this.inputFile = inputFile;
  81         }
  82
  83 }