First commit for issue-790.

Added optional velocity vector to both CPF parser and writer.

src/main/java/org/orekit/files/ilrs/CPF.java

@@ -141,6 +141,25 @@ public class CPF implements EphemerisFile<CPF.CPFCoordinate, CPF.CPFEphemeris> {
         ephemeris.get(id).coordinates.add(coord);
     }
 
+    /**
+     * Add the velocity to the last CPF coordinate entry.
+     * @param id satellite ILRS identifier
+     * @param velocity the velocity vector of the satellite
+     */
+    public void addSatelliteVelocityToCPFCoordinate(final String id, final Vector3D velocity) {
+        // Get the last coordinate entry, which contains the position vector
+        final CPFCoordinate lastCoordinate = ephemeris.get(id).coordinates.get(ephemeris.get(id).coordinates.size() - 1);
+
+        // Create a new CPFCoordinate object with both position and velocity information
+        final CPFCoordinate CPFCoordUpdated = new CPFCoordinate(lastCoordinate.getDate(),
+                lastCoordinate.getPosition(),
+                velocity,
+                lastCoordinate.getLeap());
+
+        // Patch the last record
+        ephemeris.get(id).coordinates.set(ephemeris.get(id).coordinates.size() - 1, CPFCoordUpdated);
+    }
+
     /**
      * Set the interpolation sample.
      * @param interpolationSample interpolation sample

src/main/java/org/orekit/files/ilrs/CPFParser.java

@@ -496,7 +496,18 @@ public class CPFParser implements EphemerisFileParser<CPF> {
             /** {@inheritDoc} */
             @Override
             public void parse(final String line, final ParseInfo pi) {
-                // Not implemented yet
+
+                // Data contained in the line
+                final String[] values = SEPARATOR.split(line);
+
+                // Coordinates
+                final double x = Double.parseDouble(values[2]);
+                final double y = Double.parseDouble(values[3]);
+                final double z = Double.parseDouble(values[4]);
+                final Vector3D velocity = new Vector3D(x, y, z);
+
+                // CPF coordinate
+                pi.file.addSatelliteVelocityToCPFCoordinate(pi.file.getHeader().getIlrsSatelliteId(), velocity);
             }
 
             /** {@inheritDoc} */