upgrade to java.time

examples/src/OpenDis7Examples/PduTrack.java

@@ -49,13 +49,13 @@ import java.io.ByteArrayOutputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
 import java.nio.ByteBuffer;
-import java.text.DateFormat;
-import java.text.SimpleDateFormat;
-import java.time.Instant;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
-import java.util.Date;
+import java.time.Instant;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
 
 /**
  * Create a track from DIS ESPDUs
@@ -63,11 +63,11 @@ import java.util.Date;
  */
 public class PduTrack
 {   
-    private String      descriptor = new String();
-    private ArrayList<Pdu> pduList = new ArrayList<>();
-    private EntityStatePdu initialEspdu;
+    private String          descriptor = new String();
+    private ArrayList<Pdu>  pduList = new ArrayList<>();
+    private EntityStatePdu  initialEspdu;
     private EntityStatePdu  latestEspdu;
-    private Vector3Double  initialLocation;
+    private Vector3Double   initialLocation;
     private Vector3Double   latestLocation;
     
     /** waypoint timelineList in seconds */
@@ -85,18 +85,29 @@ public class PduTrack
     private String      x3dOrientationInterpolatorDEF = new String();
     private boolean      addLineBreaksWithinKeyValues = false;
     
-    protected PduFactory            pduFactory            = new PduFactory();
-    DisTime.TimestampStyle          timestampStyle        = DisTime.TimestampStyle.IEEE_ABSOLUTE;
-    protected ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
-    protected DataOutputStream      dataOutputStream      = new DataOutputStream(byteArrayOutputStream);
-    private String TRACE_PREFIX = "[" + (PduTrack.class.getSimpleName()) + "] ";
+    protected PduFactory             pduFactory            = new PduFactory();
+    public    DisTime.TimestampStyle timestampStyle        = DisTime.TimestampStyle.IEEE_ABSOLUTE;
+    private   LocalDateTime          recordingStart;
+    private   LocalDateTime          recordingStop;
+    private   String                 todaysDateString      = new String();
+    
+    protected ByteArrayOutputStream  byteArrayOutputStream = new ByteArrayOutputStream();
+    protected DataOutputStream       dataOutputStream      = new DataOutputStream(byteArrayOutputStream);
+    private   String TRACE_PREFIX = "[" + (PduTrack.class.getSimpleName()) + "] ";
     
     /**
      * Constructor for PduTrack
      */
     public PduTrack()
     {
-        // can place initialization code here
+        // initialization code here
+        
+        // https://docs.oracle.com/javase/tutorial/datetime/TOC.html
+        // https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/time/package-summary.html
+        // https://stackoverflow.com/questions/5175728/how-to-get-the-current-date-time-in-java/5175900 (scroll down to java.time)
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d MMMM yyyy");
+        todaysDateString = LocalDate.now().format(formatter);
+//      System.out.println(TRACE_PREFIX + "today=" + todayString);
     }
     
     /**
@@ -107,6 +118,7 @@ public class PduTrack
     {
         timestampStyle = newTimestampStyle;
         DisTime.setTimestampStyle(newTimestampStyle);
+        // automatic super invocation: return PduTrack();
     }
     
     /**
@@ -642,7 +654,7 @@ public class PduTrack
      * @return X3D PositionInterpolator as string
      */
     public String createX3dModelHeaderString()
-    {
+    {        
         StringBuilder sb = new StringBuilder();
         
         sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>").append("\n");
@@ -653,12 +665,8 @@ public class PduTrack
             sb.append("    <meta content='").append(getX3dModelName()).append("' name='title'/>").append("\n");
         sb.append("    <meta content='Conversion of ESPDU track into X3D animation interpolators and LineSet.' name='description'/>").append("\n");
         
-        // https://docs.oracle.com/javase/tutorial/datetime/TOC.html
-        // https://stackoverflow.com/questions/5175728/how-to-get-the-current-date-time-in-java/5175900
-        DateFormat dateFormat = new SimpleDateFormat("d MMMM yyyy");
-        Date date = new Date();
         sb.append("    <meta content='1 January 2022' name='created'/>").append("\n");
-        sb.append("    <meta content='").append(dateFormat.format(date)).append("' name='modified'/>").append("\n");
+        sb.append("    <meta content='").append(todaysDateString).append("' name='modified'/>").append("\n");
         if (!getAuthor().isEmpty())
             sb.append("    <meta content='").append(getAuthor()).append("' name='creator'/>").append("\n");
         if (!getX3dModelIdentifier().isEmpty())