Removed use of JAXB DatatypeConverter (#327).

Author: gmessner

src/main/java/org/gitlab4j/api/utils/ISO8601.java

@@ -2,28 +2,39 @@
 
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeFormatterBuilder;
+import java.time.temporal.ChronoField;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.Map;
 import java.util.TimeZone;
 import java.util.concurrent.ConcurrentHashMap;
 
-import javax.xml.bind.DatatypeConverter;
-
 /**
  * This class provides utility methods for parsing and formatting ISO8601 formatted dates.
  */
 public class ISO8601 {
 
     public static final String PATTERN = "yyyy-MM-dd'T'HH:mm:ssZ";
+    public static final String MSEC_PATTERN = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";
     public static final String SPACEY_PATTERN = "yyyy-MM-dd HH:mm:ss Z";
+    public static final String SPACEY_MSEC_PATTERN = "yyyy-MM-dd HH:mm:ss.SSS Z";
     public static final String PATTERN_MSEC = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";
     public static final String OUTPUT_PATTERN = "yyyy-MM-dd'T'HH:mm:ss'Z'";
     public static final String OUTPUT_MSEC_PATTERN = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
     public static final String UTC_PATTERN = "yyyy-MM-dd HH:mm:ss 'UTC'";
 
-    private static final String PATTERN_REGEX = "\\d\\d\\d\\d-\\d\\d-\\d\\dT\\d\\d:\\d\\d:\\d\\d[-+]\\d\\d\\d\\d";
-    private static final String SPACEY_PATTERN_REGEX = "\\d\\d\\d\\d-\\d\\d-\\d\\d \\d\\d:\\d\\d:\\d\\d [-+]\\d\\d\\d\\d";
+    private static final DateTimeFormatter ODT_WITH_MSEC_PARSER = new DateTimeFormatterBuilder().appendPattern("yyyy-MM-dd[['T'][ ]HH:mm:ss.SSS[ ][XXXXX][XXXX]]").toFormatter();
+    private static final DateTimeFormatter ODT_PARSER = new DateTimeFormatterBuilder().appendPattern("yyyy-MM-dd[['T'][ ]HH:mm:ss[.SSS][ ][X][XXX]]")
+        .parseDefaulting(ChronoField.HOUR_OF_DAY, 0)
+        .parseDefaulting(ChronoField.MINUTE_OF_HOUR, 0)
+        .parseDefaulting(ChronoField.SECOND_OF_MINUTE, 0)
+        .parseDefaulting(ChronoField.MILLI_OF_SECOND, 0)
+        .parseDefaulting(ChronoField.OFFSET_SECONDS, 0)
+        .toFormatter();
 
     // Set up ThreadLocal storage to save a thread local SimpleDateFormat keyed with the format string
     private static final class SafeDateFormatter {
@@ -116,39 +127,43 @@ public static String toString(Date date) {
     }
 
     /**
-     * Parses an ISO8601 formatted string a returns a Date instance.
+     * Parses an ISO8601 formatted string a returns an Instant instance.
      * 
      * @param dateTimeString the ISO8601 formatted string
-     * @return a Date instance for the ISO8601 formatted string
+     * @return an Instant instance for the ISO8601 formatted string
      * @throws ParseException if the provided string is not in the proper format
      */
-    public static Date toDate(String dateTimeString) throws ParseException {
+    public static Instant toInstant(String dateTimeString) throws ParseException {
 
         if (dateTimeString == null) {
             return (null);
         }
 
         dateTimeString = dateTimeString.trim();
-        if (dateTimeString.endsWith("UTC")) {
-            return (SafeDateFormatter.getDateFormat(UTC_PATTERN).parse(dateTimeString));
+        if (dateTimeString.endsWith("Z") || dateTimeString.endsWith("UTC")) {
+            return (Instant.parse(dateTimeString));
         } else {
-            try {
-                Calendar cal = DatatypeConverter.parseDateTime(dateTimeString);
-                return (cal.getTime());
-            } catch (Exception e) {
-                if (dateTimeString.matches(PATTERN_REGEX)) {
-                    // Try using the ISO8601 format
-                    return (SafeDateFormatter.getDateFormat(PATTERN).parse(dateTimeString));
-                } else if (dateTimeString.matches(SPACEY_PATTERN_REGEX)) {
-                    // Try using the invalid ISO8601 format with spaces, GitLab sometimes uses this
-                    return (SafeDateFormatter.getDateFormat(SPACEY_PATTERN).parse(dateTimeString));
-                } else {
-                    throw e;
-                }
-            }
+
+            OffsetDateTime odt = (dateTimeString.length() > 25 ?
+                OffsetDateTime.parse(dateTimeString, ODT_WITH_MSEC_PARSER) :
+                OffsetDateTime.parse(dateTimeString, ODT_PARSER));
+
+            return (odt.toInstant());
         }
     }
 
+    /**
+     * Parses an ISO8601 formatted string a returns a Date instance.
+     *
+     * @param dateTimeString the ISO8601 formatted string
+     * @return a Date instance for the ISO8601 formatted string
+     * @throws ParseException if the provided string is not in the proper format
+     */
+    public static Date toDate(String dateTimeString) throws ParseException {
+        Instant instant = toInstant(dateTimeString);
+        return (instant != null ? Date.from(instant) : null);
+    }
+
     /**
      * Parses an ISO8601 formatted string a returns a Calendar instance.
      * 
@@ -159,6 +174,10 @@ public static Date toDate(String dateTimeString) throws ParseException {
     public static Calendar toCalendar(String dateTimeString) throws ParseException {
 
         Date date = toDate(dateTimeString);
+        if (date == null) {
+            return (null);
+        }
+
         Calendar cal = Calendar.getInstance();
         cal.setTime(date);
         return (cal);