Get start and end date time of an event formatted using a pattern

ccm-cms/src/main/java/org/librecms/pages/models/EventModel.java

@@ -18,13 +18,9 @@
  */
 package org.librecms.pages.models;
 
-import org.libreccm.l10n.GlobalizationHelper;
+import java.time.LocalDateTime;
-import org.librecms.contentsection.ContentItem;
-import org.librecms.contenttypes.Event;
-
 import java.time.ZoneId;
 import java.time.format.DateTimeFormatter;
-import java.util.Date;
 import java.util.Optional;
 
 import javax.enterprise.context.RequestScoped;
@@ -32,6 +28,10 @@ import javax.inject.Inject;
 import javax.inject.Named;
 import javax.transaction.Transactional;
 
+import org.libreccm.l10n.GlobalizationHelper;
+import org.librecms.contentsection.ContentItem;
+import org.librecms.contenttypes.Event;
+
 /**
  *
  * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
@@ -48,15 +48,13 @@ public class EventModel implements ProcessesContentItem {
 
     private boolean initialized;
 
-    private final DateTimeFormatter isoDateTimeFormatter;
-
     private String title;
 
     private String text;
 
-    private String startDateTime;
+    private LocalDateTime startDateTime;
 
-    private String endDateTime;
+    private LocalDateTime endDateTime;
 
     private String eventDate;
 
@@ -66,8 +64,6 @@ public class EventModel implements ProcessesContentItem {
 
     public EventModel() {
         initialized = false;
-        isoDateTimeFormatter = DateTimeFormatter.ISO_DATE_TIME
-            .withZone(ZoneId.systemDefault());
     }
 
     @Transactional(Transactional.TxType.REQUIRED)
@@ -85,19 +81,97 @@ public class EventModel implements ProcessesContentItem {
     }
 
     @Transactional(Transactional.TxType.REQUIRED)
-    public String getStartDateTime() {
+    public LocalDateTime getStartDateTime() {
         contentItemModel.init();
 
         return startDateTime;
     }
 
+    /**
+     * Returns the start date of the event represented by this model formatted
+     * using the provided pattern. The pattern MUST be a valid pattern for
+     * {@link DateTimeFormatter#ofPattern(java.lang.String) }.
+     *
+     * @param pattern The pattern to use for formatting the release date.
+     * 
+     * @return The formatted release date.
+     */
+    public String getStartDateTime(final String pattern) {
+        contentItemModel.init();
+
+        return Optional
+            .ofNullable(startDateTime)
+            .map(
+                dateTime -> DateTimeFormatter
+                    .ofPattern(
+                        pattern, 
+                        globalizationHelper.getNegotiatedLocale()
+                    )
+                    .withZone(ZoneId.systemDefault())
+                    .format(dateTime)
+            )
+            .orElse("");
+    }
+
+    public String getStartDateTimeAsString() {
+        contentItemModel.init();
+
+        return Optional
+            .ofNullable(endDateTime)
+            .map(
+                dateTime -> DateTimeFormatter.ISO_DATE_TIME
+                    .withZone(ZoneId.systemDefault())
+                    .format(dateTime)
+            )
+            .orElse("");
+    }
+
     @Transactional(Transactional.TxType.REQUIRED)
-    public String getEndDateTime() {
+    public LocalDateTime getEndDateTime() {
         contentItemModel.init();
 
         return endDateTime;
     }
 
+    /**
+     * Returns the end date of the event represented by this model formatted
+     * using the provided pattern. The pattern MUST be a valid pattern for
+     * {@link DateTimeFormatter#ofPattern(java.lang.String) }.
+     *
+     * @param pattern The pattern to use for formatting the release date.
+     * 
+     * @return The formatted release date.
+     */
+    public String getEndDateTime(final String pattern) {
+        contentItemModel.init();
+
+        return Optional
+            .ofNullable(endDateTime)
+            .map(
+                dateTime -> DateTimeFormatter
+                    .ofPattern(
+                        pattern, 
+                        globalizationHelper.getNegotiatedLocale()
+                    )
+                    .withZone(ZoneId.systemDefault())
+                    .format(dateTime)
+            )
+            .orElse("");
+    }
+
+    public String getEndDateTimeAsString() {
+        contentItemModel.init();
+
+        return Optional
+            .ofNullable(endDateTime)
+            .map(
+                dateTime -> DateTimeFormatter.ISO_DATE_TIME
+                    .withZone(ZoneId.systemDefault())
+                    .format(dateTime)
+            )
+        .orElse("");
+    }
+
     @Transactional(Transactional.TxType.REQUIRED)
     public String getEventDate() {
         contentItemModel.init();
@@ -139,14 +213,20 @@ public class EventModel implements ProcessesContentItem {
                 .orElse("");
             startDateTime = Optional
                 .ofNullable(event.getStartDate())
-                .map(Date::toInstant)
+                .map(
-                .map(isoDateTimeFormatter::format)
+                    startDate -> LocalDateTime.from(
-                .orElse("");
+                        startDate.toInstant().atZone(ZoneId.systemDefault())
+                    )
+                )
+                .orElse(null);
             endDateTime = Optional
                 .ofNullable(event.getEndDate())
-                .map(Date::toInstant)
+                .map(
-                .map(isoDateTimeFormatter::format)
+                    endDate -> LocalDateTime.from(
-                .orElse("");
+                        endDate.toInstant().atZone(ZoneId.systemDefault())
+                    )
+                )
+                .orElse(null);
             eventDate = Optional
                 .ofNullable(event.getEventDate())
                 .map(globalizationHelper::getValueFromLocalizedString)