+package org.cacert.gigi.util;
+
+import java.sql.Date;
+
+/**
+ * This Class consists of a millisecond timestamp that is only interesting up to
+ * day-precision.
+ */
+public class DayDate {
+
+ public static final long MILLI_DAY = 24 * 60 * 60 * 1000;
+
+ private long time;
+
+ /**
+ * Creates a new {@link DayDate} from the SQL Day-exact variant {@link Date}
+ * .
+ *
+ * @see #toSQLDate()
+ */
+ public DayDate(Date date) {
+ this(date.getTime());
+ }
+
+ /**
+ * Creates a new {@link DayDate} based on the given millisecond timestamp.
+ *
+ * @param millis
+ * the timestamp to create the Date from.
+ * @throws IllegalArgumentException
+ * if the parameter contains more precision than needed.
+ */
+ public DayDate(long millis) {
+ this.time = millis;
+ if (millis % MILLI_DAY != 0) {
+ throw new IllegalArgumentException();
+ }
+ }
+
+ /**
+ * Gets the enclosed timestamp.
+ *
+ * @return the enclosed timestamp.
+ */
+ public long getTime() {
+ return time;
+ }
+
+ /**
+ * Converts this DayDate to an {@link Date}.
+ *
+ * @return the corresponding {@link Date}
+ * @see #DayDate(Date)
+ */
+ public Date toSQLDate() {
+ return new Date(time);
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if ( !(obj instanceof DayDate)) {
+ throw new Error("You may not compare this date somthing other than a DayDate");
+ }
+ return ((DayDate) obj).time == time;
+ }
+
+ public java.util.Date toDate() {
+ return new java.util.Date(time);
+ }
+}
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