upd: rename package name and all references to it

[gigi.git] / src / club / wpia / gigi / util / DayDate.java

diff --git a/src/club/wpia/gigi/util/DayDate.java b/src/club/wpia/gigi/util/DayDate.java
new file mode 100644 (file)
index 0000000..8ade342
--- /dev/null
+++ b/src/club/wpia/gigi/util/DayDate.java
@@ -0,0 +1,78 @@
+package club.wpia.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 (null == obj) {
+            return false;
+        }
+        if ( !(obj instanceof DayDate)) {
+            throw new Error("You may not compare this date somthing other than a DayDate");
+        }
+        return ((DayDate) obj).time == time;
+    }
+
+    @Override
+    public int hashCode() {
+        return Long.hashCode(time);
+    }
+
+    public java.util.Date toDate() {
+        return new java.util.Date(time);
+    }
+}