Merge pull request nusCS2113-AY1920S1#21 from VirginiaYu/B-DoAfterTasks

B-DoAfterTasks

src/main/java/duke/task/DoAfter.java

@@ -0,0 +1,65 @@
+package duke.task;
+import java.text.SimpleDateFormat;
+import java.time.LocalDate;
+import java.time.ZoneId;
+import java.util.Date;
+
+/**
+ * Represents a special task that {@link Task } specified by the due {@link Date}
+ */
+public class DoAfter extends Task{
+
+    private String after;
+    private Date date;
+
+    /**
+     * CONSTRUCTOR
+     * by specifying the description of this task
+     * and the description of the task
+     * after which this task need to be done
+     */
+    public DoAfter(String description, Task todo) {
+        super(description);
+        this.after = todo.getDescription();
+    }
+
+    /**
+     * CONSTRUCTOR
+     * by specifying the description of this task
+     * and the date/time after which this task need to be done
+     */
+    public DoAfter(String description, String after) {
+        super(description);
+        this.after = after;
+        this.date = super.getDate(after);
+    }
+
+    @Override
+    public String toString() {
+        return (date == null) ? "[A]" + super.toString() + "(after: " + after + ")" : "[A]" + super.toString() + "(after: " + getDateString(date) + ")";
+    }
+
+    /**
+     * Returns the {@link Date } instance as a String to be printed in the file
+     * @param date deadline {@link Date} for finishing the task
+     * @return String the date for the deadline
+     */
+    private String getDateString(Date date) {
+        if (date == null)
+            return after;
+        LocalDate localDate = date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
+        String pattern = after.length() > 11 ? "d'" + getDaySuffix(localDate.getDayOfMonth()) + "' 'of' MMMM yyyy, ha " : "d'" + getDaySuffix(localDate.getDayOfMonth()) + "' 'of' MMMM yyyy";
+        SimpleDateFormat formatter = new SimpleDateFormat(pattern);
+        return formatter.format(date);
+    }
+
+    /**
+     * Returns the String representation of the {@link Deadline} in format compatible to be easily read and written in a text file on the hard disc
+     * @return String used to print the {@link Task } in the text file
+     */
+    public String printInFile() {
+        return this.isDone() ? "A|1|" + this.getDescription() + "| after" + this.after : "A|0|" + this.getDescription() + "| after" + this.after;
+    }
+
+
+}