[W8.6b][T11-B1] Eka Buyung Lienadi

src/seedu/addressbook/data/Tagging/Tagging.java

@@ -0,0 +1,95 @@
+package seedu.addressbook.data.Tagging;
+
+import seedu.addressbook.data.person.Person;
+import seedu.addressbook.data.tag.Tag;
+
+import java.util.ArrayList;
+
+/**
+ * Records recently created and deleted Taggings.
+ * Tagging represents an association between a person and a tag.
+ */
+public class Tagging {
+
+    public static final int INVALID_INDEX = -1;
+    /**
+     * Lists all taggings as a String.
+     */
+    public static ArrayList<Tagging> uniqueTaggingList;
+    public static ArrayList<String> toBePrintedTaggings;
+
+    private Person person;
+    private Tag tag;
+
+    /**
+     * Constructs a Tagging object.
+     * new taggings are recorded in {@code} toBePrintedTaggings.
+     */
+    Tagging(Person person, Tag tag) {
+        this.person = person;
+        this.tag = tag;
+        recordNewTagging(person, tag);
+    }
+
+    @Override
+    /**
+     * Records recently removed taggings.
+     */
+    protected void finalize() {
+        recordDeletedTagging();
+    }
+
+    /**
+     * @return the printable form of all added/deleted taggings.
+     */
+    public static String getPrintableResult() {
+        String printableTaggings = new String();
+
+        for (String tagging : toBePrintedTaggings) {
+            printableTaggings = tagging + "\n";
+        }
+        return printableTaggings;
+    }
+
+    /**
+     * Clears all element in the printable list.
+     */
+    public static void reset() {
+        toBePrintedTaggings.clear();
+    }
+
+    private void recordDeletedTagging() {
+        toBePrintedTaggings.add("- " + person.getName().toString() + " " + tag.toString());
+        uniqueTaggingList.remove(getTargetIndex());
+    }
+
+    /**
+     * @return index of tagging that will be removed.
+     * @return INVALID_INDEX if tagging does not exist.
+     */
+    private int getTargetIndex() {
+        for (int i = 0; i < uniqueTaggingList.size(); i++) {
+            if(isSame(i)) {
+                return i;
+            }
+        }
+        return INVALID_INDEX;
+    }
+
+    private boolean isSame(int i) {
+        return uniqueTaggingList.get(i).getPerson() == person && uniqueTaggingList.get(i).getTag() == tag;
+    }
+
+    private void recordNewTagging(Person person, Tag tag) {
+        uniqueTaggingList.add(new Tagging(person, tag));
+        toBePrintedTaggings.add("+ " + person.getName().toString() + " " + tag.toString());
+    }
+
+    public Person getPerson() {
+        return person;
+    }
+
+    public Tag getTag() {
+        return tag;
+    }
+}