[W8.6b][W13-B1] Alicia Ho Sor Sian

src/seedu/addressbook/data/AddressBook.java

@@ -1,5 +1,6 @@
 package seedu.addressbook.data;
 
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
@@ -24,13 +25,15 @@ public class AddressBook {
 
     private final UniquePersonList allPersons;
     private final UniqueTagList allTags; // can contain tags not attached to any person
+    private final ArrayList<Tagging> allTaggings;
 
     /**
      * Creates an empty address book.
      */
     public AddressBook() {
         allPersons = new UniquePersonList();
         allTags = new UniqueTagList();
+        allTaggings= new ArrayList<>();
     }
 
     /**
@@ -46,6 +49,7 @@ public AddressBook(UniquePersonList persons, UniqueTagList tags) {
         for (Person p : allPersons) {
             syncTagsWithMasterList(p);
         }
+        allTaggings = new ArrayList<>();
     }
 
     /**
@@ -121,6 +125,18 @@ public UniqueTagList getAllTags() {
         return new UniqueTagList(allTags);
     }
 
+    /**
+     * Returns message containing all Tagging messages in current session of AddressBook.
+     */
+    public String getAllTaggings() {
+        StringBuilder builder = new StringBuilder();
+        for(Tagging t: allTaggings) {
+            builder.append(t.getTaggingMessage());
+            builder.append("\n");
+        }
+        return builder.toString().trim();
+    }
+
     @Override
     public boolean equals(Object other) {
         return other == this // short circuit if same object

src/seedu/addressbook/data/Tagging.java

@@ -0,0 +1,42 @@
+package seedu.addressbook.data;
+
+import seedu.addressbook.data.exception.IllegalValueException;
+import seedu.addressbook.data.person.Person;
+import seedu.addressbook.data.tag.Tag;
+
+/**
+ * Represents the adding or deleting a Tag to a Person.
+ */
+public class Tagging {
+    private static final String DELETE_SYMBOL = "-";
+    private static final String ADD_SYMBOL = "+";
+    private static final String MESSAGE_CONSTRAINTS = "Action Executed message can only be \"delete\" or \"add\".";
+    private static final String DELETE_ACTION  = "delete";
+    private static final String ADD_ACTION = "add";
+
+
+    public final Person person;
+    public final Tag tag;
+    public final String actionTaken;
+
+    public Tagging (Person person, Tag tag, String actionExecuted) throws IllegalValueException {
+        this.person = person;
+        this.tag = tag;
+        if (actionExecuted.equals(DELETE_ACTION)) {
+            actionTaken = DELETE_SYMBOL;
+        }
+        else if (actionExecuted.equals(ADD_ACTION)) {
+            actionTaken = ADD_SYMBOL;
+        }
+        else {
+            throw new IllegalValueException(MESSAGE_CONSTRAINTS);
+        }
+    }
+
+    /**
+     *  Returns Tagging message.
+     */
+    public String getTaggingMessage () {
+        return actionTaken + " " + person.getName().toString() + " " + tag.toString();
+    }
+}