[W8.6b][T09-B3] Kang Anmin

src/seedu/addressbook/commands/ExitCommand.java

@@ -1,5 +1,9 @@
 package seedu.addressbook.commands;
 
+import java.util.Arrays;
+import seedu.addressbook.data.AddressBook;
+import seedu.addressbook.data.tag.Tagging;
+
 /**
  * Terminates the program.
  */
@@ -13,7 +17,14 @@ public class ExitCommand extends Command {
 
     @Override
     public CommandResult execute() {
-        return new CommandResult(MESSAGE_EXIT_ACKNOWEDGEMENT);
+
+        StringBuffer tagLog = new StringBuffer();
+
+        for(Tagging tagging: addressBook.tagLog) {
+            tagLog.append(tagging.toString() + "\n");
+        }
+
+        return new CommandResult(tagLog + MESSAGE_EXIT_ACKNOWEDGEMENT);
     }
 
     public static boolean isExit(Command command) {

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;
@@ -11,6 +12,7 @@
 import seedu.addressbook.data.person.UniquePersonList.DuplicatePersonException;
 import seedu.addressbook.data.person.UniquePersonList.PersonNotFoundException;
 import seedu.addressbook.data.tag.Tag;
+import seedu.addressbook.data.tag.Tagging;
 import seedu.addressbook.data.tag.UniqueTagList;
 
 /**
@@ -24,13 +26,15 @@ public class AddressBook {
 
     private final UniquePersonList allPersons;
     private final UniqueTagList allTags; // can contain tags not attached to any person
+    public ArrayList<Tagging> tagLog;
 
     /**
      * Creates an empty address book.
      */
     public AddressBook() {
         allPersons = new UniquePersonList();
         allTags = new UniqueTagList();
+        tagLog = new ArrayList<Tagging>();
     }
 
     /**
@@ -46,6 +50,7 @@ public AddressBook(UniquePersonList persons, UniqueTagList tags) {
         for (Person p : allPersons) {
             syncTagsWithMasterList(p);
         }
+        tagLog = new ArrayList<Tagging>();
     }
 
     /**

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

@@ -0,0 +1,28 @@
+package seedu.addressbook.data.tag;
+
+import seedu.addressbook.data.person.Person;
+
+/**
+ * It records a transaction of a tag addition/deletion
+ */
+public class Tagging {
+    private Person person;
+    private Tag tag;
+    private boolean addition; // true means it is an addition, false means deletion
+
+    /**
+     * Constructs a tagging with the given data.
+     *
+     * @param person the person whose tag was added/deleted in the last transaction
+     * @param tag the tag added/deleted in the last transaction
+     */
+    public Tagging(Person person, Tag tag, boolean addition) {
+        this.person = person;
+        this.tag = tag;
+        this.addition = addition;
+    }
+
+    public String toString() {
+        return (addition?"+ ":"- ") + person.getName() + " " + tag.toString();
+    }
+}