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CS2335/lab4/src/netpaint/messaging/AdministrativeMessage.java

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+package netpaint.messaging;
+
+import java.util.StringTokenizer;
+
+/**
+ * Class AdministrativeMessage: This class extends Client Message and
+ * is the base for all administrative network messages that will be
+ * sent by the client. All of the more specific client message classes
+ * will be derived from it and will add more and more spcific
+ * functionality onto the basics provided in this class.
+ *
+ * <PRE>
+ * Revision History:
+ *     v1.0 (Jan. 29, 2004) - Created the AdministrativeMessage class
+ * </PRE>
+ *
+ * @author <A HREF="mailto:gtg563g@mail.gatech.edu">Daniyar Zhanbekov</A>
+ * @version Version 1.0, Jan. 29, 2004
+ */
+
+public abstract class AdministrativeMessage extends ClientMessage {
+  /**
+   * Creates a new <code>AdministrativeMessage</code> instance.
+   *
+   * @param type a <code>String</code> value
+   * @param author a <code>String</code> value
+   */
+  public AdministrativeMessage(final String type, final String author) {
+      super(type, author);
+  }
+
+  /**
+   * Returns a string representation of the message fit for plain-text
+   * transmission over the network.
+   *
+   * @return a <code>String</code> value
+   */
+  public final String tokenize() {
+    return getMessageType() + ":" + getAuthor();
+  }
+
+  /**
+   * Parses the string into the specific message.
+   *
+   * @param message a <code>String</code> value
+   * @return an <code>AbstractMessage</code> value
+   */
+  protected static AbstractMessage parse(final String message) {
+    String type = getMessageType(message);
+    StringTokenizer st = null;
+
+    if (type == null) {
+      return null;
+    }
+
+    if (!(type.equals(MessageSettings.JOIN_TYPE)
+          || type.equals(MessageSettings.QUIT_TYPE))) {
+      return null;
+    }
+
+    st = new StringTokenizer(message, ":");
+
+    //Message type:
+    if (!st.hasMoreTokens()) { return null; }
+    type = st.nextToken();
+
+    //Username:
+    if (!st.hasMoreTokens()) { return null; }
+    if (type.equals(MessageSettings.JOIN_TYPE)) {
+      return new JoinMessage(st.nextToken());
+    } else if (type.equals(MessageSettings.QUIT_TYPE)) {
+      return new QuitMessage(st.nextToken());
+    }
+
+    return null;
+  }
+}