Move connection establishing logic into its own handler.

[xudocci.git] / src / main / java / net / pterodactylus / irc / connection / ConnectionEstablishHandler.java

diff --git a/src/main/java/net/pterodactylus/irc/connection/ConnectionEstablishHandler.java b/src/main/java/net/pterodactylus/irc/connection/ConnectionEstablishHandler.java
new file mode 100644 (file)
index 0000000..da608ca
--- /dev/null
+++ b/src/main/java/net/pterodactylus/irc/connection/ConnectionEstablishHandler.java
@@ -0,0 +1,70 @@
+package net.pterodactylus.irc.connection;
+
+import static java.util.Arrays.asList;
+
+import net.pterodactylus.irc.Connection;
+import net.pterodactylus.irc.Reply;
+import net.pterodactylus.irc.event.ConnectionEstablished;
+
+import com.google.common.eventbus.EventBus;
+
+/**
+ * Handles the necessary commands that establish a connection.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class ConnectionEstablishHandler implements Handler {
+
+       private static final int FIRST_COMMAND_RECEIVED = 0x01;
+       private static final int SECOND_COMMAND_RECEIVED = 0x02;
+       private static final int THIRD_COMMAND_RECEIVED = 0x04;
+       private static final int FOURTH_COMMAND_RECEIVED = 0x08;
+       private static final int ALL_COMMANDS_RECEIVED = 0x0f;
+
+       private final EventBus eventBus;
+       private final Connection connection;
+       private int connectionStatus;
+       private int oldConnectionStatus;
+
+       public ConnectionEstablishHandler(EventBus eventBus,
+                       Connection connection) {
+               this.eventBus = eventBus;
+               this.connection = connection;
+       }
+
+       @Override
+       public boolean willHandle(Reply reply) {
+               return asList("001", "002", "003", "004").contains(reply.command());
+       }
+
+       @Override
+       public void handleReply(Reply reply) {
+               String command = reply.command();
+               /* replies 001-004 don’t hold information but they
+                * have to be sent on a successful connection. */
+               if (command.equals("001")) {
+                       connectionStatus |= FIRST_COMMAND_RECEIVED;
+               } else if (command.equals("002")) {
+                       connectionStatus |= SECOND_COMMAND_RECEIVED;
+               } else if (command.equals("003")) {
+                       connectionStatus |= THIRD_COMMAND_RECEIVED;
+               } else if (command.equals("004")) {
+                       connectionStatus |= FOURTH_COMMAND_RECEIVED;
+               }
+
+               if (hasConnectionStatusChanged()
+                               && isFinalConnectionStatusReached()) {
+                       eventBus.post(new ConnectionEstablished(connection));
+               }
+               oldConnectionStatus = connectionStatus;
+       }
+
+       private boolean hasConnectionStatusChanged() {
+               return connectionStatus != oldConnectionStatus;
+       }
+
+       private boolean isFinalConnectionStatusReached() {
+               return connectionStatus == ALL_COMMANDS_RECEIVED;
+       }
+
+}