restructure conversation item classes

briar-android/src/org/briarproject/android/contact/ConversationMessageOutItem.java

@@ -0,0 +1,43 @@
+package org.briarproject.android.contact;
+
+import org.briarproject.api.messaging.PrivateMessageHeader;
+
+// This class is not thread-safe
+public class ConversationMessageOutItem extends ConversationMessageItem
+		implements ConversationItem.OutgoingItem {
+
+	private boolean sent, seen;
+
+	public ConversationMessageOutItem(PrivateMessageHeader header) {
+		super(header);
+
+		sent = header.isSent();
+		seen = header.isSeen();
+	}
+
+	@Override
+	int getType() {
+		return MSG_OUT;
+	}
+
+	@Override
+	public boolean isSent() {
+		return sent;
+	}
+
+	@Override
+	public void setSent(boolean sent) {
+		this.sent = sent;
+	}
+
+	@Override
+	public boolean isSeen() {
+		return seen;
+	}
+
+	@Override
+	public void setSeen(boolean seen) {
+		this.seen = seen;
+	}
+
+}