Add Ability to Delete Messages Locally (#70)

Merge branch 'develop' into f/delete-messages
Additionally added system commands to copy, delete or save attachments of selected messages

Reviewed-on: https://git.kske.dev/zdm/envoy/pulls/70
Reviewed-by: kske <kai@kske.dev>
Reviewed-by: DieGurke <maxi@kske.dev>

client/src/main/java/envoy/client/data/Chat.java

@@ -74,7 +74,7 @@ public class Chat implements Serializable {
 	public boolean equals(Object obj) {
 		if (this == obj) return true;
 		if (!(obj instanceof Chat)) return false;
-		final Chat other = (Chat) obj;
+		final var other = (Chat) obj;
 		return Objects.equals(recipient, other.recipient);
 	}
 
@@ -89,7 +89,7 @@ public class Chat implements Serializable {
 	 */
 	public void read(WriteProxy writeProxy) {
 		for (int i = messages.size() - 1; i >= 0; --i) {
-			final Message m = messages.get(i);
+			final var m = messages.get(i);
 			if (m.getSenderID() == recipient.getID()) if (m.getStatus() == MessageStatus.READ) break;
 			else {
 				m.setStatus(MessageStatus.READ);
@@ -121,6 +121,15 @@ public class Chat implements Serializable {
 		messages.add(0, message);
 	}
 
+	/**
+	 * Removes the message with the given ID.
+	 *
+	 * @param messageID the ID of the message to remove
+	 * @return whether the message has been found and removed
+	 * @since Envoy Client v0.3-beta
+	 */
+	public boolean remove(long messageID) { return messages.removeIf(m -> m.getID() == messageID); }
+
 	/**
 	 * Increments the amount of unread messages.
 	 *

client/src/main/java/envoy/client/data/LocalDB.java

@@ -7,6 +7,7 @@ import java.time.Instant;
 import java.util.*;
 import java.util.logging.*;
 
+import javafx.application.Platform;
 import javafx.collections.*;
 
 import envoy.client.event.*;
@@ -273,6 +274,24 @@ public final class LocalDB implements EventListener {
 		cacheMap.clear();
 	}
 
+	/**
+	 * Deletes the message with the given ID, if present.
+	 *
+	 * @param message the event that was
+	 * @since Envoy Client v0.3-beta
+	 */
+	@Event
+	private void onMessageDeletion(MessageDeletion message) {
+		Platform.runLater(() -> {
+
+			// We suppose that messages have unique IDs, hence the search can be stopped
+			// once a message was removed
+			final var messageID = message.get();
+			for (final var chat : chats)
+				if (chat.remove(messageID)) break;
+		});
+	}
+
 	/**
 	 * @return a {@code Map<String, User>} of all users stored locally with their
 	 *         user names as keys