Use .isEmpty() for checking lists and strings

lib/src/main/java/org/asamk/signal/manager/api/GroupInviteLinkUrl.java

@@ -39,13 +39,13 @@ public final class GroupInviteLinkUrl {
         }
 
         try {
-            if (!"/".equals(uri.getPath()) && uri.getPath().length() > 0) {
+            if (!"/".equals(uri.getPath()) && !uri.getPath().isEmpty()) {
                 throw new InvalidGroupLinkException("No path was expected in uri");
             }
 
             var encoding = uri.getFragment();
 
-            if (encoding == null || encoding.length() == 0) {
+            if (encoding == null || encoding.isEmpty()) {
                 throw new InvalidGroupLinkException("No reference was in the uri");
             }
 

lib/src/main/java/org/asamk/signal/manager/helper/GroupHelper.java

@@ -594,14 +594,14 @@ public class GroupHelper {
         if (members != null) {
             final var requestingMembers = new HashSet<>(members);
             requestingMembers.retainAll(group.getRequestingMembers());
-            if (requestingMembers.size() > 0) {
+            if (!requestingMembers.isEmpty()) {
                 var groupGroupChangePair = groupV2Helper.approveJoinRequestMembers(group, requestingMembers);
                 result = sendUpdateGroupV2Message(group, groupGroupChangePair.first(), groupGroupChangePair.second());
             }
             final var newMembers = new HashSet<>(members);
             newMembers.removeAll(group.getMembers());
             newMembers.removeAll(group.getRequestingMembers());
-            if (newMembers.size() > 0) {
+            if (!newMembers.isEmpty()) {
                 var groupGroupChangePair = groupV2Helper.addMembers(group, newMembers);
                 result = sendUpdateGroupV2Message(group, groupGroupChangePair.first(), groupGroupChangePair.second());
             }
@@ -617,20 +617,20 @@ public class GroupHelper {
                 existingRemoveMembers.removeAll(members);
             }
             existingRemoveMembers.remove(account.getSelfRecipientId());// self can be removed with sendQuitGroupMessage
-            if (existingRemoveMembers.size() > 0) {
+            if (!existingRemoveMembers.isEmpty()) {
                 var groupGroupChangePair = groupV2Helper.removeMembers(group, existingRemoveMembers);
                 result = sendUpdateGroupV2Message(group, groupGroupChangePair.first(), groupGroupChangePair.second());
             }
 
             var pendingRemoveMembers = new HashSet<>(removeMembers);
             pendingRemoveMembers.retainAll(group.getPendingMembers());
-            if (pendingRemoveMembers.size() > 0) {
+            if (!pendingRemoveMembers.isEmpty()) {
                 var groupGroupChangePair = groupV2Helper.revokeInvitedMembers(group, pendingRemoveMembers);
                 result = sendUpdateGroupV2Message(group, groupGroupChangePair.first(), groupGroupChangePair.second());
             }
             var requestingRemoveMembers = new HashSet<>(removeMembers);
             requestingRemoveMembers.retainAll(group.getRequestingMembers());
-            if (requestingRemoveMembers.size() > 0) {
+            if (!requestingRemoveMembers.isEmpty()) {
                 var groupGroupChangePair = groupV2Helper.refuseJoinRequestMembers(group, requestingRemoveMembers);
                 result = sendUpdateGroupV2Message(group, groupGroupChangePair.first(), groupGroupChangePair.second());
             }
@@ -640,7 +640,7 @@ public class GroupHelper {
             final var newAdmins = new HashSet<>(admins);
             newAdmins.retainAll(group.getMembers());
             newAdmins.removeAll(group.getAdminMembers());
-            if (newAdmins.size() > 0) {
+            if (!newAdmins.isEmpty()) {
                 for (var admin : newAdmins) {
                     var groupGroupChangePair = groupV2Helper.setMemberAdmin(group, admin, true);
                     result = sendUpdateGroupV2Message(group,
@@ -653,7 +653,7 @@ public class GroupHelper {
         if (removeAdmins != null) {
             final var existingRemoveAdmins = new HashSet<>(removeAdmins);
             existingRemoveAdmins.retainAll(group.getAdminMembers());
-            if (existingRemoveAdmins.size() > 0) {
+            if (!existingRemoveAdmins.isEmpty()) {
                 for (var admin : existingRemoveAdmins) {
                     var groupGroupChangePair = groupV2Helper.setMemberAdmin(group, admin, false);
                     result = sendUpdateGroupV2Message(group,
@@ -666,7 +666,7 @@ public class GroupHelper {
         if (banMembers != null) {
             final var newlyBannedMembers = new HashSet<>(banMembers);
             newlyBannedMembers.removeAll(group.getBannedMembers());
-            if (newlyBannedMembers.size() > 0) {
+            if (!newlyBannedMembers.isEmpty()) {
                 var groupGroupChangePair = groupV2Helper.banMembers(group, newlyBannedMembers);
                 result = sendUpdateGroupV2Message(group, groupGroupChangePair.first(), groupGroupChangePair.second());
             }
@@ -675,7 +675,7 @@ public class GroupHelper {
         if (unbanMembers != null) {
             var existingUnbanMembers = new HashSet<>(unbanMembers);
             existingUnbanMembers.retainAll(group.getBannedMembers());
-            if (existingUnbanMembers.size() > 0) {
+            if (!existingUnbanMembers.isEmpty()) {
                 var groupGroupChangePair = groupV2Helper.unbanMembers(group, existingUnbanMembers);
                 result = sendUpdateGroupV2Message(group, groupGroupChangePair.first(), groupGroupChangePair.second());
             }
@@ -745,7 +745,7 @@ public class GroupHelper {
         if (currentAdmins.contains(account.getSelfRecipientId())
                 && currentAdmins.size() == 1
                 && groupInfoV2.getMembers().size() > 1
-                && newAdmins.size() == 0) {
+                && newAdmins.isEmpty()) {
             // Last admin can't leave the group, unless she's also the last member
             throw new LastGroupAdminException(groupInfoV2.getGroupId(), groupInfoV2.getTitle());
         }

lib/src/main/java/org/asamk/signal/manager/helper/SendHelper.java

@@ -465,7 +465,7 @@ public class SendHelper {
                 : getSenderKeyCapableRecipientIds(recipientIds);
         final var allResults = new ArrayList<SendMessageResult>(recipientIds.size());
 
-        if (senderKeyTargets.size() > 0) {
+        if (!senderKeyTargets.isEmpty()) {
             final var results = sendGroupMessageInternalWithSenderKey(senderKeySender,
                     senderKeyTargets,
                     distributionId,
@@ -479,7 +479,7 @@ public class SendHelper {
                         .filter(r -> !r.isSuccess())
                         .map(r -> context.getRecipientHelper().resolveRecipient(r.getAddress()))
                         .toList();
-                if (failedTargets.size() > 0) {
+                if (!failedTargets.isEmpty()) {
                     senderKeyTargets = new HashSet<>(senderKeyTargets);
                     failedTargets.forEach(senderKeyTargets::remove);
                 }
@@ -490,8 +490,8 @@ public class SendHelper {
         legacyTargets.removeAll(senderKeyTargets);
         final boolean onlyTargetIsSelfWithLinkedDevice = recipientIds.isEmpty() && account.isMultiDevice();
 
-        if (legacyTargets.size() > 0 || onlyTargetIsSelfWithLinkedDevice) {
+        if (!legacyTargets.isEmpty() || onlyTargetIsSelfWithLinkedDevice) {
-            if (legacyTargets.size() > 0) {
+            if (!legacyTargets.isEmpty()) {
                 logger.debug("Need to do {} legacy sends.", legacyTargets.size());
             } else {
                 logger.debug("Need to do a legacy send to send a sync message for a group of only ourselves.");
@@ -499,7 +499,7 @@ public class SendHelper {
 
             final List<SendMessageResult> results = sendGroupMessageInternalWithLegacy(legacySender,
                     legacyTargets,
-                    isRecipientUpdate || allResults.size() > 0);
+                    isRecipientUpdate || !allResults.isEmpty());
             allResults.addAll(results);
         }
         final var duration = Duration.ofMillis(System.currentTimeMillis() - startTime);

lib/src/main/java/org/asamk/signal/manager/helper/StorageHelper.java

@@ -298,7 +298,7 @@ public class StorageHelper {
             logger.warn("Failed to read storage records, ignoring.");
             return null;
         }
-        return records.size() > 0 ? records.get(0) : null;
+        return !records.isEmpty() ? records.get(0) : null;
     }
 
     private List<SignalStorageRecord> getSignalStorageRecords(final Collection<StorageId> storageIds) throws IOException {

lib/src/main/java/org/asamk/signal/manager/internal/ManagerImpl.java

@@ -663,13 +663,13 @@ public class ManagerImpl implements Manager {
         } else {
             messageBuilder.withBody(message.messageText());
         }
-        if (message.attachments().size() > 0) {
+        if (!message.attachments().isEmpty()) {
             messageBuilder.withAttachments(context.getAttachmentHelper().uploadAttachments(message.attachments()));
         }
-        if (message.mentions().size() > 0) {
+        if (!message.mentions().isEmpty()) {
             messageBuilder.withMentions(resolveMentions(message.mentions()));
         }
-        if (message.textStyles().size() > 0) {
+        if (!message.textStyles().isEmpty()) {
             messageBuilder.withBodyRanges(message.textStyles().stream().map(TextStyle::toBodyRange).toList());
         }
         if (message.quote().isPresent()) {
@@ -715,7 +715,7 @@ public class ManagerImpl implements Manager {
                     manifestSticker.emoji(),
                     AttachmentUtils.createAttachmentStream(streamDetails, Optional.empty())));
         }
-        if (message.previews().size() > 0) {
+        if (!message.previews().isEmpty()) {
             final var previews = new ArrayList<SignalServicePreview>(message.previews().size());
             for (final var p : message.previews()) {
                 final var image = p.image().isPresent() ? context.getAttachmentHelper()
@@ -874,7 +874,7 @@ public class ManagerImpl implements Manager {
         if (!account.isPrimaryDevice()) {
             throw new NotPrimaryDeviceException();
         }
-        if (recipients.size() == 0) {
+        if (recipients.isEmpty()) {
             return;
         }
         final var recipientIds = context.getRecipientHelper().resolveRecipients(recipients);
@@ -906,7 +906,7 @@ public class ManagerImpl implements Manager {
         if (!account.isPrimaryDevice()) {
             throw new NotPrimaryDeviceException();
         }
-        if (groupIds.size() == 0) {
+        if (groupIds.isEmpty()) {
             return;
         }
         boolean shouldRotateProfileKey = false;
@@ -1083,7 +1083,7 @@ public class ManagerImpl implements Manager {
             return true;
         }
         synchronized (messageHandlers) {
-            return messageHandlers.size() > 0;
+            return !messageHandlers.isEmpty();
         }
     }
 
@@ -1113,7 +1113,7 @@ public class ManagerImpl implements Manager {
             synchronized (messageHandlers) {
                 receiveThread = null;
                 isReceivingSynchronous = false;
-                if (messageHandlers.size() > 0) {
+                if (!messageHandlers.isEmpty()) {
                     startReceiveThreadIfRequired();
                 }
             }

src/main/java/org/asamk/signal/ReceiveMessageHandler.java

@@ -127,7 +127,7 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
             final var groupCallUpdate = message.groupCallUpdate().get();
             writer.indentedWriter().println("Era id: {}", groupCallUpdate.eraId());
         }
-        if (message.previews().size() > 0) {
+        if (!message.previews().isEmpty()) {
             writer.println("Previews:");
             final var previews = message.previews();
             for (var preview : previews) {
@@ -135,7 +135,7 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
                 printPreview(writer.indentedWriter(), preview);
             }
         }
-        if (message.sharedContacts().size() > 0) {
+        if (!message.sharedContacts().isEmpty()) {
             writer.println("Contacts:");
             for (var contact : message.sharedContacts()) {
                 writer.println("- Contact:");
@@ -176,19 +176,19 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
             final var remoteDelete = message.remoteDeleteId().get();
             writer.println("Remote delete message: timestamp = {}", remoteDelete);
         }
-        if (message.mentions().size() > 0) {
+        if (!message.mentions().isEmpty()) {
             writer.println("Mentions:");
             for (var mention : message.mentions()) {
                 printMention(writer, mention);
             }
         }
-        if (message.textStyles().size() > 0) {
+        if (!message.textStyles().isEmpty()) {
             writer.println("Text styles:");
             for (var textStyle : message.textStyles()) {
                 printTextStyle(writer, textStyle);
             }
         }
-        if (message.attachments().size() > 0) {
+        if (!message.attachments().isEmpty()) {
             writer.println("Attachments:");
             for (var attachment : message.attachments()) {
                 writer.println("- Attachment:");
@@ -283,7 +283,7 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
             var hangupMessage = callMessage.hangup().get();
             writer.println("Hangup message: {}", hangupMessage.id());
         }
-        if (callMessage.iceUpdate().size() > 0) {
+        if (!callMessage.iceUpdate().isEmpty()) {
             writer.println("Ice update messages:");
             var iceUpdateMessages = callMessage.iceUpdate();
             for (var iceUpdateMessage : iceUpdateMessages) {
@@ -313,7 +313,7 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
         if (syncMessage.groups().isPresent()) {
             writer.println("Received sync groups.");
         }
-        if (syncMessage.read().size() > 0) {
+        if (!syncMessage.read().isEmpty()) {
             writer.println("Received sync read messages list");
             for (var rm : syncMessage.read()) {
                 writer.println("- From: {} Message timestamp: {}",
@@ -321,7 +321,7 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
                         DateUtils.formatTimestamp(rm.timestamp()));
             }
         }
-        if (syncMessage.viewed().size() > 0) {
+        if (!syncMessage.viewed().isEmpty()) {
             writer.println("Received sync viewed messages list");
             for (var vm : syncMessage.viewed()) {
                 writer.println("- From: {} Message timestamp: {}",
@@ -335,7 +335,7 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
             String to;
             if (sentTranscriptMessage.destination().isPresent()) {
                 to = formatContact(sentTranscriptMessage.destination().get());
-            } else if (sentTranscriptMessage.recipients().size() > 0) {
+            } else if (!sentTranscriptMessage.recipients().isEmpty()) {
                 to = sentTranscriptMessage.recipients()
                         .stream()
                         .map(this::formatContact)
@@ -429,13 +429,13 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
         if (quote.text().isPresent()) {
             writer.println("Text: {}", quote.text().get());
         }
-        if (quote.mentions() != null && quote.mentions().size() > 0) {
+        if (quote.mentions() != null && !quote.mentions().isEmpty()) {
             writer.println("Mentions:");
             for (var mention : quote.mentions()) {
                 printMention(writer, mention);
             }
         }
-        if (quote.attachments().size() > 0) {
+        if (!quote.attachments().isEmpty()) {
             writer.println("Attachments:");
             for (var attachment : quote.attachments()) {
                 writer.println("- Attachment:");
@@ -478,7 +478,7 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
             writer.println("Organisation: {}", contact.organization().get());
         }
 
-        if (contact.phone().size() > 0) {
+        if (!contact.phone().isEmpty()) {
             writer.println("Phone details:");
             for (var phone : contact.phone()) {
                 writer.println("- Phone:");
@@ -492,7 +492,7 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
             }
         }
 
-        if (contact.email().size() > 0) {
+        if (!contact.email().isEmpty()) {
             writer.println("Email details:");
             for (var email : contact.email()) {
                 writer.println("- Email:");
@@ -506,7 +506,7 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
             }
         }
 
-        if (contact.address().size() > 0) {
+        if (!contact.address().isEmpty()) {
             writer.println("Address details:");
             for (var address : contact.address()) {
                 writer.println("- Address:");
@@ -615,7 +615,7 @@ public class ReceiveMessageHandler implements Manager.ReceiveMessageHandler {
         if (attachment.isGif()) {
             flags.add("video gif");
         }
-        if (flags.size() > 0) {
+        if (!flags.isEmpty()) {
             writer.println("Flags: {}", String.join(", ", flags));
         }
         if (attachment.width().isPresent() || attachment.height().isPresent()) {

src/main/java/org/asamk/signal/commands/ListGroupsCommand.java

@@ -85,7 +85,7 @@ public class ListGroupsCommand implements JsonRpcLocalCommand {
 
         final var groupIdStrings = ns.<String>getList("group-id");
         final var groupIds = CommandUtil.getGroupIds(groupIdStrings);
-        if (groupIds.size() > 0) {
+        if (!groupIds.isEmpty()) {
             groups = groups.stream().filter(g -> groupIds.contains(g.groupId())).toList();
         }
 

src/main/java/org/asamk/signal/dbus/DbusCommandHandler.java

@@ -65,7 +65,7 @@ public class DbusCommandHandler {
                 SignalControl.class);
         try {
             final var accounts = control.listAccounts();
-            if (accounts.size() == 0) {
+            if (accounts.isEmpty()) {
                 throw new UserErrorException("No local users found, you first need to register or link an account");
             } else if (accounts.size() > 1) {
                 throw new UserErrorException(

src/main/java/org/asamk/signal/dbus/DbusManagerImpl.java

@@ -244,7 +244,7 @@ public class DbusManagerImpl implements Manager {
     public SendGroupMessageResults quitGroup(
             final GroupId groupId, final Set<RecipientIdentifier.Single> groupAdmins
     ) throws GroupNotFoundException, IOException, NotAGroupMemberException, LastGroupAdminException {
-        if (groupAdmins.size() > 0) {
+        if (!groupAdmins.isEmpty()) {
             throw new UnsupportedOperationException();
         }
         final var group = getRemoteObject(signal.getGroup(groupId.serialize()), Signal.Group.class);
@@ -522,7 +522,7 @@ public class DbusManagerImpl implements Manager {
             if (isWeakListener) {
                 weakHandlers.add(handler);
             } else {
-                if (messageHandlers.size() == 0) {
+                if (messageHandlers.isEmpty()) {
                     installMessageHandlers();
                 }
                 messageHandlers.add(handler);
@@ -535,7 +535,7 @@ public class DbusManagerImpl implements Manager {
         synchronized (messageHandlers) {
             weakHandlers.remove(handler);
             messageHandlers.remove(handler);
-            if (messageHandlers.size() == 0) {
+            if (messageHandlers.isEmpty()) {
                 uninstallMessageHandlers();
             }
         }
@@ -544,7 +544,7 @@ public class DbusManagerImpl implements Manager {
     @Override
     public boolean isReceiving() {
         synchronized (messageHandlers) {
-            return messageHandlers.size() > 0;
+            return !messageHandlers.isEmpty();
         }
     }
 
@@ -622,7 +622,7 @@ public class DbusManagerImpl implements Manager {
                 return null;
             }
             final var contactName = signal.getContactName(n);
-            if (onlyContacts && contactName.length() == 0) {
+            if (onlyContacts && contactName.isEmpty()) {
                 return null;
             }
             if (name.isPresent() && !name.get().equals(contactName)) {
@@ -721,7 +721,7 @@ public class DbusManagerImpl implements Manager {
             this.notify();
         }
         synchronized (messageHandlers) {
-            if (messageHandlers.size() > 0) {
+            if (!messageHandlers.isEmpty()) {
                 uninstallMessageHandlers();
             }
             weakHandlers.clear();
@@ -745,7 +745,7 @@ public class DbusManagerImpl implements Manager {
                 .map(RecipientIdentifier.Single.class::cast)
                 .map(RecipientIdentifier.Single::getIdentifier)
                 .toList();
-        if (singleRecipients.size() > 0) {
+        if (!singleRecipients.isEmpty()) {
             timestamp = recipientsHandler.apply(singleRecipients);
         }
 

src/main/java/org/asamk/signal/dbus/DbusReceiveMessageHandler.java

@@ -131,7 +131,7 @@ public class DbusReceiveMessageHandler implements Manager.ReceiveMessageHandler
 
     private List<String> getAttachments(MessageEnvelope.Data message) {
         var attachments = new ArrayList<String>();
-        if (message.attachments().size() > 0) {
+        if (!message.attachments().isEmpty()) {
             for (var attachment : message.attachments()) {
                 if (attachment.file().isPresent()) {
                     attachments.add(attachment.file().get().getAbsolutePath());
@@ -143,7 +143,7 @@ public class DbusReceiveMessageHandler implements Manager.ReceiveMessageHandler
 
     private HashMap<String, Variant<?>> getMessageExtras(MessageEnvelope.Data message) {
         var extras = new HashMap<String, Variant<?>>();
-        if (message.attachments().size() > 0) {
+        if (!message.attachments().isEmpty()) {
             var attachments = message.attachments()
                     .stream()
                     .filter(a -> a.id().isPresent())
@@ -151,7 +151,7 @@ public class DbusReceiveMessageHandler implements Manager.ReceiveMessageHandler
                     .toList();
             extras.put("attachments", new Variant<>(attachments, "aa{sv}"));
         }
-        if (message.mentions().size() > 0) {
+        if (!message.mentions().isEmpty()) {
             var mentions = message.mentions().stream().map(this::getMentionMap).toList();
             extras.put("mentions", new Variant<>(mentions, "aa{sv}"));
         }

src/main/java/org/asamk/signal/http/ServerSentEventSender.java

@@ -35,7 +35,7 @@ public class ServerSentEventSender {
             writer.write(event);
             writer.write("\n");
         }
-        if (data.size() == 0) {
+        if (data.isEmpty()) {
             writer.write("data\n");
         } else {
             for (final var d : data) {

src/main/java/org/asamk/signal/json/JsonDataMessage.java

@@ -38,27 +38,27 @@ record JsonDataMessage(
         final var reaction = dataMessage.reaction().map(JsonReaction::from).orElse(null);
         final var quote = dataMessage.quote().isPresent() ? JsonQuote.from(dataMessage.quote().get()) : null;
         final var payment = dataMessage.payment().isPresent() ? JsonPayment.from(dataMessage.payment().get()) : null;
-        final var mentions = dataMessage.mentions().size() > 0 ? dataMessage.mentions()
+        final var mentions = !dataMessage.mentions().isEmpty() ? dataMessage.mentions()
                 .stream()
                 .map(JsonMention::from)
                 .toList() : null;
-        final var previews = dataMessage.previews().size() > 0 ? dataMessage.previews()
+        final var previews = !dataMessage.previews().isEmpty() ? dataMessage.previews()
                 .stream()
                 .map(JsonPreview::from)
                 .toList() : null;
         final var remoteDelete = dataMessage.remoteDeleteId().isPresent()
                 ? new JsonRemoteDelete(dataMessage.remoteDeleteId().get())
                 : null;
-        final var attachments = dataMessage.attachments().size() > 0 ? dataMessage.attachments()
+        final var attachments = !dataMessage.attachments().isEmpty() ? dataMessage.attachments()
                 .stream()
                 .map(JsonAttachment::from)
                 .toList() : null;
         final var sticker = dataMessage.sticker().isPresent() ? JsonSticker.from(dataMessage.sticker().get()) : null;
-        final var contacts = dataMessage.sharedContacts().size() > 0 ? dataMessage.sharedContacts()
+        final var contacts = !dataMessage.sharedContacts().isEmpty() ? dataMessage.sharedContacts()
                 .stream()
                 .map(JsonSharedContact::from)
                 .toList() : null;
-        final var textStyles = dataMessage.textStyles().size() > 0 ? dataMessage.textStyles()
+        final var textStyles = !dataMessage.textStyles().isEmpty() ? dataMessage.textStyles()
                 .stream()
                 .map(JsonTextStyle::from)
                 .toList() : null;

src/main/java/org/asamk/signal/json/JsonQuote.java

@@ -26,16 +26,16 @@ public record JsonQuote(
         final var authorUuid = address.uuid().map(UUID::toString).orElse(null);
         final var text = quote.text().orElse(null);
 
-        final var mentions = quote.mentions().size() > 0
+        final var mentions = !quote.mentions().isEmpty()
                 ? quote.mentions().stream().map(JsonMention::from).toList()
                 : null;
 
-        final var attachments = quote.attachments().size() > 0 ? quote.attachments()
+        final var attachments = !quote.attachments().isEmpty() ? quote.attachments()
                 .stream()
                 .map(JsonQuotedAttachment::from)
                 .toList() : List.<JsonQuotedAttachment>of();
 
-        final var textStyles = quote.textStyles().size() > 0 ? quote.textStyles()
+        final var textStyles = !quote.textStyles().isEmpty() ? quote.textStyles()
                 .stream()
                 .map(JsonTextStyle::from)
                 .toList() : null;

src/main/java/org/asamk/signal/json/JsonSharedContact.java

@@ -19,15 +19,15 @@ public record JsonSharedContact(
         final var name = JsonContactName.from(contact.name());
         final var avatar = contact.avatar().isPresent() ? JsonContactAvatar.from(contact.avatar().get()) : null;
 
-        final var phone = contact.phone().size() > 0
+        final var phone = !contact.phone().isEmpty()
                 ? contact.phone().stream().map(JsonContactPhone::from).toList()
                 : null;
 
-        final var email = contact.email().size() > 0
+        final var email = !contact.email().isEmpty()
                 ? contact.email().stream().map(JsonContactEmail::from).toList()
                 : null;
 
-        final var address = contact.address().size() > 0 ? contact.address()
+        final var address = !contact.address().isEmpty() ? contact.address()
                 .stream()
                 .map(JsonContactAddress::from)
                 .toList() : null;

src/main/java/org/asamk/signal/json/JsonSyncMessage.java

@@ -45,7 +45,7 @@ record JsonSyncMessage(
             blockedGroupIds = null;
         }
 
-        final var readMessages = syncMessage.read().size() > 0 ? syncMessage.read()
+        final var readMessages = !syncMessage.read().isEmpty() ? syncMessage.read()
                 .stream()
                 .map(JsonSyncReadMessage::from)
                 .toList() : null;

src/main/java/org/asamk/signal/jsonrpc/JsonRpcReader.java

@@ -127,7 +127,7 @@ public class JsonRpcReader {
                 Util.closeExecutorService(executor);
             }
 
-            if (responseList.size() > 0) {
+            if (!responseList.isEmpty()) {
                 jsonRpcSender.sendBatchResponses(responseList);
             }
         }
@@ -193,7 +193,7 @@ public class JsonRpcReader {
                     null), null));
             return null;
         } else if (jsonNode.isArray()) {
-            if (jsonNode.size() == 0) {
+            if (jsonNode.isEmpty()) {
                 jsonRpcSender.sendResponse(JsonRpcResponse.forError(new JsonRpcResponse.Error(JsonRpcResponse.Error.INVALID_REQUEST,
                         "invalid request",
                         null), null));

src/main/java/org/asamk/signal/util/Util.java

@@ -41,12 +41,12 @@ public class Util {
     }
 
     private static String toCamelCaseString(List<String> strings) {
-        if (strings.size() == 0) {
+        if (strings.isEmpty()) {
             return "";
         }
         return strings.get(0) + strings.stream()
                 .skip(1)
-                .filter(s -> s.length() > 0)
+                .filter(s -> !s.isEmpty())
                 .map(s -> Character.toUpperCase(s.charAt(0)) + s.substring(1).toLowerCase(Locale.ROOT))
                 .collect(Collectors.joining());
     }