Add creator and online information to group member list

briar-api/src/main/java/org/briarproject/briar/api/privategroup/GroupMember.java

@@ -1,9 +1,11 @@
 package org.briarproject.briar.api.privategroup;
 
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.Author.Status;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
+import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;
 
 @Immutable
@@ -12,11 +14,17 @@ public class GroupMember {
 
 	private final Author author;
 	private final Status status;
+	private final boolean isCreator;
+	@Nullable
+	private final ContactId contactId;
 	private final Visibility visibility;
 
-	public GroupMember(Author author, Status status, Visibility visibility) {
+	public GroupMember(Author author, Status status, boolean isCreator,
+			@Nullable ContactId contactId, Visibility visibility) {
 		this.author = author;
 		this.status = status;
+		this.isCreator = isCreator;
+		this.contactId = contactId;
 		this.visibility = visibility;
 	}
 
@@ -28,6 +36,19 @@ public class GroupMember {
 		return status;
 	}
 
+	public boolean isCreator() {
+		return isCreator;
+	}
+
+	/**
+	 * Returns the ContactId of a visible contact
+	 * or null if the contact is not visible or the member is no contact.
+	 */
+	@Nullable
+	public ContactId getContactId() {
+		return contactId;
+	}
+
 	public Visibility getVisibility() {
 		return visibility;
 	}