Escape addresses in thread, recipient pref, and group databases

Fixes #6847
// FREEBIE

src/org/thoughtcrime/securesms/util/DelimiterUtil.java

@@ -0,0 +1,21 @@
+package org.thoughtcrime.securesms.util;
+
+
+import java.util.regex.Pattern;
+
+public class DelimiterUtil {
+
+  public static String escape(String value, char delimiter) {
+    return value.replace("" + delimiter, "\\" + delimiter);
+  }
+
+  public static String unescape(String value, char delimiter) {
+    return value.replace("\\" + delimiter, "" + delimiter);
+  }
+
+  public static String[] split(String value, char delimiter) {
+    String regex = "(?<!\\\\)" + Pattern.quote(delimiter + "");
+    return value.split(regex);
+  }
+
+}

src/org/thoughtcrime/securesms/util/Util.java

@@ -72,20 +72,6 @@ public class Util {
 
   public static Handler handler = new Handler(Looper.getMainLooper());
 
-  public static String join(List<Address> list, String delimiter) {
-    return join(list.toArray(new Address[0]), delimiter);
-  }
-
-  public static String join(Address[] list, String delimiter) {
-    List<String> stringList = new LinkedList<>();
-
-    for (Address address : list) {
-      stringList.add(address.serialize());
-    }
-
-    return join(stringList, delimiter);
-  }
-
   public static String join(String[] list, String delimiter) {
     return join(Arrays.asList(list), delimiter);
   }