RM-4942 Ensure the API sorting is case insensitive.

Take notice of the locale of the server when performing the sort. Also
fix the security group and mark comparators to use the same system.

rm-community/rm-community-repo/source/java/org/alfresco/util/SortUtils.java

@@ -0,0 +1,71 @@
+/*
+ * #%L
+ * Alfresco Records Management Module
+ * %%
+ * Copyright (C) 2005 - 2017 Alfresco Software Limited
+ * %%
+ * This file is part of the Alfresco software.
+ * -
+ * If the software was purchased under a paid Alfresco license, the terms of
+ * the paid license agreement will prevail.  Otherwise, the software is
+ * provided under the following open source license terms:
+ * -
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * -
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ * -
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ * #L%
+ */
+package org.alfresco.util;
+
+import java.text.Collator;
+import java.text.ParseException;
+import java.text.RuleBasedCollator;
+
+/**
+ * Helper class to provide functionality related to sorting.
+ *
+ * @author Tom Page
+ * @since 2.6
+ */
+public class SortUtils
+{
+    /** The collator used for comparing Strings. */
+    private static Collator collator;
+
+    /** Private constructor for util class. */
+    private SortUtils()
+    {
+    }
+
+    /**
+     * Get a string comparator that sorts strings according to the locale of the server, and which treats spaces as
+     * earlier than alphanumeric characters.
+     *
+     * @return The comparator.
+     */
+    public static synchronized Collator getStringComparator()
+    {
+        if (collator == null)
+        {
+            String rules = ((RuleBasedCollator) Collator.getInstance()).getRules();
+            try
+            {
+                collator = new RuleBasedCollator(rules.replaceAll("<'\u005f'", "<' '<'\u005f'"));
+            }
+            catch (ParseException e)
+            {
+                throw new IllegalStateException(e);
+            }
+        }
+        return collator;
+    }
+}