Issue 4260 - Replace Apache Commons Lang classes

src/org/adblockplus/android/StringUtils.java

Index: src/org/adblockplus/android/StringUtils.java
diff --git a/src/org/adblockplus/android/StringUtils.java b/src/org/adblockplus/android/StringUtils.java
new file mode 100644
index 0000000000000000000000000000000000000000..be7c0af193d9c371c4ede9ea9c5847db44e57761
--- /dev/null
+++ b/src/org/adblockplus/android/StringUtils.java
@@ -0,0 +1,56 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2016 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.adblockplus.android;
+
+public class StringUtils
+{
+    public static boolean isNotEmpty(String value)

[René Jeschke, 2016/07/28 11:46:22]

We're using two-space indentation. ;-)

[anton, 2016/07/28 11:48:59]

Yes, i know. I've been thinking we can approve these changes, then approve
codestyle issue and reformat all the code according to approved rules. Do you
want me to reformat all the pending codereviews including this one now?

+    {
+        return value != null && value.length() > 0;
+    }
+
+    public static boolean isEmpty(String value)
+    {
+        return !isNotEmpty(value);
+    }
+
+    public static String join(Object[] array, String separator)
+    {
+        if (array == null)
+        {
+            return null;
+        }
+
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < array.length; i++)
+        {
+            String eachValue = array[i].toString();
+            if (i > 0 && separator != null)
+            {
+                sb.append(separator);
+            }
+
+            if (eachValue != null)
+            { 
+                sb.append(eachValue);
+            }
+        }
+
+        return sb.toString();
+    }
+}