fixes networknt#180 add isBlank to StringUtil in utility class

younggwon1 · Mar 21, 2018 · 0264da9 · 0264da9
1 parent efe30ca
commit 0264da9
Showing 1 changed file with 30 additions and 1 deletion.
diff --git a/utility/src/main/java/com/networknt/utility/StringUtil.java b/utility/src/main/java/com/networknt/utility/StringUtil.java
@@ -321,5 +321,34 @@ public static String rightPad(final String str, final int size, String padStr) {
         }
     }
 
-
+    /**
+     * <p>Checks if a CharSequence is empty (""), null or whitespace only.</p>
+     *
+     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}.</p>
+     *
+     * <pre>
+     * StringUtils.isBlank(null)      = true
+     * StringUtils.isBlank("")        = true
+     * StringUtils.isBlank(" ")       = true
+     * StringUtils.isBlank("bob")     = false
+     * StringUtils.isBlank("  bob  ") = false
+     * </pre>
+     *
+     * @param cs  the CharSequence to check, may be null
+     * @return {@code true} if the CharSequence is null, empty or whitespace only
+     * @since 2.0
+     * @since 3.0 Changed signature from isBlank(String) to isBlank(CharSequence)
+     */
+    public static boolean isBlank(final CharSequence cs) {
+        int strLen;
+        if (cs == null || (strLen = cs.length()) == 0) {
+            return true;
+        }
+        for (int i = 0; i < strLen; i++) {
+            if (!Character.isWhitespace(cs.charAt(i))) {
+                return false;
+            }
+        }
+        return true;
+    }
 }