LANG-1293: Add StringUtils#isAllEmpty and #isAllBlank methods

src/main/java/org/apache/commons/lang3/StringUtils.java

@@ -310,6 +310,29 @@ public class StringUtils {
       return !isAnyEmpty(css);
     }
 
+    /**
+     * <p>Checks if all of the CharSequences are empty ("") or null.</p>
+     *
+     * <pre>
+     * StringUtils.isAllEmpty(null)             = true
+     * StringUtils.isAllEmpty(null, "")         = true
+     * StringUtils.isAllEmpty(new String[] {})  = true
+     * StringUtils.isAllEmpty(null, "foo")      = false
+     * StringUtils.isAllEmpty("", "bar")        = false
+     * StringUtils.isAllEmpty("bob", "")        = false
+     * StringUtils.isAllEmpty("  bob  ", null)  = false
+     * StringUtils.isAllEmpty(" ", "bar")       = false
+     * StringUtils.isAllEmpty("foo", "bar")     = false
+     * </pre>
+     *
+     * @param css  the CharSequences to check, may be null or empty
+     * @return {@code true} if all of the CharSequences are empty or null
+     * @since 3.6
+     */
+    public static boolean isAllEmpty(final CharSequence... css) {
+      return !isAnyNotEmpty(css);
+    }
+
     /**
      * <p>Checks if a CharSequence is empty (""), null or whitespace only.</p>
      * 
@@ -455,6 +478,31 @@ public class StringUtils {
       return !isAnyBlank(css);
     }
 
+    /**
+     * <p>Checks if all of the CharSequences are empty (""), null or whitespace only.</p>
+     *
+     * </p>Whitespace is defined by {@link Character#isWhitespace(char)}.</p>
+     *
+     * <pre>
+     * StringUtils.isAllBlank(null)             = true
+     * StringUtils.isAllBlank(null, "foo")      = false
+     * StringUtils.isAllBlank(null, null)       = true
+     * StringUtils.isAllBlank("", "bar")        = false
+     * StringUtils.isAllBlank("bob", "")        = false
+     * StringUtils.isAllBlank("  bob  ", null)  = false
+     * StringUtils.isAllBlank(" ", "bar")       = false
+     * StringUtils.isAllBlank("foo", "bar")     = false
+     * StringUtils.isAllBlank(new String[] {})  = true
+     * </pre>
+     *
+     * @param css  the CharSequences to check, may be null or empty
+     * @return {@code true} if all of the CharSequences are empty or null or whitespace only
+     * @since 3.6
+     */
+    public static boolean isAllBlank(final CharSequence... css) {
+      return !isAnyNotBlank(css);
+    }
+
     // Trim
     //-----------------------------------------------------------------------
     /**

src/test/java/org/apache/commons/lang3/StringUtilsEmptyBlankTest.java

@@ -81,6 +81,21 @@ public class StringUtilsEmptyBlankTest  {
         assertTrue(StringUtils.isNoneEmpty("foo", "bar"));
     }
 
+    @Test
+    public void testIsAllEmpty() {
+        assertTrue(StringUtils.isAllEmpty());
+        assertTrue(StringUtils.isAllEmpty(new String[]{}));
+        assertTrue(StringUtils.isAllEmpty((String) null));
+        assertTrue(StringUtils.isAllEmpty((String[]) null));
+        assertFalse(StringUtils.isAllEmpty(null, "foo"));
+        assertFalse(StringUtils.isAllEmpty("", "bar"));
+        assertFalse(StringUtils.isAllEmpty("bob", ""));
+        assertFalse(StringUtils.isAllEmpty("  bob  ", null));
+        assertFalse(StringUtils.isAllEmpty(" ", "bar"));
+        assertFalse(StringUtils.isAllEmpty("foo", "bar"));
+        assertTrue(StringUtils.isAllEmpty("", null));
+    }
+
     @Test
     public void testIsBlank() {
         assertTrue(StringUtils.isBlank(null));
@@ -137,4 +152,18 @@ public class StringUtilsEmptyBlankTest  {
         assertFalse(StringUtils.isNoneBlank(" ", "bar"));
         assertTrue(StringUtils.isNoneBlank("foo", "bar"));
     }
+
+    @Test
+    public void testIsAllBlank() {
+        assertTrue(StringUtils.isAllBlank((String) null));
+        assertTrue(StringUtils.isAllBlank((String[]) null));
+        assertTrue(StringUtils.isAllBlank(null, null));
+        assertTrue(StringUtils.isAllBlank(null, " "));
+        assertFalse(StringUtils.isAllBlank(null, "foo"));
+        assertFalse(StringUtils.isAllBlank("", "bar"));
+        assertFalse(StringUtils.isAllBlank("bob", ""));
+        assertFalse(StringUtils.isAllBlank("  bob  ", null));
+        assertFalse(StringUtils.isAllBlank(" ", "bar"));
+        assertFalse(StringUtils.isAllBlank("foo", "bar"));
+    }
 }