Patch from Fredrik Westermarck <fredrik.westermarck@mdh.se> that adds the

containsOnly method. I added a couple more unit tests and modified the code
slightly.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@137047 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/lang/StringUtils.java

@@ -81,7 +81,8 @@ import java.util.Iterator;
  * @author <a href="mailto:ed@apache.org">Ed Korthof</a>
  * @author <a href="mailto:rand_mcneely@yahoo.com>Rand McNeely</a>
  * @author <a href="mailto:scolebourne@joda.org>Stephen Colebourne</a>
- * @version $Id: StringUtils.java,v 1.10 2002/08/31 19:05:32 bayard Exp $
+ * @author <a href="mailto:fredrik@westermarck.com>Fredrik Westermarck</a>
+ * @version $Id: StringUtils.java,v 1.11 2002/09/19 06:58:13 bayard Exp $
  */
 public class StringUtils {
 
@@ -1547,6 +1548,34 @@ public class StringUtils {
         return d[n][m];
     }
 
+    /**
+     * Checks if the String contains only certain chars.
+     *
+     * @param str the String to check
+     * @param valid an array of valid chars
+     * @return true if it only contains valid chars and is non-null
+     */
+    public static boolean containsOnly(String str, char[] valid) {
+        if(str == null || valid == null) {
+            return false;
         }
 
+        int strSize = str.length();
+        int validSize = valid.length;
 
+        for(int i=0; i<strSize; i++) {
+            boolean contains = false;
+            for(int j=0; j<validSize; j++) {
+                if(valid[j] == str.charAt(i)) {
+                    contains = true;
+                    break;
+                }
+            }
+            if(!contains) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}

src/test/org/apache/commons/lang/StringUtilsTest.java

@@ -67,7 +67,8 @@ import junit.textui.TestRunner;
  * @author <a href="mailto:bayard@generationjava.com">Henri Yandell</a>
  * @author <a href="mailto:scolebourne@joda.org">Stephen Colebourne</a>
  * @author <a href="mailto:ridesmet@users.sourceforge.net">Ringo De Smet</a>
- * @version $Id: StringUtilsTest.java,v 1.3 2002/07/26 01:40:11 dlr Exp $
+ * @author <a href="mailto:fredrik@westermarck.com>Fredrik Westermarck</a>
+ * @version $Id: StringUtilsTest.java,v 1.4 2002/09/19 06:58:13 bayard Exp $
  */
 public class StringUtilsTest extends TestCase
 {
@@ -327,5 +328,30 @@ public class StringUtilsTest extends TestCase
                      1, StringUtils.getLevenshteinDistance("hello", "hallo") );
     }
 
+    public void testContainsOnly() {
+        String str1 = "a";
+        String str2 = "b";
+        String str3 = "ab";
+        char[] chars1= {'b'};
+        char[] chars2= {'a'};
+        char[] chars3= {'a', 'b'};
+        char[] emptyChars = new char[0];
+        assertEquals("containsOnly(null, null) failed", false, StringUtils.containsOnly(null, null));
+        assertEquals("containsOnly(empty-string, null) failed", false, StringUtils.containsOnly("", null));
+        assertEquals("containsOnly(null, empty-string) failed", false, StringUtils.containsOnly(null, emptyChars));
+        assertEquals("containsOnly(str1, empty-char-array) failed", false, StringUtils.containsOnly(str1, emptyChars));
+        assertEquals("containsOnly(empty-string, chars1) failed", true, StringUtils.containsOnly("", chars1));
+        assertEquals("containsOnly(str1, chars1) failed", false, StringUtils.containsOnly(str1, chars1));
+        assertEquals("containsOnly(str1, chars1) failed", false, StringUtils.containsOnly(str1, chars1));
+        assertEquals("containsOnly(str1, chars1) success", true, StringUtils.containsOnly(str1, chars2));
+        assertEquals("containsOnly(str1, chars1) success", true, StringUtils.containsOnly(str1, chars3));
+        assertEquals("containsOnly(str2, chars2) success", true, StringUtils.containsOnly(str2, chars1));
+        assertEquals("containsOnly(str2, chars2) failed", false, StringUtils.containsOnly(str2, chars2));
+        assertEquals("containsOnly(str2, chars2) success", true, StringUtils.containsOnly(str2, chars3));
+        assertEquals("containsOnly(String3, chars3) failed", false, StringUtils.containsOnly(str3, chars1));
+        assertEquals("containsOnly(String3, chars3) failed", false, StringUtils.containsOnly(str3, chars2));
+        assertEquals("containsOnly(String3, chars3) success", true, StringUtils.containsOnly(str3, chars3));
+    }
+
 }