Added StringUtilities.count(content, token) which returns the number …

…of times the token is inside the content.
jdereg · Oct 30, 2023 · 78ff1de · 78ff1de
1 parent 8fbb5e2
commit 78ff1de
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Showing 2 changed files with 41 additions and 8 deletions.
diff --git a/src/main/java/com/cedarsoftware/util/StringUtilities.java b/src/main/java/com/cedarsoftware/util/StringUtilities.java
@@ -169,22 +169,44 @@ private static char convertDigit(int value)
 
     public static int count(String s, char c)
     {
-        if (isEmpty(s))
+        return count (s, "" + c);
+    }
+
+    /**
+     * Count the number of times that 'token' occurs within 'content'.
+     * @return int count (0 if it never occurs, null is the source string, or null is the token).
+     */
+    public static int count(CharSequence content, CharSequence token)
+    {
+        if (content == null || token == null)
         {
             return 0;
         }
 
-        final int len = s.length();
-        int count = 0;
-        for (int i = 0; i < len; i++)
+        String source = content.toString();
+        if (source.isEmpty())
+        {
+            return 0;
+        }
+        String sub = token.toString();
+        if (sub.isEmpty())
+        {
+            return 0;
+        }
+
+        int answer = 0;
+        int idx = 0;
+
+        while (true)
         {
-            if (s.charAt(i) == c)
+            idx = source.indexOf(sub, idx);
+            if (idx < answer)
             {
-                count++;
+                return answer;
             }
+            answer = ++answer;
+            idx = ++idx;
         }
-
-        return count;
     }
 
     /**

diff --git a/src/test/java/com/cedarsoftware/util/TestStringUtilities.java b/src/test/java/com/cedarsoftware/util/TestStringUtilities.java
@@ -376,4 +376,15 @@ public void testHashCodeIgnoreCase()
         assert StringUtilities.hashCodeIgnoreCase(null) == 0;
         assert StringUtilities.hashCodeIgnoreCase("") == 0;
     }
+
+    @Test
+    public void testCount2()
+    {
+        assert 0 == StringUtilities.count("alphabet", null);
+        assert 0 == StringUtilities.count(null, "al");
+        assert 0 == StringUtilities.count("alphabet", "");
+        assert 0 == StringUtilities.count("", "al");
+        assert 1 == StringUtilities.count("alphabet", "al");
+        assert 2 == StringUtilities.count("halal", "al");
+    }
 }