Add url_suffix support for private images. (#76)

Author: nitzanj

cloudinary-core/src/main/java/com/cloudinary/Url.java

@@ -449,15 +449,19 @@ public String finalizeResourceType(String resourceType, String type, String urlS
         if (type == null) {
             type = "upload";
         }
+
         if (!StringUtils.isBlank(urlSuffix)) {
             if (resourceType.equals("image") && type.equals("upload")) {
                 resourceType = "images";
                 type = null;
+            } else if (resourceType.equals("image") && type.equals("private")) {
+                resourceType = "private_images";
+                type = null;
             } else if (resourceType.equals("raw") && type.equals("upload")) {
                 resourceType = "files";
                 type = null;
             } else {
-                throw new IllegalArgumentException("URL Suffix only supported for image/upload and raw/upload");
+                throw new IllegalArgumentException("URL Suffix only supported for image/upload, image/private and raw/upload");
             }
         }
         if (useRootPath) {

cloudinary-core/src/test/java/com/cloudinary/test/CloudinaryTest.java

@@ -228,6 +228,11 @@ public void testSupportUrlSuffixForRawUploads() {
         assertEquals("http://test123-res.cloudinary.com/files/test/hello", actual);
     }
 
+    @Test
+    public void testSupportUrlSuffixForPrivateImages(){
+        String actual = cloudinary.url().suffix("hello").privateCdn(true).resourceType("image").type("private").generate("test");
+        assertEquals("http://test123-res.cloudinary.com/private_images/test/hello", actual);
+    }
     @Test(expected = IllegalArgumentException.class)
     public void testDisllowUseRootPathInSharedDistribution() {
         cloudinary.url().useRootPath(true).generate("test");