Fix transformations API call

Author: YomesInc

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

@@ -235,24 +235,30 @@ public ApiResponse transformations(Map options) throws Exception {
 
     public ApiResponse transformation(String transformation, Map options) throws Exception {
         if (options == null) options = ObjectUtils.emptyMap();
-        return callApi(HttpMethod.GET, Arrays.asList("transformations", transformation), ObjectUtils.only(options, "next_cursor", "max_results"), options);
+        Map map = ObjectUtils.only(options, "next_cursor", "max_results");
+        map.put("transformation", transformation);
+        return callApi(HttpMethod.GET, Arrays.asList("transformations"), map, options);
     }
 
     public ApiResponse deleteTransformation(String transformation, Map options) throws Exception {
         if (options == null) options = ObjectUtils.emptyMap();
-        return callApi(HttpMethod.DELETE, Arrays.asList("transformations", transformation), ObjectUtils.emptyMap(), options);
+        Map updates = ObjectUtils.asMap("transformation", transformation);
+        return callApi(HttpMethod.DELETE, Arrays.asList("transformations"), updates, options);
     }
 
     // updates - currently only supported update are:
     // "allowed_for_strict": boolean flag
     // "unsafe_update": transformation string
     public ApiResponse updateTransformation(String transformation, Map updates, Map options) throws Exception {
         if (options == null) options = ObjectUtils.emptyMap();
-        return callApi(HttpMethod.PUT, Arrays.asList("transformations", transformation), updates, options);
+        updates.put("transformation", transformation);
+        return callApi(HttpMethod.PUT, Arrays.asList("transformations"), updates, options);
     }
 
     public ApiResponse createTransformation(String name, String definition, Map options) throws Exception {
-        return callApi(HttpMethod.POST, Arrays.asList("transformations", name), ObjectUtils.asMap("transformation", definition), options);
+        return callApi(HttpMethod.POST, 
+                Arrays.asList("transformations"), 
+                ObjectUtils.asMap("transformation", definition, "name", name), options);
     }
 
     public ApiResponse uploadPresets(Map options) throws Exception {

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

@@ -36,7 +36,7 @@ public String generate(Iterable<Map> optionsList) {
             }
         }
 
-        if (StringUtils.isNotBlank(format)){
+        if (format != null){
             components.add(format);
         }
 
@@ -48,7 +48,7 @@ public String generate(Map options) {
         List<String> eager = new ArrayList<String>();
         eager.add(super.generate(options));
 
-        if (StringUtils.isNotBlank(format)){
+        if (format != null){
             eager.add(format);
         }
 

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

@@ -307,6 +307,15 @@ public void testContextMetadataToUserVariables() {
         assertEquals("$xpos_ctx:!x_pos!_to_f,$ypos_ctx:!y_pos!_to_f,c_crop,x_$xpos_mul_w,y_$ypos_mul_h", t.generate());
     }
 
+    @Test
+    public void testFormatInTransformation() {
+        String t = new EagerTransformation().width(100).format("jpeg").generate();
+        assertEquals("w_100/jpeg", t);
+
+        t = new EagerTransformation().width(100).format("").generate();
+        assertEquals("w_100/", t);
+    }
+
     @Parameters({ "angle",
             "aspect_ratio",
             "dpr",