added multipart form binder

core/src/main/java/org/jclouds/rest/annotations/PartParam.java

@@ -0,0 +1,52 @@
+/**
+ *
+ * Copyright (C) 2009 Cloud Conscious, LLC. <info@cloudconscious.com>
+ *
+ * ====================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ====================================================================
+ */
+package org.jclouds.rest.annotations;
+
+import static java.lang.annotation.ElementType.PARAMETER;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+import org.jclouds.http.MultipartForm.Part;
+
+import com.google.common.base.Function;
+
+/**
+ * Designates that this parameter will be bound to a multipart form.
+ * 
+ * @author Adrian Cole
+ */
+@Target(PARAMETER)
+@Retention(RUNTIME)
+public @interface PartParam {
+
+   public static class ALREADY_PART implements Function<Object, Part> {
+
+      @Override
+      public Part apply(Object from) {
+         return Part.class.cast(from);
+      }
+   };
+
+   /**
+    * how to convert this to a part.
+    */
+   Class<? extends Function<Object, Part>> value() default ALREADY_PART.class;
+}