resovles #1648 set content type multipart upload

aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/InitiateMultipartUploadRequest.java

@@ -16,7 +16,9 @@
 
 import com.amazonaws.AmazonWebServiceRequest;
 import com.amazonaws.services.s3.AmazonS3;
+import com.amazonaws.services.s3.internal.Mimetypes;
 
+import java.io.File;
 import java.io.Serializable;
 import java.util.Date;
 
@@ -537,6 +539,39 @@ public InitiateMultipartUploadRequest withObjectMetadata(ObjectMetadata objectMe
         return this;
     }
 
+    /**
+     * Sets the additional information of content type about the new object being created.
+     * Sets content type in the object metadata. Creates object metadata if does not exist.
+     *
+     * @param file
+     *            File that would be uploaded. Uses file extension to determine
+     *            mimetype.
+     */
+    public void setObjectMetadataContentTypeFromFile(File file) {
+        if (this.objectMetadata == null) {
+            this.objectMetadata = new ObjectMetadata();
+        }
+        this.objectMetadata.setContentType(Mimetypes.getInstance().getMimetype(file));
+    }
+
+    /**
+     * Sets the additional information of content type about the new object being created.
+     * Sets content type in the object metadata. Creates object metadata if does not exist.
+     * <p>
+     * Returns this updated InitiateMultipartUploadRequest object so that
+     * additional method calls can be chained together.
+     *
+     * @param file
+     *            File that would be uploaded. Uses file extension to determine
+     *            mimetype.
+     *
+     * @return This updated InitiateMultipartUploadRequest object.
+     */
+    public InitiateMultipartUploadRequest withObjectMetadataContentTypeFromFile(File file) {
+        setObjectMetadataContentTypeFromFile(file);
+        return this;
+    }
+
     /**
      * Sets the optional redirect location for the new object.
      *

aws-java-sdk-s3/src/test/java/com/amazonaws/services/s3/model/InitiateMultipartUploadRequestTest.java

@@ -0,0 +1,35 @@
+package com.amazonaws.services.s3.model;
+
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+
+import java.io.File;
+
+/**
+ * Test Model InitiateMultipartUploadRequest
+ */
+public class InitiateMultipartUploadRequestTest {
+
+    /**
+     * Test setting the content type of the metadata for the multipart upload request
+     */
+    @Test
+    public void testWithObjectMetadataContentTypeFromFile(){
+        InitiateMultipartUploadRequest request = new InitiateMultipartUploadRequest("bucketName", "key", new ObjectMetadata());
+        File file = new File("textFile.txt");
+        request = request.withObjectMetadataContentTypeFromFile(file);
+        assertEquals("text/plain", request.getObjectMetadata().getContentType());
+    }
+
+    /**
+     * Test setting the content type of the metadata for the multipart upload request
+     * Creates the metadata object if it does not exist
+     */
+    @Test
+    public void testWithObjectMetadataContentTypeFromFileCreatesMetadata(){
+        InitiateMultipartUploadRequest request = new InitiateMultipartUploadRequest("bucketName", "key");
+        File file = new File("textFile.txt");
+        request = request.withObjectMetadataContentTypeFromFile(file);
+        assertEquals("text/plain", request.getObjectMetadata().getContentType());
+    }
+}