Implement Document factory constructors on language client

docs/language-usage.rst

@@ -127,8 +127,8 @@ to content stored in `Google Cloud Storage`_. We can use the
 
   .. code-block:: python
 
-     >>> document = client.document_from_blob(bucket='my-text-bucket',
-     ...                                      blob='sentiment-me.txt')
+     >>> document = client.document_from_blob('my-text-bucket',
+     ...                                      'sentiment-me.txt')
      >>> document.gcs_url
      'gs://my-text-bucket/sentiment-me.txt'
      >>> document.doc_type == language.Document.PLAIN_TEXT

gcloud/language/client.py

@@ -101,6 +101,35 @@ def document_from_url(self, gcs_url,
                        :class:`Document` constructor.
 
         :rtype: :class:`Document`
-        :returns: A plain-text document bound to this client.
+        :returns: A document bound to this client.
         """
         return Document(self, gcs_url=gcs_url, doc_type=doc_type, **kwargs)
+
+    def document_from_blob(self, bucket_name, blob_name,
+                           doc_type=Document.PLAIN_TEXT, **kwargs):
+        """Create a Cloud Storage document bound to this client.
+
+        :type bucket_name: str
+        :param bucket_name: The name of the bucket that contains the
+                            document text.
+
+        :type blob_name: str
+        :param blob_name: The name of the blob (within the bucket) that
+                          contains document text.
+
+        :type doc_type: str
+        :param doc_type: (Optional) The type of text in the document.
+                         Defaults to plain text. Can also be specified
+                         as HTML via :attr:`~.Document.HTML`.
+
+        :type kwargs: dict
+        :param kwargs: Remaining keyword arguments to be passed along to the
+                       :class:`Document` constructor.
+
+        :rtype: :class:`Document`
+        :returns: A document bound to this client.
+        """
+        # NOTE: We assume that the bucket and blob name don't
+        #       need to be URL-encoded.
+        gcs_url = 'gs://%s/%s' % (bucket_name, blob_name)
+        return self.document_from_url(gcs_url, doc_type=doc_type, **kwargs)

gcloud/language/test_client.py

@@ -121,6 +121,23 @@ def test_document_from_url_factory_explicit(self):
         self.assertEqual(document.doc_type, Document.HTML)
         self.assertEqual(document.encoding, encoding)
 
+    def test_document_from_blob_factory(self):
+        from gcloud.language.document import Document
+
+        creds = _Credentials()
+        client = self._makeOne(project='PROJECT',
+                               credentials=creds, http=object())
+
+        bucket_name = 'my-text-bucket'
+        blob_name = 'sentiment-me.txt'
+        gcs_url = 'gs://%s/%s' % (bucket_name, blob_name)
+        document = client.document_from_blob(bucket_name, blob_name)
+        self.assertIsInstance(document, Document)
+        self.assertIs(document.client, client)
+        self.assertIsNone(document.content)
+        self.assertEqual(document.gcs_url, gcs_url)
+        self.assertEqual(document.doc_type, Document.PLAIN_TEXT)
+
 
 class _Credentials(object):