Clean and regen docs (#401)

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+<h1><a href="bigquerydatatransfer_v1.html">BigQuery Data Transfer Service API</a> . <a href="bigquerydatatransfer_v1.projects.html">projects</a> . <a href="bigquerydatatransfer_v1.projects.dataSources.html">dataSources</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#checkValidCreds">checkValidCreds(name, body, x__xgafv=None)</a></code></p>
+<p class="firstline">Returns true if valid credentials exist for the given data source and</p>
+<p class="toc_element">
+  <code><a href="#get">get(name, x__xgafv=None)</a></code></p>
+<p class="firstline">Retrieves a supported data source and returns its settings,</p>
+<p class="toc_element">
+  <code><a href="#list">list(parent, pageToken=None, x__xgafv=None, pageSize=None)</a></code></p>
+<p class="firstline">Lists supported data sources and returns their settings,</p>
+<p class="toc_element">
+  <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
+<p class="firstline">Retrieves the next page of results.</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="checkValidCreds">checkValidCreds(name, body, x__xgafv=None)</code>
+  <pre>Returns true if valid credentials exist for the given data source and
+requesting user.
+
+Args:
+  name: string, The data source in the form:
+`projects/{project_id}/dataSources/{data_source_id}` (required)
+  body: object, The request body. (required)
+    The object takes the form of:
+
+{ # A request to determine whether the user has valid credentials. This method
+      # is used to limit the number of OAuth popups in the user interface. The
+      # user id is inferred from the API call context.
+      # If the data source has the Google+ authorization type, this method
+      # returns false, as it cannot be determined whether the credentials are
+      # already valid merely based on the user id.
+  }
+
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # A response indicating whether the credentials exist and are valid.
+    "hasValidCreds": True or False, # If set to `true`, the credentials exist and are valid.
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="get">get(name, x__xgafv=None)</code>
+  <pre>Retrieves a supported data source and returns its settings,
+which can be used for UI rendering.
+
+Args:
+  name: string, The field will contain name of the resource requested, for example:
+`projects/{project_id}/dataSources/{data_source_id}` (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Represents data source metadata. Metadata is sufficient to
+      # render UI and request proper OAuth tokens.
+    "scopes": [ # Api auth scopes for which refresh token needs to be obtained. Only valid
+        # when `client_id` is specified. Ignored otherwise. These are scopes needed
+        # by a data source to prepare data and ingest them into BigQuery,
+        # e.g., https://www.googleapis.com/auth/bigquery
+      "A String",
+    ],
+    "helpUrl": "A String", # Url for the help document for this data source.
+    "displayName": "A String", # User friendly data source name.
+    "name": "A String", # Data source resource name.
+    "dataRefreshType": "A String", # Specifies whether the data source supports automatic data refresh for the
+        # past few days, and how it's supported.
+        # For some data sources, data might not be complete until a few days later,
+        # so it's useful to refresh data automatically.
+    "authorizationType": "A String", # Indicates the type of authorization.
+    "description": "A String", # User friendly data source description string.
+    "clientId": "A String", # Data source client id which should be used to receive refresh token.
+        # When not supplied, no offline credentials are populated for data transfer.
+    "statusUpdateDeadlineSeconds": 42, # The number of seconds to wait for a status update from the data source
+        # before BigQuery marks the transfer as failed.
+    "manualRunsDisabled": True or False, # Disables backfilling and manual run scheduling
+        # for the data source.
+    "defaultSchedule": "A String", # Default data transfer schedule.
+        # Examples of valid schedules include:
+        # `1st,3rd monday of month 15:30`,
+        # `every wed,fri of jan,jun 13:15`, and
+        # `first sunday of quarter 00:00`.
+    "dataSourceId": "A String", # Data source id.
+    "defaultDataRefreshWindowDays": 42, # Default data refresh window on days.
+        # Only meaningful when `data_refresh_type` = `SLIDING_WINDOW`.
+    "supportsMultipleTransfers": True or False, # Indicates whether the data source supports multiple transfers
+        # to different BigQuery targets.
+    "supportsCustomSchedule": True or False, # Specifies whether the data source supports a user defined schedule, or
+        # operates on the default schedule.
+        # When set to `true`, user can override default schedule.
+    "parameters": [ # Data source parameters.
+      { # Represents a data source parameter with validation rules, so that
+          # parameters can be rendered in the UI. These parameters are given to us by
+          # supported data sources, and include all needed information for rendering
+          # and validation.
+          # Thus, whoever uses this api can decide to generate either generic ui,
+          # or custom data source specific forms.
+        "displayName": "A String", # Parameter display name in the user interface.
+        "description": "A String", # Parameter description.
+        "validationDescription": "A String", # Description of the requirements for this field, in case the user input does
+            # not fulfill the regex pattern or min/max values.
+        "fields": [ # When parameter is a record, describes child fields.
+          # Object with schema name: DataSourceParameter
+        ],
+        "required": True or False, # Is parameter required.
+        "allowedValues": [ # All possible values for the parameter.
+          "A String",
+        ],
+        "maxValue": 3.14, # For integer and double values specifies maxminum allowed value.
+        "minValue": 3.14, # For integer and double values specifies minimum allowed value.
+        "repeated": True or False, # Can parameter have multiple values.
+        "recurse": True or False, # If set to true, schema should be taken from the parent with the same
+            # parameter_id. Only applicable when parameter type is RECORD.
+        "validationRegex": "A String", # Regular expression which can be used for parameter validation.
+        "validationHelpUrl": "A String", # URL to a help document to further explain the naming requirements.
+        "paramId": "A String", # Parameter identifier.
+        "type": "A String", # Parameter type.
+        "immutable": True or False, # Cannot be changed after initial creation.
+      },
+    ],
+    "transferType": "A String", # Transfer type. Currently supports only batch transfers,
+        # which are transfers that use the BigQuery batch APIs (load or
+        # query) to ingest the data.
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="list">list(parent, pageToken=None, x__xgafv=None, pageSize=None)</code>
+  <pre>Lists supported data sources and returns their settings,
+which can be used for UI rendering.
+
+Args:
+  parent: string, The BigQuery project id for which data sources should be returned.
+Must be in the form: `projects/{project_id}` (required)
+  pageToken: string, Pagination token, which can be used to request a specific page
+of `ListDataSourcesRequest` list results. For multiple-page
+results, `ListDataSourcesResponse` outputs
+a `next_page` token, which can be used as the
+`page_token` value to request the next page of list results.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+  pageSize: integer, Page size. The default page size is the maximum value of 1000 results.
+
+Returns:
+  An object of the form:
+
+    { # Returns list of supported data sources and their metadata.
+    "nextPageToken": "A String", # The next-pagination token. For multiple-page list results,
+        # this token can be used as the
+        # `ListDataSourcesRequest.page_token`
+        # to request the next page of list results.
+        # @OutputOnly
+    "dataSources": [ # List of supported data sources and their transfer settings.
+      { # Represents data source metadata. Metadata is sufficient to
+          # render UI and request proper OAuth tokens.
+        "scopes": [ # Api auth scopes for which refresh token needs to be obtained. Only valid
+            # when `client_id` is specified. Ignored otherwise. These are scopes needed
+            # by a data source to prepare data and ingest them into BigQuery,
+            # e.g., https://www.googleapis.com/auth/bigquery
+          "A String",
+        ],
+        "helpUrl": "A String", # Url for the help document for this data source.
+        "displayName": "A String", # User friendly data source name.
+        "name": "A String", # Data source resource name.
+        "dataRefreshType": "A String", # Specifies whether the data source supports automatic data refresh for the
+            # past few days, and how it's supported.
+            # For some data sources, data might not be complete until a few days later,
+            # so it's useful to refresh data automatically.
+        "authorizationType": "A String", # Indicates the type of authorization.
+        "description": "A String", # User friendly data source description string.
+        "clientId": "A String", # Data source client id which should be used to receive refresh token.
+            # When not supplied, no offline credentials are populated for data transfer.
+        "statusUpdateDeadlineSeconds": 42, # The number of seconds to wait for a status update from the data source
+            # before BigQuery marks the transfer as failed.
+        "manualRunsDisabled": True or False, # Disables backfilling and manual run scheduling
+            # for the data source.
+        "defaultSchedule": "A String", # Default data transfer schedule.
+            # Examples of valid schedules include:
+            # `1st,3rd monday of month 15:30`,
+            # `every wed,fri of jan,jun 13:15`, and
+            # `first sunday of quarter 00:00`.
+        "dataSourceId": "A String", # Data source id.
+        "defaultDataRefreshWindowDays": 42, # Default data refresh window on days.
+            # Only meaningful when `data_refresh_type` = `SLIDING_WINDOW`.
+        "supportsMultipleTransfers": True or False, # Indicates whether the data source supports multiple transfers
+            # to different BigQuery targets.
+        "supportsCustomSchedule": True or False, # Specifies whether the data source supports a user defined schedule, or
+            # operates on the default schedule.
+            # When set to `true`, user can override default schedule.
+        "parameters": [ # Data source parameters.
+          { # Represents a data source parameter with validation rules, so that
+              # parameters can be rendered in the UI. These parameters are given to us by
+              # supported data sources, and include all needed information for rendering
+              # and validation.
+              # Thus, whoever uses this api can decide to generate either generic ui,
+              # or custom data source specific forms.
+            "displayName": "A String", # Parameter display name in the user interface.
+            "description": "A String", # Parameter description.
+            "validationDescription": "A String", # Description of the requirements for this field, in case the user input does
+                # not fulfill the regex pattern or min/max values.
+            "fields": [ # When parameter is a record, describes child fields.
+              # Object with schema name: DataSourceParameter
+            ],
+            "required": True or False, # Is parameter required.
+            "allowedValues": [ # All possible values for the parameter.
+              "A String",
+            ],
+            "maxValue": 3.14, # For integer and double values specifies maxminum allowed value.
+            "minValue": 3.14, # For integer and double values specifies minimum allowed value.
+            "repeated": True or False, # Can parameter have multiple values.
+            "recurse": True or False, # If set to true, schema should be taken from the parent with the same
+                # parameter_id. Only applicable when parameter type is RECORD.
+            "validationRegex": "A String", # Regular expression which can be used for parameter validation.
+            "validationHelpUrl": "A String", # URL to a help document to further explain the naming requirements.
+            "paramId": "A String", # Parameter identifier.
+            "type": "A String", # Parameter type.
+            "immutable": True or False, # Cannot be changed after initial creation.
+          },
+        ],
+        "transferType": "A String", # Transfer type. Currently supports only batch transfers,
+            # which are transfers that use the BigQuery batch APIs (load or
+            # query) to ingest the data.
+      },
+    ],
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="list_next">list_next(previous_request, previous_response)</code>
+  <pre>Retrieves the next page of results.
+
+Args:
+  previous_request: The request for the previous page. (required)
+  previous_response: The response from the request for the previous page. (required)
+
+Returns:
+  A request object that you can call 'execute()' on to request the next
+  page. Returns None if there are no more items in the collection.
+    </pre>
+</div>
+
+</body></html>
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