def move_row(self, identifier: str, row_id: str, position: int,
datastore: Datastore) -> VizualApiResult:
"""Move a row within a given dataset.
Raises ValueError if no dataset with given identifier exists or if the
specified row or position is not within the range of the dataset.
Parameters
----------
identifier: string
Unique dataset identifier
row_id: int
Global row identifier for deleted row
position: int
Target position for the row
datastore : vizier.datastore.fs.base.FileSystemDatastore
Datastore to retireve and update datasets
Returns
-------
vizier.engine.packages.vizual.api.VizualApiResult
"""
# Get dataset. Raise exception if dataset is unknown
dataset = datastore.get_dataset(identifier)
if dataset is None:
raise ValueError('unknown dataset \'' + identifier + '\'')
command = {"id": "moveRow", "row": row_id, "position": position}
response = mimir.vizualScript(dataset.identifier, command)
return VizualApiResult.from_mimir(response)
def delete_row(self, identifier: str, row_index: str,
datastore: Datastore) -> VizualApiResult:
"""Delete a row in a given dataset.
Raises ValueError if no dataset with given identifier exists or if the
specified row is not within the range of the dataset.
Parameters
----------
identifier: string
Unique dataset identifier
row_index: int
Row index for deleted row
datastore : vizier.datastore.fs.base.FileSystemDatastore
Datastore to retireve and update datasets
Returns
-------
vizier.engine.packages.vizual.api.VizualApiResult
"""
# Get dataset. Raise exception if dataset is unknown
dataset = datastore.get_dataset(identifier)
if dataset is None:
raise ValueError('unknown dataset \'' + identifier + '\'')
assert (isinstance(dataset, MimirDatasetHandle))
# Create a view for the modified dataset
col_list = []
for col in dataset.columns:
assert (isinstance(col, MimirDatasetColumn))
col_list.append(col.name_in_rdb)
command = {"id": "deleteRow", "row": int(row_index)}
response = mimir.vizualScript(dataset.identifier, command)
return VizualApiResult.from_mimir(response)
def delete_column(self, identifier: str, column_id: int,
datastore: Datastore) -> VizualApiResult:
"""Delete a column in a given dataset.
Raises ValueError if no dataset with given identifier exists or if the
specified column is unknown.
Parameters
----------
identifier: string
Unique dataset identifier
column_id: int
Unique column identifier
datastore : vizier.datastore.fs.base.FileSystemDatastore
Datastore to retireve and update datasets
Returns
-------
vizier.engine.packages.vizual.api.VizualApiResult
"""
# Get dataset. Raise exception if dataset is unknown
dataset = datastore.get_dataset(identifier)
if dataset is None:
raise ValueError('unknown dataset \'' + identifier + '\'')
# Confirm that the column actually exists and convert the column_identifier to
# a position in the schema (usually ==, but not guaranteed)
col_index = get_index_for_column(dataset, column_id)
command = {"id": "deleteColumn", "column": col_index}
response = mimir.vizualScript(dataset.identifier, command)
return VizualApiResult.from_mimir(response, identifier)
def insert_row(self, identifier: str, position: int,
datastore: Datastore) -> VizualApiResult:
"""Insert row at given position in a dataset.
Raises ValueError if no dataset with given identifier exists or if the
specified row psotion isoutside the dataset bounds.
Parameters
----------
identifier: string
Unique dataset identifier
position: int
Index position at which the row will be inserted
datastore : vizier.datastore.fs.base.FileSystemDatastore
Datastore to retireve and update datasets
Returns
-------
vizier.engine.packages.vizual.api.VizualApiResult
"""
# Get dataset. Raise exception if dataset is unknown
dataset = datastore.get_dataset(identifier)
if dataset is None:
raise ValueError('unknown dataset \'' + identifier + '\'')
command = {"id": "insertRow", "position": position}
response = mimir.vizualScript(dataset.identifier, command)
return VizualApiResult.from_mimir(response)
def filter_columns(self, identifier: str, columns: List[int],
names: List[str],
datastore: Datastore) -> VizualApiResult:
"""Dataset projection operator. Returns a copy of the dataset with the
given identifier that contains only those columns listed in columns.
The list of names contains optional new names for the filtered columns.
A value of None in names indicates that the name of the corresponding
column is not changed.
Raises ValueError if no dataset with given identifier exists or if any
of the filter columns are unknown.
Parameters
----------
identifier: string
Unique dataset identifier
columns: list(int)
List of column identifier for columns in the result.
names: list(string)
Optional new names for filtered columns.
datastore : vizier.datastore.fs.base.FileSystemDatastore
Datastore to retireve and update datasets
Returns
-------
vizier.engine.packages.vizual.api.VizualApiResult
"""
# Get dataset. Raise exception if dataset is unknown
dataset = datastore.get_dataset(identifier)
if dataset is None:
raise ValueError('unknown dataset \'' + identifier + '\'')
# The schema of the new dataset only contains the columns in the given
# list. A column might need to be renamed.
schema = list()
column_mapping = list()
col_list = []
for i in range(len(columns)):
col_idx = get_index_for_column(dataset, columns[i])
col = dataset.columns[col_idx]
if not names[i] is None:
if not is_valid_name(names[i]):
raise ValueError('invalid column name \'' + str(names[i]) +
'\'')
schema.append(
MimirDatasetColumn(identifier=col.identifier,
name_in_dataset=names[i],
name_in_rdb=names[i]))
else:
schema.append(col)
column_mapping.append({
"columns_column": col_idx,
"columns_name": schema[-1].name
})
col_list.append(col.name_in_rdb)
command = {"id": "projection", "columns": column_mapping}
response = mimir.vizualScript(dataset.identifier, command)
return VizualApiResult.from_mimir(response)
def move_column(self, identifier: str, column_id: int, position: int,
datastore: Datastore) -> VizualApiResult:
"""Move a column within a given dataset.
Raises ValueError if no dataset with given identifier exists or if the
specified column is unknown or the target position invalid.
Parameters
----------
identifier: string
Unique dataset identifier
column_id: int
Unique column identifier
position: int
Target position for the column
datastore : vizier.datastore.fs.base.FileSystemDatastore
Datastore to retireve and update datasets
Returns
-------
vizier.engine.packages.vizual.api.VizualApiResult
"""
# Get dataset. Raise exception if dataset is unknown
dataset = datastore.get_dataset(identifier)
if dataset is None:
raise ValueError('unknown dataset \'' + identifier + '\'')
# Make sure that position is a valid column index in the new dataset
if position < 0 or position > len(dataset.columns):
raise ValueError('invalid target position \'' + str(position) +
'\'')
# Get index position of column that is being moved
source_idx = get_index_for_column(dataset, column_id)
# No need to do anything if source position equals target position
if source_idx != position:
# Keep the mimir-side schema aligned with the vizier-side schema
command = {
"id": "moveColumn",
"column": source_idx,
"position": position
}
response = mimir.vizualScript(dataset.identifier, command)
return VizualApiResult.from_mimir(response)
else:
return VizualApiResult(dataset)
def insert_column(self, identifier: str, position: int, name: str,
datastore: Datastore) -> VizualApiResult:
"""Insert column with given name at given position in dataset.
Raises ValueError if no dataset with given identifier exists, if the
specified column position is outside of the current schema bounds, or if
the column name is invalid.
Parameters
----------
identifier: string
Unique dataset identifier
position: int
Index position at which the column will be inserted
name: string, optional
New column name
datastore : vizier.datastore.fs.base.FileSystemDatastore
Datastore to retireve and update datasets
Returns
-------
vizier.engine.packages.vizual.api.VizualApiResult
"""
# Raise ValueError if given colum name is invalid
if not is_valid_name(name):
raise ValueError('invalid column name \'' + str(name) + '\'')
# Get dataset. Raise exception if dataset is unknown
dataset = datastore.get_dataset(identifier)
if dataset is None:
raise ValueError('unknown dataset \'' + identifier + '\'')
# Make sure that position is a valid column index in the new dataset
if position < 0 or position > len(dataset.columns):
raise ValueError('invalid column index \'' + str(position) + '\'')
# Get identifier for new column
col_id = dataset.max_column_id() + 1
# Insert new column into schema
schema = list(dataset.columns)
new_column = MimirDatasetColumn(col_id, name, name)
schema.insert(position, new_column)
command = {"id": "insertColumn", "name": name, "position": position}
response = mimir.vizualScript(dataset.identifier, command)
return VizualApiResult.from_mimir(response)
def update_cell(self, identifier: str, column_id: int, row_id: str,
value: str, datastore: Datastore) -> VizualApiResult:
"""Update a cell in a given dataset.
Raises ValueError if no dataset with given identifier exists or if the
specified cell is outside of the current dataset ranges.
Parameters
----------
identifier : string
Unique dataset identifier
column_id: int
Unique column identifier for updated cell
row_id: int
Unique row identifier
value: string
New cell value
datastore : vizier.datastore.fs.base.FileSystemDatastore
Datastore to retireve and update datasets
Returns
-------
vizier.engine.packages.vizual.api.VizualApiResult
"""
# Get dataset. Raise exception if dataset is unknown
dataset = datastore.get_dataset(identifier)
if dataset is None:
raise ValueError('unknown dataset \'' + identifier + '\'')
# Get the index of the specified cell column
col_index = get_index_for_column(dataset, column_id)
# Raise exception if row id is not valid
command = {
"id": "updateCell",
"column": col_index,
"row": row_id,
"value": str(value) if value is not None else None
}
response = mimir.vizualScript(dataset.identifier, command)
return VizualApiResult.from_mimir(response)
def rename_column(self, identifier: str, column_id: int, name: str,
datastore: Datastore) -> VizualApiResult:
"""Rename column in a given dataset.
Raises ValueError if no dataset with given identifier exists, if the
specified column is unknown, or if the given column name is invalid.
Parameters
----------
identifier: string
Unique dataset identifier
column_id: int
Unique column identifier
name: string
New column name
datastore : vizier.datastore.fs.base.FileSystemDatastore
Datastore to retireve and update datasets
Returns
-------
vizier.engine.packages.vizual.api.VizualApiResult
"""
# Raise ValueError if given colum name is invalid
if not is_valid_name(name):
raise ValueError('invalid column name \'' + str(name) + '\'')
# Get dataset. Raise exception if dataset is unknown
dataset = datastore.get_dataset(identifier)
if dataset is None:
raise ValueError('unknown dataset \'' + identifier + '\'')
# Get the specified column that is to be renamed and set the column name
# to the new name
target_col_index = get_index_for_column(dataset, column_id)
command = {
"id": "renameColumn",
"column": target_col_index,
"name": name
}
response = mimir.vizualScript(dataset.identifier, command)
return VizualApiResult.from_mimir(response)