Source code for pyarrow.types

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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.

# Tools for dealing with Arrow type metadata in Python


from pyarrow.lib import (is_boolean_value,  # noqa
                         is_integer_value,
                         is_float_value)

import pyarrow.lib as lib


_SIGNED_INTEGER_TYPES = {lib.Type_INT8, lib.Type_INT16, lib.Type_INT32,
                         lib.Type_INT64}
_UNSIGNED_INTEGER_TYPES = {lib.Type_UINT8, lib.Type_UINT16, lib.Type_UINT32,
                           lib.Type_UINT64}
_INTEGER_TYPES = _SIGNED_INTEGER_TYPES | _UNSIGNED_INTEGER_TYPES
_FLOATING_TYPES = {lib.Type_HALF_FLOAT, lib.Type_FLOAT, lib.Type_DOUBLE}
_DECIMAL_TYPES = {lib.Type_DECIMAL128, lib.Type_DECIMAL256}
_DATE_TYPES = {lib.Type_DATE32, lib.Type_DATE64}
_TIME_TYPES = {lib.Type_TIME32, lib.Type_TIME64}
_TEMPORAL_TYPES = {lib.Type_TIMESTAMP,
                   lib.Type_DURATION} | _TIME_TYPES | _DATE_TYPES
_UNION_TYPES = {lib.Type_SPARSE_UNION, lib.Type_DENSE_UNION}
_NESTED_TYPES = {lib.Type_LIST, lib.Type_LARGE_LIST, lib.Type_STRUCT,
                 lib.Type_MAP} | _UNION_TYPES


[docs]def is_null(t): """ Return True if value is an instance of a null type. """ return t.id == lib.Type_NA
def is_boolean(t): """ Return True if value is an instance of a boolean type. """ return t.id == lib.Type_BOOL
[docs]def is_integer(t): """ Return True if value is an instance of any integer type. """ return t.id in _INTEGER_TYPES
[docs]def is_signed_integer(t): """ Return True if value is an instance of any signed integer type. """ return t.id in _SIGNED_INTEGER_TYPES
def is_unsigned_integer(t): """ Return True if value is an instance of any unsigned integer type. """ return t.id in _UNSIGNED_INTEGER_TYPES
[docs]def is_int8(t): """ Return True if value is an instance of an int8 type. """ return t.id == lib.Type_INT8
[docs]def is_int16(t): """ Return True if value is an instance of an int16 type. """ return t.id == lib.Type_INT16
[docs]def is_int32(t): """ Return True if value is an instance of an int32 type. """ return t.id == lib.Type_INT32
[docs]def is_int64(t): """ Return True if value is an instance of an int64 type. """ return t.id == lib.Type_INT64
def is_uint8(t): """ Return True if value is an instance of an uint8 type. """ return t.id == lib.Type_UINT8 def is_uint16(t): """ Return True if value is an instance of an uint16 type. """ return t.id == lib.Type_UINT16 def is_uint32(t): """ Return True if value is an instance of an uint32 type. """ return t.id == lib.Type_UINT32 def is_uint64(t): """ Return True if value is an instance of an uint64 type. """ return t.id == lib.Type_UINT64
[docs]def is_floating(t): """ Return True if value is an instance of a floating point numeric type. """ return t.id in _FLOATING_TYPES
[docs]def is_float16(t): """ Return True if value is an instance of a float16 (half-precision) type. """ return t.id == lib.Type_HALF_FLOAT
[docs]def is_float32(t): """ Return True if value is an instance of a float32 (single precision) type. """ return t.id == lib.Type_FLOAT
[docs]def is_float64(t): """ Return True if value is an instance of a float64 (double precision) type. """ return t.id == lib.Type_DOUBLE
[docs]def is_list(t): """ Return True if value is an instance of a list type. """ return t.id == lib.Type_LIST
[docs]def is_large_list(t): """ Return True if value is an instance of a large list type. """ return t.id == lib.Type_LARGE_LIST
def is_fixed_size_list(t): """ Return True if value is an instance of a fixed size list type. """ return t.id == lib.Type_FIXED_SIZE_LIST
[docs]def is_struct(t): """ Return True if value is an instance of a struct type. """ return t.id == lib.Type_STRUCT
def is_union(t): """ Return True if value is an instance of a union type. """ return t.id in _UNION_TYPES
[docs]def is_nested(t): """ Return True if value is an instance of a nested type. """ return t.id in _NESTED_TYPES
[docs]def is_temporal(t): """ Return True if value is an instance of date, time, timestamp or duration. """ return t.id in _TEMPORAL_TYPES
def is_timestamp(t): """ Return True if value is an instance of a timestamp type. """ return t.id == lib.Type_TIMESTAMP def is_duration(t): """ Return True if value is an instance of a duration type. """ return t.id == lib.Type_DURATION
[docs]def is_time(t): """ Return True if value is an instance of a time type. """ return t.id in _TIME_TYPES
def is_time32(t): """ Return True if value is an instance of a time32 type. """ return t.id == lib.Type_TIME32 def is_time64(t): """ Return True if value is an instance of a time64 type. """ return t.id == lib.Type_TIME64 def is_binary(t): """ Return True if value is an instance of a variable-length binary type. """ return t.id == lib.Type_BINARY
[docs]def is_large_binary(t): """ Return True if value is an instance of a large variable-length binary type. """ return t.id == lib.Type_LARGE_BINARY
def is_unicode(t): """ Alias for is_string. """ return is_string(t)
[docs]def is_string(t): """ Return True if value is an instance of string (utf8 unicode) type. """ return t.id == lib.Type_STRING
[docs]def is_large_unicode(t): """ Alias for is_large_string. """ return is_large_string(t)
[docs]def is_large_string(t): """ Return True if value is an instance of large string (utf8 unicode) type. """ return t.id == lib.Type_LARGE_STRING
[docs]def is_fixed_size_binary(t): """ Return True if value is an instance of a fixed size binary type. """ return t.id == lib.Type_FIXED_SIZE_BINARY
[docs]def is_date(t): """ Return True if value is an instance of a date type. """ return t.id in _DATE_TYPES
[docs]def is_date32(t): """ Return True if value is an instance of a date32 (days) type. """ return t.id == lib.Type_DATE32
[docs]def is_date64(t): """ Return True if value is an instance of a date64 (milliseconds) type. """ return t.id == lib.Type_DATE64
[docs]def is_map(t): """ Return True if value is an instance of a map logical type. """ return t.id == lib.Type_MAP
[docs]def is_decimal(t): """ Return True if value is an instance of a decimal type. """ return t.id in _DECIMAL_TYPES
def is_decimal128(t): """ Return True if value is an instance of a decimal type. """ return t.id == lib.Type_DECIMAL128 def is_decimal256(t): """ Return True if value is an instance of a decimal type. """ return t.id == lib.Type_DECIMAL256
[docs]def is_dictionary(t): """ Return True if value is an instance of a dictionary-encoded type. """ return t.id == lib.Type_DICTIONARY
def is_primitive(t): """ Return True if the value is an instance of a primitive type. """ return lib._is_primitive(t.id)