Source code for matrixb.rowmap

# file matrixb/rowmap.py

# Copyright (c) 2019-2020 Kevin Crouse
#
# Licensed 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.
#
# @license: http://www.apache.org/licenses/LICENSE-2.0
# @author: Kevin Crouse (krcrouse@gmail.com)

from .iterator import MatrixIterator

class MatrixRowmap(MatrixIterator):
    """ Defines a subclass of the MatrixIterator when the rowmap is called instead of a strict matrix iteration. """

    def __next__(self):
        return(self._process_row(super().__next__()))

    def top(self):
        return(self._process_row(super().top()))

    def _process_row(self, row):
        """ Use the matrix's current colmap to process the row, and handle duplicate columns as necessary. Note that this references the matrix's column map on each iteration in case the user changes column definitions between calls."""
        result = {}
        for col, index in self.matrix.colmap.items():
            if type(index) is list:
                result[col] = [row[i] for i in index ]
            else:
                result[col] = row[index]
        return(result)