# Source code for renku.core.models.cwl.workflow

    # -*- coding: utf-8 -*-
    #
    # Copyright 2018-2021- Swiss Data Science Center (SDSC)
    # A partnership between École Polytechnique Fédérale de Lausanne (EPFL) and
    # Eidgenössische Technische Hochschule Zürich (ETHZ).
    #
    # 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.
    """Represent workflows from the Common Workflow Language."""

    import uuid

    import attr

    from renku.core.models.workflow.run import Run

    def convert_run(value):
        """Convert value to CWLClass if dict is given."""
        if isinstance(value, dict):
            return Run.from_jsonld(value)
        return value

    @attr.s
    class WorkflowStep(object):
        """Define an executable element of a workflow."""

        run = attr.ib(converter=convert_run)  # string, Process
        id = attr.ib(default=attr.Factory(uuid.uuid4))

        in_ = attr.ib(default=None)
        out = attr.ib(default=None)

    @attr.s
    class Workflow(object):
        """Define a workflow representation."""

        steps = attr.ib(default=attr.Factory(list))

        def add_step(self, **kwargs):
            """Add a workflow step."""
            self.steps.append(WorkflowStep(**kwargs))