python/src/pywy/platforms/jvm/operator/jvm_sink_textfile.py

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#      http://www.apache.org/licenses/LICENSE-2.0
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from typing import Set, List, Type

from pywy.core.channel import (CH_T, ChannelDescriptor)
from pywy.exception import PywyException
from pywy.operators.sink import TextFileSink
from pywy.platforms.jvm.channels import DISPATCHABLE_CHANNEL_DESCRIPTOR, DispatchableChannel
from pywy.platforms.jvm.operator.jvm_execution_operator import JVMExecutionOperator
from pywy.platforms.jvm.serializable.wayang_jvm_operator import WayangJVMTextFileSink


class JVMTextFileSinkOperator(TextFileSink, JVMExecutionOperator):

    def __init__(self, origin: TextFileSink = None):
        path = None if origin is None else origin.path
        type_class = None if origin is None else origin.inputSlot[0]
        end_line = None if origin is None else origin.end_line
        super().__init__(path, type_class, end_line)

    def execute(self, inputs: List[Type[CH_T]], outputs: List[Type[CH_T]]):
        self.validate_channels(inputs, outputs)

        if isinstance(inputs[0], DispatchableChannel):

            py_in_dispatch_channel: DispatchableChannel = inputs[0]
            operator = py_in_dispatch_channel.provide_dispatchable(do_wrapper=True)

            sink: WayangJVMTextFileSink = WayangJVMTextFileSink(self.name, self.path)

            operator.connect_to(0, sink, 0)

            self.dispatch_operator = sink
        else:
            raise Exception("Channel Type does not supported")

    def get_input_channeldescriptors(self) -> Set[ChannelDescriptor]:
        return {DISPATCHABLE_CHANNEL_DESCRIPTOR}

    def get_output_channeldescriptors(self) -> Set[ChannelDescriptor]:
        raise Exception("The JVMTextFileSink does not support Output Channels")