resdb_driver/transaction.py [1184:1225]:
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        if return_list:
            tx_list = []
            for tx_id, tx in tx_map.items():
                tx_list.append(cls.from_dict(tx))
            return tx_list
        else:
            tx = list(tx_map.values())[0]
            return cls.from_dict(tx)

    type_registry = {}

    @staticmethod
    def register_type(tx_type, tx_class):
        Transaction.type_registry[tx_type] = tx_class

    def resolve_class(operation):
        """! For the given `tx` based on the `operation` key return its implementation class
        """

        create_txn_class = Transaction.type_registry.get(Transaction.CREATE)
        return Transaction.type_registry.get(operation, create_txn_class)

    @classmethod
    def validate_schema(cls, tx):
        # TODO
        pass

    def validate_transfer_inputs(self, resdb, current_transactions=[]):
        # store the inputs so that we can check if the asset ids match
        input_txs = []
        input_conditions = []
        for input_ in self.inputs:
            input_txid = input_.fulfills.txid

            input_tx = resdb.get_transaction(input_txid)

            if input_tx is None:
                for ctxn in current_transactions:
                    if ctxn.id == input_txid:
                        input_tx = ctxn

            if input_tx is None:
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service/sdk_validator/resdb_validator/transaction.py [1268:1306]:
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        if return_list:
            tx_list = []
            for tx_id, tx in tx_map.items():
                tx_list.append(cls.from_dict(tx))
            return tx_list
        else:
            tx = list(tx_map.values())[0]
            return cls.from_dict(tx)

    type_registry = {}

    @staticmethod
    def register_type(tx_type, tx_class):
        Transaction.type_registry[tx_type] = tx_class

    def resolve_class(operation):
        """For the given `tx` based on the `operation` key return its implementation class"""

        create_txn_class = Transaction.type_registry.get(Transaction.CREATE)
        return Transaction.type_registry.get(operation, create_txn_class)

    @classmethod
    def validate_schema(cls, tx):
        pass

    def validate_transfer_inputs(self, resdb, current_transactions=[]):
        # store the inputs so that we can check if the asset ids match
        input_txs = []
        input_conditions = []
        for input_ in self.inputs:
            input_txid = input_.fulfills.txid
            input_tx = resdb.get_transaction(input_txid)

            if input_tx is None:
                for ctxn in current_transactions:
                    if ctxn.id == input_txid:
                        input_tx = ctxn

            if input_tx is None:
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