class Result(object):
    def __init__(self, errors):
        self.errors = errors

    def __str__(self):
        return '\n'.join(self.errors)

    def isValid(self):
        return len(self.errors) == 0


class ValidationResult(Result):
    def __init__(self, data, schema, errors):
        super(ValidationResult, self).__init__(errors)
        self.data = data
        self.schema = schema

    def __str__(self):
        if self.isValid():
            error_str = "'%s' is Valid" % self.data
        else:
            head_line_bits = ["Error validating data"]
            if self.data:
                head_line_bits.append("'{}'".format(self.data))
            if self.schema:
                head_line_bits.append("with schema '{}'".format(self.schema))
            head_line = ' '.join(head_line_bits)
            head_line += '\n\t'
            error_str = head_line + '\n\t'.join(self.errors)
        return error_str