support path for getSchemaByDataFileAsSmvSchema

[cloudysail]

There are two places using self.inputDir() as below. Shall we pass a parameter path so that we don't always rely on the default self.inputDir()?

def getSchemaByDataFileAsSmvSchema(self, data_file_name):
        """Get the schema of a data file from its path and returns a Scala SmvSchema instance.
           The result will be None if the corresponding schema file does not exist or is invalid.
        """
        data_file_path = os.path.join(self.inputDir(), data_file_name)
        return self.j_smvPyClient.readSchemaFromDataPathAsSmvSchema(data_file_path)

    def getFileNamesByType(self, ftype):
        """Return a list of file names which has the postfix ftype
        """
        all_files = self._jvm.SmvPythonHelper.getDirList(self.inputDir())
        return [str(f) for f in all_files if f.endswith(ftype)]

[ninjapapa]

I do think both of those 2 api method should be deprecated. The first one may be later, but the second one I don't think we are using it any more.

[cloudysail]

Talked with @ninjapapa, for short term, we would improve the getSchemaByDataFileAsSmvSchema by supporting 'path' parameter.