[edulid]

If you have to do it yourself, you would implement this via the techniques shown in the Custom Binary field sample and other samples in the same folder: for files being uploaded, use a DMI to replace the InputStream in the inbound DSRequest with a compressed input stream. For files being downloaded, modify DSResponse.data to replace the compressed InputStream returned by the DB with a non-compressed one.

I am trying to implement the insert part, and I am not sure how to replace the InputStream in the inbound DSRequest.

I have done this to test the replacement:

Map<String,Object> values = dsRequest.getValues();
		values.put("f_datei", new String("a").getBytes());
		dsRequest.setValues(values);

So I try to replace the f_datei field (binary) with the bytes from "a". But when uploading a file, I still get the original file.
So how exactly to replace the InputStream? There is no method "dsRequest.setUploadedFileInputStream" or something similar.

[Isomorphic]

Do you also have a call to clearUploadedFiles() to get rid of the originally uploaded file?

[edulid]

No, thanks, adding it helped.

Now I am trying to do the fetch-part, but I have the same problem: the file downloaded is the compressed file. Is there some similar API ?

The code I am using is:

public DSResponse executeFetch(DSRequest dsRequest) throws Exception {
		LOG.info("Executing Fetch: DokumenteDMIHandler");

		DSResponse response = dsRequest.execute();
		if (!(response.getData() instanceof Map)) {
			return response;
		}

		InputStream compressedInputStream = (InputStream) ((Map) response
				.getData()).get("f_datei");
		if (compressedInputStream == null) {
			return response;
		}
		LOG.info("Replacing content with uncompressed file");
		InputStream decompressedInputStream = Utils
				.bzip2Decompress(compressedInputStream);
		((Map) response.getData()).put("f_datei", decompressedInputStream);
		return response;

	}

The replacement is done here: ((Map) response.getData()).put("f_datei", decompressedInputStream);
but I still get the compressed data downloaded. Is there something similar to "clearUploadedFiles()" here?

[edulid]

The data is a list, not a map.
I think this solves the problem.