/**
* Converts a document and returns an {@link InputStream}.
*
* @param document The file to convert
* @param mediaType Internet media type of the file
* @param conversionTarget The conversion target to use
* @param customConfig The additional config params to use
* @return Converted document in the specified format
* @see {@link HttpMediaType} for available media types
*/
private InputStream convertDocument(
final File document,
final String mediaType,
final ConversionTarget conversionTarget,
final JsonObject customConfig) {
if (document == null || !document.exists())
throw new IllegalArgumentException("document cannot be null and must exist");
if (customConfig == null) throw new NullPointerException("custom config must not be null");
final String type =
mediaType != null ? mediaType : ConversionUtils.getMediaTypeFromFile(document);
if (type == null) {
throw new RuntimeException("mediaType cannot be null or empty");
} else if (!ConversionUtils.isValidMediaType(type)) {
throw new IllegalArgumentException("file with the given media type is not supported");
}
final JsonObject configJson = new JsonObject();
// Do this since we shouldn't mutate customConfig
for (Map.Entry<String, JsonElement> entry : customConfig.entrySet()) {
configJson.add(entry.getKey(), entry.getValue());
}
// Add or override the conversion target
configJson.addProperty(CONVERSION_TARGET, conversionTarget.toString());
final MediaType mType = MediaType.parse(type);
final RequestBody body =
new MultipartBuilder()
.type(MultipartBuilder.FORM)
.addPart(
Headers.of(HttpHeaders.CONTENT_DISPOSITION, "form-data; name=\"config\""),
RequestBody.create(HttpMediaType.JSON, configJson.toString()))
.addPart(
Headers.of(HttpHeaders.CONTENT_DISPOSITION, "form-data; name=\"file\""),
RequestBody.create(mType, document))
.build();
final Request request =
RequestBuilder.post(CONVERT_DOCUMENT_PATH)
.withQuery(VERSION, versionDate)
.withBody(body)
.build();
final Response response = execute(request);
return ResponseUtil.getInputStream(response);
}
/** Consumes the InputStream, converting it into a String. */
private String responseToString(InputStream is) {
try {
return ConversionUtils.writeInputStreamToString(is);
} finally {
try {
is.close();
} catch (final IOException e) {
LOG.log(Level.WARNING, "Unable to close document input stream", e);
}
}
}