Passing a DataHandler as a Parameter and returning a DataHandler

["Shrotriya, Sumit" <Su...@westgroup.com>]

Hi All,
 
 I need to pass a DataHandler as a Parameter and return a DataHandler from a
service over Axis....any quick start pointers or ideas?
 
Thanks,
Sumit

 

Re: Passing a DataHandler as a Parameter and returning a DataHandler

[Heitzso <he...@bellsouth.net>]

This worked for me, but caveats:
	haven't tested in awhile
	there may be better ways to do this

====
	/**
	 * @return DataHandler for converted file
	 */
	public DataHandler getConversionFromExtraction(String outputFormat,
String extractionUrlString, String fileName) 
	throws ServiceException {
		
		int numColumns;
		String[] columnNames;
		String[] columnDataTypes;
		String[] dataElements;
		
		try {
			URL url = new URL(extractionUrlString);
			URLConnection urlConnection = url.openConnection();
			// set up connection to request gzip compression
			urlConnection.setRequestProperty("Accept-Encoding", "gzip");
			urlConnection.connect();
			InputStream inputStream = urlConnection.getInputStream();
			if ("gzip".equals(urlConnection.getContentEncoding())) {
				inputStream = new GZIPInputStream(inputStream);
			}
			ExtractionParser extractionParser = new
ExtractionParser(inputStream);
			inputStream.close();
			String errorMessage = extractionParser.getErrorMessage();
			if (errorMessage != null) {
				// byte data[] = errorMessage.getBytes();
				// DataSource dataSource = new ByteArrayDataSource(data,
"text/plain");
				// return new DataHandler(dataSource);
				return new DataHandler(errorMessage, "text/plain");
			}
			numColumns = extractionParser.getNumColumns();
			columnNames = extractionParser.getColumnNames();
			columnDataTypes = extractionParser.getColumnDataTypes();
			dataElements = extractionParser.getDataElements();
		} catch(IOException ioe) {
			// byte data[] = ioe.toString().getBytes();
			// DataSource dataSource = new ByteArrayDataSource(data,
"text/plain");
			// return new DataHandler(dataSource);
			return new DataHandler(ioe.toString(), "text/plain");
		}
		DataHandler dataHandler = getConversion(outputFormat, numColumns, 
						columnNames, columnDataTypes, dataElements, fileName);
		return dataHandler;
	}
====
and the proxy ...
====
	
	public DataHandler getConversionFromExtraction(String outputFormat,
String extractionUrlString, String fileName)
	throws ServiceException, IOException {
		
		DataHandler dataHandler;
		try {
			Service service = new Service();
			Call call = (Call) service.createCall();
			call.setTargetEndpointAddress(serviceURL);
			call.setOperationName(new QName("urn:conversion",
"getConversionFromExtraction"));
			call.addParameter("outputFormat",
org.apache.axis.Constants.XSD_STRING, javax.xml.rpc.ParameterMode.IN);
			call.addParameter("extractionUrlString",
org.apache.axis.Constants.XSD_STRING, javax.xml.rpc.ParameterMode.IN);
			call.addParameter("fileName", org.apache.axis.Constants.XSD_STRING,
javax.xml.rpc.ParameterMode.IN);
			call.setReturnClass(javax.activation.DataHandler.class);
			dataHandler = (DataHandler) call.invoke(
			new Object[] { outputFormat, extractionUrlString, fileName } );
		} catch (Exception e) {
			throw new ServiceException(e.toString());
		}
		return dataHandler;
	}










On Thu, 2002-12-19 at 09:47, Shrotriya, Sumit wrote:
> Hi All,
>  
>  I need to pass a DataHandler as a Parameter and return a DataHandler
> from a service over Axis....any quick start pointers or ideas?
>  
> Thanks,
> Sumit
>          
-- 
Heitzso <he...@bellsouth.net>
MetaMedia, Inc.