Examples with DataHandlerReader org.apache.axiom.ext.stax.datahandler.DataHandlerReader used on opensource projects

Example 1 with DataHandlerReader

use of org.apache.axiom.ext.stax.datahandler.DataHandlerReader in project webservices-axiom by apache.

the class XMLStreamReaderUtils method getDataHandlerFromElement.

/**
     * Get a {@link DataHandler} for the binary data encoded in an element. The method supports
     * base64 encoded character data as well as optimized binary data through the
     * {@link DataHandlerReader} extension.
     * <p>
     * <em>Precondition</em>: the reader is on a {@link XMLStreamConstants#START_ELEMENT}
     * <p>
     * <em>Postcondition</em>: the reader is on the corresponding
     * {@link XMLStreamConstants#END_ELEMENT}
     * 
     * @param reader the stream to read the data from
     * @return the binary data from the element
     */
public static DataHandler getDataHandlerFromElement(XMLStreamReader reader) throws XMLStreamException {
    int event = reader.next();
    if (event == XMLStreamConstants.END_ELEMENT) {
        // This means that the element is actually empty -> return empty DataHandler
        return new DataHandler(new EmptyDataSource("application/octet-stream"));
    } else if (event != XMLStreamConstants.CHARACTERS) {
        throw new XMLStreamException("Expected a CHARACTER event");
    }
    DataHandlerReader dhr = getDataHandlerReader(reader);
    if (dhr != null && dhr.isBinary()) {
        DataHandler dh = dhr.getDataHandler();
        reader.next();
        return dh;
    } else {
        MemoryBlob blob = Blobs.createMemoryBlob();
        Writer out = new Base64DecodingOutputStreamWriter(blob.getOutputStream());
        try {
            writeTextTo(reader, out);
            // CHARACTERS events
            loop: while (true) {
                switch(reader.next()) {
                    case XMLStreamConstants.CHARACTERS:
                        writeTextTo(reader, out);
                        break;
                    case XMLStreamConstants.END_ELEMENT:
                        break loop;
                    default:
                        throw new XMLStreamException("Expected a CHARACTER event");
                }
            }
            out.close();
        } catch (IOException ex) {
            throw new XMLStreamException("Error during base64 decoding", ex);
        }
        return new DataHandler(new BlobDataSource(blob, "application/octet-string"));
    }
}