Examples of org.ozoneDB.ExternalTransaction

org.ozoneDB.ExternalTransaction
twarebuero.de/">SMB @version $Revision: 1.1 $Date: 2001/12/18 10:31:30 $

    *
    * @param content The new content value
    */
    public void setContent( Object value ) throws XMLDBException {
        if (value instanceof String) {   
            ExternalTransaction tx = database.newTransaction();            
            // we assume it's a valid XML doc and parse it
            try {                
                StringReader in = new StringReader((String)value);
                InputSource source = new InputSource(in);
                SAXParser parser = parserFactory.newSAXParser();
                ParserAdapter adapter = new ParserAdapter( parser.getParser() );
                tx.begin();
                adapter.setContentHandler( container.storeSAX() );
                adapter.parse( source );
                tx.commit();
            }
            catch (SAXException e) {
                try {
                    if (tx.getStatus() == tx.STATUS_ACTIVE)
                        tx.rollback();
                    throw new XMLDBException(ErrorCodes.INVALID_RESOURCE, e.getMessage());  
                }
                catch (Exception rollbackException) {
                    throw new XMLDBException(ErrorCodes.VENDOR_ERROR, rollbackException.toString());  
                }
            }
            catch (Exception e) {
                try {
                    if (tx.getStatus() == tx.STATUS_ACTIVE)
                        tx.rollback();
                    throw new XMLDBException(ErrorCodes.VENDOR_ERROR, e.getMessage());  
                }
                catch (Exception rollbackException) {
                    throw new XMLDBException(ErrorCodes.VENDOR_ERROR, rollbackException.toString());  
                }

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    * Returns the content of the <code>Resource</code> as a DOM Node.
    *
    * @return The XML content as a DOM <code>Node</code>
    */
    public Node getContentAsDOM() throws XMLDBException {
        ExternalTransaction tx = database.newTransaction();        
        try {            
            tx.begin();
            DocumentBuilderFactory builderFactory = new org.apache.xerces.jaxp.DocumentBuilderFactoryImpl();            
            DocumentBuilder documentBuilder = builderFactory.newDocumentBuilder();
            Document doc = container.extractDOM(documentBuilder.newDocument());            
            tx.commit();
            return doc;
        }
        catch (Exception e) {
            try {
                if (tx.getStatus() == tx.STATUS_ACTIVE)
                    tx.rollback();
                throw new XMLDBException( ErrorCodes.VENDOR_ERROR, e.getMessage());
            }
            catch (Exception rollbackException) {
                throw new XMLDBException(ErrorCodes.VENDOR_ERROR, rollbackException.toString());  
            }

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    * source.
    *
    * @param content The new content value
    */
    public void setContentAsDOM( Node content ) throws XMLDBException {   
        ExternalTransaction tx = database.newTransaction();             
        try {            
            if (content == null) {
                System.out.println("XMLResourceImpl.setContentAsDOM() - Content is null");
                throw new XMLDBException(ErrorCodes.INVALID_RESOURCE);
            } 
            if (content instanceof Document) {
                Document doc = (Document)content;  
                tx.begin();       
                container.storeDOM(doc);                
                tx.commit();
            }
            else {
                System.out.println("Cannot store Nodes right now, must be a Document");
            }                            
        }
        catch (Exception e) {
            e.printStackTrace();            
            try {
                System.out.println("XMLResourceImpl.setContentAsDOM() - Transaction status is " + tx.getStatus());
                if (tx.getStatus() == tx.STATUS_ACTIVE)
                    tx.rollback();
                throw new XMLDBException( ErrorCodes.VENDOR_ERROR, e.getMessage());
            }
            catch (Exception rollbackException) {
                throw new XMLDBException(ErrorCodes.VENDOR_ERROR, rollbackException.getMessage());  
            }

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    *
    * @param handler the SAX <code>ContentHandler</code> to use to handle the
    *  <code>Resource</code> content.    
    */
    public void getContentAsSAX( ContentHandler handler ) throws XMLDBException {
        ExternalTransaction tx = database.newTransaction();        
        try {
            tx.begin();
            container.extractSAX(handler);
            tx.commit();
        }
        catch (Exception e) {
            try {
                if (tx.getStatus() == tx.STATUS_ACTIVE)
                    tx.rollback();            
                throw new XMLDBException( ErrorCodes.VENDOR_ERROR, e.getMessage());
            }
            catch (Exception rollbackException) {
                throw new XMLDBException(ErrorCodes.VENDOR_ERROR, rollbackException.toString());  
            }

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    *
    * @return a SAX <code>ContentHandler</code> that can be used to add content
    *  into the <code>Resource</code>.
    */
    public ContentHandler setContentAsSAX() throws XMLDBException {
        ExternalTransaction tx = database.newTransaction();                
        try {  
            tx.begin();
            ContentHandler handler = container.storeSAX();
            tx.commit();
            return handler;
        }
        catch (Exception e) {
            try {
                if (tx.getStatus() == tx.STATUS_ACTIVE)
                    tx.rollback(); 
                throw new XMLDBException( ErrorCodes.VENDOR_ERROR, e.getMessage());
            }
            catch (Exception rollbackException) {
                throw new XMLDBException(ErrorCodes.VENDOR_ERROR, rollbackException.toString());  
            }

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     *  Example: String content = toString( "xml", "UTF-8", true );
     * 
     */  
    private String toString(String type, String encoding, boolean indenting) throws Exception {        
        int depth = -1;
        ExternalTransaction tx = database.newTransaction();
        tx.begin();
        try {
            StringWriter writer = new StringWriter();
            XMLSerializer serializer = new XMLSerializer( writer, new OutputFormat(type, encoding, indenting) );
            ContentHandler handler = serializer.asContentHandler();
            container.extractSAX( handler, null, depth );
            writer.flush();
            tx.commit();
            return writer.toString();
        } 
        catch (Exception e) {
            if (tx.getStatus() == tx.STATUS_ACTIVE)
                tx.rollback();
            throw e;
        } 
    }

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