package at.gv.egovernment.moa.spss; import java.io.PrintStream; import java.io.PrintWriter; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import org.w3c.dom.DOMImplementation; import org.w3c.dom.Document; import org.w3c.dom.Element; import at.gv.egovernment.moa.util.Constants; import at.gv.egovernment.moa.spss.util.MessageProvider; /** * Base class of MOA specific exceptions. * * This class has the ability to wrap other exceptions which may be seen * as the root cause for this exception. A similar mechanism is in place * since JDK1.4 (see the getClause() method) but will not be used * because of required compatibility with JDK1.3. * * @author Patrick Peck * @version $Id$ */ public abstract class MOAException extends Exception { /** The message ID. */ private String messageId; /** The wrapped Throwable. */ private Throwable wrapped; /** * Create a MOAException. * * @param messageId The message ID of the message contained in the created * MOAException. * @param parameters The parameters needed to fill in the message arguments. */ public MOAException(String messageId, Object[] parameters) { super(MessageProvider.getInstance().getMessage(messageId, parameters)); this.messageId = messageId; } /** * Create a MOAException. * * @param messageId The message ID of the message contained in the created * MOAException. * @param parameters The parameters needed to fill in the message arguments. * @param wrapped The exception wrapped by the created * MOAException. */ public MOAException(String messageId, Object[] parameters, Throwable wrapped) { super(MessageProvider.getInstance().getMessage(messageId, parameters)); this.messageId = messageId; this.wrapped = wrapped; } /** * Returns the message ID of this exception. * * @return The message ID as provided in the constructor. */ public String getMessageId() { return messageId; } /** * Returns the exception wrapped by this MOAException. * * @return The exception wrapped by this exception. Possibly * null, if none was provided at construction time. */ public Throwable getWrapped() { return wrapped; } /** * Convert this MOAException to an ErrorResponse * element from the MOA namespace. * * @return An ErrorResponse element, containing the subelements * ErrorCode and Info required by the MOA schema. */ public Element toErrorResponse() { DocumentBuilder builder; DOMImplementation impl; Document doc; Element errorResponse; Element errorCode; Element info; // create a new document try { builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); impl = builder.getDOMImplementation(); } catch (ParserConfigurationException e) { return null; } // build the ErrorResponse element doc = impl.createDocument(Constants.MOA_NS_URI, "ErrorResponse", null); errorResponse = doc.getDocumentElement(); // add MOA namespace declaration errorResponse.setAttributeNS( Constants.XMLNS_NS_URI, "xmlns", Constants.MOA_NS_URI); // build the child elements errorCode = doc.createElementNS(Constants.MOA_NS_URI, "ErrorCode"); errorCode.appendChild(doc.createTextNode(messageId)); info = doc.createElementNS(Constants.MOA_NS_URI, "Info"); info.appendChild(doc.createTextNode(getMessage())); errorResponse.appendChild(errorCode); errorResponse.appendChild(info); return errorResponse; } /** * Print a stack trace of this exception to System.err. * * @see java.lang.Throwable#printStackTrace() */ public void printStackTrace() { printStackTrace(System.err); } /** * Print a stack trace of this exception, including the wrapped exception. * * @param s The stream to write the stack trace to. * @see java.lang.Throwable#printStackTrace(java.io.PrintStream) */ public void printStackTrace(PrintStream s) { super.printStackTrace(s); if (getWrapped() != null) { s.print("Caused by: "); getWrapped().printStackTrace(s); } } /** * Print a stack trace of this exception, including the wrapped exception. * * @param s The stream to write the stacktrace to. * @see java.lang.Throwable#printStackTrace(java.io.PrintWriter) */ public void printStackTrace(PrintWriter s) { super.printStackTrace(s); if (getWrapped() != null) { s.print("Caused by: "); getWrapped().printStackTrace(s); } } }