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package com.sun.xml.ws.message.stream;
import com.sun.xml.stream.buffer.MutableXMLStreamBuffer;
import com.sun.xml.ws.api.message.Message;
import com.sun.xml.ws.api.model.wsdl.WSDLPort;
import com.sun.xml.ws.api.pipe.StreamSOAPCodec;
import java.io.IOException;
import javax.xml.soap.SOAPException;
import javax.xml.soap.SOAPMessage;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamReader;
import com.sun.istack.NotNull;
import com.sun.istack.Nullable;
import com.sun.xml.bind.api.Bridge;
import com.sun.xml.ws.api.message.AttachmentSet;
import com.sun.xml.ws.api.message.HeaderList;
import com.sun.xml.wss.jaxws.impl.logging.LogDomainConstants;
import java.util.logging.Logger;
import org.xml.sax.ContentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.transform.Source;
/**
*
* @author K.Venugopal@sun.com
*/
public class LazyStreamBasedMessage extends Message{
protected static final Logger logger =
Logger.getLogger(
LogDomainConstants.WSS_JAXWS_IMPL_DOMAIN,
LogDomainConstants.WSS_JAXWS_IMPL_DOMAIN_BUNDLE);
private StreamSOAPCodec codec = null;
private boolean readMessage = false;
private XMLStreamReader reader = null;
private Message message = null;
private MutableXMLStreamBuffer buffer = null;
/** Creates a new instance of StreamMessage */
public LazyStreamBasedMessage(XMLStreamReader message,StreamSOAPCodec codec) {
this.reader = message;
this.codec = codec;
}
public StreamSOAPCodec getCodec(){
return codec;
}
private synchronized void cacheMessage(){
if(!readMessage){
message = codec.decode(reader);
readMessage = true;
}
}
/**
* Returns true if headers are present in the message.
*
* @return
* true if headers are present.
*/
public boolean hasHeaders(){
if(!readMessage){
cacheMessage();
}
return message.hasHeaders();
}
/**
* Gets all the headers of this message.
*
* <h3>Implementation Note</h3>
* <p>
* {@link Message} implementation is allowed to defer
* the construction of {@link HeaderList} object. So
* if you only want to check for the existence of any header
* element, use {@link #hasHeaders()}.
*
* @return
* always return the same non-null object.
*/
public HeaderList getHeaders(){
if(!readMessage){
cacheMessage();
}
return message.getHeaders();
}
/**
* Gets the attachments of this message
* (attachments live outside a message.)
*/
public @NotNull AttachmentSet getAttachments() {
if(!readMessage){
cacheMessage();
}
return message.getAttachments();
}
/**
* Returns true if this message is a request message for a
* one way operation according to the given WSDL. False otherwise.
*
* <p>
* This method is functionally equivalent as doing
* {@code getOperation(port).getOperation().isOneWay()}
* (with proper null check and all.) But this method
* can sometimes work faster than that (for example,
* on the client side when used with SEI.)
*
* @param port
* {@link Message}s are always created under the context of
* one {@link WSDLPort} and they never go outside that context.
* Pass in that "governing" {@link WSDLPort} object here.
* We chose to receive this as a parameter instead of
* keeping {@link WSDLPort} in a message, just to save the storage.
*
* <p>
* The implementation of this method involves caching the return
* value, so the behavior is undefined if multiple callers provide
* different {@link WSDLPort} objects, which is a bug of the caller.
*/
public boolean isOneWay(@NotNull WSDLPort port) {
if(!readMessage){
cacheMessage();
}
return message.isOneWay(port);
}
/**
* Gets the local name of the payload element.
*
* @return
* null if a {@link Message} doesn't have any payload.
*/
public @Nullable String getPayloadLocalPart(){
if(!readMessage){
cacheMessage();
}
return message.getPayloadLocalPart();
}
/**
* Gets the namespace URI of the payload element.
*
* @return
* null if a {@link Message} doesn't have any payload.
*/
public String getPayloadNamespaceURI(){
if(!readMessage){
cacheMessage();
}
return message.getPayloadNamespaceURI();
}
// I'm not putting @Nullable on it because doing null check on getPayloadLocalPart() should be suffice
/**
* Returns true if a {@link Message} has a payload.
*
* <p>
* A message without a payload is a SOAP message that looks like:
* <pre><xmp>
* <S:Envelope>
* <S:Header>
* ...
* </S:Header>
* <S:Body />
* </S:Envelope>
* </xmp></pre>
*/
public boolean hasPayload(){
if(!readMessage){
cacheMessage();
}
return message.hasPayload();
}
/**
* Returns true if this message is a fault.
*
* <p>
* Just a convenience method built on {@link #getPayloadNamespaceURI()}
* and {@link #getPayloadLocalPart()}.
*/
public boolean isFault() {
return false;
// if(!readMessage){
// cacheMessage();
// }
// return message.isFault();
}
/**
* Consumes this message including the envelope.
* returns it as a {@link Source} object.
*/
public Source readEnvelopeAsSource(){
if(!readMessage){
cacheMessage();
}
return message.readEnvelopeAsSource();
}
/**
* Returns the payload as a {@link Source} object.
*
* This consumes the message.
*
* @return
* if there's no payload, this method returns null.
*/
public Source readPayloadAsSource(){
if(!readMessage){
cacheMessage();
}
return message.readPayloadAsSource();
}
/**
* Creates the equivalent {@link SOAPMessage} from this message.
*
* This consumes the message.
*
* @throws SOAPException
* if there's any error while creating a {@link SOAPMessage}.
*/
public SOAPMessage readAsSOAPMessage() throws SOAPException{
if(!readMessage){
cacheMessage();
}
return message.readAsSOAPMessage();
}
/**
* Reads the payload as a JAXB object by using the given unmarshaller.
*
* This consumes the message.
*
* @throws JAXBException
* If JAXB reports an error during the processing.
*/
public <T> T readPayloadAsJAXB(Unmarshaller unmarshaller) throws JAXBException{
if(!readMessage){
cacheMessage();
}
throw new UnsupportedOperationException();
}
/**
* Reads the payload as a JAXB object according to the given {@link Bridge}.
*
* This consumes the message.
*
* @throws JAXBException
* If JAXB reports an error during the processing.
*/
public <T> T readPayloadAsJAXB(Bridge<T> bridge) throws JAXBException{
if(!readMessage){
cacheMessage();
}
return message.readPayloadAsJAXB(bridge);
}
/**
* Reads the payload as a {@link XMLStreamReader}
*
* This consumes the message.
*
* @return
* If there's no payload, this method returns null.
* Otherwise always non-null valid {@link XMLStreamReader} that points to
* the payload tag name.
*/
public XMLStreamReader readPayload() throws XMLStreamException{
if(!readMessage){
cacheMessage();
}
return message.readPayload();
}
/**
* Writes the payload to StAX.
*
* This method writes just the payload of the message to the writer.
* This consumes the message.
* The implementation will not write
* {@link XMLStreamWriter#writeStartDocument()}
* nor
* {@link XMLStreamWriter#writeEndDocument()}
*
* <p>
* If there's no payload, this method is no-op.
*
* @throws XMLStreamException
* If the {@link XMLStreamWriter} reports an error,
* or some other errors happen during the processing.
*/
public void writePayloadTo(XMLStreamWriter sw) throws XMLStreamException{
if(!readMessage){
cacheMessage();
}
message.writePayloadTo(sw);
}
/**
* Writes the whole SOAP message (but not attachments)
* to the given writer.
*
* This consumes the message.
*
* @throws XMLStreamException
* If the {@link XMLStreamWriter} reports an error,
* or some other errors happen during the processing.
*/
public void writeTo(XMLStreamWriter sw) throws XMLStreamException{
if(!readMessage){
cacheMessage();
}
message.writeTo(sw);
}
/**
* Writes the whole SOAP envelope as SAX events.
*
* <p>
* This consumes the message.
*
* @param contentHandler
* must not be nulll.
* @param errorHandler
* must not be null.
* any error encountered during the SAX event production must be
* first reported to this error handler. Fatal errors can be then
* thrown as {@link SAXParseException}. {@link SAXException}s thrown
* from {@link ErrorHandler} should propagate directly through this method.
*/
public void writeTo( ContentHandler contentHandler, ErrorHandler errorHandler ) throws SAXException{
if(!readMessage){
cacheMessage();
}
message.writeTo(contentHandler,errorHandler);
}
// TODO: do we need a method that reads payload as a fault?
// do we want a separte streaming representation of fault?
// or would SOAPFault in SAAJ do?
/**
* Creates a copy of a {@link Message}.
*
* <p>
* This method creates a new {@link Message} whose header/payload/attachments/properties
* are identical to this {@link Message}. Once created, the created {@link Message}
* and the original {@link Message} behaves independently --- adding header/
* attachment to one {@link Message} doesn't affect another {@link Message}
* at all.
*
* <p>
* This method does <b>NOT</b> consume a message.
*
* <p>
* To enable efficient copy operations, there's a few restrictions on
* how copied message can be used.
*
* <ol>
* <li>The original and the copy may not be
* used concurrently by two threads (this allows two {@link Message}s
* to share some internal resources, such as JAXB marshallers.)
* Note that it's OK for the original and the copy to be processed
* by two threads, as long as they are not concurrent.
*
* <li>The copy has the same 'life scope'
* as the original (this allows shallower copy, such as
* JAXB beans wrapped in {@link JAXBMessage}.)
* </ol>
*
* <p>
* A 'life scope' of a message created during a message processing
* in a pipeline is until a pipeline processes the next message.
* A message cannot be kept beyond its life scope.
*
* (This experimental design is to allow message objects to be reused
* --- feedback appreciated.)
*
*
*
* <h3>Design Rationale</h3>
* <p>
* Since a {@link Message} body is read-once, sometimes
* (such as when you do fail-over, or WS-RM) you need to
* create an idential copy of a {@link Message}.
*
* <p>
* The actual copy operation depends on the layout
* of the data in memory, hence it's best to be done by
* the {@link Message} implementation itself.
*
* <p>
* The restrictions placed on the use of copied {@link Message} can be
* relaxed if necessary, but it will make the copy method more expensive.
*/
// TODO: update the class javadoc with 'lifescope'
// and move the discussion about life scope there.
public Message copy(){
if(!readMessage){
cacheMessage();
}
return message.copy();
}
public XMLStreamReader readMessage(){
if (!readMessage) {
return reader;
}
if (buffer == null) {
try {
buffer = new com.sun.xml.stream.buffer.MutableXMLStreamBuffer();
javax.xml.stream.XMLStreamWriter writer = buffer.createFromXMLStreamWriter();
message.writeTo(writer);
} catch (javax.xml.stream.XMLStreamException ex) {
logger.log(java.util.logging.Level.SEVERE,LogStringsMessages.WSSMSG_0001_PROBLEM_CACHING(),ex);
}
}
try {
reader = buffer.readAsXMLStreamReader();
return reader;
} catch (XMLStreamException ex) {
logger.log(java.util.logging.Level.SEVERE,LogStringsMessages.WSSMSG_0002_ERROR_READING_BUFFER(),ex);
}
return null;
}
public void print() throws XMLStreamException{
if(readMessage){
try {
message.readAsSOAPMessage().writeTo(java.lang.System.out);
return;
} catch (SOAPException ex) {
logger.log(java.util.logging.Level.SEVERE,
LogStringsMessages.WSSMSG_0003_ERROR_PRINT(),ex);
} catch (IOException ex) {
logger.log(java.util.logging.Level.SEVERE,
LogStringsMessages.WSSMSG_0003_ERROR_PRINT(),ex);
}
}
if(buffer == null){
buffer = new MutableXMLStreamBuffer();
buffer.createFromXMLStreamReader(reader);
reader = buffer.readAsXMLStreamReader();
}
XMLOutputFactory xof = XMLOutputFactory.newInstance();
buffer.writeToXMLStreamWriter(xof.createXMLStreamWriter(System.out));
}
}
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