/*
    * Copyright 2005-2011 the original author or authors.
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *     http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.springframework.ws.client.core;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.net.URI;
  import java.util.List;
  import javax.xml.transform.Result;
  import javax.xml.transform.Source;
  import javax.xml.transform.Transformer;
  import javax.xml.transform.TransformerConfigurationException;
  import javax.xml.transform.TransformerException;
  
  import org.springframework.beans.factory.BeanInitializationException;
  import org.springframework.oxm.Marshaller;
  import org.springframework.oxm.Unmarshaller;
  import org.springframework.util.Assert;
  import org.springframework.util.ObjectUtils;
  import org.springframework.ws.FaultAwareWebServiceMessage;
  import org.springframework.ws.WebServiceMessage;
  import org.springframework.ws.WebServiceMessageFactory;
  import org.springframework.ws.client.WebServiceClientException;
  import org.springframework.ws.client.WebServiceIOException;
  import org.springframework.ws.client.WebServiceTransformerException;
  import org.springframework.ws.client.WebServiceTransportException;
  import org.springframework.ws.client.support.WebServiceAccessor;
  import org.springframework.ws.client.support.destination.DestinationProvider;
  import org.springframework.ws.client.support.interceptor.ClientInterceptor;
  import org.springframework.ws.context.DefaultMessageContext;
  import org.springframework.ws.context.MessageContext;
  import org.springframework.ws.soap.client.core.SoapFaultMessageResolver;
  import org.springframework.ws.support.DefaultStrategiesHelper;
  import org.springframework.ws.support.MarshallingUtils;
  import org.springframework.ws.transport.FaultAwareWebServiceConnection;
  import org.springframework.ws.transport.TransportException;
  import org.springframework.ws.transport.WebServiceConnection;
  import org.springframework.ws.transport.WebServiceMessageSender;
  import org.springframework.ws.transport.context.DefaultTransportContext;
  import org.springframework.ws.transport.context.TransportContext;
  import org.springframework.ws.transport.context.TransportContextHolder;
  import org.springframework.ws.transport.http.HttpUrlConnectionMessageSender;
  import org.springframework.ws.transport.support.TransportUtils;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  /**
   * <strong>The central class for client-side Web services.</strong> It provides a message-driven approach to sending and
   * receiving {@link WebServiceMessage} instances.
   * <p/>
   * Code using this class need only implement callback interfaces, provide {@link Source} objects to read data from, or
   * use the pluggable {@link Marshaller} support. For invoking the {@link #marshalSendAndReceive marshalling methods},
   * the {@link #setMarshaller(Marshaller) marshaller} and {@link #setUnmarshaller(Unmarshaller) unmarshaller} properties
   * must be set.
   * <p/>
   * This template uses a {@link SoapFaultMessageResolver} to handle fault response messages. Another {@link
   * FaultMessageResolver} can be defined with with {@link #setFaultMessageResolver(FaultMessageResolver)
   * faultMessageResolver} property. If this property is set to <code>null</code>, no fault resolving is performed.
   * <p/>
   * This template uses the following algorithm for sending and receiving. <ol> <li>Call {@link #createConnection(URI)
   * createConnection()}.</li> <li>Call {@link WebServiceMessageFactory#createWebServiceMessage()
   * createWebServiceMessage()} on the registered message factory to create a request message.</li> <li>Invoke {@link
   * WebServiceMessageCallback#doWithMessage(WebServiceMessage) doWithMessage()} on the request callback, if any. This
   * step stores content in the request message, based on <code>Source</code>, marshalling, etc.</li> <li>Invoke {@link
   * ClientInterceptor#handleRequest(MessageContext) handleRequest()} on the registered {@link
   * #setInterceptors(ClientInterceptor[]) interceptors}. Interceptors are executed in order. If any of the interceptors
   * creates a response message in the message context, skip to step 7.</li> <li>Call {@link
   * WebServiceConnection#send(WebServiceMessage) send()} on the connection.</li> <li>Call {@link
   * #hasError(WebServiceConnection,WebServiceMessage) hasError()} to check if the connection has an error. For an HTTP
   * transport, a status code other than <code>2xx</code> indicates an error. However, since a status code of 500 can also
   * indicate a SOAP fault, the template verifies whether the error is not a fault.</li> <ul> <li>If the connection has an
   * error, call the {@link #handleError handleError()} method, which by default throws a {@link
   * WebServiceTransportException}.</li> <li>If the connection has no error, continue with the next step.</li> </ul>
   * <li>Invoke {@link WebServiceConnection#receive(WebServiceMessageFactory) receive} on the connection to read the
   * response message, if any.</li> <ul> <li>If no response was received, return <code>null</code> or
   * <code>false</code></li> <li>Call {@link #hasFault(WebServiceConnection,WebServiceMessage) hasFault()} to determine
   * whether the response has a fault. If it has, call {@link ClientInterceptor#handleFault(MessageContext)} and the
   * {@link #handleFault handleFault()} method.</li> <li>Otherwise, invoke {@link ClientInterceptor#handleResponse(MessageContext)}
   * and {@link WebServiceMessageExtractor#extractData(WebServiceMessage) extractData()} on the response extractor, or
   * {@link WebServiceMessageCallback#doWithMessage(WebServiceMessage) doWithMessage} on the response callback.</li> </ul>
   * <li>Call to {@link WebServiceConnection#close() close} on the connection.</li> </ol>
   *
   * @author Arjen Poutsma
   * @since 1.0.0
  */
 public class WebServiceTemplate extends WebServiceAccessor implements WebServiceOperations {
 
     /** Log category to use for message tracing. */
     public static final String MESSAGE_TRACING_LOG_CATEGORY = "org.springframework.ws.client.MessageTracing";
 
     /** Additional logger to use for sent message tracing. */
     protected static final Log sentMessageTracingLogger =
             LogFactory.getLog(WebServiceTemplate.MESSAGE_TRACING_LOG_CATEGORY + ".sent");
 
     /** Additional logger to use for received message tracing. */
     protected static final Log receivedMessageTracingLogger =
             LogFactory.getLog(WebServiceTemplate.MESSAGE_TRACING_LOG_CATEGORY + ".received");
 
     private Marshaller marshaller;
 
     private Unmarshaller unmarshaller;
 
     private FaultMessageResolver faultMessageResolver;
 
     private boolean checkConnectionForError = true;
 
     private boolean checkConnectionForFault = true;
 
     private ClientInterceptor[] interceptors;
 
     private DestinationProvider destinationProvider;
 
     /** Creates a new <code>WebServiceTemplate</code> using default settings. */
     public WebServiceTemplate() {
         initDefaultStrategies();
     }
 
     /**
      * Creates a new <code>WebServiceTemplate</code> based on the given message factory.
      *
      * @param messageFactory the message factory to use
      */
     public WebServiceTemplate(WebServiceMessageFactory messageFactory) {
         setMessageFactory(messageFactory);
         initDefaultStrategies();
     }
 
     /**
      * Creates a new <code>WebServiceTemplate</code> with the given marshaller. If the given {@link
      * Marshaller} also implements the {@link Unmarshaller} interface, it is used for both marshalling and
      * unmarshalling. Otherwise, an exception is thrown.
      * <p/>
      * Note that all {@link Marshaller} implementations in Spring also implement the {@link Unmarshaller} interface,
      * so that you can safely use this constructor.
      *
      * @param marshaller object used as marshaller and unmarshaller
      * @throws IllegalArgumentException when <code>marshaller</code> does not implement the {@link Unmarshaller}
      *                                  interface
      * @since 2.0.3
      */
     public WebServiceTemplate(Marshaller marshaller) {
         Assert.notNull(marshaller, "marshaller must not be null");
         if (!(marshaller instanceof Unmarshaller)) {
             throw new IllegalArgumentException("Marshaller [" + marshaller + "] does not implement the Unmarshaller " +
                     "interface. Please set an Unmarshaller explicitly by using the " +
                     "WebServiceTemplate(Marshaller, Unmarshaller) constructor.");
         }
         else {
             this.setMarshaller(marshaller);
             this.setUnmarshaller((Unmarshaller) marshaller);
         }
 	    initDefaultStrategies();
     }
 
     /**
      * Creates a new <code>MarshallingMethodEndpointAdapter</code> with the given marshaller and unmarshaller.
      *
      * @param marshaller   the marshaller to use
      * @param unmarshaller the unmarshaller to use
      * @since 2.0.3
      */
     public WebServiceTemplate(Marshaller marshaller, Unmarshaller unmarshaller) {
         Assert.notNull(marshaller, "marshaller must not be null");
         Assert.notNull(unmarshaller, "unmarshaller must not be null");
         this.setMarshaller(marshaller);
         this.setUnmarshaller(unmarshaller);
 	    initDefaultStrategies();
     }
 
     /** Returns the default URI to be used on operations that do not have a URI parameter. */
     public String getDefaultUri() {
         if (destinationProvider != null) {
             URI uri = destinationProvider.getDestination();
             return uri != null ? uri.toString() : null;
         }
         else {
             return null;
         }
     }
 
     /**
      * Set the default URI to be used on operations that do not have a URI parameter.
      * <p/>
      * Typically, either this property is set, or {@link #setDestinationProvider(DestinationProvider)}, but not both.
      *
      * @see #marshalSendAndReceive(Object)
      * @see #marshalSendAndReceive(Object,WebServiceMessageCallback)
      * @see #sendSourceAndReceiveToResult(Source,Result)
      * @see #sendSourceAndReceiveToResult(Source,WebServiceMessageCallback,Result)
      * @see #sendSourceAndReceive(Source,SourceExtractor)
      * @see #sendSourceAndReceive(Source,WebServiceMessageCallback,SourceExtractor)
      * @see #sendAndReceive(WebServiceMessageCallback,WebServiceMessageCallback)
      */
     public void setDefaultUri(final String uri) {
         destinationProvider = new DestinationProvider() {
 
             public URI getDestination() {
                 return URI.create(uri);
             }
         };
     }
 
     /** Returns the destination provider used on operations that do not have a URI parameter. */
     public DestinationProvider getDestinationProvider() {
         return destinationProvider;
     }
 
     /**
      * Set the destination provider URI to be used on operations that do not have a URI parameter.
      * <p/>
      * Typically, either this property is set, or {@link #setDefaultUri(String)}, but not both.
      *
      * @see #marshalSendAndReceive(Object)
      * @see #marshalSendAndReceive(Object,WebServiceMessageCallback)
      * @see #sendSourceAndReceiveToResult(Source,Result)
      * @see #sendSourceAndReceiveToResult(Source,WebServiceMessageCallback,Result)
      * @see #sendSourceAndReceive(Source,SourceExtractor)
      * @see #sendSourceAndReceive(Source,WebServiceMessageCallback,SourceExtractor)
      * @see #sendAndReceive(WebServiceMessageCallback,WebServiceMessageCallback)
      */
     public void setDestinationProvider(DestinationProvider destinationProvider) {
         this.destinationProvider = destinationProvider;
     }
 
     /** Returns the marshaller for this template. */
     public Marshaller getMarshaller() {
         return marshaller;
     }
 
     /** Sets the marshaller for this template. */
     public void setMarshaller(Marshaller marshaller) {
         this.marshaller = marshaller;
     }
 
     /** Returns the unmarshaller for this template. */
     public Unmarshaller getUnmarshaller() {
         return unmarshaller;
     }
 
     /** Sets the unmarshaller for this template. */
     public void setUnmarshaller(Unmarshaller unmarshaller) {
         this.unmarshaller = unmarshaller;
     }
 
     /** Returns the fault message resolver for this template. */
     public FaultMessageResolver getFaultMessageResolver() {
         return faultMessageResolver;
     }
 
     /**
      * Sets the fault resolver for this template. Default is the
      * {@link org.springframework.ws.soap.client.core.SoapFaultMessageResolver, SoapFaultMessageResolver}, but may be
      * set to {@code null} to disable fault handling.
      */
     public void setFaultMessageResolver(FaultMessageResolver faultMessageResolver) {
         this.faultMessageResolver = faultMessageResolver;
     }
 
     /**
      * Indicates whether the {@linkplain WebServiceConnection#hasError() connection} should be checked for error
      * indicators (<code>true</code>), or whether these should be ignored (<code>false</code>). The default is
      * <code>true</code>.
      * <p/>
      * When using an HTTP transport, this property defines whether to check the HTTP response status code is in the 2xx
      * Successful range. Both the SOAP specification and the WS-I Basic Profile define that a Web service must return a
      * "200 OK" or "202 Accepted" HTTP status code for a normal response. Setting this property to <code>false</code>
      * allows this template to deal with non-conforming services.
      *
      * @see #hasError(WebServiceConnection, WebServiceMessage)
      * @see <a href="http://www.w3.org/TR/2000/NOTE-SOAP-20000508/#_Toc478383529">SOAP 1.1 specification</a>
      * @see <a href="http://www.ws-i.org/Profiles/BasicProfile-1.1.html#HTTP_Success_Status_Codes">WS-I Basic
      *      Profile</a>
      */
     public void setCheckConnectionForError(boolean checkConnectionForError) {
         this.checkConnectionForError = checkConnectionForError;
     }
 
     /**
      * Indicates whether the {@linkplain FaultAwareWebServiceConnection#hasFault() connection} should be checked for
      * fault indicators (<code>true</code>), or whether we should rely on the {@link
      * FaultAwareWebServiceMessage#hasFault() message} only (<code>false</code>). The default is <code>true</code>.
      * <p/>
      * When using an HTTP transport, this property defines whether to check the HTTP response status code for fault
      * indicators. Both the SOAP specification and the WS-I Basic Profile define that a Web service must return a "500
      * Internal Server Error" HTTP status code if the response envelope is a Fault. Setting this property to
      * <code>false</code> allows this template to deal with non-conforming services.
      *
      * @see #hasFault(WebServiceConnection,WebServiceMessage)
      * @see <a href="http://www.w3.org/TR/2000/NOTE-SOAP-20000508/#_Toc478383529">SOAP 1.1 specification</a>
      * @see <a href="http://www.ws-i.org/Profiles/BasicProfile-1.1.html#HTTP_Server_Error_Status_Codes">WS-I Basic
      *      Profile</a>
      */
     public void setCheckConnectionForFault(boolean checkConnectionForFault) {
         this.checkConnectionForFault = checkConnectionForFault;
     }
 
     /**
      * Returns the client interceptors to apply to all web service invocations made by this template.
      *
      * @return array of endpoint interceptors, or <code>null</code> if none
      */
     public ClientInterceptor[] getInterceptors() {
         return interceptors;
     }
 
     /**
      * Sets the client interceptors to apply to all web service invocations made by this template.
      *
      * @param interceptors array of endpoint interceptors, or <code>null</code> if none
      */
     public final void setInterceptors(ClientInterceptor[] interceptors) {
         this.interceptors = interceptors;
     }
 
     /**
      * Initialize the default implementations for the template's strategies: {@link SoapFaultMessageResolver}, {@link
      * org.springframework.ws.soap.saaj.SaajSoapMessageFactory}, and {@link HttpUrlConnectionMessageSender}.
      *
      * @throws BeanInitializationException in case of initalization errors
      * @see #setFaultMessageResolver(FaultMessageResolver)
      * @see #setMessageFactory(WebServiceMessageFactory)
      * @see #setMessageSender(WebServiceMessageSender)
      */
     protected void initDefaultStrategies() {
         DefaultStrategiesHelper strategiesHelper = new DefaultStrategiesHelper(WebServiceTemplate.class);
         if (getMessageFactory() == null) {
             initMessageFactory(strategiesHelper);
         }
         if (ObjectUtils.isEmpty(getMessageSenders())) {
             initMessageSenders(strategiesHelper);
         }
         if (getFaultMessageResolver() == null) {
             initFaultMessageResolver(strategiesHelper);
         }
     }
 
     private void initMessageFactory(DefaultStrategiesHelper helper) throws BeanInitializationException {
         WebServiceMessageFactory messageFactory = helper.getDefaultStrategy(WebServiceMessageFactory.class);
         setMessageFactory(messageFactory);
     }
 
     private void initMessageSenders(DefaultStrategiesHelper helper) {
         List<WebServiceMessageSender> messageSenders = helper.getDefaultStrategies(WebServiceMessageSender.class);
         setMessageSenders(messageSenders.toArray(new WebServiceMessageSender[messageSenders.size()]));
     }
 
     private void initFaultMessageResolver(DefaultStrategiesHelper helper) throws BeanInitializationException {
         FaultMessageResolver faultMessageResolver = helper.getDefaultStrategy(FaultMessageResolver.class);
         setFaultMessageResolver(faultMessageResolver);
     }
 
     //
     // Marshalling methods
     //
 
     public Object marshalSendAndReceive(final Object requestPayload) {
         return marshalSendAndReceive(requestPayload, null);
     }
 
     public Object marshalSendAndReceive(String uri, final Object requestPayload) {
         return marshalSendAndReceive(uri, requestPayload, null);
     }
 
     public Object marshalSendAndReceive(final Object requestPayload, final WebServiceMessageCallback requestCallback) {
         return marshalSendAndReceive(getDefaultUri(), requestPayload, requestCallback);
     }
 
     public Object marshalSendAndReceive(String uri,
                                         final Object requestPayload,
                                         final WebServiceMessageCallback requestCallback) {
         return sendAndReceive(uri, new WebServiceMessageCallback() {
 
             public void doWithMessage(WebServiceMessage request) throws IOException, TransformerException {
                 if (requestPayload != null) {
                     Marshaller marshaller = getMarshaller();
                     if (marshaller == null) {
                         throw new IllegalStateException(
                                 "No marshaller registered. Check configuration of WebServiceTemplate.");
                     }
                     MarshallingUtils.marshal(marshaller, requestPayload, request);
                     if (requestCallback != null) {
                         requestCallback.doWithMessage(request);
                     }
                 }
             }
         }, new WebServiceMessageExtractor<Object>() {
 
             public Object extractData(WebServiceMessage response) throws IOException {
                 Unmarshaller unmarshaller = getUnmarshaller();
                 if (unmarshaller == null) {
                     throw new IllegalStateException(
                             "No unmarshaller registered. Check configuration of WebServiceTemplate.");
                 }
                 return MarshallingUtils.unmarshal(unmarshaller, response);
             }
         });
     }
 
     //
     // Result-handling methods
     //
 
     public boolean sendSourceAndReceiveToResult(Source requestPayload, Result responseResult) {
         return sendSourceAndReceiveToResult(requestPayload, null, responseResult);
     }
 
     public boolean sendSourceAndReceiveToResult(String uri, Source requestPayload, Result responseResult) {
         return sendSourceAndReceiveToResult(uri, requestPayload, null, responseResult);
     }
 
     public boolean sendSourceAndReceiveToResult(Source requestPayload,
                                                 WebServiceMessageCallback requestCallback,
                                                 final Result responseResult) {
         return sendSourceAndReceiveToResult(getDefaultUri(), requestPayload, requestCallback, responseResult);
     }
 
     public boolean sendSourceAndReceiveToResult(String uri,
                                                 Source requestPayload,
                                                 WebServiceMessageCallback requestCallback,
                                                 final Result responseResult) {
         try {
             final Transformer transformer = createTransformer();
             Boolean retVal = doSendAndReceive(uri, transformer, requestPayload, requestCallback,
                     new SourceExtractor<Boolean>() {
 
                         public Boolean extractData(Source source) throws IOException, TransformerException {
                             if (source != null) {
                                 transformer.transform(source, responseResult);
                             }
                             return Boolean.TRUE;
                         }
                     });
             return retVal != null && retVal;
         }
         catch (TransformerConfigurationException ex) {
             throw new WebServiceTransformerException("Could not create transformer", ex);
         }
     }
 
     //
     // Source-handling methods
     //
 
     public <T> T sendSourceAndReceive(final Source requestPayload, final SourceExtractor<T> responseExtractor) {
         return sendSourceAndReceive(requestPayload, null, responseExtractor);
     }
 
     public <T> T sendSourceAndReceive(String uri,
                                        final Source requestPayload,
                                        final SourceExtractor<T> responseExtractor) {
         return sendSourceAndReceive(uri, requestPayload, null, responseExtractor);
     }
 
     public <T> T sendSourceAndReceive(final Source requestPayload,
                                        final WebServiceMessageCallback requestCallback,
                                        final SourceExtractor<T> responseExtractor) {
         return sendSourceAndReceive(getDefaultUri(), requestPayload, requestCallback, responseExtractor);
     }
 
     public <T> T sendSourceAndReceive(String uri,
                                        final Source requestPayload,
                                        final WebServiceMessageCallback requestCallback,
                                        final SourceExtractor<T> responseExtractor) {
 
         try {
             return doSendAndReceive(uri, createTransformer(), requestPayload, requestCallback, responseExtractor);
         }
         catch (TransformerConfigurationException ex) {
             throw new WebServiceTransformerException("Could not create transformer", ex);
         }
     }
 
     private <T> T doSendAndReceive(String uri,
                                     final Transformer transformer,
                                     final Source requestPayload,
                                     final WebServiceMessageCallback requestCallback,
                                     final SourceExtractor<T> responseExtractor) {
         Assert.notNull(responseExtractor, "responseExtractor must not be null");
         return sendAndReceive(uri, new WebServiceMessageCallback() {
             public void doWithMessage(WebServiceMessage message) throws IOException, TransformerException {
                 transformer.transform(requestPayload, message.getPayloadResult());
                 if (requestCallback != null) {
                     requestCallback.doWithMessage(message);
                 }
             }
         }, new SourceExtractorMessageExtractor<T>(responseExtractor));
     }
 
     //
     // WebServiceMessage-handling methods
     //
 
     public boolean sendAndReceive(WebServiceMessageCallback requestCallback,
                                   WebServiceMessageCallback responseCallback) {
         return sendAndReceive(getDefaultUri(), requestCallback, responseCallback);
     }
 
     public boolean sendAndReceive(String uri,
                                   WebServiceMessageCallback requestCallback,
                                   WebServiceMessageCallback responseCallback) {
         Assert.notNull(responseCallback, "responseCallback must not be null");
         Boolean result = sendAndReceive(uri, requestCallback,
                 new WebServiceMessageCallbackMessageExtractor(responseCallback));
         return result != null && result;
     }
 
     public <T> T sendAndReceive(WebServiceMessageCallback requestCallback,
                                  WebServiceMessageExtractor<T> responseExtractor) {
         return sendAndReceive(getDefaultUri(), requestCallback, responseExtractor);
     }
 
     public <T> T sendAndReceive(String uriString,
                                  WebServiceMessageCallback requestCallback,
                                  WebServiceMessageExtractor<T> responseExtractor) {
         Assert.notNull(responseExtractor, "'responseExtractor' must not be null");
         Assert.hasLength(uriString, "'uri' must not be empty");
         TransportContext previousTransportContext = TransportContextHolder.getTransportContext();
         WebServiceConnection connection = null;
         try {
             connection = createConnection(URI.create(uriString));
             TransportContextHolder.setTransportContext(new DefaultTransportContext(connection));
             MessageContext messageContext = new DefaultMessageContext(getMessageFactory());
 
             return doSendAndReceive(messageContext, connection, requestCallback, responseExtractor);
         }
         catch (TransportException ex) {
             throw new WebServiceTransportException("Could not use transport: " + ex.getMessage(), ex);
         }
         catch (IOException ex) {
             throw new WebServiceIOException("I/O error: " + ex.getMessage(), ex);
         }
         finally {
             TransportUtils.closeConnection(connection);
             TransportContextHolder.setTransportContext(previousTransportContext);
         }
     }
 
     /**
      * Sends and receives a {@link MessageContext}. Sends the {@link MessageContext#getRequest() request message}, and
      * received to the {@link MessageContext#getResponse() repsonse message}. Invocates the defined {@link
      * #setInterceptors(ClientInterceptor[]) interceptors} as part of the process.
      *
      * @param messageContext    the message context
      * @param connection        the connection to use
      * @param requestCallback   the requestCallback to be used for manipulating the request message
      * @param responseExtractor object that will extract results
      * @return an arbitrary result object, as returned by the <code>WebServiceMessageExtractor</code>
      * @throws WebServiceClientException if there is a problem sending or receiving the message
      * @throws IOException               in case of I/O errors
      */
     @SuppressWarnings("unchecked")
     protected <T> T doSendAndReceive(MessageContext messageContext,
                                      WebServiceConnection connection,
                                      WebServiceMessageCallback requestCallback,
                                      WebServiceMessageExtractor<T> responseExtractor) throws IOException {
         try {
             if (requestCallback != null) {
                 requestCallback.doWithMessage(messageContext.getRequest());
             }
             // Apply handleRequest of registered interceptors
             int interceptorIndex = -1;
             if (interceptors != null) {
                 for (int i = 0; i < interceptors.length; i++) {
                     interceptorIndex = i;
                     if (!interceptors[i].handleRequest(messageContext)) {
                         break;
                     }
                 }
             }
             // if an interceptor has set a response, we don't send/receive
             if (!messageContext.hasResponse()) {
                 sendRequest(connection, messageContext.getRequest());
                 if (hasError(connection, messageContext.getRequest())) {
                     return (T)handleError(connection, messageContext.getRequest());
                 }
                 WebServiceMessage response = connection.receive(getMessageFactory());
                 messageContext.setResponse(response);
             }
             logResponse(messageContext);
             if (messageContext.hasResponse()) {
                 if (!hasFault(connection, messageContext.getResponse())) {
                     triggerHandleResponse(interceptorIndex, messageContext);
                     return responseExtractor.extractData(messageContext.getResponse());
                 }
                 else {
                     triggerHandleFault(interceptorIndex, messageContext);
                     return (T)handleFault(connection, messageContext);
                 }
             }
             else {
                 return null;
             }
         }
         catch (TransformerException ex) {
             throw new WebServiceTransformerException("Transformation error: " + ex.getMessage(), ex);
         }
     }
 
     /** Sends the request in the given message context over the connection. */
     private void sendRequest(WebServiceConnection connection, WebServiceMessage request) throws IOException {
         if (sentMessageTracingLogger.isTraceEnabled()) {
             ByteArrayOutputStream os = new ByteArrayOutputStream();
             request.writeTo(os);
             sentMessageTracingLogger.trace("Sent request [" + os.toString("UTF-8") + "]");
         }
         else if (sentMessageTracingLogger.isDebugEnabled()) {
             sentMessageTracingLogger.debug("Sent request [" + request + "]");
         }
         connection.send(request);
     }
 
     /**
      * Determines whether the given connection or message context has an error.
      * <p/>
      * This implementation checks the {@link WebServiceConnection#hasError() connection} first. If it indicates an
      * error, it makes sure that it is not a {@link FaultAwareWebServiceConnection#hasFault() fault}.
      *
      * @param connection the connection (possibly a {@link FaultAwareWebServiceConnection}
      * @param request    the response message (possibly a {@link FaultAwareWebServiceMessage}
      * @return <code>true</code> if the connection has an error; <code>false</code> otherwise
      * @throws IOException in case of I/O errors
      */
     protected boolean hasError(WebServiceConnection connection, WebServiceMessage request) throws IOException {
         if (checkConnectionForError && connection.hasError()) {
             // could be a fault
             if (checkConnectionForFault && connection instanceof FaultAwareWebServiceConnection) {
                 FaultAwareWebServiceConnection faultConnection = (FaultAwareWebServiceConnection) connection;
                 return !(faultConnection.hasFault() && request instanceof FaultAwareWebServiceMessage);
             }
             else {
                 return true;
             }
         }
         return false;
     }
 
     /**
      * Handles an error on the given connection. The default implementation throws a {@link
      * WebServiceTransportException}.
      *
      * @param connection the erroneous connection
      * @param request    the corresponding request message
      * @return the object to be returned from {@link #sendAndReceive(String,WebServiceMessageCallback,
      *         WebServiceMessageExtractor)}, if any
      */
     protected Object handleError(WebServiceConnection connection, WebServiceMessage request) throws IOException {
         if (logger.isDebugEnabled()) {
             logger.debug("Received error for request [" + request + "]");
         }
         throw new WebServiceTransportException(connection.getErrorMessage());
     }
 
     private void logResponse(MessageContext messageContext) throws IOException {
         if (messageContext.hasResponse()) {
             if (receivedMessageTracingLogger.isTraceEnabled()) {
                 ByteArrayOutputStream requestStream = new ByteArrayOutputStream();
                 messageContext.getRequest().writeTo(requestStream);
                 ByteArrayOutputStream responseStream = new ByteArrayOutputStream();
                 messageContext.getResponse().writeTo(responseStream);
                 receivedMessageTracingLogger
                         .trace("Received response [" + responseStream.toString("UTF-8") + "] for request [" +
                                 requestStream.toString("UTF-8") + "]");
             }
             else if (receivedMessageTracingLogger.isDebugEnabled()) {
                 receivedMessageTracingLogger
                         .debug("Received response [" + messageContext.getResponse() + "] for request [" +
                                 messageContext.getRequest() + "]");
             }
         }
         else {
             if (logger.isDebugEnabled()) {
                 receivedMessageTracingLogger
                         .debug("Received no response for request [" + messageContext.getRequest() + "]");
             }
         }
     }
 
     /**
      * Determines whether the given connection or message has a fault.
      * <p/>
      * This implementation checks the {@link FaultAwareWebServiceConnection#hasFault() connection} if the {@link
      * #setCheckConnectionForFault(boolean) checkConnectionForFault} property is true, and defaults to the {@link
      * FaultAwareWebServiceMessage#hasFault() message} otherwise.
      *
      * @param connection the connection (possibly a {@link FaultAwareWebServiceConnection}
      * @param response   the response message (possibly a {@link FaultAwareWebServiceMessage}
      * @return <code>true</code> if either the connection or the message has a fault; <code>false</code> otherwise
      * @throws IOException in case of I/O errors
      */
     protected boolean hasFault(WebServiceConnection connection, WebServiceMessage response) throws IOException {
         if (checkConnectionForFault && connection instanceof FaultAwareWebServiceConnection) {
             // check whether the connection has a fault (i.e. status code 500 in HTTP)
             FaultAwareWebServiceConnection faultConnection = (FaultAwareWebServiceConnection) connection;
             if (!faultConnection.hasFault()) {
                 return false;
             }
         }
         if (response instanceof FaultAwareWebServiceMessage) {
             // either the connection has a fault, or checkConnectionForFault is false: let's verify the fault
             FaultAwareWebServiceMessage faultMessage = (FaultAwareWebServiceMessage) response;
             return faultMessage.hasFault();
         }
         return false;
     }
 
     /**
      * Trigger handleResponse on the defined ClientInterceptors. Will just invoke said method on all interceptors whose
      * handleRequest invocation returned <code>true</code>, in addition to the last interceptor who returned
      * <code>false</code>.
      *
      * @param interceptorIndex index of last interceptor that was called
      * @param messageContext   the message context, whose request and response are filled
      * @see ClientInterceptor#handleResponse(MessageContext)
      * @see ClientInterceptor#handleFault(MessageContext)
      */
     private void triggerHandleResponse(int interceptorIndex, MessageContext messageContext) {
         if (messageContext.hasResponse() && interceptors != null) {
             for (int i = interceptorIndex; i >= 0; i--) {
                 if (!interceptors[i].handleResponse(messageContext)) {
                     break;
                 }
             }
         }
     }
 
     /**
      * Trigger handleFault on the defined ClientInterceptors. Will just invoke said method on all interceptors whose
      * handleRequest invocation returned <code>true</code>, in addition to the last interceptor who returned
      * <code>false</code>.
      *
      * @param interceptorIndex index of last interceptor that was called
      * @param messageContext   the message context, whose request and response are filled
      * @see ClientInterceptor#handleResponse(MessageContext)
      * @see ClientInterceptor#handleFault(MessageContext)
      */
     private void triggerHandleFault(int interceptorIndex, MessageContext messageContext) {
         if (messageContext.hasResponse() && interceptors != null) {
             for (int i = interceptorIndex; i >= 0; i--) {
                 if (!interceptors[i].handleFault(messageContext)) {
                     break;
                 }
             }
         }
     }
 
     /**
      * Handles an fault in the given response message. The default implementation invokes the {@link
      * FaultMessageResolver fault resolver} if registered, or invokes {@link #handleError(WebServiceConnection,
      * WebServiceMessage)} otherwise.
      *
      * @param connection     the faulty connection
      * @param messageContext the message context
      * @return the object to be returned from {@link #sendAndReceive(String,WebServiceMessageCallback,
      *         WebServiceMessageExtractor)}, if any
      */
     protected Object handleFault(WebServiceConnection connection, MessageContext messageContext) throws IOException {
         if (logger.isDebugEnabled()) {
             logger.debug("Received Fault message for request [" + messageContext.getRequest() + "]");
         }
         if (getFaultMessageResolver() != null) {
             getFaultMessageResolver().resolveFault(messageContext.getResponse());
             return null;
         }
         else {
             return handleError(connection, messageContext.getRequest());
         }
     }
 
     /** Adapter to enable use of a WebServiceMessageCallback inside a WebServiceMessageExtractor. */
     private static class WebServiceMessageCallbackMessageExtractor implements WebServiceMessageExtractor<Boolean> {
 
         private final WebServiceMessageCallback callback;
 
         private WebServiceMessageCallbackMessageExtractor(WebServiceMessageCallback callback) {
             this.callback = callback;
         }
 
         public Boolean extractData(WebServiceMessage message) throws IOException, TransformerException {
             callback.doWithMessage(message);
             return Boolean.TRUE;
         }
     }
 
     /** Adapter to enable use of a SourceExtractor inside a WebServiceMessageExtractor. */
     private static class SourceExtractorMessageExtractor<T> implements WebServiceMessageExtractor<T> {
 
         private final SourceExtractor<T> sourceExtractor;
 
         private SourceExtractorMessageExtractor(SourceExtractor<T> sourceExtractor) {
             this.sourceExtractor = sourceExtractor;
         }
 
         public T extractData(WebServiceMessage message) throws IOException, TransformerException {
             return sourceExtractor.extractData(message.getPayloadSource());
         }
     }
 
 }