Examples of org.vfny.geoserver.Response

org.vfny.geoserver.Response
The Response interface serves as a common denominator for all service operations that generates content.
The work flow for this kind of objects is divided in two parts: the first is executing a request and the second writing the result to an OuputStream.
1. Execute: execute(Request)
  - Executing the request means taking a Request object and, based on it's set of request parameters, do any heavy processing necessary to produce the response.
  - Once the execution has been made, the Response object should be ready to send the response content to an output stream with minimal risk of generating an exception.
  - Anyway, it is not required, even recomended, that the execution process generates the response content itself; just that it performs any query or processing that should generate a trapable error.
  - Execute may throw a ServiceException if they wish to supply a specific response in error. As an example the WFSTransaction process has a defined Transaction Document with provisions for reporting error information.
2. ContentType: getContentType()
  - Called to set the response type. Depending on the stratagy used by AbstractService the framework may be commited to returning this type.
3. Writing: writeTo(OutputStream)
  - Write the response to the provided output stream.
  - Any exceptions thrown by this writeTo method may never reach the end user in useable form. You should assume you are writing directly to the client.
Note: abort() will be called as part of error handling giving your response subclass a chance to clean up any temporary resources it may have required in execute() for use in writeTo().

This is specially usefull for streamed responses such as wfs GetFeature or WMS GetMap, where the execution process can be used to parse parameters, execute queries upon the corresponding data sources and leave things ready to generate a streamed response when the consumer calls writeTo.

@author Gabriel Rold?n @version $Id: Response.java 11475 2009-02-28 18:41:23Z jdeolive $

    }


    public String getMimeType(Object value, Operation operation)
        throws ServiceException {
        //get the delegate
        Response delegate = (Response) value;


        //get the requst object from the operation
        Request request = (Request) OwsUtils.parameter(operation.getParameters(), Request.class);


        //the old contract specifies that execute must be called before 
        // get content type
        delegate.execute(request);


        //return the content type
        return delegate.getContentType(gs);
    }

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    }


    public void write(Object value, OutputStream output, Operation operation)
        throws IOException, ServiceException {
        //get the delegate
        Response delegate = (Response) value;


        //write the response
        delegate.writeTo(output);
    }

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        //write the response
        delegate.writeTo(output);
    }
    
    public String[][] getHeaders(Object value, Operation operation) throws ServiceException {
        Response delegate = (Response) value;
        HashMap map = new HashMap();
        if ( delegate.getContentDisposition() != null ) {
            map.put( "Content-Disposition", delegate.getContentDisposition() );
        }
        
        HashMap m = delegate.getResponseHeaders();
        if ( m != null && !m.isEmpty() ) {
            map.putAll( m );
        }
        
        if(map == null || map.isEmpty())

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    }


    public String getMimeType(Object value, Operation operation)
        throws ServiceException {
        //get the delegate
        Response delegate = (Response) value;


        //get the requst object from the operation
        Request request = (Request) OwsUtils.parameter(operation.getParameters(), Request.class);


        //the old contract specifies that execute must be called before 
        // get content type
        delegate.execute(request);


        //return the content type
        return delegate.getContentType(gs);
    }

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    }


    public void write(Object value, OutputStream output, Operation operation)
        throws IOException, ServiceException {
        //get the delegate
        Response delegate = (Response) value;


        //write the response
        delegate.writeTo(output);
    }

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        //write the response
        delegate.writeTo(output);
    }
    
    public String[][] getHeaders(Object value, Operation operation) throws ServiceException {
        Response delegate = (Response) value;
        HashMap map = new HashMap();
        if ( delegate.getContentDisposition() != null ) {
            map.put( "Content-Disposition", delegate.getContentDisposition() );
        }
        
        HashMap m = delegate.getResponseHeaders();
        if ( m != null && !m.isEmpty() ) {
            map.putAll( m );
        }
        
        if(map == null || map.isEmpty())

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            return;
        }


        ServiceStrategy strategy = null;
        Response serviceResponse = null;


        try {
            strategy = getServiceStrategy();
            LOGGER.fine("strategy is: " + strategy);
            serviceResponse = getResponseHandler();
        } catch (Throwable t) {
            sendError(response, t);


            return;
        }


        Service s = null;


        if ("WFS".equals(serviceRequest.getService())) {
            s = serviceRequest.getWFS();
        } else {
            s = serviceRequest.getWMS();
        }


        try {
            // execute request
            LOGGER.finer("executing request");
            serviceResponse.execute(serviceRequest);
            LOGGER.finer("execution succeed");
        } catch (ServiceException serviceException) {
            LOGGER.warning("service exception while executing request: "
                + serviceRequest + "\ncause: " + serviceException.getMessage());
            serviceResponse.abort(s);
            sendError(response, serviceException);


            return;
        } catch (Throwable t) {
            //we can safelly send errors here, since we have not touched response yet
            serviceResponse.abort(s);
            sendError(response, t);


            return;
        }


        OutputStream strategyOuput = null;


        //obtain the strategy output stream
        try {
            LOGGER.finest("getting strategy output");
            strategyOuput = strategy.getDestination(response);
            LOGGER.finer("strategy output is: "
                + strategyOuput.getClass().getName());


            String mimeType = serviceResponse.getContentType(s.getGeoServer());
            LOGGER.fine("mime type is: " + mimeType);
            response.setContentType(mimeType);


            String encoding = serviceResponse.getContentEncoding();


            if (encoding != null) {
                LOGGER.fine("content encoding is: " + encoding);
                response.setHeader("content-encoding", encoding);
            }
        } catch (SocketException socketException) {
            LOGGER.fine(
                "it seems that the user has closed the request stream: "
                + socketException.getMessage());


            // It seems the user has closed the request stream
            // Apparently this is a "cancel" and will quietly go away
            //
            // I will still give strategy and serviceResponse
            // a chance to clean up
            //
            serviceResponse.abort(s);
            strategy.abort();


            return;
        } catch (IOException ex) {
            serviceResponse.abort(s);
            strategy.abort();
            sendError(response, ex);


            return;
        }


        try {
            // gather response
            serviceResponse.writeTo(strategyOuput);
            strategyOuput.flush();
            strategy.flush();
        } catch (java.net.SocketException sockEx) { // user cancel
            serviceResponse.abort(s);
            strategy.abort();


            return;
        } catch (IOException ioException) { // strategyOutput error
            serviceResponse.abort(s);
            strategy.abort();
            sendError(response, ioException);


            return;
        } catch (ServiceException writeToFailure) { // writeTo Failure
            serviceResponse.abort(s);
            strategy.abort();
            sendError(response, writeToFailure);


            return;
        } catch (Throwable help) { // This is an unexpected error(!)
          help.printStackTrace();
            serviceResponse.abort(s);
            strategy.abort();
            sendError(response, help);


            return;
        }

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    }


    public String getMimeType(Object value, Operation operation)
        throws ServiceException {
        //get the delegate
        Response delegate = (Response) value;


        //get the requst object from the operation
        Request request = (Request) OwsUtils.parameter(operation.getParameters(), Request.class);


        //the old contract specifies that execute must be called before 
        // get content type
        delegate.execute(request);


        //return the content type
        return delegate.getContentType(gs);
    }

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    }


    public void write(Object value, OutputStream output, Operation operation)
        throws IOException, ServiceException {
        //get the delegate
        Response delegate = (Response) value;


        //write the response
        delegate.writeTo(output);
    }

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        //write the response
        delegate.writeTo(output);
    }
    
    public String[][] getHeaders(Object value, Operation operation) throws ServiceException {
        Response delegate = (Response) value;
        HashMap map = new HashMap();
        if ( delegate.getContentDisposition() != null ) {
            map.put( "Content-Disposition", delegate.getContentDisposition() );
        }
        
        HashMap m = delegate.getResponseHeaders();
        if ( m != null && !m.isEmpty() ) {
            map.putAll( m );
        }
        
        if(map == null || map.isEmpty())

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Related Classes of org.vfny.geoserver.Response

org.geoserver.ows.adapters.ResponseAdapter

org.vfny.geoserver.servlets.AbstractService

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