Package org.zkoss.zk.au.http

Class HttpAuWriter

java.lang.Object

org.zkoss.zk.au.http.HttpAuWriter

All Implemented Interfaces:

AuWriter

public class HttpAuWriter
extends Object
implements AuWriter

The writer used to write the output back to the client.

Since:

3.0.1

Author:

tomyeh

Constructor Summary

Constructors

Constructor	Description
HttpAuWriter()

Method Summary

Modifier and Type	Method	Description
void	close(Object request, Object response)	Closes the writer and flush the result to client.
Object	complete()	Indicates the writing has been completed.
protected void	flush(Object request, Object response, boolean bCompress)	Flush the result of responses to client.
boolean	isCompress()	Returns whether to compress the output.
AuWriter	open(Object request, Object response)	Opens the connection.
void	resend(Object prevContent)	Resend the content of the previous request returned by AuWriter.complete().
protected byte[]	restore(Object data)	Called to decode the last response for repeated request before retrieving.
protected Object	save(byte[] data)	Called to encode the last response for repeated request before storing.
void	setCompress(boolean compress)	Sets whether to compress the output with GZIP.
void	write(Collection<AuResponse> responses)	Generates a list of responses to the output.
void	write(AuResponse response)	Generates the specified the response to the output.
void	writeResponseId(int resId)	Generates the response ID to the output.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

HttpAuWriter

public HttpAuWriter()

Method Details

isCompress

public boolean isCompress()

Returns whether to compress the output.

Since:

3.6.3

setCompress

public void setCompress(boolean compress)

Description copied from interface: AuWriter

Sets whether to compress the output with GZIP.

Default: true.

Specified by:

setCompress in interface AuWriter

open

public AuWriter open(Object request,
 Object response)
              throws IOException

Opens the connection.

Default: it creates an object to store the responses.

Specified by:

open in interface AuWriter

Parameters:

request - the request (HttpServletRequest if HTTP)

response - the response (HttpServletResponse if HTTP)

Returns:

this object

Throws:

IOException

close

public void close(Object request,
 Object response)
           throws IOException

Description copied from interface: AuWriter

Closes the writer and flush the result to client.

Specified by:

close in interface AuWriter

Parameters:

request - the request (HttpServletRequest if HTTP)

response - the response (HttpServletResponse if HTTP)

Throws:

IOException

resend

public void resend(Object prevContent)
            throws IOException

Description copied from interface: AuWriter

Resend the content of the previous request returned by AuWriter.complete().

The content is usually stored to a desktop by DesktopCtrl.responseSent(java.lang.String, java.lang.Object), and retrieved by DesktopCtrl.getLastResponse(java.lang.String).

Once this method is called, the caller shall not invoke any other write method nor AuWriter.complete(). It shall invoke only AuWriter.close(java.lang.Object, java.lang.Object) to end the writer.

Specified by:

resend in interface AuWriter

Parameters:

prevContent - the previous content returned by AuWriter.close(java.lang.Object, java.lang.Object) of the previous AuWriter.

Throws:

IOException

complete

public Object complete()
                throws IOException

Description copied from interface: AuWriter

Indicates the writing has been completed. Invokes this method before AuWriter.close(java.lang.Object, java.lang.Object), if the caller supports the resend mechanism. The caller usually stores the return value to a desktop by DesktopCtrl.responseSent(java.lang.String, java.lang.Object)).

Unlike AuWriter.close(java.lang.Object, java.lang.Object), this method must be called in an activated execution.

Once this method is called, the caller shall not invoke any other write method. It shall invoke only AuWriter.close(java.lang.Object, java.lang.Object) to end the writer.

Specified by:

complete in interface AuWriter

Throws:

IOException

flush

protected void flush(Object request,
 Object response,
 boolean bCompress)
              throws IOException

Flush the result of responses to client.

Parameters:

bCompress - whether to compress (if allowed).

Throws:

IOException

Since:

5.0.4

save

protected Object save(byte[] data)

Called to encode the last response for repeated request before storing.

Default: does nothing but return the input argument, data. The derived class might override this method to compress it.

Since:

5.0.4

See Also:

• restore(java.lang.Object)

restore

protected byte[] restore(Object data)

Called to decode the last response for repeated request before retrieving.

Default: does nothing but return the input argument, data. The derived class might override this method to uncompress it.

Parameters:

data - the data returned by save(byte[])

Returns:

the byte array that is passed to save(byte[]).

Since:

5.0.4

writeResponseId

public void writeResponseId(int resId)
                     throws IOException

Description copied from interface: AuWriter

Generates the response ID to the output.

Specified by:

writeResponseId in interface AuWriter

Throws:

IOException

See Also:

• DesktopCtrl.getResponseId(boolean)

write

public void write(AuResponse response)
           throws IOException

Description copied from interface: AuWriter

Generates the specified the response to the output.

Specified by:

write in interface AuWriter

Throws:

IOException

write

public void write(Collection<AuResponse> responses)
           throws IOException

Description copied from interface: AuWriter

Generates a list of responses to the output.

Specified by:

write in interface AuWriter

Throws:

IOException