javax.servlet

Class ServletResponseWrapper

java.lang.Object

javax.servlet.ServletResponseWrapper

All Implemented Interfaces:

ServletResponse

Direct Known Subclasses:

HttpServletResponseWrapper

public class ServletResponseWrapper
extends Object
implements ServletResponse

Provides a convenient implementation of the ServletResponse interface that can be subclassed by developers wishing to adapt the response from a Servlet. This class implements the Wrapper or Decorator pattern. Methods default to calling through to the wrapped response object.

Since:

Servlet 2.3

Author:

Various

See Also:

ServletResponse

Constructor Summary

Constructors

Constructor and Description
ServletResponseWrapper(ServletResponse response) Creates a ServletResponse adaptor wrapping the given response object.

Method Summary

Modifier and Type	Method and Description
void	flushBuffer() The default behavior of this method is to call flushBuffer() on the wrapped response object.
int	getBufferSize() The default behavior of this method is to return getBufferSize() on the wrapped response object.
String	getCharacterEncoding() The default behavior of this method is to return getCharacterEncoding() on the wrapped response object.
String	getContentType() The default behavior of this method is to return getContentType() on the wrapped response object.
Locale	getLocale() The default behavior of this method is to return getLocale() on the wrapped response object.
ServletOutputStream	getOutputStream() The default behavior of this method is to return getOutputStream() on the wrapped response object.
ServletResponse	getResponse() Return the wrapped ServletResponse object.
PrintWriter	getWriter() The default behavior of this method is to return getWriter() on the wrapped response object.
boolean	isCommitted() The default behavior of this method is to return isCommitted() on the wrapped response object.
boolean	isWrapperFor(Class<?> wrappedType) Checks (recursively) if this ServletResponseWrapper wraps a ServletResponse of the given class type.
boolean	isWrapperFor(ServletResponse wrapped) Checks (recursively) if this ServletResponseWrapper wraps the given ServletResponse instance.
void	reset() The default behavior of this method is to call reset() on the wrapped response object.
void	resetBuffer() The default behavior of this method is to call resetBuffer() on the wrapped response object.
void	setBufferSize(int size) The default behavior of this method is to call setBufferSize(int size) on the wrapped response object.
void	setCharacterEncoding(String charset) The default behavior of this method is to call setCharacterEncoding(String charset) on the wrapped response object.
void	setContentLength(int len) The default behavior of this method is to call setContentLength(int len) on the wrapped response object.
void	setContentLengthLong(long len) The default behavior of this method is to call setContentLengthLong(long len) on the wrapped response object.
void	setContentType(String type) The default behavior of this method is to call setContentType(String type) on the wrapped response object.
void	setLocale(Locale loc) The default behavior of this method is to call setLocale(Locale loc) on the wrapped response object.
void	setResponse(ServletResponse response) Sets the response being wrapped.

Methods inherited from class java.lang.Object

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

Constructor Detail

ServletResponseWrapper

public ServletResponseWrapper(ServletResponse response)

Creates a ServletResponse adaptor wrapping the given response object.

Parameters:

response - the ServletResponse to be wrapped

Throws:

IllegalArgumentException - if the response is null.

Method Detail

getResponse

public ServletResponse getResponse()

Return the wrapped ServletResponse object.

Returns:

the wrapped ServletResponse

setResponse

public void setResponse(ServletResponse response)

Sets the response being wrapped.

Parameters:

response - the ServletResponse to be installed

Throws:

IllegalArgumentException - if the response is null.

setCharacterEncoding

public void setCharacterEncoding(String charset)

The default behavior of this method is to call setCharacterEncoding(String charset) on the wrapped response object.

Specified by:

setCharacterEncoding in interface ServletResponse

Parameters:

charset - a String specifying only the character set defined by IANA Character Sets (http://www.iana.org/assignments/character-sets)

Since:

Servlet 2.4

See Also:

ServletResponse.setContentType(java.lang.String), ServletResponse.setLocale(java.util.Locale)

getCharacterEncoding

public String getCharacterEncoding()

The default behavior of this method is to return getCharacterEncoding() on the wrapped response object.

Specified by:

getCharacterEncoding in interface ServletResponse

Returns:

a String specifying the name of the character encoding, for example, UTF-8

getOutputStream

public ServletOutputStream getOutputStream()
                                    throws IOException

The default behavior of this method is to return getOutputStream() on the wrapped response object.

Specified by:

getOutputStream in interface ServletResponse

Returns:

a ServletOutputStream for writing binary data

Throws:

IOException - if an input or output exception occurred

See Also:

ServletResponse.getWriter(), ServletResponse.reset()

getWriter

public PrintWriter getWriter()
                      throws IOException

The default behavior of this method is to return getWriter() on the wrapped response object.

Specified by:

getWriter in interface ServletResponse

Returns:

a PrintWriter object that can return character data to the client

Throws:

UnsupportedEncodingException - if the character encoding returned by getCharacterEncoding cannot be used

IOException - if an input or output exception occurred

See Also:

ServletResponse.getOutputStream(), ServletResponse.setCharacterEncoding(java.lang.String), ServletResponse.reset()

setContentLength

public void setContentLength(int len)

The default behavior of this method is to call setContentLength(int len) on the wrapped response object.

Specified by:

setContentLength in interface ServletResponse

Parameters:

len - an integer specifying the length of the content being returned to the client; sets the Content-Length header

setContentLengthLong

public void setContentLengthLong(long len)

The default behavior of this method is to call setContentLengthLong(long len) on the wrapped response object.

Specified by:

setContentLengthLong in interface ServletResponse

Parameters:

len - a long specifying the length of the content being returned to the client; sets the Content-Length header

setContentType

public void setContentType(String type)

The default behavior of this method is to call setContentType(String type) on the wrapped response object.

Specified by:

setContentType in interface ServletResponse

Parameters:

type - a String specifying the MIME type of the content

See Also:

ServletResponse.setLocale(java.util.Locale), ServletResponse.setCharacterEncoding(java.lang.String), ServletResponse.getOutputStream(), ServletResponse.getWriter()

getContentType

public String getContentType()

The default behavior of this method is to return getContentType() on the wrapped response object.

Specified by:

getContentType in interface ServletResponse

Returns:

a String specifying the content type, for example, text/html; charset=UTF-8, or null

Since:

Servlet 2.4

setBufferSize

public void setBufferSize(int size)

The default behavior of this method is to call setBufferSize(int size) on the wrapped response object.

Specified by:

setBufferSize in interface ServletResponse

Parameters:

size - the preferred buffer size

See Also:

ServletResponse.getBufferSize(), ServletResponse.flushBuffer(), ServletResponse.isCommitted(), ServletResponse.reset()

getBufferSize

public int getBufferSize()

The default behavior of this method is to return getBufferSize() on the wrapped response object.

Specified by:

getBufferSize in interface ServletResponse

Returns:

the actual buffer size used

See Also:

ServletResponse.setBufferSize(int), ServletResponse.flushBuffer(), ServletResponse.isCommitted(), ServletResponse.reset()

flushBuffer

public void flushBuffer()
                 throws IOException

The default behavior of this method is to call flushBuffer() on the wrapped response object.

Specified by:

flushBuffer in interface ServletResponse

Throws:

IOException - if the act of flushing the buffer cannot be completed.

See Also:

ServletResponse.setBufferSize(int), ServletResponse.getBufferSize(), ServletResponse.isCommitted(), ServletResponse.reset()

isCommitted

public boolean isCommitted()

The default behavior of this method is to return isCommitted() on the wrapped response object.

Specified by:

isCommitted in interface ServletResponse

Returns:

a boolean indicating if the response has been committed

See Also:

ServletResponse.setBufferSize(int), ServletResponse.getBufferSize(), ServletResponse.flushBuffer(), ServletResponse.reset()

reset

public void reset()

The default behavior of this method is to call reset() on the wrapped response object.

Specified by:

reset in interface ServletResponse

See Also:

ServletResponse.setBufferSize(int), ServletResponse.getBufferSize(), ServletResponse.flushBuffer(), ServletResponse.isCommitted()

resetBuffer

public void resetBuffer()

The default behavior of this method is to call resetBuffer() on the wrapped response object.

Specified by:

resetBuffer in interface ServletResponse

See Also:

ServletResponse.setBufferSize(int), ServletResponse.getBufferSize(), ServletResponse.isCommitted(), ServletResponse.reset()

setLocale

public void setLocale(Locale loc)

The default behavior of this method is to call setLocale(Locale loc) on the wrapped response object.

Specified by:

setLocale in interface ServletResponse

Parameters:

loc - the locale of the response

See Also:

ServletResponse.getLocale(), ServletResponse.setContentType(java.lang.String), ServletResponse.setCharacterEncoding(java.lang.String)

getLocale

public Locale getLocale()

The default behavior of this method is to return getLocale() on the wrapped response object.

Specified by:

getLocale in interface ServletResponse

Returns:

the Locale for this response.

See Also:

ServletResponse.setLocale(java.util.Locale)

isWrapperFor

public boolean isWrapperFor(ServletResponse wrapped)

Checks (recursively) if this ServletResponseWrapper wraps the given ServletResponse instance.

Parameters:

wrapped - the ServletResponse instance to search for

Returns:

true if this ServletResponseWrapper wraps the given ServletResponse instance, false otherwise

Since:

Servlet 3.0

isWrapperFor

public boolean isWrapperFor(Class<?> wrappedType)

Checks (recursively) if this ServletResponseWrapper wraps a ServletResponse of the given class type.

Parameters:

wrappedType - the ServletResponse class type to search for

Returns:

true if this ServletResponseWrapper wraps a ServletResponse of the given class type, false otherwise

Throws:

IllegalArgumentException - if the given class does not implement ServletResponse

Since:

Servlet 3.0