com.prolifics.servlet
Class FilterHttpServletResponse

java.lang.Object
  com.prolifics.servlet.FilterHttpServletResponse

All Implemented Interfaces:

javax.servlet.http.HttpServletResponse, javax.servlet.ServletResponse

public class FilterHttpServletResponse
extends java.lang.Object
implements javax.servlet.http.HttpServletResponse

An HTTP servlet response. This interface allows a servlet's service method to manipulate HTTP-protocol specified header information and return data to its client. It is implemented by network service developers for use within servlets.

Field Summary

Fields inherited from interface javax.servlet.http.HttpServletResponse

SC_ACCEPTED, SC_BAD_GATEWAY, SC_BAD_REQUEST, SC_CONFLICT, SC_CONTINUE, SC_CREATED, SC_EXPECTATION_FAILED, SC_FORBIDDEN, SC_GATEWAY_TIMEOUT, SC_GONE, SC_HTTP_VERSION_NOT_SUPPORTED, SC_INTERNAL_SERVER_ERROR, SC_LENGTH_REQUIRED, SC_METHOD_NOT_ALLOWED, SC_MOVED_PERMANENTLY, SC_MOVED_TEMPORARILY, SC_MULTIPLE_CHOICES, SC_NO_CONTENT, SC_NON_AUTHORITATIVE_INFORMATION, SC_NOT_ACCEPTABLE, SC_NOT_FOUND, SC_NOT_IMPLEMENTED, SC_NOT_MODIFIED, SC_OK, SC_PARTIAL_CONTENT, SC_PAYMENT_REQUIRED, SC_PRECONDITION_FAILED, SC_PROXY_AUTHENTICATION_REQUIRED, SC_REQUEST_ENTITY_TOO_LARGE, SC_REQUEST_TIMEOUT, SC_REQUEST_URI_TOO_LONG, SC_REQUESTED_RANGE_NOT_SATISFIABLE, SC_RESET_CONTENT, SC_SEE_OTHER, SC_SERVICE_UNAVAILABLE, SC_SWITCHING_PROTOCOLS, SC_UNAUTHORIZED, SC_UNSUPPORTED_MEDIA_TYPE, SC_USE_PROXY

Constructor Summary

FilterHttpServletResponse(javax.servlet.http.HttpServletResponse res)

Method Summary

void	addCookie(javax.servlet.http.Cookie cookie) Adds the specified cookie to the response.
void	addDateHeader(java.lang.String arg0, long arg1)
void	addHeader(java.lang.String arg0, java.lang.String arg1)
void	addIntHeader(java.lang.String arg0, int arg1)
boolean	containsHeader(java.lang.String name) Checks whether the response message header has a field with the specified name.
java.lang.String	encodeRedirectUrl(java.lang.String url) Encodes the specified URL for use in the sendRedirect method or, if encoding is not needed, returns the URL unchanged.
java.lang.String	encodeRedirectURL(java.lang.String url) Encodes the specified URL for use in the sendRedirect method or, if encoding is not needed, returns the URL unchanged.
java.lang.String	encodeUrl(java.lang.String url) Encodes the specified URL by including the session ID in it, or, if encoding is not needed, returns the URL unchanged.
java.lang.String	encodeURL(java.lang.String url) Encodes the specified URL by including the session ID in it, or, if encoding is not needed, returns the URL unchanged.
void	flushBuffer()
int	getBufferSize()
java.lang.String	getCharacterEncoding() Returns the character set encoding used for this MIME body.
java.util.Locale	getLocale()
javax.servlet.ServletOutputStream	getOutputStream() Returns an output stream for writing binary response data.
java.io.PrintWriter	getWriter() Returns a print writer for writing formatted text responses.
boolean	isCommitted()
void	reset()
void	sendError(int sc) Sends an error response to the client using the specified status code and a default message.
void	sendError(int sc, java.lang.String msg) Sends an error response to the client using the specified status code and descriptive message.
void	sendRedirect(java.lang.String location) Sends a temporary redirect response to the client using the specified redirect location URL.
void	setBufferSize(int arg0)
void	setContentLength(int len) Sets the content length for this response.
void	setContentType(java.lang.String type) Sets the content type for this response.
void	setDateHeader(java.lang.String name, long date) Adds a field to the response header with the given name and date-valued field.
void	setHeader(java.lang.String name, java.lang.String value) Adds a field to the response header with the given name and value.
void	setIntHeader(java.lang.String name, int value) Adds a field to the response header with the given name and integer value.
void	setLocale(java.util.Locale arg0)
void	setStatus(int sc) Sets the status code for this response.
void	setStatus(int sc, java.lang.String sm) Sets the status code and message for this response.

Methods inherited from class java.lang.Object

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

Constructor Detail

FilterHttpServletResponse

public FilterHttpServletResponse(javax.servlet.http.HttpServletResponse res)

Method Detail

addCookie

public void addCookie(javax.servlet.http.Cookie cookie)

Adds the specified cookie to the response. It can be called multiple times to set more than one cookie.

Specified by:

addCookie in interface javax.servlet.http.HttpServletResponse

Parameters:

cookie - the Cookie to return to the client

containsHeader

public boolean containsHeader(java.lang.String name)

Checks whether the response message header has a field with the specified name.

Specified by:

containsHeader in interface javax.servlet.http.HttpServletResponse

Parameters:

name - the header field name

Returns:

true if the response message header has a field with the specified name; false otherwise

setStatus

public void setStatus(int sc,
                      java.lang.String sm)

Sets the status code and message for this response. If the field had already been set, the new value overwrites the previous one. The message is sent as the body of an HTML page, which is returned to the user to describe the problem. The page is sent with a default HTML header; the message is enclosed in simple body tags (<body></body>).

Specified by:

setStatus in interface javax.servlet.http.HttpServletResponse

Parameters:

sc - the status code

sm - the status message

setStatus

public void setStatus(int sc)

Sets the status code for this response. This method is used to set the return status code when there is no error (for example, for the status codes SC_OK or SC_MOVED_TEMPORARILY). If there is an error, the sendError method should be used instead.

Specified by:

setStatus in interface javax.servlet.http.HttpServletResponse

Parameters:

sc - the status code

See Also:

sendError(int, java.lang.String)

setHeader

public void setHeader(java.lang.String name,
                      java.lang.String value)

Adds a field to the response header with the given name and value. If the field had already been set, the new value overwrites the previous one. The containsHeader method can be used to test for the presence of a header before setting its value.

Specified by:

setHeader in interface javax.servlet.http.HttpServletResponse

Parameters:

name - the name of the header field

value - the header field's value

See Also:

containsHeader(java.lang.String)

setIntHeader

public void setIntHeader(java.lang.String name,
                         int value)

Adds a field to the response header with the given name and integer value. If the field had already been set, the new value overwrites the previous one. The containsHeader method can be used to test for the presence of a header before setting its value.

Specified by:

setIntHeader in interface javax.servlet.http.HttpServletResponse

Parameters:

name - the name of the header field

value - the header field's integer value

See Also:

containsHeader(java.lang.String)

setDateHeader

public void setDateHeader(java.lang.String name,
                          long date)

Adds a field to the response header with the given name and date-valued field. The date is specified in terms of milliseconds since the epoch. If the date field had already been set, the new value overwrites the previous one. The containsHeader method can be used to test for the presence of a header before setting its value.

Specified by:

setDateHeader in interface javax.servlet.http.HttpServletResponse

Parameters:

name - the name of the header field

date - the header field's date value

See Also:

containsHeader(java.lang.String)

sendError

public void sendError(int sc,
                      java.lang.String msg)
               throws java.io.IOException

Sends an error response to the client using the specified status code and descriptive message. If setStatus has previously been called, it is reset to the error status code. The message is sent as the body of an HTML page, which is returned to the user to describe the problem. The page is sent with a default HTML header; the message is enclosed in simple body tags (<body></body>).

Specified by:

sendError in interface javax.servlet.http.HttpServletResponse

Parameters:

sc - the status code

msg - the detail message

Throws:

java.io.IOException - If an I/O error has occurred.

sendError

public void sendError(int sc)
               throws java.io.IOException

Sends an error response to the client using the specified status code and a default message.

Specified by:

sendError in interface javax.servlet.http.HttpServletResponse

Parameters:

sc - the status code

Throws:

java.io.IOException - If an I/O error has occurred.

sendRedirect

public void sendRedirect(java.lang.String location)
                  throws java.io.IOException

Sends a temporary redirect response to the client using the specified redirect location URL. The URL must be absolute (for example, https://hostname/path/file.html). Relative URLs are not permitted here.

Specified by:

sendRedirect in interface javax.servlet.http.HttpServletResponse

Parameters:

location - the redirect location URL

Throws:

java.io.IOException - If an I/O error has occurred.

encodeUrl

public java.lang.String encodeUrl(java.lang.String url)

Encodes the specified URL by including the session ID in it, or, if encoding is not needed, returns the URL unchanged. The implementation of this method should include the logic to determine whether the session ID needs to be encoded in the URL. For example, if the browser supports cookies, or session tracking is turned off, URL encoding is unnecessary.

All URLs emitted by a Servlet should be run through this method. Otherwise, URL rewriting cannot be used with browsers which do not support cookies.

Specified by:

encodeUrl in interface javax.servlet.http.HttpServletResponse

Parameters:

url - the url to be encoded.

Returns:

the encoded URL if encoding is needed; the unchanged URL otherwise.

encodeURL

public java.lang.String encodeURL(java.lang.String url)

Encodes the specified URL by including the session ID in it, or, if encoding is not needed, returns the URL unchanged. The implementation of this method should include the logic to determine whether the session ID needs to be encoded in the URL. For example, if the browser supports cookies, or session tracking is turned off, URL encoding is unnecessary.

All URLs emitted by a Servlet should be run through this method. Otherwise, URL rewriting cannot be used with browsers which do not support cookies.

Specified by:

encodeURL in interface javax.servlet.http.HttpServletResponse

Parameters:

url - the url to be encoded.

Returns:

the encoded URL if encoding is needed; the unchanged URL otherwise.

encodeRedirectUrl

public java.lang.String encodeRedirectUrl(java.lang.String url)

Encodes the specified URL for use in the sendRedirect method or, if encoding is not needed, returns the URL unchanged. The implementation of this method should include the logic to determine whether the session ID needs to be encoded in the URL. Because the rules for making this determination differ from those used to decide whether to encode a normal link, this method is seperate from the encodeUrl method.

All URLs sent to the HttpServletResponse.sendRedirect method should be run through this method. Otherwise, URL rewriting canont be used with browsers which do not support cookies.

Specified by:

encodeRedirectUrl in interface javax.servlet.http.HttpServletResponse

Parameters:

url - the url to be encoded.

Returns:

the encoded URL if encoding is needed; the unchanged URL otherwise.

See Also:

sendRedirect(java.lang.String), encodeUrl(java.lang.String)

encodeRedirectURL

public java.lang.String encodeRedirectURL(java.lang.String url)

Encodes the specified URL for use in the sendRedirect method or, if encoding is not needed, returns the URL unchanged. The implementation of this method should include the logic to determine whether the session ID needs to be encoded in the URL. Because the rules for making this determination differ from those used to decide whether to encode a normal link, this method is seperate from the encodeUrl method.

All URLs sent to the HttpServletResponse.sendRedirect method should be run through this method. Otherwise, URL rewriting canont be used with browsers which do not support cookies.

Specified by:

encodeRedirectURL in interface javax.servlet.http.HttpServletResponse

Parameters:

url - the url to be encoded.

Returns:

the encoded URL if encoding is needed; the unchanged URL otherwise.

See Also:

sendRedirect(java.lang.String), encodeURL(java.lang.String)

setContentLength

public void setContentLength(int len)

Sets the content length for this response.

Specified by:

setContentLength in interface javax.servlet.ServletResponse

Parameters:

len - the content length

setContentType

public void setContentType(java.lang.String type)

Sets the content type for this response. This type may later be implicitly modified by addition of properties such as the MIME charset=<value> if the service finds it necessary, and the appropriate media type property has not been set.

This response property may only be assigned one time. If a writer is to be used to write a text response, this method must be called before the method getWriter. If an output stream will be used to write a response, this method must be called before the output stream is used to write response data.

Specified by:

setContentType in interface javax.servlet.ServletResponse

Parameters:

type - the content's MIME type

See Also:

getOutputStream(), getWriter()

getOutputStream

public javax.servlet.ServletOutputStream getOutputStream()
                                                  throws java.io.IOException

Returns an output stream for writing binary response data.

Specified by:

getOutputStream in interface javax.servlet.ServletResponse

Throws:

java.lang.IllegalStateException - if getWriter has been called on this same request.

java.io.IOException - if an I/O exception has occurred

See Also:

getWriter()

getWriter

public java.io.PrintWriter getWriter()
                              throws java.io.IOException

Returns a print writer for writing formatted text responses. The MIME type of the response will be modified, if necessary, to reflect the character encoding used, through the charset=... property. This means that the content type must be set before calling this method.

Specified by:

getWriter in interface javax.servlet.ServletResponse

Throws:

java.io.UnsupportedEncodingException - if no such encoding can be provided

java.lang.IllegalStateException - if getOutputStream has been called on this same request.

java.io.IOException - on other errors.

See Also:

getOutputStream(), setContentType(java.lang.String)

getCharacterEncoding

public java.lang.String getCharacterEncoding()

Returns the character set encoding used for this MIME body. The character encoding is either the one specified in the assigned content type, or one which the client understands. If no content type has yet been assigned, it is implicitly set to text/plain

Specified by:

getCharacterEncoding in interface javax.servlet.ServletResponse

setBufferSize

public void setBufferSize(int arg0)

Specified by:

setBufferSize in interface javax.servlet.ServletResponse

addIntHeader

public void addIntHeader(java.lang.String arg0,
                         int arg1)

Specified by:

addIntHeader in interface javax.servlet.http.HttpServletResponse

flushBuffer

public void flushBuffer()
                 throws java.io.IOException

Specified by:

flushBuffer in interface javax.servlet.ServletResponse

Throws:

java.io.IOException

getBufferSize

public int getBufferSize()

Specified by:

getBufferSize in interface javax.servlet.ServletResponse

addDateHeader

public void addDateHeader(java.lang.String arg0,
                          long arg1)

Specified by:

addDateHeader in interface javax.servlet.http.HttpServletResponse

reset

public void reset()

Specified by:

reset in interface javax.servlet.ServletResponse

addHeader

public void addHeader(java.lang.String arg0,
                      java.lang.String arg1)

Specified by:

addHeader in interface javax.servlet.http.HttpServletResponse

isCommitted

public boolean isCommitted()

Specified by:

isCommitted in interface javax.servlet.ServletResponse

setLocale

public void setLocale(java.util.Locale arg0)

Specified by:

setLocale in interface javax.servlet.ServletResponse

getLocale

public java.util.Locale getLocale()

Specified by:

getLocale in interface javax.servlet.ServletResponse