org.appng.api.support

Class HttpHeaderUtils

java.lang.Object

org.appng.api.support.HttpHeaderUtils

public class HttpHeaderUtils
extends Object

Utility-class that helps dealing with several HTTP-Headers

Author:

Matthias Müller

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	HttpHeaderUtils.HttpResource A resource that has been requested by an HttpServletRequest and eventually needs to be updated

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.apache.commons.lang3.time.FastDateFormat	HTTP_DATE

Constructor Summary

Constructors

Constructor and Description
HttpHeaderUtils()

Method Summary

Modifier and Type	Method and Description
static byte[]	handleModifiedHeaders(HttpServletRequest servletRequest, HttpServletResponse servletResponse, HttpHeaderUtils.HttpResource resource, boolean output) Handles the "Last-Modified" and "If-Modified-Since" headers for the give request/response pair.

Methods inherited from class java.lang.Object

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

Field Detail

HTTP_DATE

protected static final org.apache.commons.lang3.time.FastDateFormat HTTP_DATE

Constructor Detail

HttpHeaderUtils

public HttpHeaderUtils()

Method Detail

handleModifiedHeaders

public static byte[] handleModifiedHeaders(HttpServletRequest servletRequest,
                                           HttpServletResponse servletResponse,
                                           HttpHeaderUtils.HttpResource resource,
                                           boolean output)
                                    throws IOException

Handles the "Last-Modified" and "If-Modified-Since" headers for the give request/response pair. Sets the "Last-Modified"-header for the response and reads the "If-Modified-Since"-header from the request.

Parameters:

servletRequest - the current HttpServletRequest

servletResponse - the current HttpServletResponse

resource - the HttpHeaderUtils.HttpResource to process

output - whether or not to write the response data to the OutputStream of the HttpServletResponse, also setting the content-type and content length

Returns:

the response-data, which may have a length of 0 in case "If-Modified-Since" was set for the request and the HttpHeaderUtils.HttpResource has'nt been updated since then

Throws:

IOException - if an error occurred while reading/updating the HttpHeaderUtils.HttpResource