org.codehaus.httpcache4j

Class HeaderUtils

java.lang.Object

org.codehaus.httpcache4j.HeaderUtils

public final class HeaderUtils
extends Object

A collection header utilities.

Field Summary

Fields

Modifier and Type	Field and Description
static String	PATTERN_RFC1123

Method Summary

Methods

Modifier and Type	Method and Description
static org.joda.time.DateTime	fromHttpDate(Header header)
static long	getHeaderAsDate(Header header)
static boolean	hasCacheableHeaders(Headers headers) From http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.4.
static org.joda.time.DateTime	parseGMTString(String value)
static String	toGMTString(org.joda.time.DateTime time)
static Header	toHttpDate(String headerName, org.joda.time.DateTime time)
static List<LinkDirective>	toLinkDirectives(Header header)
static Header	toLinkHeader(List<LinkDirective> linkDirectives)

Methods inherited from class java.lang.Object

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

Field Detail

PATTERN_RFC1123

public static final String PATTERN_RFC1123

See Also:

Constant Field Values

Method Detail

fromHttpDate

public static org.joda.time.DateTime fromHttpDate(Header header)

parseGMTString

public static org.joda.time.DateTime parseGMTString(String value)

toHttpDate

public static Header toHttpDate(String headerName,
                org.joda.time.DateTime time)

toGMTString

public static String toGMTString(org.joda.time.DateTime time)

getHeaderAsDate

public static long getHeaderAsDate(Header header)

hasCacheableHeaders

public static boolean hasCacheableHeaders(Headers headers)

From http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.4.

Unless specifically constrained by a cache-control (section 14.9) directive, a caching system MAY always store a successful response (see section 13.8) as a cache entry, MAY return it without validation if it is fresh, and MAY return it after successful validation. If there is neither a cache validator nor an explicit expiration time associated with a response, we do not expect it to be cached, but certain caches MAY violate this expectation (for example, when little or no network connectivity is available). A client can usually detect that such a response was taken from a cache by comparing the Date header to the current time.

Parameters:

headers - the headers to analyze

Returns:

true if the headers were cacheable, false if not.

toLinkHeader

public static Header toLinkHeader(List<LinkDirective> linkDirectives)

toLinkDirectives

public static List<LinkDirective> toLinkDirectives(Header header)