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

Modifier and Type	Method and Description
static Optional<LocalDateTime>	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 Optional<LocalDateTime>	parseGMTString(String value)
static String	toGMTString(LocalDateTime time)
static Header	toHttpDate(String headerName, LocalDateTime 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 Optional<LocalDateTime> fromHttpDate(Header header)

parseGMTString

public static Optional<LocalDateTime> parseGMTString(String value)

toHttpDate

public static Header toHttpDate(String headerName,
                                LocalDateTime time)

toGMTString

public static String toGMTString(LocalDateTime 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)