org.apache.xmlgraphics.image.loader.cache

Class DefaultExpirationPolicy

java.lang.Object

org.apache.xmlgraphics.image.loader.cache.DefaultExpirationPolicy

All Implemented Interfaces:

ExpirationPolicy

public class DefaultExpirationPolicy
extends java.lang.Object
implements ExpirationPolicy

Implements the default expiration policy for the image cache.

Field Summary

Fields

Modifier and Type	Field and Description
static int	EXPIRATION_IMMEDIATE
static int	EXPIRATION_NEVER
private int	expirationAfter

Constructor Summary

Constructors

Constructor and Description
DefaultExpirationPolicy() Creates a new policy with default settings (expiration in 60 seconds).
DefaultExpirationPolicy(int expirationAfter) Creates a new policy.

Method Summary

Modifier and Type	Method and Description
boolean	isExpired(TimeStampProvider provider, long timestamp) Indicates whether a cache entry is expired given its creation time stamp.
private boolean	isNeverExpired()

Methods inherited from class java.lang.Object

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

Field Detail

EXPIRATION_IMMEDIATE

public static final int EXPIRATION_IMMEDIATE

See Also:

Constant Field Values

EXPIRATION_NEVER

public static final int EXPIRATION_NEVER

See Also:

Constant Field Values

expirationAfter

private int expirationAfter

Constructor Detail

DefaultExpirationPolicy

public DefaultExpirationPolicy()

Creates a new policy with default settings (expiration in 60 seconds).

DefaultExpirationPolicy

public DefaultExpirationPolicy(int expirationAfter)

Creates a new policy.

Parameters:

expirationAfter - the expiration in seconds (a negative value means: never expire)

Method Detail

isNeverExpired

private boolean isNeverExpired()

isExpired

public boolean isExpired(TimeStampProvider provider,
                         long timestamp)

Indicates whether a cache entry is expired given its creation time stamp.

Specified by:

isExpired in interface ExpirationPolicy

Parameters:

provider - the provider for new time stamps

timestamp - the creation time stamp (the semantics of System.currentTimeMillis() apply)

Returns:

true if the entry is to be considered expired, false if not