com.ibm.portal.resolver.data
Interface DataSourceChecksum

All Superinterfaces:

Addressable, DataSource, DataSourceFragment, Disposable, TimeStamped

All Known Implementing Classes:

AbstractDataSource

public interface DataSourceChecksum
extends DataSource

Provides the checksum for a data source. May be optionally implemented by DataSource implementations.

Since:

8.0.0.1

Note:

This interface is designed to be implemented by clients.

Field Summary

static long

NONE special checksum value indicating no checksum is available

Fields inherited from interface com.ibm.portal.resolver.data.DataSource

CONTENT_TYPE_UNKNOWN, CREATION_UNKNOWN, EXPIRATION_UNKNOWN, LAST_MODIFICATION_UNKNOWN, MAX_AGE_INFINITE, MAX_AGE_NONE, ROOT_DATE

Fields inherited from interface com.ibm.portal.resolver.data.Addressable

EMPTY_PARAMETERS

Method Summary

long	getChecksum() Returns the checksum of the data source.
boolean	isWeak() Returns whether this is a "strong" or "weak" checksum.

Methods inherited from interface com.ibm.portal.resolver.data.DataSource

getContentType, getCreated, getExpiration, getLastModified

Methods inherited from interface com.ibm.portal.resolver.data.Addressable

getParameters, getURI

Methods inherited from interface com.ibm.portal.Disposable

dispose

Field Detail

NONE

static final long NONE

special checksum value indicating no checksum is available

See Also:

Constant Field Values

Method Detail

getChecksum

long getChecksum()

Returns the checksum of the data source.

Returns:

the checksum of the data source. The special value NONE indicates that no checksum has been computed.

isWeak

boolean isWeak()

Returns whether this is a "strong" or "weak" checksum. A "strong" checksum changes, whenever any aspect of the resources the data source represents change, the "weak" checksum only changes when significant changes to the resources occured.

Returns:

true if the checksum is "weak", false otherwise.