org.hd.d.pg2k.svrCore
Class ExhibitPropsGlobalImmutable.EPGIDiff

java.lang.Object
  org.hd.d.pg2k.svrCore.ExhibitPropsGlobalImmutable.EPGIDiff

All Implemented Interfaces:

java.io.ObjectInputValidation, java.io.Serializable

Enclosing class:

ExhibitPropsGlobalImmutable

public static final class ExhibitPropsGlobalImmutable.EPGIDiff
extends java.lang.Object
implements java.io.Serializable, java.io.ObjectInputValidation

Immutable record of the difference between two EPGI instances. This contains the "diffable" items.

See Also:

Serialized Form

locationDBTimestampNew

public final long locationDBTimestampNew

The new location DB timestamp; strictly positive, or zero for empty diff.

locationDBDiff

private final PropertiesDiff locationDBDiff

The diffed location DB in properties format; non-empty else null.

treedescTimestampNew

public final long treedescTimestampNew

The new treedesc timestamp; strictly positive, or zero for empty diff.

treedescDiff

private final PropertiesBundleDiff treedescDiff

The diffed treedesc in properties format; non-empty else null.

serialVersionUID

private static final long serialVersionUID

Serial UID.

See Also:

Constant Field Values

ExhibitPropsGlobalImmutable.EPGIDiff

public ExhibitPropsGlobalImmutable.EPGIDiff()

Create an empty instance.

ExhibitPropsGlobalImmutable.EPGIDiff

public ExhibitPropsGlobalImmutable.EPGIDiff(long locationDBTimestampNew,
                                            PropertiesDiff locationDBDiff,
                                            long treedescTimestampNew,
                                            PropertiesBundleDiff treedescDiff)

Create an instance.

createDiff

public static ExhibitPropsGlobalImmutable.EPGIDiff createDiff(ExhibitPropsGlobalImmutable e1,
                                                              ExhibitPropsGlobalImmutable e2)
                                                       throws AllExhibitPropertiesDelta.DiffException

Create a diff from the old EPGI value to the new one. If the new locationDB is absent then we fake a timestamp of now.

Throws:

AllExhibitPropertiesDelta.DiffException

applyDiff

public static ExhibitPropsGlobalImmutable applyDiff(ExhibitPropsGlobalImmutable oldEpgi,
                                                    ExhibitPropsGlobalImmutable.EPGIDiff diff)

Apply diff to derive new EPGI; never null.

Parameters:

oldEpgi - null is treated as if an empty EPGI

diff - diff to apply; never null

Returns:

new non-null EPGI value from old one (null implies empty) and diff

readResolve

protected java.lang.Object readResolve()
                                throws java.io.ObjectStreamException

Deserialise: use constructor for validation, defensive copying, conversion from old formats, etc. Also allows us to (re)normalise the data in this instance.

Throws:

java.io.ObjectStreamException

validateObject

public void validateObject()
                    throws java.io.InvalidObjectException

Checks that the object is internally consistent.

Specified by:

validateObject in interface java.io.ObjectInputValidation

Throws:

java.io.InvalidObjectException