org.ov4j.data
Class Item<T extends java.lang.Comparable<? super T> & java.lang.Cloneable & java.io.Serializable,C extends java.lang.Comparable<? super C>>

java.lang.Object
  org.ov4j.data.Item<T,C>

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class Item<T extends java.lang.Comparable<? super T> & java.lang.Cloneable & java.io.Serializable,C extends java.lang.Comparable<? super C>>
extends java.lang.Object
implements java.io.Serializable, java.lang.Cloneable

This is the objects stored in the system, it holds all versions for a given ID.

Author:

smolloy

See Also:

Serialized Form

Field Summary

static Item<?,?>[]	EMPTY_ARRAY Empty Item array.
static int	NO_ROLLOVER Use this version rollover to keep whole history.

Constructor Summary

Item()
Constructor.

Method Summary

boolean	addVersion(Version<T> version, int versionRollover) Add a version to this item.
Item<T,C>	clone()
boolean	equals(java.lang.Object o)
C	getId()
Version<T>	getLatest()
Version<T>	getLatestBefore(long tstamp)
long	getModificationStamp()
Version<T>[]	getVersions()
int	hashCode()
int	numVersions()
void	setId(C id)
void	setLatest(Version<T> latest)
void	setModificationStamp(long modificationStamp)
void	setVersions(Version<T>[] newVersions)
java.lang.String	toString()
void	versions(Version<T>[] newVersions)

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

EMPTY_ARRAY

public static final Item<?,?>[] EMPTY_ARRAY

Empty Item array.

NO_ROLLOVER

public static final int NO_ROLLOVER

Use this version rollover to keep whole history.

See Also:

Constant Field Values

Constructor Detail

Item

public Item()

Constructor.

Method Detail

addVersion

public boolean addVersion(Version<T> version,
                          int versionRollover)

Add a version to this item.

Parameters:

version - The new version to be added.

versionRollover - How many versions to keep in history.

Returns:

True if the version was successfully added.

clone

public Item<T,C> clone()
                                                                                                                                           throws java.lang.CloneNotSupportedException

Overrides:

clone in class java.lang.Object

Throws:

java.lang.CloneNotSupportedException

See Also:

Object.clone()

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

See Also:

Object.equals(java.lang.Object)

getId

public C getId()

Returns:

Returns the id.

getLatest

public Version<T> getLatest()

Returns:

The latest version of this item.

getLatestBefore

public Version<T> getLatestBefore(long tstamp)

Parameters:

tstamp - Timestamp to use for fetching the version.

Returns:

the latest version of this item before the specified timstamp.

getModificationStamp

public long getModificationStamp()

Returns:

Returns the modificationStamp.

getVersions

public Version<T>[] getVersions()

Returns:

Returns the versions.

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

See Also:

Object.hashCode()

numVersions

public int numVersions()

Returns:

Number of versions in this item.

setId

public void setId(C id)

Parameters:

id - The id to set.

setLatest

public void setLatest(Version<T> latest)

Parameters:

latest - The latest version to set.

setModificationStamp

public void setModificationStamp(long modificationStamp)

Parameters:

modificationStamp - The modificationStamp to set.

setVersions

public void setVersions(Version<T>[] newVersions)

Parameters:

versions - The versions to set.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

See Also:

Object.toString()

versions

public void versions(Version<T>[] newVersions)

Parameters:

versions - The versions to set.