Package org.wikidata.wdtk.datamodel.implementation

Class StatementImpl

java.lang.Object

org.wikidata.wdtk.datamodel.implementation.StatementImpl

All Implemented Interfaces:

java.io.Serializable, Statement

public class StatementImpl
extends java.lang.Object
implements Statement, java.io.Serializable

Implementation of Statement.

Author:

Markus Kroetzsch

See Also:

Serialized Form

Method Summary

Modifier and Type	Method	Description
boolean	equals(java.lang.Object obj)
Claim	getClaim()	Get the Claim object that this statement refers to.
StatementRank	getRank()
java.util.List<? extends Reference>	getReferences()	Get a list of references for this Statement.
java.lang.String	getStatementId()	Return the id used to identify this statement.
Value	getValue()	Convenience method to get the value of the statement's claim's main snak, or null if there is none.
int	hashCode()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

getClaim

public Claim getClaim()

Description copied from interface: Statement

Get the Claim object that this statement refers to.

Specified by:

getClaim in interface Statement

Returns:

the claim that this statement refers to

getRank

public StatementRank getRank()

Specified by:

getRank in interface Statement

Returns:

the rank of the Statement

See Also:

StatementRank

getReferences

public java.util.List<? extends Reference> getReferences()

Description copied from interface: Statement

Get a list of references for this Statement. Each reference is represented by a list of Snaks, which provide information about the reference.

Specified by:

getReferences in interface Statement

Returns:

the list of references

getStatementId

public java.lang.String getStatementId()

Description copied from interface: Statement

Return the id used to identify this statement.

Statement ids are used by Wikibase to allow certain interactions though the API, especially the atomic modification of Statements (modifications of statements can be viewed as deletions followed by insertions, but doing this in several steps though the API is not practical). In the current Wikibase implementation, the id is a string that begins with the (sometimes lowercased) local ID of the subject of the statement, followed by a dollar sign and a randomly generated UUID. Thus statements of different subjects can never have the same id, and it is extremely unlikely that two statements of the one subject ever have the same id. However, it is possible that two statements with the same content differ in their id, since the id is not based on the content.

Wikidata Toolkit generally requires ids to be specified but you can use the empty string to indicate that a statement has no id. This will also be respected when serializing data as JSON, i.e., rather than setting the statement id to an empty string in JSON, the key will simply be omitted. This is useful for creating new statements through the API.

Callers should not make any assumptions about the stability of statement ids over time, or about the internal format of the ids.

Specified by:

getStatementId in interface Statement

Returns:

the statement string id

getValue

public Value getValue()

Description copied from interface: Statement

Convenience method to get the value of the statement's claim's main snak, or null if there is none.

Specified by:

getValue in interface Statement

Returns:

main value of the statement, or null

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object