prajna.data.rdf

Class RdfTriple

java.lang.Object

prajna.data.rdf.RdfTriple

All Implemented Interfaces:

java.lang.Comparable<RdfTriple>

public class RdfTriple
extends java.lang.Object
implements java.lang.Comparable<RdfTriple>

Represents an RDF Triple. The triple can be used to represent the relationship of one OwlThing object to another, or to store RDF literal values for a particular object.

Author:

Edward Swing

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RdfTriple.TripleType This enumeration specifies the type of a relationship, as defined by the source of the relationship definition.

Constructor Summary

Constructors

Constructor and Description
RdfTriple(RdfThing thing, Property relationProperty, RdfThing relatedThing, RdfTriple.TripleType relationType) Create an RDF triple that relates the specified thing to the related thing with the specified property.
RdfTriple(RdfThing thing, java.lang.String relationName, RdfThing relatedThing, RdfTriple.TripleType relationType) Create an RDF triple that relates the specified thing to the related thing with the specified property.
RdfTriple(java.lang.String subj, java.lang.String pred, java.lang.String obj) Create a simple RdfThing from three string arguments.

Method Summary

Methods

Modifier and Type	Method and Description
int	compareTo(RdfTriple triple) Compares this object with the specified object for order.
boolean	equals(java.lang.Object obj) Returns whether another object is the same as this one.
RdfThing	getObject() Get the object for this triple
Property	getProperty() Get the property, or predicate, of this triple
RdfThing	getSubject() Get the subject for this triple.
RdfTriple.TripleType	getType() Get the relationship type
int	hashCode() Get the hash code for this object.
boolean	matches(RdfTriple other) Return if this triple matches another triple.
java.lang.String	toString() Return a string representation of this OwlRelation

Methods inherited from class java.lang.Object

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

Constructor Detail

RdfTriple

public RdfTriple(RdfThing thing,
         Property relationProperty,
         RdfThing relatedThing,
         RdfTriple.TripleType relationType)

Create an RDF triple that relates the specified thing to the related thing with the specified property.

Parameters:

thing - corresponds to the subject of the RDF triple

relationProperty - property of the RDF triple

relatedThing - the Object of the RDF triple

relationType - the relation type.

RdfTriple

public RdfTriple(RdfThing thing,
         java.lang.String relationName,
         RdfThing relatedThing,
         RdfTriple.TripleType relationType)

Create an RDF triple that relates the specified thing to the related thing with the specified property. This constructor looks up the property name in the Property cache, creating a new property if it has not been created.

Parameters:

thing - corresponds to the subject of the RDF triple

relationName - the name of the property in the RDF triple

relatedThing - the Object of the RDF triple

relationType - the relation type.

RdfTriple

public RdfTriple(java.lang.String subj,
         java.lang.String pred,
         java.lang.String obj)

Create a simple RdfThing from three string arguments. This method creates RdfThings for the subject and object. It looks up the property name in the Property cache, creating a new property if it has not been created.

Parameters:

subj - the subject of the RDF triple

pred - the predicate of the RDF triple

obj - the object of the RDF triple

Method Detail

compareTo

public int compareTo(RdfTriple triple)

Compares this object with the specified object for order. Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object. This method orders OwlRelations based upon the name of the base object, followed by name of the relationship, followed by the related object name. This ordering is consistent with the equals() method.

Specified by:

compareTo in interface java.lang.Comparable<RdfTriple>

Parameters:

triple - the other triple to compare to

Returns:

a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object.

Throws:

java.lang.ClassCastException - if an object other than an RdfTriple is being compared to this object.

equals

public boolean equals(java.lang.Object obj)

Returns whether another object is the same as this one. This method returns true if both the relation object name and the related thing name are the same.

Overrides:

equals in class java.lang.Object

Parameters:

obj - The object to compare to

Returns:

true if the other OwlRelation is the same as this one.

Throws:

java.lang.ClassCastException - if an object other than an OwlRelation is being compared to this object.

getObject

public RdfThing getObject()

Get the object for this triple

Returns:

the object

getProperty

public Property getProperty()

Get the property, or predicate, of this triple

Returns:

the property

getSubject

public RdfThing getSubject()

Get the subject for this triple.

Returns:

the subject

getType

public RdfTriple.TripleType getType()

Get the relationship type

Returns:

the relationship type

hashCode

public int hashCode()

Get the hash code for this object. This method derives the hash code from the names of the relation property and related object. It is consistent with equals()

Overrides:

hashCode in class java.lang.Object

Returns:

the integer hash code

matches

public boolean matches(RdfTriple other)

Return if this triple matches another triple. This method returns true if all non-null fields of this triple are equal to the fields in the other triple. Note that this method is not symmetric. This method is useful for unspecified triples and queries.

Parameters:

other - the other RdfTriple to match this triple to.

Returns:

true if the other RdfTriple matches this one.

toString

public java.lang.String toString()

Return a string representation of this OwlRelation

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this OwlRelation