org.jrdf.graph.mem
Class BlankNodeImpl

java.lang.Object
  org.jrdf.graph.AbstractBlankNode
      org.jrdf.graph.mem.BlankNodeImpl

All Implemented Interfaces:

BlankNode, MemNode, Node, ObjectNode, Serializable, SubjectNode, TypedNodeVisitable

public class BlankNodeImpl

extends AbstractBlankNode

implements MemNode

RDF blank node. Note that blank nodes are deliberately devoid of external indentifying attributes. Blank nodes, can either be subjects or objects.

Version:

$Revision: 1.1 $

Author:

Paul Gearon

See Also:

Serialized Form

Method Summary

boolean	equals(Object obj) While the internal structure of a BlankNode is not defined equality between two nodes should be able to be determined.
Long	getId() Retrieves an internal identifier for this node.
int	hashCode() Returns a hash-code value for this BlankNode.
String	toString() Returns the String value of this BlankNode as: uid#id (eg. 29fbf7ba364f1425dda058737d764603#69)
static BlankNode	valueOf(String nodeString) Parses a String in the format of: uid#id (eg. 29fbf7ba364f1425dda058737d764603#69) and creates a new BlankNodeImpl from it.

Methods inherited from class org.jrdf.graph.AbstractBlankNode

accept

Methods inherited from class java.lang.Object

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

Method Detail

getId

public Long getId()

Retrieves an internal identifier for this node.

Specified by:

getId in interface MemNode

Returns:

A numeric identifier for thisa node.

hashCode

public int hashCode()

Returns a hash-code value for this BlankNode. While the implementation is not defined, if there is a blank node identifier then it should be the hash code generated from this. Hash code generation should follow the normal contract.

Specified by:

hashCode in interface BlankNode

Returns:

a hash-code value for this blank node.

equals

public boolean equals(Object obj)

While the internal structure of a BlankNode is not defined equality between two nodes should be able to be determined.

Specified by:

equals in interface BlankNode

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the obj argument; false otherwise.

toString

public String toString()

Returns the String value of this BlankNode as: uid#id (eg. 29fbf7ba364f1425dda058737d764603#69)

Returns:

String

valueOf

public static BlankNode valueOf(String nodeString)
                         throws IllegalArgumentException

Parses a String in the format of: uid#id (eg. 29fbf7ba364f1425dda058737d764603#69) and creates a new BlankNodeImpl from it. Should only be applied to a value previously returned by toString()

Parameters:

nodeString - String previously returned by toString()

Returns:

BlankNodeImpl

Throws:

IllegalArgumentException