com.franz.ag
Class DefaultGraph

java.lang.Object
  com.franz.ag.ValueObject
      com.franz.ag.ValueNode
          com.franz.ag.ResourceNode
              com.franz.ag.DefaultGraph

All Implemented Interfaces:

java.lang.Comparable, Resource, java.io.Serializable, Value

public class DefaultGraph

extends ResourceNode

Instances of this class represent the marker that identifies the default graph, or the null context, of a triple store.

The label of any DefaultGraph is the string "default graph". The toString() method returns a string that is different for different triple stores.

Instances are created by the system as needed to represent the triples returned from the store. There are no public constructors and no methods to create instances from an application. When the default graph is mentioned in a method call, it should be mentioned with a null argument or the empty string, as specified in the method description. In general, it is not advisable for applications to manipulate DefaultGraph instances in any way.

See the note in the description of AllegroGraphConnection.federate(String, AllegroGraph[], boolean) for additional issues about default graphs.

It is likely (but not guaranteed) that two instances representing the default graph of the same store will be identical. They will necessarily return true from equals().

See Also:

Serialized Form

Method Summary

java.lang.String

toString() This method provides a string representation of the instance as the string

Methods inherited from class com.franz.ag.ResourceNode

addProperty, getSubjectStatements

Methods inherited from class com.franz.ag.ValueNode

compareTo, getObjectStatements, queryAGId

Methods inherited from class com.franz.ag.ValueObject

compareTo

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.openrdf.model.Value

getObjectStatements

Methods inherited from interface java.lang.Comparable

compareTo

Method Detail

toString

public java.lang.String toString()

This method provides a string representation of the instance as the string

<DefaultGraph aaa bbbbbb>

where aaa is the triple store index (shown in the string form of the AllegroGraph instance), and bbbbbb is a hexadecimal string that identifies the instance uniquely.