void AddObserver ( nsIRDFObserver observer )

Add an observer to this data source. If the datasource supports observers, the datasource source should hold a strong reference to the observer.

Arguments:

observer

nsISimpleEnumerator ArcLabelsIn ( nsIRDFNode node )

Get a cursor to iterate over all the arcs that point into a node.

Arguments:

node

Returns:

nsISimpleEnumerator object.

nsISimpleEnumerator ArcLabelsOut ( nsIRDFResource source )

Get a cursor to iterate over all the arcs that originate in a resource.

Arguments:

source

Returns:

nsISimpleEnumerator object.

void Assert ( nsIRDFResource source , nsIRDFResource property , nsIRDFNode target , PRBool truthValue )

Add an assertion to the graph.

Arguments:

source

property

target

truthValue

void beginUpdateBatch ( )

Notify observers that the datasource is about to send several notifications at once. This must be followed by calling endUpdateBatch(), otherwise viewers will get out of sync.

void Change ( nsIRDFResource source , nsIRDFResource property , nsIRDFNode oldTarget , nsIRDFNode newTarget )

Change an assertion from

[source]--[property]-->[oldTarget]

To

[source]--[property]-->[newTarget]

Arguments:

source

property

oldTarget

newTarget

void DoCommand ( nsISupportsArray sources , nsIRDFResource command , nsISupportsArray arguments )

Perform the specified command on set of sources.

Arguments:

sources

command

arguments

void endUpdateBatch ( )

Notify observers that the datasource has completed issuing a notification group.

nsISimpleEnumerator GetAllCmds ( nsIRDFResource source )

Returns the set of all commands defined for a given source.

Arguments:

source

nsISimpleEnumerator GetAllResources ( )

Retrieve all of the resources that the data source currently refers to.

nsIRDFResource GetSource ( nsIRDFResource property , nsIRDFNode target , PRBool truthValue )

Find an RDF resource that points to a given node over the specified arc & truth value

Arguments:

property

target

truthValue

Returns:

NS_RDF_NO_VALUE if there is no source that leads to the target with the specified property.

nsISimpleEnumerator GetSources ( nsIRDFResource property , nsIRDFNode target , PRBool truthValue )

Find all RDF resources that point to a given node over the specified arc & truth value

Arguments:

property

target

truthValue

Returns:

nsISimpleEnumerator points

nsIRDFNode GetTarget ( nsIRDFResource source , nsIRDFResource property , PRBool truthValue )

Find a child of that is related to the source by the given arc arc and truth value

Arguments:

source

property

truthValue

Returns:

NS_RDF_NO_VALUE if there is no target accessible from the source via the specified property.

nsISimpleEnumerator GetTargets ( nsIRDFResource source , nsIRDFResource property , PRBool truthValue )

Find all children of that are related to the source by the given arc arc and truth value.

Arguments:

source

property

truthValue

Returns:

nsISimpleEnumerator points

PRBool hasArcIn ( nsIRDFNode node , nsIRDFResource arc )

Returns true if the specified node is pointed to by the specified arc. Equivalent to enumerating ArcLabelsIn and comparing for the specified arc.

Arguments:

node

arc

PRBool hasArcOut ( nsIRDFResource source , nsIRDFResource arc )

Returns true if the specified node has the specified outward arc. Equivalent to enumerating ArcLabelsOut and comparing for the specified arc.

Arguments:

source

arc

PRBool HasAssertion ( nsIRDFResource source , nsIRDFResource property , nsIRDFNode target , PRBool truthValue )

Query whether an assertion exists in this graph.

Arguments:

source

property

target

truthValue

PRBool IsCommandEnabled ( nsISupportsArray sources , nsIRDFResource command , nsISupportsArray arguments )

Returns whether a given command is enabled for a set of sources.

Arguments:

sources

command

arguments

void Move ( nsIRDFResource oldSource , nsIRDFResource newSource , nsIRDFResource property , nsIRDFNode target )

'Move' an assertion from

[oldSource]--[property]-->[target]

To

[newSource]--[property]-->[target]

Arguments:

oldSource

newSource

property

target

void RemoveObserver ( nsIRDFObserver observer )

Remove an observer from this data source.

Arguments:

observer

void Unassert ( nsIRDFResource source , nsIRDFResource property , nsIRDFNode target )

Remove an assertion from the graph.

Arguments:

source

property

target