org.deegree.io.datastore.sql.transaction.delete
Class TableGraph

java.lang.Object
  org.deegree.io.datastore.sql.transaction.delete.TableGraph

 class TableGraph
extends Object

Represents a delete operation on the relational (table) level. Contains explicit information on all table rows to be removed from the database and their foreign key references.

Version:

$Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $

Author:

Markus Schneider, last edited by: $Author: mschneider $

See Also:

FeatureGraph

Constructor Summary

TableGraph(FeatureGraph featureGraph, DeleteHandler handler)
Creates a new DeleteGraph instance from the given FeatureGraph.

Method Summary

(package private) TableNode	findNode(FeatureId fid) Returns the TableNode that represents the specified feature instance.
(package private) TableNode	findNode(TableNode newNode) Returns the TableNode that represents the specified feature instance (given as a TableNode).
(package private) int	getDeletableRootFeatureCount() Returns the number of deletable root features.
(package private) List<TableNode>	getDeletionOrder() Returns the nodes of the graph in topological order, i.e. they may be deleted in that order without violating any foreign key constraints.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

TableGraph

TableGraph(FeatureGraph featureGraph,
           DeleteHandler handler)
     throws DatastoreException

Creates a new DeleteGraph instance from the given FeatureGraph.

Parameters:

featureGraph -

handler -

Throws:

DatastoreException

Method Detail

getDeletableRootFeatureCount

int getDeletableRootFeatureCount()

Returns the number of deletable root features.

Returns:

number of deletable root features.

findNode

TableNode findNode(FeatureId fid)

Returns the TableNode that represents the specified feature instance.

Parameters:

fid - FeatureId of the feature instance

Returns:

TableNode for the feature instance if it exists in the graph, null otherwise

findNode

TableNode findNode(TableNode newNode)

Returns the TableNode that represents the specified feature instance (given as a TableNode).

Parameters:

newNode - feature to look up

Returns:

TableNode for the feature instance if it exists in the graph, null otherwise

getDeletionOrder

List<TableNode> getDeletionOrder()

Returns the nodes of the graph in topological order, i.e. they may be deleted in that order without violating any foreign key constraints.

NOTE: If the foreign key constraints constitute a cycle, no topological order is possible and the initial order (arbitrary) is returned.

Returns:

the nodes of the graph in topological order if no cycle is present, else in arbitrary order

toString

public String toString()

Overrides:

toString in class Object