RecursiveSQLResourceIterator

Overview

Package

Class

Use

Deprecated

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nl.aidministrator.rdf.ral.rdbms
Class RecursiveSQLResourceIterator

java.lang.Object
  nl.aidministrator.rdf.ral.rdbms.RecursiveSQLResourceIterator

All Implemented Interfaces:: nl.aidministrator.rdf.ral.ResourceIterator

public class RecursiveSQLResourceIterator
extends java.lang.Object
implements nl.aidministrator.rdf.ral.ResourceIterator

A ResourceIterator that executes SQL queries recursively by re-inserting part of the query's results into the query. The query should contain EXACTLY ONE IN-parameter (i.e. there is one '?' in the query) and the ResultSet should contain the following columns: id (int), namespace (String) and localname (String). The first value (the id) will be re-inserted into the query.

Version:: 1.4, 01/02/02

Field Summary

protected java.sql.Connection _databaseCon
          Connection to the database.

protected java.util.Set _iterated
          Stores Resources that have already been iterated.

protected java.util.Vector _resultsQueue
          Queue containing the results.

protected java.sql.PreparedStatement _statement
          The query in the form of a PreparedStatement.

Constructor Summary

RecursiveSQLResourceIterator(java.sql.Connection databaseCon, java.lang.String query, IdResource initialResource)
          Constructor.

Method Summary

private void _add(nl.aidministrator.rdf.sail.model.Resource resource)


private void _fillQueue(int value)


void close()
          Closes all connections to the repository.

protected void finalize()
          Called by the garbage collector on SQLValueIterator when garbage collection determines that there are no more references to the SQLValueIterator.

boolean hasNext()
          Checks whether there are any more results available.

nl.aidministrator.rdf.sail.model.Value next()
          Gets the next result.

Methods inherited from class java.lang.Object

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

Field Detail

_databaseCon

protected java.sql.Connection _databaseCon

Connection to the database.

_statement

protected java.sql.PreparedStatement _statement

The query in the form of a PreparedStatement.

_resultsQueue

protected java.util.Vector _resultsQueue

Queue containing the results.

_iterated

protected java.util.Set _iterated

Stores Resources that have already been iterated. This prevents looping of the iterator and therefore supports multiple inheritance and loops in the class or property hierarchy.

Constructor Detail