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nl.aidministrator.rdf.sail.sql92.iterators
Class SQL92ValueIterator  

java.lang.Object
  nl.aidministrator.rdf.sail.sql92.iterators.SQL92ValueIterator

All Implemented Interfaces:

nl.aidministrator.rdf.sail.ValueIterator

Direct Known Subclasses:

SQL92LiteralIterator, SQL92ResourceIterator

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public abstract class SQL92ValueIterator

extends java.lang.Object

implements nl.aidministrator.rdf.sail.ValueIterator

A ResourceIterator that executes an SQL query. SQL92ValueIterator is an abstract class, no instances of SQL92ValueIterator can be created. A subclass of SQL92ValueIterator is defined that either iterates rdfs:Resources or rdfs:Literals. This subclass must implement getResult(), the implementation of getResult() must call the proper contructor of either rdfs:Resource or rdfs:Literal.

Version:

1.1, 01/17/02

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Field Summary
protected  java.sql.Connection	_databaseCon           Connection to the database.
protected  boolean	_hasNext           Flag indicating whether there are any more results.
protected  java.lang.String	_query           Query to execute.
protected  java.sql.ResultSet	_resultSet           ResultSet for the query.
protected  java.sql.Statement	_statement           SQL statement that was used to generate the ResultSet.

 

Constructor Summary

SQL92ValueIterator(java.sql.Connection databaseCon, java.lang.String query)           Constructor.

 

Method Summary
private  void	_execQuery()
void	close()           Closes the iterator and frees any resources that it uses (e.g.
protected  void	finalize()           Called by the garbage collector on SQL92ValueIterator when garbage collection determines that there are no more references to the SQL92ValueIterator.
protected abstract  nl.aidministrator.rdf.sail.model.Value	getResult()           Gets the result from the ResultSet.
boolean	hasNext()           Checks whether there are any more values available.
nl.aidministrator.rdf.sail.model.Value	next()           Gets the next value.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

_resultSet

protected java.sql.ResultSet _resultSet

ResultSet for the query.

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_statement

protected java.sql.Statement _statement

SQL statement that was used to generate the ResultSet. It cannot be closed until all results have been read from the ResultSet.

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_databaseCon

protected java.sql.Connection _databaseCon

Connection to the database.

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_query

protected java.lang.String _query

Query to execute.

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_hasNext

protected boolean _hasNext

Flag indicating whether there are any more results.

Constructor Detail

SQL92ValueIterator

public SQL92ValueIterator(java.sql.Connection databaseCon,
                          java.lang.String query)

Constructor.

Method Detail

_execQuery

private void _execQuery()

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hasNext

public boolean hasNext()

Description copied from interface: nl.aidministrator.rdf.sail.ValueIterator

Checks whether there are any more values available.

Specified by:

hasNext in interface nl.aidministrator.rdf.sail.ValueIterator

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next

public nl.aidministrator.rdf.sail.model.Value next()

Description copied from interface: nl.aidministrator.rdf.sail.ValueIterator

Gets the next value.

Specified by:

next in interface nl.aidministrator.rdf.sail.ValueIterator

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close

public void close()

Description copied from interface: nl.aidministrator.rdf.sail.ValueIterator

Closes the iterator and frees any resources that it uses (e.g. connections to databases). Every ValueIterator should be properly closed when it has returned all of its values, or when it is no longer needed.

Specified by:

close in interface nl.aidministrator.rdf.sail.ValueIterator

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finalize

protected void finalize()

Called by the garbage collector on SQL92ValueIterator when garbage collection determines that there are no more references to the SQL92ValueIterator.

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getResult

protected abstract nl.aidministrator.rdf.sail.model.Value getResult()

Gets the result from the ResultSet. Must be implemented by SQL92ResourceIterator or SQL92LiteralIterator in order to call the proper constructor of either Resource or Literal.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> nl >> aidministrator >> rdf >> sail >> sql92 >> [ iterators overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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