Package org.apache.derby.impl.sql

Class GenericLanguageFactory

java.lang.Object

org.apache.derby.impl.sql.GenericLanguageFactory

All Implemented Interfaces:

ModuleControl, LanguageFactory

public class GenericLanguageFactory
extends java.lang.Object
implements LanguageFactory, ModuleControl

The LanguageFactory provides system-wide services that are available on the Database API.

Field Summary

Fields

Modifier and Type	Field	Description
private GenericParameterValueSet	emptySet

Fields inherited from interface org.apache.derby.iapi.sql.LanguageFactory

MODULE

Constructor Summary

Constructors

Constructor	Description
GenericLanguageFactory()

Method Summary

Modifier and Type	Method	Description
void	boot(boolean create, java.util.Properties startParams)	Start-up method for this instance of the language factory.
private static java.lang.Object	findServiceModule(java.lang.Object serviceModule, java.lang.String factoryInterface)	Privileged startup.
ResultDescription	getResultDescription(ResultColumnDescriptor[] cols, java.lang.String type)	Get a new result description
ResultDescription	getResultDescription(ResultDescription inputResultDescription, int[] theCols)	Get a new result description from the input result description.
ParameterValueSet	newParameterValueSet(ClassInspector ci, int numParms, boolean hasReturnParam)	Factory method for getting a ParameterValueSet
void	stop()	Stop this module.

Methods inherited from class java.lang.Object

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

Field Detail

emptySet

private GenericParameterValueSet emptySet

Constructor Detail

GenericLanguageFactory

public GenericLanguageFactory()

Method Detail

boot

public void boot(boolean create,
                 java.util.Properties startParams)
          throws StandardException

Start-up method for this instance of the language factory. This service is expected to be started and accessed relative to a database.

Specified by:

boot in interface ModuleControl

Parameters:

startParams - The start-up parameters (ignored in this case)

Throws:

StandardException - Thrown if module cannot be booted.

See Also:

Monitor, ModuleFactory

stop

public void stop()

Stop this module. In this case, nothing needs to be done.

Specified by:

stop in interface ModuleControl

See Also:

Monitor, ModuleFactory

newParameterValueSet

public ParameterValueSet newParameterValueSet(ClassInspector ci,
                                              int numParms,
                                              boolean hasReturnParam)

Factory method for getting a ParameterValueSet

Specified by:

newParameterValueSet in interface LanguageFactory

numParms - The number of parameters in the ParameterValueSet

hasReturnParam - true if this parameter set has a return parameter. The return parameter is always the 1st parameter in the list. It is due to a callableStatement like this: ? = CALL myMethod()

Returns:

A new ParameterValueSet with the given number of parms

See Also:

LanguageFactory.newParameterValueSet(org.apache.derby.iapi.services.loader.ClassInspector, int, boolean)

getResultDescription

public ResultDescription getResultDescription(ResultDescription inputResultDescription,
                                              int[] theCols)

Get a new result description from the input result description. Picks only the columns in the column array from the inputResultDescription.

Specified by:

getResultDescription in interface LanguageFactory

Parameters:

inputResultDescription - the input rd

theCols - array of ints, non null

Returns:

ResultDescription the rd

getResultDescription

public ResultDescription getResultDescription(ResultColumnDescriptor[] cols,
                                              java.lang.String type)

Get a new result description

Specified by:

getResultDescription in interface LanguageFactory

Parameters:

cols - an array of col descriptors

type - the statement type

Returns:

ResultDescription the rd

findServiceModule

private static java.lang.Object findServiceModule(java.lang.Object serviceModule,
                                                  java.lang.String factoryInterface)
                                           throws StandardException

Privileged startup. Must be private so that user code can't call this entry point.

Throws:

StandardException