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kddml.Operators.IO.ExternalResourceWriter.ARFF_WRITER_RESOLVER Class Reference

Inheritance diagram for kddml.Operators.IO.ExternalResourceWriter.ARFF_WRITER_RESOLVER:

kddml.Operators.IO.ExternalResourceWriter.ExternalResourceWriterResolver kddml.Operators.IO.IOResolver kddml.Operators.OperatorResolver kddml.Operators.HWResourcesDescription List of all members.

Public Member Functions

KDDMLObject execute (Hashtable< String, KDDMLScalarManager > settings, Vector< KDDMLObject > arguments) throws ResolverException, KDDMLCoreException
kddml.Core.KDDMLObjectType getArgumentType (int i)
boolean highDiskAccessIsNeeded ()

Detailed Description

The operator accesses a relational table contained in the data repository, and it transforms the table into an ARFF file. The mapping from the data source to the logical types of the output ARFF format is automatic.
The operator returns KDDMLScalar, containing an integer representing the total number of table rows involved.

Title: KDDML

Description: Knowledge Discovery in Database Environment

Copyright: Copyright (c) 2003 - 2005

Company: Universita' di Pisa - Dipartimento di Informatica

Author:
Andrea Romei (romei@di.unipi.it)
Version:
2.0.16


Member Function Documentation

KDDMLObject kddml.Operators.IO.ExternalResourceWriter.ARFF_WRITER_RESOLVER.execute Hashtable< String, KDDMLScalarManager settings,
Vector< KDDMLObject arguments
throws ResolverException, KDDMLCoreException [virtual]
 

Returns the result of evaluating the operator over the passed arguments and attributes.
Attributes are given as hashtable, where the key is the name of the XML attribute related to the operator and the value is a KDDMLScalar object containing the attribute value. Attribute value is checked by the interpreter layer and it is correct.
Arguments are given as vector of KDDMLOjbect. Types of arguments are correct, as required by the getArgumentType(int i) method.
Implementations of the execute method can be distinguished according to the type of operator.

Parameters:
settings Hashtable the attributes related to the operator. The key of the hashtable is the name of the attribute. The value of the hashtable is a KDDMLScalar representing the value of the attribute.
arguments Vector the list of arguments as KDDMLObject.
Returns:
KDDMLObject the result of evaluating the operator.
Exceptions:
ResolverException if a resolving error occurs.
KDDMLCoreException if a level core error occurs.

Implements kddml.Operators.OperatorResolver.

kddml.Core.KDDMLObjectType kddml.Operators.IO.ExternalResourceWriter.ARFF_WRITER_RESOLVER.getArgumentType int  i  )  [virtual]
 

Returns the expected type of the i-th argument of the operator. Returns null if the operator do not admit argument as i-th child.

Parameters:
i int
Returns:
KDDMLObjectType

Implements kddml.Operators.OperatorResolver.

boolean kddml.Operators.IO.ExternalResourceWriter.ARFF_WRITER_RESOLVER.highDiskAccessIsNeeded  ) 
 

Returns true if the operator performes a high number of I/O operation to the hard disk.

Returns:
boolean

Reimplemented from kddml.Operators.OperatorResolver.


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