org.gvsig.tools.evaluator

Interface Evaluator

All Known Subinterfaces:

EvaluatorWithDescriptions, ExpressionEvaluator

All Known Implementing Classes:

AbstractEvaluator, AndEvaluator, ContainsEnvelopeEvaluator, ContainsGeometryEvaluator, CrossEnvelopeEvaluator, CrossesGeometryEvaluator, DefaultExpressionEvaluator, DisjointGeometryEvaluator, EqualsGeometryEvaluator, IntersectsEnvelopeEvaluator, IntersectsGeometryEvaluator, IntersectsTimeEvaluator, OutGeometryEvaluator, OverlapsGeometryEvaluator, SQLJEPEvaluator, TouchesGeometryEvaluator, WithinGeometryEvaluator

public interface Evaluator

This interface provides the necessary methods for processing CQL expressions.

Method Summary

Modifier and Type	Method and Description
Object	evaluate(EvaluatorData data) Evaluate with the data passed as parameter.
String	getDescription() Get a description of the action performed with the evaluator.
EvaluatorFieldsInfo	getFieldsInfo() Get information about fiels used in the evaluator.
String	getName() Get the symbolic name of the evaluator.
String	getSQL() Get a SQL representation of the evaluator.

Method Detail

evaluate

Object evaluate(EvaluatorData data)
         throws EvaluatorException

Evaluate with the data passed as parameter.

Parameters:

data -

Returns:

the result of the evaluation.

Throws:

EvaluatorException - if an issue is found while evaluating. The subclass EvaluatorParseException is used to indicate a problem while parsing (malformed expression) rather than a problem while evaluating.

getName

String getName()

Get the symbolic name of the evaluator.

Returns:

evaluator's name

getDescription

String getDescription()

Get a description of the action performed with the evaluator.

Returns:

evaluator's description

getSQL

String getSQL()

Get a SQL representation of the evaluator.

Returns:

the SQL string or null if not supported.

getFieldsInfo

EvaluatorFieldsInfo getFieldsInfo()

Get information about fiels used in the evaluator.

Returns: