org.gvsig.expressionevaluator.spi

Class BaseExpressionEvaluator

java.lang.Object

org.gvsig.tools.evaluator.AbstractEvaluator

org.gvsig.expressionevaluator.spi.BaseExpressionEvaluator

All Implemented Interfaces:

java.lang.Cloneable, ExpressionEvaluator, SupportToExpression, SupportToSymbolTable, SupportFromJson, SupportJson, SupportToJson, Evaluator, EvaluatorWithDescriptions, Persistent

public class BaseExpressionEvaluator
extends AbstractEvaluator
implements ExpressionEvaluator, Cloneable, SupportToExpression, SupportToSymbolTable

Nested Class Summary

Nested classes/interfaces inherited from interface org.gvsig.tools.evaluator.EvaluatorWithDescriptions

EvaluatorWithDescriptions.Description

Constructor Summary

Constructors

Constructor and Description
BaseExpressionEvaluator(Expression expression)
BaseExpressionEvaluator(java.lang.String source)

Method Summary

Modifier and Type	Method and Description
void	addSymbolTable(SymbolTable symbolTable)
Evaluator	clone() Creates a copy of the object.
java.lang.Object	evaluate(EvaluatorData data) Evaluate with the data passed as parameter.
void	fromJson(JsonObject json)
EvaluatorWithDescriptions.Description[]	getAvailableFunctions()
EvaluatorWithDescriptions.Description[]	getAvailableOperators()
java.lang.String	getDescription() Get a description of the action performed with the evaluator.
EvaluatorFieldsInfo	getFieldsInfo() Get information about fiels used in the evaluator.
java.lang.String	getName() Get the symbolic name of the evaluator.
java.lang.String	getSQL() Get a SQL representation of the evaluator.
void	loadFromState(PersistentState state) Set the state of the object from the state passed as parameter.
static void	registerPersistence()
void	saveToState(PersistentState state) Saves the internal state of the object on the provided PersistentState object.
Expression	toExpression()
JsonObjectBuilder	toJsonBuilder()
SymbolTable	toSymbolTable()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.gvsig.json.SupportToJson

toJson, toJson, toJsonBuilder

Methods inherited from interface org.gvsig.tools.lang.Cloneable

cloneQuietly, cloneQuietly

Constructor Detail

BaseExpressionEvaluator

public BaseExpressionEvaluator(java.lang.String source)

BaseExpressionEvaluator

public BaseExpressionEvaluator(Expression expression)

Method Detail

getName

public java.lang.String getName()

Description copied from interface: Evaluator

Get the symbolic name of the evaluator.

Specified by:

getName in interface Evaluator

Returns:

evaluator's name

getDescription

public java.lang.String getDescription()

Description copied from interface: Evaluator

Get a description of the action performed with the evaluator.

Specified by:

getDescription in interface Evaluator

Overrides:

getDescription in class AbstractEvaluator

Returns:

evaluator's description

getSQL

public java.lang.String getSQL()

Description copied from interface: Evaluator

Get a SQL representation of the evaluator.

Specified by:

getSQL in interface ExpressionEvaluator

Specified by:

getSQL in interface Evaluator

Overrides:

getSQL in class AbstractEvaluator

Returns:

the SQL string or null if not supported.

toExpression

public Expression toExpression()

Specified by:

toExpression in interface SupportToExpression

toSymbolTable

public SymbolTable toSymbolTable()

Specified by:

toSymbolTable in interface SupportToSymbolTable

evaluate

public java.lang.Object evaluate(EvaluatorData data)
                          throws EvaluatorException

Description copied from interface: Evaluator

Evaluate with the data passed as parameter.

Specified by:

evaluate in interface Evaluator

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.

getFieldsInfo

public EvaluatorFieldsInfo getFieldsInfo()

Description copied from interface: Evaluator

Get information about fiels used in the evaluator.

Specified by:

getFieldsInfo in interface Evaluator

Overrides:

getFieldsInfo in class AbstractEvaluator

Returns:

getAvailableOperators

public EvaluatorWithDescriptions.Description[] getAvailableOperators()

Specified by:

getAvailableOperators in interface EvaluatorWithDescriptions

getAvailableFunctions

public EvaluatorWithDescriptions.Description[] getAvailableFunctions()

Specified by:

getAvailableFunctions in interface EvaluatorWithDescriptions

clone

public Evaluator clone()
                throws java.lang.CloneNotSupportedException

Description copied from interface: Cloneable

Creates a copy of the object.

Overrides:

clone in class java.lang.Object

Returns:

a copy of the object

Throws:

java.lang.CloneNotSupportedException - if the instance of the object cannot be cloned. As this is extending Cloneable so its sure it implements it, so this exception may be used for problems on specific object instances.

See Also:

Object#clone()}.

saveToState

public void saveToState(PersistentState state)
                 throws PersistenceException

Description copied from interface: Persistent

Saves the internal state of the object on the provided PersistentState object.

Specified by:

saveToState in interface Persistent

Throws:

PersistenceException

loadFromState

public void loadFromState(PersistentState state)
                   throws PersistenceException

Description copied from interface: Persistent

Set the state of the object from the state passed as parameter.

Specified by:

loadFromState in interface Persistent

Throws:

PersistenceException

registerPersistence

public static void registerPersistence()

addSymbolTable

public void addSymbolTable(SymbolTable symbolTable)

Specified by:

addSymbolTable in interface ExpressionEvaluator

fromJson

public void fromJson(JsonObject json)

Specified by:

fromJson in interface SupportFromJson

toJsonBuilder

public JsonObjectBuilder toJsonBuilder()

Specified by:

toJsonBuilder in interface SupportToJson