WbExpression (OpenRefine 4.0-SNAPSHOT API)

All Known Implementing Classes:

WbDateConstant, WbDateVariable, WbEntityIdValueConstant, WbEntityVariable, WbItemConstant, WbItemEditExpr, WbItemVariable, WbLanguageConstant, WbLanguageVariable, WbLocationConstant, WbLocationVariable, WbMediaInfoEditExpr, WbMonolingualExpr, WbPropConstant, WbQuantityExpr, WbReferenceExpr, WbSnakExpr, WbStringConstant, WbStringVariable, WbVariableExpr
```
public interface WbExpression<T>
```
The base interface for all expressions, which evaluate to a particular type T in an ExpressionContext.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`T`	`evaluate(ExpressionContext ctxt)`	Evaluates the value expression in a given context, returns a Wikibase value suitable to be the target of a claim.
`void`	`validate(ValidationState validation)`	Check that this expression is fully formed and ready to be evaluated.

- Method Detail
  - evaluate
```
T evaluate(ExpressionContext ctxt)
    throws SkipSchemaExpressionException,
           QAWarningException,
           SpecialValueNoValueException,
           SpecialValueSomeValueException
```
    Evaluates the value expression in a given context, returns a Wikibase value suitable to be the target of a claim. As a premise to calling that method, we assume that calling validate(ValidationState) did not log any error in the validation state.
    
    Throws:
    
    SkipSchemaExpressionException
    
    QAWarningException
    
    SpecialValueNoValueException
    
    SpecialValueSomeValueException
  - validate
```
void validate(ValidationState validation)
```
    Check that this expression is fully formed and ready to be evaluated.
    
    Parameters:
    
    validation - the state in which to log any validation errors