Statement (VTL Engine 1.0.8 API)

All Known Subinterfaces:

NamedOperator
```
public interface Statement
```
Interface that represents a single VTL rule.

Author:

Valentino Pinna

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`VTLValue`	`eval(TransformationScheme scheme)`	Computes this statement in the context of the provided scheme and returns the result.
`String`	`getId()`
`Lineage`	`getLineage()`	If available returns the lineage for this statement
`VTLValueMetadata`	`getMetadata(TransformationScheme scheme)`	Computes the metadata of the rule in the context of a Transformation Scheme.
`Set<LeafTransformation>`	`getTerminals()`
`boolean`	`isCacheable()`

- Method Detail
  - getId
```
String getId()
```
    Returns:
    
    The id of the statement, like the rule name at the left side of an assignment statement.
  - getMetadata
```
VTLValueMetadata getMetadata(TransformationScheme scheme)
```
    Computes the metadata of the rule in the context of a Transformation Scheme.
    
    Parameters:
    
    scheme - The transformation scheme
    
    Returns:
    
    The metadata for this Statement
  - eval
```
VTLValue eval(TransformationScheme scheme)
```
    Computes this statement in the context of the provided scheme and returns the result.
    
    Parameters:
    
    scheme - the context scheme
    
    Returns:
    
    the result of the computation.
  - getTerminals
```
Set<LeafTransformation> getTerminals()
```
    Returns:
    
    a list of primitive nodes, such as aliases or constants, on which this statement depends on
  - isCacheable
```
boolean isCacheable()
```
    Returns:
    
    true if it makes sense to cache the result of evaluating this statement.
  - getLineage
```
Lineage getLineage()
```
    If available returns the lineage for this statement
    
    Returns:
    
    the lineage if any