ExistsExpression (Blueriq SDK Modules 13.13.58.6656 API)

java.lang.Object
- com.aquima.interactions.expressions.optimizer.nodes.ExistsExpression

All Implemented Interfaces:

IExpressionNode, Serializable
```
public class ExistsExpression
extends Object
implements IExpressionNode
```
The exists expression can be used to check if at least one of the selected values matches the condition.

Since:

6.4

Author:

O. Kerpershoek

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor	Description
`ExistsExpression(IExpressionNode fromExpr, Identifier alias, IExpressionNode whereExpr)`	Constructs the exists expression with the required arguments.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`IValue`	`evaluate(IValueEnvironment environment)`	This method evaluates the node using the environment passed as argument and returns the result as a value or null if the result is unknown.
`protected Identifier`	`getAlias()`
`protected IExpressionNode`	`getFromExpr()`
`protected IExpressionNode`	`getWhereExpr()`
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - ExistsExpression
```
public ExistsExpression(IExpressionNode fromExpr,
                        Identifier alias,
                        IExpressionNode whereExpr)
```
    Constructs the exists expression with the required arguments.
    
    Parameters:
    
    fromExpr - The expression that should be used to retrieve the values.
    
    alias - The alias that is used for the values.
    
    whereExpr - The condition that should be evaluated for each value.
- Method Detail
  - getAlias
```
protected Identifier getAlias()
```
  - getFromExpr
```
protected IExpressionNode getFromExpr()
```
  - getWhereExpr
```
protected IExpressionNode getWhereExpr()
```
  - evaluate
```
public IValue evaluate(IValueEnvironment environment)
```
    Description copied from interface: IExpressionNode
    
    This method evaluates the node using the environment passed as argument and returns the result as a value or null if the result is unknown.
    
    Specified by:
    
    evaluate in interface IExpressionNode
    
    Parameters:
    
    environment - The environment that should be used when evaluating the node.
    
    Returns:
    
    The result of the evaluation, or null if the result is unknown.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object