PredicateEvalExpression (Wavefront Shared Java Library 2020-08.2 API)

All Superinterfaces:

BaseExpression

All Known Implementing Classes:

MathExpression, MultiStringComparisonExpression, StringComparisonExpression
```
public interface PredicateEvalExpression
extends BaseExpression
```
An expression that returns a numeric value.

Author:

vasily@wavefront.com.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`static double`	`asDouble(boolean value)`	Helper method to convert a boolean value into a double.
`double`	`getValue(Object entity)`	Get a double value.
`static boolean`	`isTrue(double value)`	Helper method to convert a double value into a boolean.

- Method Detail
  - getValue
```
double getValue(Object entity)
```
    Get a double value.
    
    Parameters:
    
    entity - entity to get the value from.
    
    Returns:
    
    double value
  - isTrue
```
static boolean isTrue(double value)
```
    Helper method to convert a double value into a boolean.
    
    Parameters:
    
    value - value to evaluate
    
    Returns:
    
    true if value is close to 0 (within 1e-6)
  - asDouble
```
static double asDouble(boolean value)
```
    Helper method to convert a boolean value into a double.
    
    Parameters:
    
    value - value to evaluate
    
    Returns:
    
    1.0 for true, 0.0 for false.