EnsuresQualifierIf (checker-framework 3.39.0-eisop1 API)

```
@Documented
@Retention(RUNTIME)
@Target(METHOD)
@InheritedAnnotation
@Repeatable(List.class)
public @interface EnsuresQualifierIf
```
A conditional postcondition annotation to indicate that a method ensures that certain expressions have a certain qualifier once the method has terminated, and if the result is as indicated by result. The expressions for which the qualifier holds after the method's execution are indicated by expression and are specified using a string. The qualifier is specified by the qualifier annotation element.
Here is an example use:
```
   @EnsuresQualifierIf(result = true, expression = "#1", qualifier = Odd.class)
    boolean isOdd(int p1, int p2) {
        return p1 % 2 == 1;
    }
 
```
This annotation is only applicable to methods with a boolean return type.
Some type systems have specialized versions of this annotation, such as org.checkerframework.checker.nullness.qual.EnsuresNonNullIf and org.checkerframework.checker.lock.qual.EnsuresLockHeldIf.
See Also:

EnsuresQualifier

See the Checker Framework Manual:
Syntax of Java expressions

Required Element Summary

Required Elements
Modifier and Type	Required Element	Description
`java.lang.String[]`	`expression`	Returns the Java expressions for which the qualifier holds if the method terminates with return value `result()`.
`java.lang.Class<? extends java.lang.annotation.Annotation>`	`qualifier`	Returns the qualifier that is guaranteed to hold if the method terminates with return value `result()`.
`boolean`	`result`	Returns the return value of the method that needs to hold for the postcondition to hold.

- Element Detail
  - expression
```
java.lang.String[] expression
```
    Returns the Java expressions for which the qualifier holds if the method terminates with return value result().
    
    Returns:
    
    the Java expressions for which the qualifier holds if the method terminates with return value result()
    
    See the Checker Framework Manual:
    Syntax of Java expressions
- - qualifier
```
java.lang.Class<? extends java.lang.annotation.Annotation> qualifier
```
    Returns the qualifier that is guaranteed to hold if the method terminates with return value result().
    
    Returns:
    
    the qualifier that is guaranteed to hold if the method terminates with return value result()
- - result
```
boolean result
```
    Returns the return value of the method that needs to hold for the postcondition to hold.
    
    Returns:
    
    the return value of the method that needs to hold for the postcondition to hold