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package org.checkerframework.checker.nullness.qual;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.checkerframework.framework.qual.InheritedAnnotation;
import org.checkerframework.framework.qual.JavaExpression;
import org.checkerframework.framework.qual.PostconditionAnnotation;
import org.checkerframework.framework.qual.QualifierArgument;
/**
* Indicates that the value expressions evaluate to a value that is a key in all the given maps, if
* the method terminates successfully.
*
* Consider the following method from {@code java.util.Map}:
*
*
* @EnsuresKeyFor(value="key", map="this")
* public @Nullable V put(K key, V value) { ... }
*
*
* This method guarantees that {@code key} has type {@code @KeyFor("this")} after the method
* returns.
*
* @see KeyFor
* @see EnsuresKeyForIf
* @checker_framework.manual #map-key-checker Map Key Checker
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
@PostconditionAnnotation(qualifier = KeyFor.class)
@InheritedAnnotation
public @interface EnsuresKeyFor {
/**
* Java expressions that are keys in the given maps on successful method termination.
*
* @checker_framework.manual #java-expressions-as-arguments Syntax of Java expressions
*/
String[] value();
/**
* Java expressions that are maps, each of which contains each of the expressions' value on
* successful method termination.
*
* @checker_framework.manual #java-expressions-as-arguments Syntax of Java expressions
*/
@JavaExpression
@QualifierArgument("value")
String[] map();
}