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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();
}