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package org.checkerframework.common.initializedfields.qual;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Repeatable;
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.PostconditionAnnotation;
import org.checkerframework.framework.qual.QualifierArgument;

/**
 * A method postcondition annotation indicates which fields the method definitely initializes.
 *
 * @checker_framework.manual #initialized-fields-checker Initialized Fields Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
@PostconditionAnnotation(qualifier = InitializedFields.class)
@InheritedAnnotation
@Repeatable(EnsuresInitializedFields.List.class)
public @interface EnsuresInitializedFields {
    /**
     * The object whose fields this method initializes.
     *
     * @return object whose fields are initialized
     */
    public String value() default "this";

    /**
     * Fields that this method initializes.
     *
     * @return fields that this method initializes
     */
    @QualifierArgument("value")
    public String[] fields();

    /**
     * A wrapper annotation that makes the {@link EnsuresInitializedFields} annotation repeatable.
     *
     * Programmers generally do not need to write this. It is created by Java when a programmer
     * writes more than one {@link EnsuresInitializedFields} annotation at the same location.
     */
    @Documented
    @Retention(RetentionPolicy.RUNTIME)
    @Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
    @PostconditionAnnotation(qualifier = InitializedFields.class)
    @InheritedAnnotation
    @interface List {
        /**
         * Return the repeatable annotations.
         *
         * @return the repeatable annotations
         */
        EnsuresInitializedFields[] value();
    }
}