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package org.checkerframework.checker.lock.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;

/**
 * Indicates that the given expressions are held if the method terminates successfully.
 *
 * @see EnsuresLockHeldIf
 * @checker_framework.manual #lock-checker Lock Checker
 * @checker_framework.manual #ensureslockheld-examples Example use of @EnsuresLockHeld
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
@PostconditionAnnotation(qualifier = LockHeld.class)
@InheritedAnnotation
@Repeatable(EnsuresLockHeld.List.class)
public @interface EnsuresLockHeld {
  /**
   * Returns Java expressions whose values are locks that are held after successful method
   * termination.
   *
   * @return Java expressions whose values are locks that are held after successful method
   *     termination
   * @see Syntax of
   *     Java expressions
   */
  String[] value();

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