org.checkerframework.checker.lock.qual.EnsuresLockHeldIf Maven / Gradle / Ivy

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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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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.ConditionalPostconditionAnnotation;
import org.checkerframework.framework.qual.InheritedAnnotation;

/**
 * Indicates that the given expressions are held if the method terminates successfully and returns
 * the given result (either true or false).
 *
 * @see EnsuresLockHeld
 * @checker_framework.manual #lock-checker Lock Checker
 * @checker_framework.manual #ensureslockheld-examples Example use of @EnsuresLockHeldIf
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
@ConditionalPostconditionAnnotation(qualifier = LockHeld.class)
@InheritedAnnotation
@Repeatable(EnsuresLockHeldIf.List.class)
public @interface EnsuresLockHeldIf {
  /**
   * Returns Java expressions whose values are locks that are held after the method returns the
   * given result.
   *
   * @return Java expressions whose values are locks that are held after the method returns the
   *     given result
   * @see Syntax of
   *     Java expressions
   */
  // It would be clearer for users if this field were named "lock".
  // However, method ContractsFromMethod.getConditionalPostconditions in the CF implementation
  // assumes that conditional postconditions have a field named "expression".
  String[] expression();

  /**
   * Returns the return value of the method under which the postconditions hold.
   *
   * @return the return value of the method under which the postconditions hold
   */
  boolean result();

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