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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.calledmethods.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;
import org.checkerframework.framework.qual.QualifierArgument;

/**
 * Indicates that the method, if it terminates with the given result, invokes the given methods on
 * the given expressions.
 *
 * @see EnsuresCalledMethods
 * @see CalledMethods
 * @checker_framework.manual #called-methods-checker Called Methods Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
@ConditionalPostconditionAnnotation(qualifier = CalledMethods.class)
@InheritedAnnotation
@Repeatable(EnsuresCalledMethodsIf.List.class)
public @interface EnsuresCalledMethodsIf {
  /**
   * Returns Java expressions that have had the given methods called on them after the method
   * returns {@link #result}.
   *
   * @return an array of Java expressions
   * @checker_framework.manual #java-expressions-as-arguments Syntax of Java expressions
   */
  String[] expression();

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

  /**
   * The methods guaranteed to be invoked on the expressions if the result of the method is {@link
   * #result}.
   *
   * @return the methods guaranteed to be invoked on the expressions if the result of the method is
   *     {@link #result}
   */
  @QualifierArgument("value")
  String[] methods();

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