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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.dataflow.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;

/**
 * {@code Pure} is a method annotation that means both {@link SideEffectFree} and {@link
 * Deterministic}. The more important of these, when performing pluggable type-checking, is usually
 * {@link SideEffectFree}.
 *
 * For a discussion of the meaning of {@code Pure} on a constructor, see the documentation of
 * {@link Deterministic}.
 *
 * This annotation is inherited by subtypes, just as if it were meta-annotated with
 * {@code @InheritedAnnotation}.
 *
 * @checker_framework.manual #type-refinement-purity Side effects, determinism, purity, and
 *     flow-sensitive analysis
 */
// @InheritedAnnotation cannot be written here, because "dataflow" project cannot depend on
// "framework" project.
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
public @interface Pure {
  /** The type of purity. */
  public static enum Kind {
    /** The method has no visible side effects. */
    SIDE_EFFECT_FREE,

    /** The method returns exactly the same value when called in the same environment. */
    DETERMINISTIC
  }
}