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• DefaultQualifier.java

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org.checkerframework.framework.qual.DefaultQualifier Maven / Gradle / Ivy

package org.checkerframework.framework.qual;

import java.lang.annotation.Annotation;
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;

/**
 * Applied to a declaration of a package, type, method, variable, etc., specifies that the given
 * annotation should be the default. The default is applied to type uses within the declaration for
 * which no other annotation is explicitly written. (The default is not applied to the "parametric
 * locations": class declarations, type parameter declarations, and type parameter uses.) If
 * multiple {@code DefaultQualifier} annotations are in scope, the innermost one takes precedence.
 * DefaultQualifier takes precedence over {@link DefaultQualifierInHierarchy}.
 *
 * 
You may write multiple {@code @DefaultQualifier} annotations (for unrelated type systems, or
 * with different {@code locations} fields) at the same location.
 *
 * 
This annotation currently has no effect in stub files.
 *
 * @see org.checkerframework.framework.qual.TypeUseLocation
 * @see DefaultQualifierInHierarchy
 * @see DefaultFor
 * @checker_framework.manual #defaults Default qualifier for unannotated types
 */
@Documented
@Retention(RetentionPolicy.SOURCE)
@Target({
    ElementType.PACKAGE,
    ElementType.TYPE,
    ElementType.CONSTRUCTOR,
    ElementType.METHOD,
    ElementType.FIELD,
    ElementType.LOCAL_VARIABLE,
    ElementType.PARAMETER
})
@Repeatable(DefaultQualifiers.class)
public @interface DefaultQualifier {

    /**
     * The Class for the default annotation.
     *
     * 
To prevent affecting other type systems, always specify an annotation in your own type
     * hierarchy. (For example, do not set {@link
     * org.checkerframework.common.subtyping.qual.Unqualified} as the default.)
     */
    Class value();

    /** @return the locations to which the annotation should be applied */
    TypeUseLocation[] locations() default {TypeUseLocation.ALL};
}