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package org.junit.experimental.theories;
import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.PARAMETER;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Annotating a {@link org.junit.experimental.theories.Theory Theory} method
* parameter with @ParametersSuppliedBy causes it to be supplied with
* values from the named
* {@link org.junit.experimental.theories.ParameterSupplier ParameterSupplier}
* when run as a theory by the {@link org.junit.experimental.theories.Theories
* Theories} runner.
*
* In addition, annotations themselves can be annotated with
* @ParametersSuppliedBy, and then used similarly. ParameterSuppliedBy
* annotations on parameters are detected by searching up this heirarchy such
* that these act as syntactic sugar, making:
*
* <pre>
* @ParametersSuppliedBy(Supplier.class)
* public @interface SpecialParameter { }
*
* @Theory
* public void theoryMethod(@SpecialParameter String param) {
* ...
* }
* </pre>
*
* equivalent to:
*
* <pre>
* @Theory
* public void theoryMethod(@ParametersSuppliedBy(Supplier.class) String param) {
* ...
* }
* </pre>
*/
@Retention(RetentionPolicy.RUNTIME)
@Target({ ANNOTATION_TYPE, PARAMETER })
public @interface ParametersSuppliedBy {
Class<? extends ParameterSupplier> value();
}
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