arez.annotations.ComputedValueRef Maven / Gradle / Ivy

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Arez Annotations

There is a newer version: 0.95

package arez.annotations;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Target;
import javax.annotation.Nonnull;
import org.realityforge.anodoc.Unsupported;

/**
 * Marks a template method that returns the {@link arez.ComputedValue} instance for
 * the {@link Computed} annotated property. Each property marked with the {@link Computed} annotation is backed
 * by an {@link arez.ComputedValue} instance and some frameworks make use of this value to implement
 * advanced functionality.
 *
 * The method that is annotated with @ObservableRef must also comply with the following constraints:
 * 
 * Must not be annotated with any other arez annotation
 * Must not be private
 * Must not be static
 * Must not be final
 * Must be abstract
 * Must not throw any exceptions
 * Must return an instance of {@link arez.ComputedValue}.
 * 
 */
@Documented
@Target( ElementType.METHOD )
@Unsupported( "This is largely experimental and intended for framework users rather than casual users of the framework" )
public @interface ComputedValueRef
{
  /**
   * Return the name of the associated Computed property that this ref relates to.
   * This value will be derived if the method name matches the pattern "get[Name]ComputedValue",
   * otherwise it must be specified.
   *
   * @return the name of the associated ComputedValue.
   */
  @Nonnull
  String name() default "";
}