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package org.glassfish.hk2.api;

/**
 * This method is called when it determined that a type that is
 * annotated with a Validating annotation is to be injected into
 * any other class.
 * 
 * @author jwells
 *
 */
public interface Validator {
    /**
     * This method is called whenever it has been determined that a validating
     * class is to be injected into an injection point, or when a descriptor
     * is being looked up explicitly with the API, or a descriptor is being
     * bound or unbound into the registry.
     * 
     * The candidate descriptor being passed in may not have yet been reified.  If
     * possible, this method should do its work without reifying the descriptor.
     * However, if it is necessary to reify the descriptor, it should be done with
     * the ServiceLocator.reifyDescriptor method.
     * 
     * The operation will determine what operation is being performed.  In the
     * BIND or UNBIND cases the Injectee will be null.  In the LOOKUP case
     * the Injectee will be non-null if this is being done as part of an
     * injection point.  In the LOOKUP case the Injectee will be null if this
     * is being looked up directly from the {@link ServiceLocator} API, in which
     * case the caller of the lookup method will be on the call frame.
     * 
     * @param info Information about the operation being performed
     * @return true if this injection should succeed, false if this candidate should not
     * be returned
     * @throws RuntimeException Any exception from this method will also cause the candidate
     * to not be available.  However, the preferred method of indicating an validation failure
     * is to return null
     */
    public boolean validate(ValidationInformation info);
}