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package org.jvnet.hk2.config;

/**
 * Objects that do not wish to process the entire change set of a transaction can
 * implement this interface and use it to invoke utility methods on ConfigSupport.
 *
 * @author Jerome Dochez
 */
public interface Changed {

    /**
     * type of change on a particular instance
     */
    public static enum TYPE { ADD, REMOVE, CHANGE };

    /**
     * Notification of a change on a configuration object
     *
     * @param type type of change : ADD mean the changedInstance was added to the parent
     * REMOVE means the changedInstance was removed from the parent, CHANGE means the
     * changedInstance has mutated.
     * @param changedType type of the configuration object
     * @param changedInstance changed instance.
     */
    public  NotProcessed changed(TYPE type, Class changedType, T changedInstance);
        
}