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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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 */
package org.glassfish.hk2.api;

/**
 * This object contains information about the validation
 * point.  The values available may vary depending on
 * the type of operation.
 * 
 * @author jwells
 *
 */
public interface ValidationInformation {
    /**
     * The operation that is to be performed, one of
     * BIND - The candidate descriptor is being added to the system
     * UNBIND - The candidate descriptor is being removed from the system
     * LOOKUP - The candidate descriptor is being looked up
     * 
     * 
     * @return The operation being performed
     */
    public Operation getOperation();
    
    /**
     * The candidate descriptor for this operation
     * 
     * @return The candidate descriptor for the operation being performed
     */
    public ActiveDescriptor getCandidate();
    
    /**
     * On a LOOKUP operation if the lookup is being performed due to an
     * injection point (as opposed to a lookup via the API) then this
     * method will return a non-null {@link Injectee} that is the injection
     * point that would be injected into
     * 
     * @return The injection point being injected into on a LOOKUP operation
     */
    public Injectee getInjectee();
    
    /**
     * On a LOOKUP operation the {@link Filter} that was used in the
     * lookup operation.  This may give more information about what
     * exactly was being looked up by the caller
     * 
     * @return The filter used in the lookup operation
     */
    public Filter getFilter();
    
    /**
     * This method attempts to return the StackTraceElement
     * of the code calling the HK2 method that caused
     * this validation to occur
     * 
     * This method may not work properly if called outside
     * of the call frame of the {@link Validator#validate(ValidationInformation)}
     * method
     * 
     * @return The caller of the HK2 API that caused this
     * validation to occur, or null if the caller could
     * not be determined
     */
    public StackTraceElement getCaller();

}