/*
 * Copyright (c) 2008 Israfil Consulting Services Corporation
 * Copyright (c) 2008 Christian Edward Gruber
 * All Rights Reserved
 * 
 * This software is licensed under the Berkeley Standard Distribution license,
 * (BSD license), as defined below:
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this 
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of Israfil Consulting Services nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software without 
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
 * OF SUCH DAMAGE.
 * 
 * $Id: Copyright.java 618 2008-04-14 14:03:03Z christianedwardgruber $
 */
package net.israfil.foundation.container.util;

import java.util.Map;

import net.israfil.foundation.container.AutoWiringAdapter;
import net.israfil.foundation.container.error.CyclicalDependencyError;

/**
 * A utility class that provides convenience methods for circular 
 * reference detection.
 * 
 * @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber </a>
 */
public class CyclicalReferenceDetectionUtil { 
	public static void detectCircularDependencies(Map registry, NonDuplicateStack nds, AutoWiringAdapter componentAdapter) {
		Object[] deps = componentAdapter.dependencies();
		for (int i = 0; i < deps.length; i++) {
			if (registry.containsKey(deps[i])) {
				try {
					nds.push(deps[i]);
				} catch (IllegalArgumentException e) {
					throw new CyclicalDependencyError("Item " + deps[i] + " is involved in a cyclic dependency.  The full path is: " + nds);
				}
				detectCircularDependencies(registry, nds, (AutoWiringAdapter)registry.get(deps[i]));
				nds.pop();
			}
		}
	}
}