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This module contains the Metro runtime code.
There is a newer version: 4.0.4
/* 
 *  DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *  
 *  Copyright (c) 2007-2010 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
 *  language governing permissions and limitations under the License.
 *  
 *  When distributing the software, include this License Header Notice in each
 *  file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 *  
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 *  exception as provided by Oracle in the GPL Version 2 section of the License
 *  file that accompanied this code.
 *  
 *  Modifications:
 *  If applicable, add the following below the License Header, with the fields
 *  enclosed by brackets [] replaced by your own identifying information:
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 *  Version 2] license."  If you don't indicate a single choice of license, a
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package org.glassfish.gmbal.generic ;

import java.util.List ;
import java.util.Collection ;
import java.util.Collections ;
import java.util.Set ;
import java.util.HashSet ;
import java.util.ArrayList ;

public class Graph {
    /** A Finder finds the immediate successors of an element of the graph.
     */
    public interface Finder extends UnaryFunction> {} 

    private Set roots ;
    private List preorderTraversal = null ;
    private List postorderTraversal = null ;

    private void traverse( final E node, final Set visited, final Finder finder ) {
	if (!visited.contains( node )) {
	    visited.add( node ) ;

	    preorderTraversal.add( node ) ;

	    for (E child : finder.evaluate(node)) {
		traverse( child, visited, finder ) ;
	    }

	    postorderTraversal.add( node ) ;
	}
    }

    private void init( final Collection roots, final Finder finder ) {
	this.roots = new HashSet( roots ) ;
	this.roots = Collections.unmodifiableSet( this.roots ) ;
	this.preorderTraversal = new ArrayList() ;
	this.postorderTraversal = new ArrayList() ;
	final Set visited = new HashSet() ;
	for (E node : this.roots) {
	    traverse( node, visited, finder ) ;
	}
	this.preorderTraversal = Collections.unmodifiableList( this.preorderTraversal ) ;
	this.postorderTraversal = Collections.unmodifiableList( this.postorderTraversal ) ;
    }

    public Graph( final Collection roots, final Finder finder ) {
	init( roots, finder ) ;
    }

    public Graph( final E root, final Finder finder )   {
	final Set roots = new HashSet() ;
	roots.add( root ) ;
	init( roots, finder ) ;
    }

    public Set getRoots() {
	return roots ;
    }

    public List getPreorderList() {
	return preorderTraversal ;
    }

    public List getPostorderList() {
	return postorderTraversal ;
    }
}