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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
**
** http://oss.sgi.com/projects/FreeB
**
** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
**
** NOTE:  The Original Code (as defined below) has been licensed to Sun
** Microsystems, Inc. ("Sun") under the SGI Free Software License B
** (Version 1.1), shown above ("SGI License").   Pursuant to Section
** 3.2(3) of the SGI License, Sun is distributing the Covered Code to
** you under an alternative license ("Alternative License").  This
** Alternative License includes all of the provisions of the SGI License
** except that Section 2.2 and 11 are omitted.  Any differences between
** the Alternative License and the SGI License are offered solely by Sun
** and not by SGI.
**
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
**
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
**
** Author: Eric Veach, July 1994
** Java Port: Pepijn Van Eeckhoudt, July 2003
** Java Port: Nathan Parker Burg, August 2003
*/
package com.sun.prism.util.tess.impl.tess;

class Dict {
    DictNode head;
    Object frame;
    DictLeq leq;

    private Dict() {
    }

    static Dict dictNewDict(Object frame, DictLeq leq) {
        Dict dict = new Dict();
        dict.head = new DictNode();

        dict.head.key = null;
        dict.head.next = dict.head;
        dict.head.prev = dict.head;

        dict.frame = frame;
        dict.leq = leq;

        return dict;
    }

    static void dictDeleteDict(Dict dict) {
        dict.head = null;
        dict.frame = null;
        dict.leq = null;
    }

    static DictNode dictInsert(Dict dict, Object key) {
        return dictInsertBefore(dict, dict.head, key);
    }

    static DictNode dictInsertBefore(Dict dict, DictNode node, Object key) {
        do {
            node = node.prev;
        } while (node.key != null && !dict.leq.leq(dict.frame, node.key, key));

        DictNode newNode = new DictNode();
        newNode.key = key;
        newNode.next = node.next;
        node.next.prev = newNode;
        newNode.prev = node;
        node.next = newNode;

        return newNode;
    }

    static Object dictKey(DictNode aNode) {
        return aNode.key;
    }

    static DictNode dictSucc(DictNode aNode) {
        return aNode.next;
    }

    static DictNode dictPred(DictNode aNode) {
        return aNode.prev;
    }

    static DictNode dictMin(Dict aDict) {
        return aDict.head.next;
    }

    static DictNode dictMax(Dict aDict) {
        return aDict.head.prev;
    }

    static void dictDelete(Dict dict, DictNode node) {
        node.next.prev = node.prev;
        node.prev.next = node.next;
    }

    static DictNode dictSearch(Dict dict, Object key) {
        DictNode node = dict.head;

        do {
            node = node.next;
        } while (node.key != null && !(dict.leq.leq(dict.frame, key, node.key)));

        return node;
    }

    public interface DictLeq {
        boolean leq(Object frame, Object key1, Object key2);
    }
}