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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2011, 2012, 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.
 */
package com.sun.javafx.css;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javafx.css.PseudoClass;

/**
 * States represents a set of State. A {@code Node} may be in more than
 * one pseudo-class state. {@code States} is used to aggregate the active
 * pseudo-class state of a {@code Node}.
 */
public final class PseudoClassState extends BitSet {

    /** Create an empty set of PseudoClass */
    public PseudoClassState() {
        super();
    }

    PseudoClassState(List pseudoClassNames) {
        super();
        
        int nMax = pseudoClassNames != null ? pseudoClassNames.size() : 0;
        for(int n=0; n T[] toArray(T[] a) {
        if (a.length < size()) {
            a = (T[]) new PseudoClass[size()];
        }
        int index = 0;
        while(index < getBits().length) {
            final long state = getBits()[index];
            for(int bit=0; bit strings = new ArrayList();
        Iterator iter = iterator();
        while (iter.hasNext()) {
            strings.add(iter.next().getPseudoClassName());
        }
        return strings.toString();
    }
   
    @Override
    protected PseudoClass cast(Object o) {
        if (o == null) {
            throw new NullPointerException("null arg");
        }
        PseudoClass pseudoClass = (PseudoClass) o;
        return pseudoClass;
    }
    
    @Override
    protected PseudoClass getT(int index) {
        return getPseudoClass(index);
    }

    @Override
    protected int getIndex(PseudoClass t) {
        
        if (t instanceof PseudoClassImpl) {
            return ((PseudoClassImpl)t).getIndex();
        }
        
        final String pseudoClass = t.getPseudoClassName();
        Integer index = pseudoClassMap.get(pseudoClass);
        
        if (index == null) {
            index = Integer.valueOf(pseudoClasses.size());
            pseudoClasses.add(new PseudoClassImpl(pseudoClass, index.intValue()));
            pseudoClassMap.put(pseudoClass, index);        
        }
        return index.intValue();
        
    }

   
    /**
     * @see javafx.css.PseudoClass#getPseudoClass(String)
     */
    public static PseudoClass getPseudoClass(String pseudoClass) {

        if (pseudoClass == null || pseudoClass.trim().isEmpty()) {
            throw new IllegalArgumentException("pseudoClass cannot be null or empty String");
        }

        PseudoClass instance = null;
        
        final Integer value = pseudoClassMap.get(pseudoClass);
        final int index = value != null ? value.intValue() : -1;
        
        final int size = pseudoClasses.size();
        assert index < size;
        
        if (index != -1 && index < size) {
            instance = pseudoClasses.get(index);
        }
        
        if (instance == null) {
            instance = new PseudoClassImpl(pseudoClass, size);
            pseudoClasses.add(instance);
            pseudoClassMap.put(pseudoClass, Integer.valueOf(size));
        }
        
        return instance;
    }
   
    static PseudoClass getPseudoClass(int index) {
       if (0 <= index && index < pseudoClasses.size()) {
           return pseudoClasses.get(index);
       }
       return null;
    }
   
    // package private for unit test purposes
    static final Map pseudoClassMap = 
            new HashMap(64);

    static final List pseudoClasses =
            new ArrayList();

}