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/*
 * Copyright (c) 2011, 2023, 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.binding;

import javafx.beans.WeakListener;
import javafx.collections.*;

import java.lang.ref.WeakReference;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 */
public class ContentBinding {

    private static void checkParameters(Object property1, Object property2) {
        if ((property1 == null) || (property2 == null)) {
            throw new NullPointerException("Both parameters must be specified.");
        }
        if (property1 == property2) {
            throw new IllegalArgumentException("Cannot bind object to itself");
        }
    }

    public static  Object bind(List list1, ObservableList list2) {
        checkParameters(list1, list2);
        final ListContentBinding contentBinding = new ListContentBinding<>(list1);
        if (list1 instanceof ObservableList observableList) {
            observableList.setAll(list2);
        } else {
            list1.clear();
            list1.addAll(list2);
        }
        list2.removeListener(contentBinding);
        list2.addListener(contentBinding);
        return contentBinding;
    }

    public static  Object bind(Set set1, ObservableSet set2) {
        checkParameters(set1, set2);
        final SetContentBinding contentBinding = new SetContentBinding<>(set1);
        set1.clear();
        set1.addAll(set2);
        set2.removeListener(contentBinding);
        set2.addListener(contentBinding);
        return contentBinding;
    }

    public static  Object bind(Map map1, ObservableMap map2) {
        checkParameters(map1, map2);
        final MapContentBinding contentBinding = new MapContentBinding<>(map1);
        map1.clear();
        map1.putAll(map2);
        map2.removeListener(contentBinding);
        map2.addListener(contentBinding);
        return contentBinding;
    }

    public static void unbind(Object obj1, Object obj2) {
        checkParameters(obj1, obj2);
        if ((obj1 instanceof List list1) && (obj2 instanceof ObservableList list2)) {
            @SuppressWarnings("unchecked")
            ListContentBinding binding = new ListContentBinding<>((List) list1);

            list2.removeListener(binding);
        } else if ((obj1 instanceof Set set1) && (obj2 instanceof ObservableSet set2)) {
            @SuppressWarnings("unchecked")
            SetContentBinding binding = new SetContentBinding<>((Set) set1);

            set2.removeListener(binding);
        } else if ((obj1 instanceof Map map1) && (obj2 instanceof ObservableMap map2)) {
            @SuppressWarnings("unchecked")
            MapContentBinding binding = new MapContentBinding<>((Map) map1);

            map2.removeListener(binding);
        }
    }

    private static class ListContentBinding implements ListChangeListener, WeakListener {

        private final WeakReference> listRef;

        public ListContentBinding(List list) {
            this.listRef = new WeakReference<>(list);
        }

        @Override
        public void onChanged(Change change) {
            final List list = listRef.get();
            if (list == null) {
                change.getList().removeListener(this);
            } else {
                while (change.next()) {
                    if (change.wasPermutated()) {
                        list.subList(change.getFrom(), change.getTo()).clear();
                        list.addAll(change.getFrom(), change.getList().subList(change.getFrom(), change.getTo()));
                    } else {
                        if (change.wasRemoved()) {
                            list.subList(change.getFrom(), change.getFrom() + change.getRemovedSize()).clear();
                        }
                        if (change.wasAdded()) {
                            list.addAll(change.getFrom(), change.getAddedSubList());
                        }
                    }
                }
            }
        }

        @Override
        public boolean wasGarbageCollected() {
            return listRef.get() == null;
        }

        @Override
        public int hashCode() {
            final List list = listRef.get();
            return (list == null)? 0 : list.hashCode();
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }

            final List list1 = listRef.get();
            if (list1 == null) {
                return false;
            }

            if (obj instanceof ListContentBinding) {
                final ListContentBinding other = (ListContentBinding) obj;
                final List list2 = other.listRef.get();
                return list1 == list2;
            }
            return false;
        }
    }

    private static class SetContentBinding implements SetChangeListener, WeakListener {

        private final WeakReference> setRef;

        public SetContentBinding(Set set) {
            this.setRef = new WeakReference<>(set);
        }

        @Override
        public void onChanged(Change change) {
            final Set set = setRef.get();
            if (set == null) {
                change.getSet().removeListener(this);
            } else {
                if (change.wasRemoved()) {
                    set.remove(change.getElementRemoved());
                } else {
                    set.add(change.getElementAdded());
                }
            }
        }

        @Override
        public boolean wasGarbageCollected() {
            return setRef.get() == null;
        }

        @Override
        public int hashCode() {
            final Set set = setRef.get();
            return (set == null)? 0 : set.hashCode();
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }

            final Set set1 = setRef.get();
            if (set1 == null) {
                return false;
            }

            if (obj instanceof SetContentBinding) {
                final SetContentBinding other = (SetContentBinding) obj;
                final Set set2 = other.setRef.get();
                return set1 == set2;
            }
            return false;
        }
    }

    private static class MapContentBinding implements MapChangeListener, WeakListener {

        private final WeakReference> mapRef;

        public MapContentBinding(Map map) {
            this.mapRef = new WeakReference<>(map);
        }

        @Override
        public void onChanged(Change change) {
            final Map map = mapRef.get();
            if (map == null) {
                change.getMap().removeListener(this);
            } else {
                if (change.wasRemoved()) {
                    map.remove(change.getKey());
                }
                if (change.wasAdded()) {
                    map.put(change.getKey(), change.getValueAdded());
                }
            }
        }

        @Override
        public boolean wasGarbageCollected() {
            return mapRef.get() == null;
        }

        @Override
        public int hashCode() {
            final Map map = mapRef.get();
            return (map == null)? 0 : map.hashCode();
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }

            final Map map1 = mapRef.get();
            if (map1 == null) {
                return false;
            }

            if (obj instanceof MapContentBinding) {
                final MapContentBinding other = (MapContentBinding) obj;
                final Map map2 = other.mapRef.get();
                return map1 == map2;
            }
            return false;
        }
    }
}
    

    

    

            

    

            



    
    






    
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