MetaserverModel.java

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/*
 * This file is part of JXClient, the Fullscreen Java Crossfire Client.
 *
 * JXClient is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * JXClient 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JXClient; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Copyright (C) 2005-2008 Yann Chachkoff.
 * Copyright (C) 2006-2011 Andreas Kirschbaum.
 */

package com.realtime.crossfire.jxclient.metaserver;

import com.realtime.crossfire.jxclient.util.EventListenerList2;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class MetaserverModel {

    @NotNull
    private final List<MetaserverEntry> metaList = new ArrayList<>();

    @NotNull
    private final Collection<MetaserverEntry> metaListPending = new ArrayList<>();

    @NotNull
    private final Object sync = new Object();

    @NotNull
    private final EventListenerList2<MetaserverListener> metaserverListeners = new EventListenerList2<>();

    @NotNull
    private final Map<Integer, EventListenerList2<MetaserverEntryListener>> metaserverEntryListeners = new HashMap<>();

    @Nullable
    public MetaserverEntry getEntry(final int index) {
        try {
            synchronized (sync) {
                return metaList.get(index);
            }
        } catch (final IndexOutOfBoundsException ignored) {
            return null;
        }
    }

    public int getServerIndex(@NotNull final String serverName) {
        synchronized (sync) {
            int index = 0;
            for (final MetaserverEntry metaserverEntry : metaList) {
                if (metaserverEntry.getHostname().equals(serverName)) {
                    return index;
                }

                index++;
            }
        }

        return -1;
    }

    public int size() {
        synchronized (sync) {
            return metaList.size();
        }
    }

    public void addMetaserverEntry(@NotNull final MetaserverEntry metaserverEntry) {
        synchronized (sync) {
            metaListPending.add(metaserverEntry);
        }
    }

    public void begin() {
        metaListPending.clear();
    }

    public void commit() {
        final int oldMetaListSize;
        final int newMetaListSize;
        synchronized (sync) {
            oldMetaListSize = metaList.size();
            metaList.clear();
            metaList.addAll(metaListPending);
            Collections.sort(metaList);
            newMetaListSize = metaList.size();
        }
        metaListPending.clear();

        for (final MetaserverListener metaserverListener : metaserverListeners) {
            metaserverListener.numberOfEntriesChanged();
        }

        for (int i = 0, iMax = Math.max(oldMetaListSize, newMetaListSize); i < iMax; i++) {
            for (final MetaserverEntryListener metaserverEntryListener : getMetaserverEntryListeners(i)) {
                metaserverEntryListener.entryChanged();
            }
        }
    }

    public void addMetaserverListener(@NotNull final MetaserverListener listener) {
        metaserverListeners.add(listener);
    }

    public void removeMetaserverListener(@NotNull final MetaserverListener listener) {
        metaserverListeners.remove(listener);
    }

    public void addMetaserverEntryListener(final int index, @NotNull final MetaserverEntryListener listener) {
        getMetaserverEntryListeners(index).add(listener);
    }

    public void removeMetaserverEntryListener(final int index, @NotNull final MetaserverEntryListener listener) {
        getMetaserverEntryListeners(index).remove(listener);
    }

    @NotNull
    private EventListenerList2<MetaserverEntryListener> getMetaserverEntryListeners(final int index) {
        synchronized (metaserverEntryListeners) {
            final EventListenerList2<MetaserverEntryListener> existingListeners = metaserverEntryListeners.get(index);
            if (existingListeners != null) {
                return existingListeners;
            }

            final EventListenerList2<MetaserverEntryListener> newListeners = new EventListenerList2<>();
            metaserverEntryListeners.put(index, newListeners);
            return newListeners;
        }
    }

}