InventoryView.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) 2006-2017,2019-2023 Andreas Kirschbaum
 * Copyright (C) 2010-2012,2014-2018,2020-2023 Nicolas Weeger
 */
 
package com.realtime.crossfire.jxclient.items;
 
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import javax.swing.SwingUtilities;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
 
public class InventoryView extends AbstractItemView {
 
    @NotNull
    private final ItemSet itemSet;
 
    @NotNull
    private final Comparator<CfItem> comparator;
 
    @NotNull
    private final Object sync = new Object();
 
    private long changeTimestamp = System.currentTimeMillis();
 
    @SuppressWarnings("FieldAccessedSynchronizedAndUnsynchronized")
    private int currentPlayerTag;
 
    @NotNull
    private final List<CfItem> items = new ArrayList<>();
 
    @NotNull
    @SuppressWarnings("FieldCanBeLocal")
    private final ItemSetListener itemSetListener = new ItemSetListener() {
 
        @Override
        public void playerChanged(@Nullable final CfItem player) {
            setCurrentPlayerTag(player == null ? -1 : player.getTag());
        }
 
        @Override
        public void openContainerChanged(final int tag) {
            // ignore
        }
 
    };
 
    @NotNull
    private final ItemListener playerInventoryListener = new ItemListener() {
 
        @Override
        public void itemChanged(final int tag) {
            if (tag != currentPlayerTag) {
                throw new IllegalArgumentException("tag="+tag+" but expecting currentPlayerTag="+currentPlayerTag);
            }
            setCurrentPlayerTag(currentPlayerTag);
        }
 
        @Override
        public void itemRemoved(final int tag) {
            // ignore; will be detected by itemSetListener
        }
 
        @Override
        public void inventoryAdded(final int tag, final int index, @NotNull final CfItem item) {
            if (tag != currentPlayerTag) {
                throw new IllegalArgumentException("tag="+tag+" but expecting currentPlayerTag="+currentPlayerTag);
            }
            setCurrentPlayerTag(currentPlayerTag);
        }
 
        @Override
        public void inventoryRemoved(final int tag, final int index) {
            if (tag != currentPlayerTag) {
                throw new IllegalArgumentException("tag="+tag+" but expecting currentPlayerTag="+currentPlayerTag);
            }
            setCurrentPlayerTag(currentPlayerTag);
        }
 
    };
 
    @NotNull
    private final CfItemListener itemModifiedListener = () -> setCurrentPlayerTag(currentPlayerTag);
 
    @NotNull
    @SuppressWarnings("FieldAccessedSynchronizedAndUnsynchronized")
    private InventoryFilter filter = InventoryFilter.ALL;
 
    public InventoryView(@NotNull final ItemSet itemSet, @NotNull final Comparator<CfItem> comparator) {
        this.itemSet = itemSet;
        this.comparator = comparator;
        final Thread thread = new Thread(this::run, "inventory view refresh");
        thread.setDaemon(true);
        //noinspection CallToThreadStartDuringObjectConstruction
        thread.start();
        itemSet.addItemSetListener(itemSetListener);
        final CfItem player = itemSet.getPlayer();
        currentPlayerTag = player == null ? -1 : player.getTag();
    }
 
    private void setCurrentPlayerTag(final int currentPlayerTag) {
        if (this.currentPlayerTag != currentPlayerTag) {
            if (this.currentPlayerTag != -1) {
                itemSet.removeInventoryListener(this.currentPlayerTag, playerInventoryListener);
            }
            this.currentPlayerTag = currentPlayerTag;
            if (this.currentPlayerTag != -1) {
                itemSet.addInventoryListener(this.currentPlayerTag, playerInventoryListener);
            }
        }
 
        synchronized (sync) {
            changeTimestamp = System.currentTimeMillis();
            sync.notifyAll();
        }
    }
 
    private void run() {
        try {
            while (!Thread.currentThread().isInterrupted()) {
                final long milliseconds;
                synchronized (sync) {
                    if (changeTimestamp == 0) {
                        //noinspection WaitOrAwaitWithoutTimeout
                        sync.wait();
                        continue;
                    }
 
                    milliseconds = changeTimestamp+50-System.currentTimeMillis();
                    if (milliseconds <= 0) {
                        changeTimestamp = 0;
                    }
                }
 
                if (milliseconds > 0) {
                    //noinspection BusyWait
                    Thread.sleep(milliseconds);
                    continue;
                }
 
                SwingUtilities.invokeLater(this::doRebuildInventory);
            }
        } catch (final InterruptedException ignored) {
            Thread.currentThread().interrupt();
        }
    }
 
    private void doRebuildInventory() {
        final int oldSize;
        final int newSize;
        synchronized (items) {
            oldSize = items.size();
            for (final CfItem item : items) {
                item.removeCfItemModifiedListener(itemModifiedListener);
            }
            items.clear();
            if (currentPlayerTag != -1) {
                for (final CfItem item : itemSet.getPlayerInventory()) {
                    final int index = findInsertionIndex(item);
                    if (index != -1) {
                        items.add(index, item);
                        item.addCfItemModifiedListener(itemModifiedListener);
                    }
                }
            }
            newSize = items.size();
        }
        addModifiedRange(0, Math.max(oldSize, newSize)-1);
    }
 
    @Override
    public int getSize() {
        synchronized (items) {
            return items.size();
        }
    }
 
    @Nullable
    @Override
    public CfItem getItem(final int index) {
        try {
            synchronized (items) {
                return items.get(index);
            }
        } catch (final IndexOutOfBoundsException ignored) {
            return null;
        }
    }
 
    private int findInsertionIndex(@NotNull final CfItem item) {
        if (!filter.matches(item)) {
            return -1;
        }
 
        int i;
        synchronized (items) {
            for (i = 0; i < items.size(); i++) {
                if (comparator.compare(items.get(i), item) >= 0) {
                    break;
                }
            }
        }
        return i;
    }
 
    public void setFilter(@NotNull final InventoryFilter filter) {
        if (this.filter == filter) {
            return;
        }
 
        this.filter = filter;
        setCurrentPlayerTag(currentPlayerTag);
    }
 
}