FileCache.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.faces;
 
import com.realtime.crossfire.jxclient.util.FilenameUtils;
import com.realtime.crossfire.jxclient.util.Images;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
 
public class FileCache implements ImageCache {
 
    @NotNull
    private final Path cacheDir;
 
    public FileCache(@NotNull final Path cacheDir) {
        this.cacheDir = cacheDir;
        try {
            Files.createDirectories(cacheDir);
        } catch (final IOException ex) {
            System.err.println(cacheDir+": cannot create directory: "+ex);
        }
    }
 
    @Nullable
    @Override
    public ImageIcon load(@NotNull final Face face) {
        return load(face.getFaceName(), face.getFaceChecksum());
    }
 
    @Nullable
    private ImageIcon load(@NotNull final String faceName, final int faceChecksum) {
        final Path file = getImageFileName(faceName, faceChecksum);
        final long len;
        try {
            len = Files.size(file);
        } catch (final IOException ignored) {
            return null;
        }
        if (len >= 0x10000 || len <= 0) {
            return null;
        }
        final byte[] data = new byte[(int)len];
        try {
            try (InputStream fis = Files.newInputStream(file)) {
                if (fis.read(data) != data.length) {
                    return null;
                }
            }
        } catch (final IOException ignored) {
            return null;
        }
        final ImageIcon imageIcon = new ImageIcon(data); // cannot use ImageIcon(String) since this caches "file not found"
        return imageIcon.getIconWidth() <= 0 && imageIcon.getIconHeight() <= 0 ? null : imageIcon;
    }
 
    @Override
    public void save(@NotNull final Face face, @NotNull final ImageIcon imageIcon) {
        save(face.getFaceName(), face.getFaceChecksum(), imageIcon);
    }
 
    public void save(@NotNull final String faceName, final int faceChecksum, @NotNull final Icon imageIcon) {
        Images.saveImageIcon(getImageFileName(faceName, faceChecksum), imageIcon);
    }
 
    @NotNull
    private Path getImageFileName(@NotNull final String faceName, final int faceChecksum) {
        final String quotedFaceName = FilenameUtils.quoteName(faceName);
        final String dirName = quotedFaceName.substring(0, Math.min(2, quotedFaceName.length()));
        final Path dir = cacheDir.resolve(dirName).resolve(quotedFaceName);
        try {
            Files.createDirectories(dir);
        } catch (final IOException ex) {
            System.err.println(dir+": cannot create directory: "+ex);
        }
        return dir.resolve(Integer.toString(faceChecksum));
    }
 
}