Class JavaPluginLoader

src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java:38–997

Represents a Java plugin loader, allowing plugins in the form of .jar

 * Represents a Java plugin loader, allowing plugins in the form of .jar
 */
public class JavaPluginLoader implements PluginLoader {
    private final Server server;
    protected final Pattern[] fileFilters = new Pattern[] {
        Pattern.compile("\\.jar$"),
    };
    protected final Map<String, Class<?>> classes = new HashMap<String, Class<?>>();
    protected final Map<String, PluginClassLoader> loaders = new HashMap<String, PluginClassLoader>();

    public JavaPluginLoader(Server instance) {
        server = instance;
    }

    public Plugin loadPlugin(File file) throws InvalidPluginException, InvalidDescriptionException, UnknownDependencyException {
        return loadPlugin(file, false);
    }

    public Plugin loadPlugin(File file, boolean ignoreSoftDependencies) throws InvalidPluginException, InvalidDescriptionException, UnknownDependencyException {
        JavaPlugin result = null;
        PluginDescriptionFile description = null;

        if (!file.exists()) {
            throw new InvalidPluginException(new FileNotFoundException(String.format("%s does not exist", file.getPath())));
        }
        try {
            JarFile jar = new JarFile(file);
            JarEntry entry = jar.getJarEntry("plugin.yml");

            if (entry == null) {
                throw new InvalidPluginException(new FileNotFoundException("Jar does not contain plugin.yml"));
            }

            InputStream stream = jar.getInputStream(entry);

            description = new PluginDescriptionFile(stream);

            stream.close();
            jar.close();
        } catch (IOException ex) {
            throw new InvalidPluginException(ex);
        } catch (YAMLException ex) {
            throw new InvalidPluginException(ex);
        }

        File dataFolder = new File(file.getParentFile(), description.getName());
        File oldDataFolder = getDataFolder(file);

        // Found old data folder
        if (dataFolder.equals(oldDataFolder)) {
            // They are equal -- nothing needs to be done!
        } else if (dataFolder.isDirectory() && oldDataFolder.isDirectory()) {
            server.getLogger().log(Level.INFO, String.format(
                "While loading %s (%s) found old-data folder: %s next to the new one: %s",
                description.getName(),
                file,
                oldDataFolder,
                dataFolder
            ));
        } else if (oldDataFolder.isDirectory() && !dataFolder.exists()) {