Java FileSystemProvider.getFileSystem方法代码示例

import java.nio.file.spi.FileSystemProvider; //导入方法依赖的package包/类
/**
 * Retrieves a file system using the default {@link FileSystems#getFileSystem(URI)}. If this
 * throws a 
 * @param uri
 * @return
 */
public static FileSystem getFileSystem(URI uri) {
	try {
		return FileSystems.getFileSystem(uri);
	} catch (FileSystemNotFoundException | ProviderNotFoundException e) {
		LOG.debug("File system scheme " + uri.getScheme() +
				" not found in the default installed providers list, attempting to find this in the "
				+ "list of additional providers");
	}

	for (WeakReference<FileSystemProvider> providerRef : providers) {
		FileSystemProvider provider = providerRef.get();
		
		if (provider != null && uri.getScheme().equals(provider.getScheme())) {
			return provider.getFileSystem(uri);
		}
	}
	
	throw new ProviderNotFoundException("Could not find provider for scheme '" + uri.getScheme() + "'");
}
 

import java.nio.file.spi.FileSystemProvider; //导入方法依赖的package包/类
/**
 * Returns any subclass that implements and handles the given scheme.
 * @param scheme a valid {@link URI} scheme
 * @see FileSystemProvider#getScheme()
 * @throws FileSystemNotFoundException if no filesystem handles this scheme
 */
public static MCRAbstractFileSystem getInstance(String scheme) {
    URI uri;
    try {
        uri = MCRPaths.getURI(scheme, "helper", SEPARATOR_STRING);
    } catch (URISyntaxException e) {
        throw new MCRException(e);
    }
    for (FileSystemProvider provider : Iterables.concat(MCRPaths.webAppProvider,
        FileSystemProvider.installedProviders())) {
        if (provider.getScheme().equals(scheme)) {
            return (MCRAbstractFileSystem) provider.getFileSystem(uri);
        }
    }
    throw new FileSystemNotFoundException("Provider \"" + scheme + "\" not found");
}
 

import java.nio.file.spi.FileSystemProvider; //导入方法依赖的package包/类
private static FileSystem defaultFileSystem() {
    // load default provider
    FileSystemProvider provider = AccessController
        .doPrivileged(new PrivilegedAction<FileSystemProvider>() {
            public FileSystemProvider run() {
                return getDefaultProvider();
            }
        });

    // return file system
    return provider.getFileSystem(URI.create("file:///"));
}
 

import java.nio.file.spi.FileSystemProvider; //导入方法依赖的package包/类
private static FileSystem defaultFileSystem() {
    // load default provider
    FileSystemProvider provider = AccessController
        .doPrivileged(new PrivilegedAction<>() {
            public FileSystemProvider run() {
                return getDefaultProvider();
            }
        });

    // return file system
    return provider.getFileSystem(URI.create("file:///"));
}
 

import java.nio.file.spi.FileSystemProvider; //导入方法依赖的package包/类
public static FileSystem zipFileSystem( URI fileJarURI ) {



        final Map<String, Object> env = Maps.map( "create", ( Object ) "true" );

        FileSystemProvider provider = loadFileSystemProvider("jar");

        Exceptions.requireNonNull(provider, "Zip file provider not found");

        FileSystem fs = null;

        try {
            fs = provider.getFileSystem( fileJarURI );
        } catch ( Exception ex ) {
            if ( provider != null ) {
                try {
                    fs = provider.newFileSystem( fileJarURI, env );
                } catch ( IOException ex2 ) {
                    Exceptions.handle( FileSystem.class,
                            Str.sputs("unable to load", fileJarURI, "as zip file system"),
                            ex2 );
                }
            }
        }

        Exceptions.requireNonNull(provider, "Zip file system was not found");

        return fs;
    }
 

import java.nio.file.spi.FileSystemProvider; //导入方法依赖的package包/类
public TestProvider(FileSystemProvider defaultProvider) {
    this.defaultProvider = defaultProvider;
    FileSystem fs = defaultProvider.getFileSystem(URI.create("file:/"));
    this.theFileSystem = new TestFileSystem(fs, this);
}
 

import java.nio.file.spi.FileSystemProvider; //导入方法依赖的package包/类
/**
 * Returns a reference to an existing {@code FileSystem}.
 *
 * <p> This method iterates over the {@link FileSystemProvider#installedProviders()
 * installed} providers to locate the provider that is identified by the URI
 * {@link URI#getScheme scheme} of the given URI. URI schemes are compared
 * without regard to case. The exact form of the URI is highly provider
 * dependent. If found, the provider's {@link FileSystemProvider#getFileSystem
 * getFileSystem} method is invoked to obtain a reference to the {@code
 * FileSystem}.
 *
 * <p> Once a file system created by this provider is {@link FileSystem#close
 * closed} it is provider-dependent if this method returns a reference to
 * the closed file system or throws {@link FileSystemNotFoundException}.
 * If the provider allows a new file system to be created with the same URI
 * as a file system it previously created then this method throws the
 * exception if invoked after the file system is closed (and before a new
 * instance is created by the {@link #newFileSystem newFileSystem} method).
 *
 * <p> If a security manager is installed then a provider implementation
 * may require to check a permission before returning a reference to an
 * existing file system. In the case of the {@link FileSystems#getDefault
 * default} file system, no permission check is required.
 *
 * @param   uri  the URI to locate the file system
 *
 * @return  the reference to the file system
 *
 * @throws  IllegalArgumentException
 *          if the pre-conditions for the {@code uri} parameter are not met
 * @throws  FileSystemNotFoundException
 *          if the file system, identified by the URI, does not exist
 * @throws  ProviderNotFoundException
 *          if a provider supporting the URI scheme is not installed
 * @throws  SecurityException
 *          if a security manager is installed and it denies an unspecified
 *          permission
 */
public static FileSystem getFileSystem(URI uri) {
    String scheme = uri.getScheme();
    for (FileSystemProvider provider: FileSystemProvider.installedProviders()) {
        if (scheme.equalsIgnoreCase(provider.getScheme())) {
            return provider.getFileSystem(uri);
        }
    }
    throw new ProviderNotFoundException("Provider \"" + scheme + "\" not found");
}
 

import java.nio.file.spi.FileSystemProvider; //导入方法依赖的package包/类
/**
 * Returns a reference to an existing {@code FileSystem}.
 *
 * <p> This method iterates over the {@link FileSystemProvider#installedProviders()
 * installed} providers to locate the provider that is identified by the URI
 * {@link URI#getScheme scheme} of the given URI. URI schemes are compared
 * without regard to case. The exact form of the URI is highly provider
 * dependent. If found, the provider's {@link FileSystemProvider#getFileSystem
 * getFileSystem} method is invoked to obtain a reference to the {@code
 * FileSystem}.
 *
 * <p> Once a file system created by this provider is {@link FileSystem#close
 * closed} it is provider-dependent if this method returns a reference to
 * the closed file system or throws {@link FileSystemNotFoundException}.
 * If the provider allows a new file system to be created with the same URI
 * as a file system it previously created then this method throws the
 * exception if invoked after the file system is closed (and before a new
 * instance is created by the {@link #newFileSystem newFileSystem} method).
 *
 * <p> If a security manager is installed then a provider implementation
 * may require to check a permission before returning a reference to an
 * existing file system. In the case of the {@link FileSystems#getDefault
 * default} file system, no permission check is required.
 *
 * @throws  IllegalArgumentException
 *          if the pre-conditions for the {@code uri} parameter are not met
 * @throws  FileSystemNotFoundException
 *          if the file system, identified by the URI, does not exist
 * @throws  ProviderNotFoundException
 *          if a provider supporting the URI scheme is not installed
 * @throws  SecurityException
 *          if a security manager is installed and it denies an unspecified
 *          permission
 */
public static FileSystem getFileSystem(URI uri) {
    String scheme = uri.getScheme();
    for (FileSystemProvider provider: FileSystemProvider.installedProviders()) {
        if (scheme.equalsIgnoreCase(provider.getScheme())) {
            return provider.getFileSystem(uri);
        }
    }
    throw new ProviderNotFoundException("Provider \"" + scheme + "\" not found");
}