Java OpenOption類代碼示例

import java.nio.file.OpenOption; //導入依賴的package包/類
/**
 * Open/creates file, returning FileChannel to access the file
 *
 * @param   pathForWindows
 *          The path of the file to open/create
 * @param   pathToCheck
 *          The path used for permission checks (if security manager)
 */
static FileChannel newFileChannel(String pathForWindows,
                                  String pathToCheck,
                                  Set<? extends OpenOption> options,
                                  long pSecurityDescriptor)
    throws WindowsException
{
    Flags flags = Flags.toFlags(options);

    // default is reading; append => writing
    if (!flags.read && !flags.write) {
        if (flags.append) {
            flags.write = true;
        } else {
            flags.read = true;
        }
    }

    // validation
    if (flags.read && flags.append)
        throw new IllegalArgumentException("READ + APPEND not allowed");
    if (flags.append && flags.truncateExisting)
        throw new IllegalArgumentException("APPEND + TRUNCATE_EXISTING not allowed");

    FileDescriptor fdObj = open(pathForWindows, pathToCheck, flags, pSecurityDescriptor);
    return FileChannelImpl.open(fdObj, pathForWindows, flags.read, flags.write, flags.append, null);
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
/**
 * Write the dex program resources to @code{archive} and the proguard resource as its sibling.
 */
public void writeToZip(Path archive, OutputMode outputMode) throws IOException {
  OpenOption[] options =
      new OpenOption[] {StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING};
  try (Closer closer = Closer.create()) {
    try (ZipOutputStream out = new ZipOutputStream(Files.newOutputStream(archive, options))) {
      List<Resource> dexProgramSources = getDexProgramResources();
      for (int i = 0; i < dexProgramSources.size(); i++) {
        ZipEntry zipEntry = new ZipEntry(outputMode.getOutputPath(dexProgramSources.get(i), i));
        byte[] bytes =
            ByteStreams.toByteArray(closer.register(dexProgramSources.get(i).getStream()));
        zipEntry.setSize(bytes.length);
        out.putNextEntry(zipEntry);
        out.write(bytes);
        out.closeEntry();
      }
    }
  }
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
public Set<OpenOption> fuseOpenFlagsToNioOpenOptions(Set<OpenFlags> flags) {
	Set<OpenOption> result = new HashSet<>();
	if (flags.contains(OpenFlags.O_RDONLY) || flags.contains(OpenFlags.O_RDWR)) {
		result.add(StandardOpenOption.READ);
	}
	if (flags.contains(OpenFlags.O_WRONLY) || flags.contains(OpenFlags.O_RDWR)) {
		result.add(StandardOpenOption.WRITE);
	}
	if (flags.contains(OpenFlags.O_APPEND)) {
		result.add(StandardOpenOption.APPEND);
	}
	if (flags.contains(OpenFlags.O_TRUNC)) {
		result.add(StandardOpenOption.TRUNCATE_EXISTING);
	}
	return result;
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
/**
 * Returns a {@code BodyHandler<Path>} that returns a
 * {@link BodyProcessor BodyProcessor}&lt;{@link Path}&gt;
 * where the download directory is specified, but the filename is
 * obtained from the {@code Content-Disposition} response header. The
 * {@code Content-Disposition} header must specify the <i>attachment</i> type
 * and must also contain a
 * <i>filename</i> parameter. If the filename specifies multiple path
 * components only the final component is used as the filename (with the
 * given directory name). When the {@code HttpResponse} object is
 * returned, the body has been completely written to the file and {@link
 * #body()} returns a {@code Path} object for the file. The returned {@code Path} is the
 * combination of the supplied directory name and the file name supplied
 * by the server. If the destination directory does not exist or cannot
 * be written to, then the response will fail with an {@link IOException}.
 *
 * @param directory the directory to store the file in
 * @param openOptions open options
 * @return a response body handler
 */
public static BodyHandler<Path> asFileDownload(Path directory, OpenOption... openOptions) {
    return (status, headers) -> {
        String dispoHeader = headers.firstValue("Content-Disposition")
                .orElseThrow(() -> unchecked(new IOException("No Content-Disposition")));
        if (!dispoHeader.startsWith("attachment;")) {
            throw unchecked(new IOException("Unknown Content-Disposition type"));
        }
        int n = dispoHeader.indexOf("filename=");
        if (n == -1) {
            throw unchecked(new IOException("Bad Content-Disposition type"));
        }
        int lastsemi = dispoHeader.lastIndexOf(';');
        String disposition;
        if (lastsemi < n) {
            disposition = dispoHeader.substring(n + 9);
        } else {
            disposition = dispoHeader.substring(n + 9, lastsemi);
        }
        Path file = Paths.get(directory.toString(), disposition);
        return BodyProcessor.asFile(file, openOptions);
    };
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
private static void fchCopy(Path src, Path dst) throws IOException
{
    Set<OpenOption> read = new HashSet<>();
    read.add(READ);
    Set<OpenOption> openwrite = new HashSet<>();
    openwrite.add(CREATE_NEW);
    openwrite.add(WRITE);

    try (FileChannel srcFc = src.getFileSystem()
                                .provider()
                                .newFileChannel(src, read);
         FileChannel dstFc = dst.getFileSystem()
                                .provider()
                                .newFileChannel(dst, openwrite))
    {
        ByteBuffer bb = ByteBuffer.allocate(8192);
        while (srcFc.read(bb) >= 0) {
            bb.flip();
            dstFc.write(bb);
            bb.clear();
        }
    }
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
/**
 * File access is checked using {@link #checkAccess(BlobStoreContext, CloudPath, Set)}
 * always with {@link AclEntryPermission#WRITE_DATA} and {@link AclEntryPermission#ADD_FILE},
 * and optionally with {@link AclEntryPermission#APPEND_DATA} if <em>options</em> contains
 * {@link StandardOpenOption#APPEND}.
 * @see	CloudFileChannel
 */
@Override
public CloudFileChannel newByteChannel(BlobStoreContext context, CloudPath path,
		Set<? extends OpenOption> options, FileAttribute<?>... attrs) throws IOException {
	EnumSet<AclEntryPermission> channelPerms = EnumSet.noneOf(AclEntryPermission.class);
	options.forEach(o -> {
		AclEntryPermission aclPerm = openOptionToAclEntryPermission(o);
		if (aclPerm != null) {
			channelPerms.add(aclPerm);
		}
	});

	// Check the parent path for file add
	if (channelPerms.remove(AclEntryPermission.ADD_FILE)) {
		checkAccess(context, path.getParent(), CREATE_NEW_FILE_PERMS);
	}

	// Check file access if the file exists
	if (path.exists()) {
		checkAccess(context, path, channelPerms);
	}
	
	// Create the channel
	return new CloudFileChannel(context, path, getCloudFileChannelTransport(), options, attrs);
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
/**
 * Transforms a {@link StandardOpenOption} into an {@link AclEntryPermission}. Other
 * {@link OpenOption} types are ignored.
 * @param o
 * @return The option as an ACL permission or null if this is not applicable.
 */
protected AclEntryPermission openOptionToAclEntryPermission(OpenOption o) {
	if (o instanceof StandardOpenOption) {
		switch ((StandardOpenOption)o) {
			case APPEND: return AclEntryPermission.APPEND_DATA;
			case CREATE: return AclEntryPermission.ADD_FILE;
			case CREATE_NEW: return AclEntryPermission.ADD_FILE;
			case DELETE_ON_CLOSE: return AclEntryPermission.DELETE;
			case READ: return AclEntryPermission.READ_DATA;
			case TRUNCATE_EXISTING: return AclEntryPermission.APPEND_DATA;
			case WRITE: return AclEntryPermission.WRITE_DATA;
			default: return null;
		}
	}

	return null;
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
@Override
public SeekableByteChannel newByteChannel( Set<? extends OpenOption> options, FileAttribute<?>... attrs )
        throws IOException
{
    MemoryFileStore mfs = fs.getFileStore();
    MemoryFile file;
    if( options.contains( StandardOpenOption.CREATE_NEW ) ) {
        // FIXME need to fail if it already exists
        file = mfs.getOrCreateFile( this );
    }
    else if( options.contains( StandardOpenOption.CREATE ) ) {
        file = mfs.getOrCreateFile( this );
    }
    else {
        file = mfs.findFile( this );
    }

    return file.newByteChannel( this, options, attrs );
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
public SeekableByteChannel newByteChannel( Path path, Set<? extends OpenOption> options, FileAttribute<?>... attrs )
        throws IOException
{
    boolean append = true;
    if( options.contains( StandardOpenOption.APPEND ) ) {
        append = true;
    }
    else if( options.contains( StandardOpenOption.TRUNCATE_EXISTING ) ) {
        append = false;
    }

    if( options.contains( StandardOpenOption.READ ) ) {
        return new MemChannel.Read( buffer );
    }

    if( options.contains( StandardOpenOption.WRITE ) ) {
        if( !append ) {
            truncate();
        }
        return new MemChannel.Appender( buffer );
    }

    throw new IOException( "Must read or write" );
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
/**
 * Opens a file, returning a seekable byte channel to access the file.
 * See
 * @throws  IllegalArgumentException
 *          if the set contains an invalid combination of options
 * @throws  UnsupportedOperationException
 *          if an unsupported open option is specified
 * @throws  IOException
 *          if an I/O error occurs
 *
 * @see java.nio.channels.FileChannel#open(Path,Set,FileAttribute[])
 */
public FileChannel getFileChannel(Set<? extends OpenOption> options) throws IOException {
    for (OpenOption option : options) {
        checkOpenOption(option);
    }
    File localFile;
    try {
        localFile = getLocalFile();
    } catch (IOException e) {
        throw new NoSuchFileException(toPath().toString(), null, e.getMessage());
    }
    FileChannel fileChannel = FileChannel.open(localFile.toPath(), options);
    boolean write = options.contains(StandardOpenOption.WRITE) || options.contains(StandardOpenOption.APPEND);
    boolean read = options.contains(StandardOpenOption.READ) || !write;
    return new MCRFileChannel(this, fileChannel, write);
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
WriteAsyncFileConfig(C config, File file, Charset charset, ConfigWriter<? super C> writer,
					 WritingMode writingMode, ConfigParser<?, ? super C> parser,
					 ParsingMode parsingMode, FileNotFoundAction nefAction) {
	super(config);
	this.file = file;
	this.charset = charset;
	this.writer = writer;
	this.parser = parser;
	this.parsingMode = parsingMode;
	this.nefAction = nefAction;
	if (writingMode == WritingMode.APPEND) {
		this.openOptions = new OpenOption[]{WRITE, CREATE};
	} else {
		this.openOptions = new OpenOption[]{WRITE, CREATE, TRUNCATE_EXISTING};
	}
	this.writeCompletedHandler = new WriteCompletedHandler();
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
/**
 * 報告書をCSVファイルに書き込む
 *
 * @param path ファイル
 * @param header ヘッダー
 * @param body 內容
 * @param applend 追記フラグ
 * @throws IOException
 */
public static void writeCsv(Path path, String[] header, List<String[]> body, boolean applend)
        throws IOException {
    OpenOption[] options;
    if (applend) {
        options = new OpenOption[] { StandardOpenOption.CREATE, StandardOpenOption.APPEND };
    } else {
        options = new OpenOption[] { StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING };
    }
    try (OutputStream out = new BufferedOutputStream(Files.newOutputStream(path, options))) {
        if (!Files.exists(path) || (Files.size(path) <= 0)) {
            out.write(StringUtils.join(header, ',').getBytes(AppConstants.CHARSET));
            out.write("\r\n".getBytes(AppConstants.CHARSET));
        }
        for (String[] colums : body) {
            out.write(StringUtils.join(colums, ',').getBytes(AppConstants.CHARSET));
            out.write("\r\n".getBytes(AppConstants.CHARSET));
        }
    }
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
private long writeContent(byte[] content, HTTPEnvRequest env, OpenOption... openOptions)
{
    content = env.getSettings()
            .getFileManager()
            .getProperty(
                    IContentMutation.class,
                    "local::content::mutation",
                    NoContentMutation.getInstance())
            .transform(content, this, env);
    
    try
    {
        Files.write(getPhysicalFile(env).toPath(), content, openOptions);
    }
    catch (IOException ex)
    {
        throw new UnexpectedException(ex);
    }
    
    this.lastModified = Instant.now();
    return content.length;
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
public FileChannel getSaveFileChannel(String fileName) {		
	FileDialog fd = new FileDialog(shlSimpleChatExample, SWT.SAVE);
       fd.setText("Choose a file for the incoming file transfer");
       fd.setFileName(fileName);
       String selected = fd.open();
       Path path = FileSystems.getDefault().getPath(selected);
       OpenOption[] read = { StandardOpenOption.WRITE, StandardOpenOption.CREATE_NEW };
       try {
       	System.out.println("File will be saved to: "+path);
		FileChannel fileChannel = FileChannel.open(path, read);

		return fileChannel;
       } catch (IOException e) {
		e.printStackTrace();
	}
       
       return null;
}
 

import java.nio.file.OpenOption; //導入依賴的package包/類
@Override
public void startup() {
    this.fileSystem = FileSystems.getDefault();
    this.provider = fileSystem.provider();
    this.readOptions = new HashSet<OpenOption>();
    this.readOptions.add(StandardOpenOption.READ);
    this.readOptions.add(StandardOpenOption.SYNC);
    
    try {
    	int i = inputPathString.length;
    	fileChannel = new FileChannel[i];
    	while (--i>=0) {
    		fileChannel[i] = provider.newFileChannel(fileSystem.getPath(inputPathString[i]), readOptions);
    	}
    } catch (IOException e) {
       throw new RuntimeException(e);
    } 
}