Example usage for org.apache.commons.vfs2 FileObject exists

Introduction

In this page you can find the example usage for org.apache.commons.vfs2 FileObject exists.

Prototype

boolean exists() throws FileSystemException;

Source Link

Document

Determines if this file exists.

Usage

From source file:org.renjin.primitives.files.Files.java

private static int checkAccess(FileObject file, int mode) throws FileSystemException {

    boolean ok = true;
    if ((mode & CHECK_ACCESS_EXISTENCE) != 0 && !file.exists()) {
        ok = false;/*from   ww  w .j  a  v  a  2 s  . c  om*/
    }

    if ((mode & CHECK_ACCESS_READ) != 0 && !file.isReadable()) {
        ok = false;
    }

    if ((mode & CHECK_ACCESS_WRITE) != 0 & !file.isWriteable()) {
        ok = false;
    }

    //case CHECK_ACCESS_EXECUTE:
    //      return -1; // don't know if this is possible to check with VFS
    //  }
    return ok ? 0 : -1;
}

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From source file:org.renjin.primitives.files.Files.java

/**
 * Utility function to extract information about files on the user's file systems.
 *
 * @param context  current call Context//  w w  w .  j a v a  2s . com
 * @param paths the list of files for which to return information
 * @return list column-oriented table of file information
 * @throws FileSystemException
 */
@Internal("file.info")
public static ListVector fileInfo(@Current Context context, StringVector paths) throws FileSystemException {

    DoubleArrayVector.Builder size = new DoubleArrayVector.Builder();
    LogicalArrayVector.Builder isdir = new LogicalArrayVector.Builder();
    IntArrayVector.Builder mode = (IntArrayVector.Builder) new IntArrayVector.Builder()
            .setAttribute(Symbols.CLASS, StringVector.valueOf("octmode"));
    DoubleArrayVector.Builder mtime = new DoubleArrayVector.Builder();
    StringVector.Builder exe = new StringVector.Builder();

    for (String path : paths) {
        if (StringVector.isNA(path)) {
            throw new EvalException("invalid filename argument");
        }
        FileObject file = context.resolveFile(path);
        if (file.exists()) {
            if (file.getType() == FileType.FILE) {
                size.add((int) file.getContent().getSize());
            } else {
                size.add(0);
            }
            isdir.add(file.getType() == FileType.FOLDER);
            mode.add(mode(file));
            try {
                mtime.add(file.getContent().getLastModifiedTime());
            } catch (Exception e) {
                mtime.add(0);
            }
            exe.add(file.getName().getBaseName().endsWith(".exe") ? "yes" : "no");
        } else {
            size.addNA();
            isdir.addNA();
            mode.addNA();
            mtime.addNA();
            exe.addNA();
        }
    }

    return ListVector.newNamedBuilder().add("size", size).add("isdir", isdir).add("mode", mode)
            .add("mtime", mtime).add("ctime", mtime).add("atime", mtime).add("exe", exe).build();
}

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From source file:org.renjin.primitives.files.Files.java

@Invisible
@Internal//  w  ww . ja v  a2  s . c o m
public static String setwd(@Current Context context, String workingDirectoryName) throws FileSystemException {
    FileObject newWorkingDirectory = context.resolveFile(workingDirectoryName);
    if (!newWorkingDirectory.exists() || newWorkingDirectory.getType() != FileType.FOLDER) {
        throw new EvalException("cannot change working directory");
    }

    String previous = context.getSession().getWorkingDirectory().getName().getURI();

    context.getSession().setWorkingDirectory(newWorkingDirectory);
    return previous;
}

---

From source file:org.renjin.primitives.files.Files.java

private static void delete(FileObject file, boolean recursive) throws FileSystemException {
    if (file.exists()) {
        if (file.getType() == FileType.FILE) {
            file.delete();//from  ww w. j  a  v  a2  s. c o  m
        } else if (file.getType() == FileType.FOLDER) {
            if (file.getChildren().length == 0) {
                file.delete();
            } else if (recursive) {
                file.delete();
            }
        }
    }
}

---

From source file:org.renjin.primitives.files.Files.java

/**
 * Helper function to extract a zip entry to the given folder.
 *///from  w w  w.  j  ava  2  s.  co  m
private static void unzipExtract(ZipInputStream zin, ZipEntry entry, FileObject exdir, boolean junkpaths,
        boolean overwrite) throws IOException {
    if (junkpaths) {
        throw new EvalException("unzip(junpaths=false) not yet implemented");
    }

    FileObject exfile = exdir.resolveFile(entry.getName());
    if (exfile.exists() && !overwrite) {
        throw new EvalException("file to be extracted '%s' already exists", exfile.getName().getURI());
    }
    OutputStream out = exfile.getContent().getOutputStream();
    try {

        byte buffer[] = new byte[64 * 1024];
        int bytesRead;
        while ((bytesRead = zin.read(buffer)) != -1) {
            out.write(buffer, 0, bytesRead);
        }
    } finally {
        out.close();
    }
}

---

From source file:org.renjin.primitives.files.Files.java

/**
 *  file.append attempts to append the files named by its second
 * argument to those named by its first.  The R subscript recycling
 * rule is used to align names given in vectors of different lengths.
 *///  w  w  w . ja  va2  s.  com
@Internal("file.append")
@DataParallel
public static boolean fileAppend(@Current Context context, String destFileName, String sourceFileName) {
    try {
        FileObject sourceFile = context.resolveFile(sourceFileName);
        if (!sourceFile.exists()) {
            return false;
        }
        FileObject destFile = context.resolveFile(destFileName);
        OutputStream out = destFile.getContent().getOutputStream(true);
        try {
            InputStream in = sourceFile.getContent().getInputStream();
            try {
                ByteStreams.copy(in, out);
            } finally {
                try {
                    in.close();
                } catch (Exception ignored) {
                }
            }
        } finally {
            try {
                out.close();
            } catch (Exception ignored) {
            }
        }
        return true;
    } catch (Exception e) {
        return false;
    }
}

---

From source file:org.wso2.carbon.connector.FileAppend.java

/**
 * @param destination    Location if the file
 * @param content        Content that is going to be added
 * @param encoding       Encoding type//from   w  ww .jav  a2  s  .  c o m
 * @param messageContext The message context that is generated for processing the file
 * @return true/false
 */
private boolean appendFile(String destination, String content, String encoding, MessageContext messageContext) {
    OutputStream out = null;
    boolean resultStatus = false;
    FileObject fileObj = null;
    StandardFileSystemManager manager = null;
    try {
        manager = FileConnectorUtils.getManager();
        fileObj = manager.resolveFile(destination, FileConnectorUtils.init(messageContext));
        if (!fileObj.exists()) {
            fileObj.createFile();
        }
        out = fileObj.getContent().getOutputStream(true);
        if (StringUtils.isEmpty(encoding)) {
            IOUtils.write(content, out, DEFAULT_ENCODING);
        } else {
            IOUtils.write(content, out, encoding);
        }
        resultStatus = true;

        if (log.isDebugEnabled()) {
            log.debug("File appending completed. " + destination);
        }
    } catch (IOException e) {
        handleException("Error while appending a file.", e, messageContext);
    } finally {
        try {
            if (fileObj != null) {
                //close the file object
                fileObj.close();
            }
        } catch (FileSystemException e) {
            log.error("Error while closing FileObject: " + e.getMessage(), e);
        }
        try {
            if (out != null) {
                //close the output stream
                out.close();
            }
        } catch (IOException e) {
            log.error("Error while closing OutputStream: " + e.getMessage(), e);
        }
        if (manager != null) {
            //close the StandardFileSystemManager
            manager.close();
        }
    }
    return resultStatus;
}

---

From source file:org.wso2.carbon.connector.FileAppendConnector.java

/**
 * Add the content into file./*from   ww  w  . j  a  va 2s . c o m*/
 *
 * @param messageContext The message context that is generated for processing the file.
 * @return true, if the content is successfully appended.
 * @throws FileSystemException On error parsing the file name, determining if the file exists and creating the
 * file.
 */
private boolean appendFile(MessageContext messageContext) throws FileSystemException {
    String destination = (String) ConnectorUtils.lookupTemplateParamater(messageContext,
            FileConstants.NEW_FILE_LOCATION);
    String content = (String) ConnectorUtils.lookupTemplateParamater(messageContext, FileConstants.CONTENT);
    String encoding = (String) ConnectorUtils.lookupTemplateParamater(messageContext, FileConstants.ENCODING);
    if (StringUtils.isEmpty(encoding)) {
        encoding = FileConstants.DEFAULT_ENCODING;
    }
    FileSystemOptions opts = FileConnectorUtils.init(messageContext);
    OutputStream out = null;
    FileObject fileObj = null;
    StandardFileSystemManager manager = FileConnectorUtils.getManager();
    try {
        fileObj = manager.resolveFile(destination, opts);
        if (!fileObj.exists()) {
            fileObj.createFile();
        }
        // True, if the content should be appended.
        out = fileObj.getContent().getOutputStream(true);
        IOUtils.write(content, out, encoding);
        if (log.isDebugEnabled()) {
            log.debug("File appending completed. " + destination);
        }
    } catch (IOException e) {
        throw new SynapseException("Error while appending content", e);
    } finally {
        try {
            if (fileObj != null) {
                // close the file object
                fileObj.close();
            }
        } catch (FileSystemException e) {
            log.error("Error while closing FileObject", e);
        }
        try {
            if (out != null) {
                // close the output stream
                out.close();
            }
        } catch (IOException e) {
            log.error("Error while closing OutputStream", e);
        }
        // close the StandardFileSystemManager
        manager.close();
    }
    return true;
}

---

From source file:org.wso2.carbon.connector.FileArchiveConnector.java

/**
 * Archive a file/folder./*from   ww  w  .  j  a  v a2s.  com*/
 *
 * @param messageContext The message context that is generated for processing the file.
 * @return return true, if the file/folder is successfully archived, false, if not.
 * @throws FileSystemException On error parsing the file name, determining if the file exists and getting file type.
 */
private boolean fileCompress(MessageContext messageContext) throws FileSystemException {
    String source = (String) ConnectorUtils.lookupTemplateParamater(messageContext,
            FileConstants.FILE_LOCATION);
    String destination = (String) ConnectorUtils.lookupTemplateParamater(messageContext,
            FileConstants.NEW_FILE_LOCATION);
    StandardFileSystemManager manager = FileConnectorUtils.getManager();
    FileSystemOptions opts = FileConnectorUtils.init(messageContext);
    FileObject fileObj = manager.resolveFile(source, opts);
    FileObject destObj = manager.resolveFile(destination, opts);
    if (!fileObj.exists()) {
        log.error("The File location does not exist.");
        return false;
    }
    if (FileType.FOLDER.equals(fileObj.getType())) {
        List<FileObject> fileList = new ArrayList<>();
        addAllFilesToList(fileObj, fileList);
        writeZipFiles(fileObj, destObj, fileList);
    } else {
        ZipOutputStream outputStream = null;
        InputStream fileIn = null;
        try {
            outputStream = new ZipOutputStream(destObj.getContent().getOutputStream());
            fileIn = fileObj.getContent().getInputStream();
            ZipEntry zipEntry = new ZipEntry(fileObj.getName().getBaseName());
            outputStream.putNextEntry(zipEntry);
            int length;
            while ((length = fileIn.read(bytes)) != -1) {
                outputStream.write(bytes, 0, length);
            }
        } catch (IOException e) {
            throw new SynapseException("Error while writing an array of bytes to the ZipOutputStream", e);
        } finally {
            try {
                // close the file object
                fileObj.close();
            } catch (FileSystemException e) {
                log.error("Error while closing the source FileObject", e);
            }
            try {
                // close the file object
                destObj.close();
            } catch (FileSystemException e) {
                log.error("Error while closing the destination FileObject", e);
            }
            try {
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (IOException e) {
                log.error("Error while closing ZipOutputStream", e);
            }
            try {
                if (fileIn != null) {
                    fileIn.close();
                }
            } catch (IOException e) {
                log.error("Error while closing InputStream:", e);
            }
            // close the StandardFileSystemManager
            manager.close();
        }
    }
    if (log.isDebugEnabled()) {
        log.debug("File archiving completed." + destination);
    }
    return true;
}

---

From source file:org.wso2.carbon.connector.FileArchives.java

/**
 * @param messageContext The message context that is generated for processing the file
 * @param source         The file to be archived
 * @param destination    Destination of the archived file
 * @return return status/*from ww  w  .j  ava 2  s  .co  m*/
 * @throws SynapseException
 */
private boolean fileCompress(MessageContext messageContext, String source, String destination) {
    boolean resultStatus = false;
    StandardFileSystemManager manager;
    FileSystemOptions opts = FileConnectorUtils.init(messageContext);
    try {
        manager = FileConnectorUtils.getManager();
        FileObject fileObj = manager.resolveFile(source, opts);
        FileObject destObj = manager.resolveFile(destination, opts);
        if (fileObj.exists()) {
            if (fileObj.getType() == FileType.FOLDER) {
                List<FileObject> fileList = new ArrayList<FileObject>();
                getAllFiles(fileObj, fileList, messageContext);
                writeZipFiles(fileObj, destObj, fileList, messageContext);
            } else {
                ZipOutputStream outputStream = null;
                InputStream fileIn = null;
                try {
                    outputStream = new ZipOutputStream(destObj.getContent().getOutputStream());
                    fileIn = fileObj.getContent().getInputStream();
                    ZipEntry zipEntry = new ZipEntry(fileObj.getName().getBaseName());
                    outputStream.putNextEntry(zipEntry);
                    int length;
                    while ((length = fileIn.read(bytes)) != -1) {
                        outputStream.write(bytes, 0, length);
                    }
                } catch (Exception e) {
                    log.error("Unable to compress a file." + e.getMessage());
                } finally {
                    try {
                        if (outputStream != null) {
                            outputStream.close();
                        }
                    } catch (IOException e) {
                        log.error("Error while closing ZipOutputStream: " + e.getMessage(), e);
                    }
                    try {
                        if (fileIn != null) {
                            fileIn.close();
                        }
                    } catch (IOException e) {
                        log.error("Error while closing InputStream: " + e.getMessage(), e);
                    }
                    manager.close();
                }
            }
            resultStatus = true;

            if (log.isDebugEnabled()) {
                log.debug("File archiving completed." + destination);
            }
        } else {
            log.error("The File location does not exist.");
            resultStatus = false;
        }
    } catch (IOException e) {
        handleException("Unable to process the zip file", e, messageContext);
    }
    return resultStatus;
}

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