Example usage for org.apache.commons.vfs2 RandomAccessContent seek

Introduction

In this page you can find the example usage for org.apache.commons.vfs2 RandomAccessContent seek.

Prototype

void seek(long pos) throws IOException;

Source Link

Document

Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.

Usage

From source file:org.freedesktop.mime.MagicEntry.java

public boolean match(FileObject file) throws IOException {
    RandomAccessContent s = file.getContent().getRandomAccessContent(RandomAccessMode.READ);
    try {//from w w  w.  j  a va 2s.  co m
        for (Pattern p : this) {

            byte[] val = p.getValue();
            byte[] mask = p.getMask();

            // Read in portion of file
            ByteBuffer buf = ByteBuffer.allocate(p.getRangeLength() + val.length);
            s.seek(p.getOffset());
            byte[] bufArr = buf.array();
            s.readFully(bufArr);

            int valIdx = 0;
            for (int i = 0; i < bufArr.length; i++) {
                if ((bufArr[i] & mask[valIdx]) == (val[valIdx] & mask[valIdx])) {
                    valIdx++;
                    if (valIdx == val.length) {
                        return true;
                    }
                } else {
                    valIdx = 0;
                }
            }
        }
    } finally {
        s.close();
    }
    return false;
}

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From source file:pl.otros.logview.api.io.Utils.java

public static void reloadFileObject(LoadingInfo loadingInfo) throws IOException {
    loadingInfo.getFileObject().refresh();
    long lastFileSize = loadingInfo.getLastFileSize();
    long currentSize = loadingInfo.getFileObject().getContent().getSize();
    if (currentSize > lastFileSize) {
        IOUtils.closeQuietly(loadingInfo.getObserableInputStreamImpl());

        RandomAccessContent randomAccessContent = loadingInfo.getFileObject().getContent()
                .getRandomAccessContent(RandomAccessMode.READ);
        randomAccessContent.seek(lastFileSize);
        loadingInfo.setLastFileSize(currentSize);
        ObservableInputStreamImpl observableStream = new ObservableInputStreamImpl(
                randomAccessContent.getInputStream(), lastFileSize);
        loadingInfo.setObserableInputStreamImpl(observableStream);
        if (loadingInfo.isGziped()) {
            loadingInfo.setContentInputStream(new GZIPInputStream(observableStream));
        } else {//www.j  a  v  a2 s  . c o  m
            loadingInfo.setContentInputStream(observableStream);
        }
    } else if (currentSize < lastFileSize) {
        IOUtils.closeQuietly(loadingInfo.getObserableInputStreamImpl());
        InputStream inputStream = loadingInfo.getFileObject().getContent().getInputStream();
        ObservableInputStreamImpl observableStream = new ObservableInputStreamImpl(inputStream, 0);
        loadingInfo.setObserableInputStreamImpl(observableStream);
        if (loadingInfo.isGziped()) {
            loadingInfo.setContentInputStream(new GZIPInputStream(observableStream));
        } else {
            loadingInfo.setContentInputStream(observableStream);
        }
        loadingInfo.setLastFileSize(loadingInfo.getFileObject().getContent().getSize());
    }

}

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From source file:pl.otros.logview.io.Utils.java

public static void reloadFileObject(LoadingInfo loadingInfo) throws IOException {
    loadingInfo.getFileObject().refresh();
    long lastFileSize = loadingInfo.getLastFileSize();
    long currentSize = loadingInfo.getFileObject().getContent().getSize();
    if (currentSize > lastFileSize) {
        IOUtils.closeQuietly(loadingInfo.getObserableInputStreamImpl());

        RandomAccessContent randomAccessContent = loadingInfo.getFileObject().getContent()
                .getRandomAccessContent(RandomAccessMode.READ);
        randomAccessContent.seek(lastFileSize);
        loadingInfo.setLastFileSize(currentSize);
        ObservableInputStreamImpl observableStream = new ObservableInputStreamImpl(
                randomAccessContent.getInputStream());
        loadingInfo.setObserableInputStreamImpl(observableStream);
        if (loadingInfo.isGziped()) {
            loadingInfo.setContentInputStream(new GZIPInputStream(observableStream));
        } else {/*from w  w  w. j av  a2s  .  c  o m*/
            loadingInfo.setContentInputStream(observableStream);
        }
    } else if (currentSize < lastFileSize) {
        IOUtils.closeQuietly(loadingInfo.getObserableInputStreamImpl());
        InputStream inputStream = loadingInfo.getFileObject().getContent().getInputStream();
        ObservableInputStreamImpl observableStream = new ObservableInputStreamImpl(inputStream);
        loadingInfo.setObserableInputStreamImpl(observableStream);
        if (loadingInfo.isGziped()) {
            loadingInfo.setContentInputStream(new GZIPInputStream(observableStream));
        } else {
            loadingInfo.setContentInputStream(observableStream);
        }
        loadingInfo.setLastFileSize(loadingInfo.getFileObject().getContent().getSize());
    }

}

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