Example usage for java.io FileInputStream getChannel

Introduction

In this page you can find the example usage for java.io FileInputStream getChannel.

Prototype

public FileChannel getChannel() 

Source Link

Document

Returns the unique java.nio.channels.FileChannel FileChannel object associated with this file input stream.

Usage

From source file:org.gdms.driver.dbf.DBFDriver.java

@Override
public void open() throws DriverException {
    LOG.trace("Opening file");
    try {//from  w  ww  .j  a  v a 2  s  .c o m
        FileInputStream fis = new FileInputStream(file);
        dbaseReader = new DbaseFileReader(fis.getChannel());
        loadInternalMetadata();
    } catch (IOException e) {
        throw new DriverException(e);
    }
}

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From source file:com.frostwire.util.MP4Muxer.java

public void mux(String video, String audio, String output, final MP4Metadata mt) throws IOException {

    FileInputStream videoIn = new FileInputStream(video);
    FileInputStream audioIn = new FileInputStream(audio);

    try {/*  w w w.jav a  2  s  . c o m*/
        FileChannel videoChannel = videoIn.getChannel();
        Movie videoMovie = buildMovie(videoChannel);

        FileChannel audioChannel = audioIn.getChannel();
        Movie audioMovie = buildMovie(audioChannel);

        Movie outMovie = new Movie();

        for (Track trk : videoMovie.getTracks()) {
            outMovie.addTrack(trk);
        }

        for (Track trk : audioMovie.getTracks()) {
            outMovie.addTrack(trk);
        }

        Container out = new DefaultMp4Builder() {
            @Override
            protected FileTypeBox createFileTypeBox(Movie movie) {
                List<String> minorBrands = new LinkedList<String>();
                minorBrands.add("iso6");
                minorBrands.add("avc1");
                minorBrands.add("mp41");
                minorBrands.add("\0\0\0\0");

                return new FileTypeBox("MP4 ", 0, minorBrands);
            }

            @Override
            protected MovieBox createMovieBox(Movie movie, Map<Track, int[]> chunks) {
                MovieBox moov = super.createMovieBox(movie, chunks);
                moov.getMovieHeaderBox().setVersion(0);
                return moov;
            }

            @Override
            protected TrackBox createTrackBox(Track track, Movie movie, Map<Track, int[]> chunks) {
                TrackBox trak = super.createTrackBox(track, movie, chunks);

                trak.getTrackHeaderBox().setVersion(0);
                trak.getTrackHeaderBox().setVolume(1.0f);

                return trak;
            }

            @Override
            protected Box createUdta(Movie movie) {
                return mt != null ? addUserDataBox(mt) : null;
            }
        }.build(outMovie);

        FileOutputStream fos = new FileOutputStream(output);
        try {
            out.writeContainer(fos.getChannel());
        } finally {
            IOUtils.closeQuietly(fos);
        }
    } finally {
        IOUtils.closeQuietly(videoIn);
        IOUtils.closeQuietly(audioIn);
    }
}

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From source file:com.yahoo.glimmer.indexing.preprocessor.ResourceRecordWriterTest.java

@Test
public void writeSubjectAndObjectTest() throws IOException, InterruptedException, ClassNotFoundException {
    ByteArrayOutputStream bySubjectBos = new ByteArrayOutputStream(1024);
    FSDataOutputStream bySubjectOs = new FSDataOutputStream(bySubjectBos, null);
    ByteArrayOutputStream bySubjectOffsetsBos = new ByteArrayOutputStream(1024);
    FSDataOutputStream bySubjectOffsetsOs = new FSDataOutputStream(bySubjectOffsetsBos, null);

    e.one(fs).create(e.with(new Path(tempDirPath, "bySubject.bz2")), e.with(false));
    e.will(Expectations.returnValue(bySubjectOs));
    e.one(fs).create(e.with(new Path(tempDirPath, "bySubject.blockOffsets")), e.with(false));
    e.will(Expectations.returnValue(bySubjectOffsetsOs));

    e.one(allOs).write(e.with(new ByteMatcher("http://a/key1\nhttp://a/key2\nhttp://a/key3\n", true)),
            e.with(0), e.with(42));//w  w w  .j  a va 2 s  .  c  o m
    e.one(contextOs).write(e.with(new ByteMatcher("http://a/key\n", true)), e.with(0), e.with(13));
    e.one(objectOs).write(e.with(new ByteMatcher("http://a/key\nbNode123\n", true)), e.with(0), e.with(22));
    e.one(predicateOs).write(e.with(new ByteMatcher("3\thttp://a/key\n", true)), e.with(0), e.with(15));
    e.one(subjectOs).write(e.with(new ByteMatcher("http://a/key\n", true)), e.with(0), e.with(13));

    context.checking(e);

    ResourceRecordWriter writer = new ResourceRecordWriter(fs, tempDirPath, null);

    OutputCount outputCount = new OutputCount();
    outputCount.output = OUTPUT.PREDICATE;
    outputCount.count = 3;
    writer.write(new Text("http://a/key"), outputCount);
    outputCount.output = OUTPUT.OBJECT;
    outputCount.count = 0;
    writer.write(new Text("http://a/key"), outputCount);
    outputCount.output = OUTPUT.CONTEXT;
    outputCount.count = 0;
    writer.write(new Text("http://a/key"), outputCount);
    outputCount.output = OUTPUT.ALL;
    outputCount.count = 0;
    writer.write(new Text("http://a/key1"), outputCount);
    writer.write(new Text("http://a/key2"), outputCount);
    writer.write(new Text("http://a/key3"), outputCount);
    BySubjectRecord record = new BySubjectRecord();
    record.setId(66);
    record.setPreviousId(55);
    record.setSubject("http://a/key");
    record.addRelation("<http://predicate/> <http://Object> .");
    writer.write(new Text("http://a/key"), record);
    outputCount.output = OUTPUT.OBJECT;
    outputCount.count = 0;
    writer.write(new Text("bNode123"), outputCount);
    writer.close(null);

    context.assertIsSatisfied();

    BlockCompressedDocumentCollection collection = new BlockCompressedDocumentCollection("foo", null, 10);
    InputStream blockOffsetsInputStream = new ByteArrayInputStream(bySubjectOffsetsBos.toByteArray());

    File bySubjectTempFile = File.createTempFile(ResourceRecordWriterTest.class.getSimpleName(), "tmp");
    FileOutputStream tempFileOutputStream = new FileOutputStream(bySubjectTempFile);
    bySubjectBos.writeTo(tempFileOutputStream);
    tempFileOutputStream.flush();
    tempFileOutputStream.close();

    FileInputStream bySubjectFileInputStream = new FileInputStream(bySubjectTempFile);
    collection.init(bySubjectFileInputStream.getChannel(), blockOffsetsInputStream, 100000);
    blockOffsetsInputStream.close();

    // Size of collection. This is the same as the number of lines written to ALL.
    assertEquals(3l, collection.size());

    InputStream documentInputStream = collection.stream(65l);
    assertEquals(-1, documentInputStream.read());
    documentInputStream = collection.stream(67l);
    assertEquals(-1, documentInputStream.read());
    documentInputStream = collection.stream(66l);
    assertNotNull(documentInputStream);

    collection.close();
    bySubjectFileInputStream.close();
}

---

From source file:pyromaniac.IO.MMFastqImporter.java

/**
 * Helper function for init(). Scans this.fastq file for sequence starts and records their position.
 * Multiple MappedByteBuffers are used to handle large files.
 * @throws Exceptions relating to file reading and decoding.
 *///w  w w .j a  v a2  s.  c o m
private void _initFile() throws Exception {
    FileInputStream tempStream = new FileInputStream(new File(this.fastqFile));
    FileChannel fcSeq = tempStream.getChannel();
    this.seqSizeLong = fcSeq.size();
    this.recordStarts = new ArrayList<Pair<Integer, Long>>();

    int state = -1;

    for (long startPosition = 0L; startPosition < this.seqSizeLong; startPosition += HALF_GIGA) {
        MappedByteBuffer recordBuffer = fcSeq.map(FileChannel.MapMode.READ_ONLY, startPosition,
                Math.min(this.seqSizeLong - startPosition, HALF_GIGA));
        this.recordBuffers.add(recordBuffer);

        int sbf_pos = this.recordBuffers.size() - 1;

        int maxBuffer = 2048;
        int bufferSize = (recordBuffer.capacity() > maxBuffer) ? maxBuffer : recordBuffer.capacity();

        recordBuffer.limit(bufferSize);
        recordBuffer.position(0);

        while (recordBuffer.position() != recordBuffer.capacity()) {
            int prevPos = recordBuffer.position();
            CharBuffer result = decoder.decode(recordBuffer);
            recordBuffer.position(prevPos);

            for (int i = 0; i < result.capacity(); i++) {
                char curr = result.charAt(i);
                int posInFile = prevPos + i;

                //I see a fastq header, I am either at beginning of file, or last saw the quality line...
                if (curr == BEGINNING_FASTQ_SEQ && (state == -1 || state == 4)) {
                    this.recordStarts.add(new Pair<Integer, Long>(sbf_pos, new Long(posInFile)));
                    state = 1;

                } else if (curr == BEGINNING_FASTQ_QUAL && (state == 1)) {
                    state = 2;
                } else if ((curr == '\n' || curr == '\r') & state == 2) {
                    state = 3;
                } else if ((curr == '\n' || curr == '\r') & state == 3) {
                    state = 4;
                }
            }

            int newPos = recordBuffer.limit();

            if (recordBuffer.limit() + bufferSize > recordBuffer.capacity())
                recordBuffer.limit(recordBuffer.capacity());
            else
                recordBuffer.limit(recordBuffer.limit() + bufferSize);
            recordBuffer.position(newPos);
        }
        recordBuffer.rewind();
    }
}

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From source file:org.meerkat.util.FileUtil.java

/**
 * readFileContents//from w  w w. j ava  2 s .  com
 * 
 * @param filename
 * @return file contents
 */
public final String readFileContents(String filePath) {
    FileInputStream stream = null;
    String contents = "";
    try {
        stream = new FileInputStream(new File(filePath));
    } catch (Exception e) {
        log.error("File not found: " + filePath, e);
    }
    try {
        FileChannel fc = stream.getChannel();
        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
        /* Instead of using default, pass in a decoder. */
        contents = Charset.defaultCharset().decode(bb).toString();
    } catch (IOException e) {
        log.error("Error streaming file contents: " + filePath, e);

    } finally {
        try {
            stream.close();
        } catch (IOException e) {
            log.error("Error closing file stream: " + filePath, e);

        }
    }
    return contents;
}

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From source file:org.h819.commons.file.MyPDFUtilss.java

/**
 *  PdfReader ? pdf  pdf ???/*w ww  . j av  a2s  . c  o m*/
 *
 * @param pdfFile ? pdf 
 * @return PdfReader 
 * @throws IOException
 */
public static PdfReader getPdfReader(File pdfFile) throws IOException {

    Document.plainRandomAccess = true;
    FileInputStream fileStream = new FileInputStream(pdfFile);
    return new PdfReader(
            new RandomAccessFileOrArray(new FileChannelRandomAccessSource(fileStream.getChannel())), null);

}

---

From source file:org.opennms.systemreport.AbstractSystemReportPlugin.java

protected String slurp(final File lsb) {
    if (lsb != null && lsb.exists()) {
        FileInputStream stream = null;
        try {//  ww w.  java 2s. c o  m
            stream = new FileInputStream(lsb);
            FileChannel fc = stream.getChannel();
            MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
            return Charset.defaultCharset().decode(bb).toString().replace("[\\r\\n]*$", "");
        } catch (final Exception e) {
            LOG.debug("Unable to read from file '{}'", lsb.getPath(), e);
        } finally {
            IOUtils.closeQuietly(stream);
        }
    }
    return null;
}

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From source file:edu.rit.flick.genetics.FastFileDeflator.java

protected void createOutputFiles(final File fastFile, final String tempOutputDirectory) throws IOException {
    datahcf = ByteBufferOutputStream.map(new File(tempOutputDirectory + SEQUENCE_DATA_FILE), MapMode.READ_WRITE,
            (long) (fastFile.length() * EXPECTED_COMPRESSION_RATIO));
    nfile = ByteBufferOutputStream.map(new File(tempOutputDirectory + N_FILE), MapMode.READ_WRITE,
            (long) (fastFile.length() * EXPECTED_COMPRESSION_RATIO * 2));
    headerfile = new BufferedOutputStream(new FileOutputStream(tempOutputDirectory + SEQUENCE_ID_FILE),
            DEFAULT_BUFFER);/* w w w  .  j  a  v  a2  s  . c  o m*/
    iupacfile = new BufferedOutputStream(new FileOutputStream(tempOutputDirectory + IUPAC_CODE_FILE),
            DEFAULT_BUFFER);
    tailfile = new BufferedOutputStream(new FileOutputStream(tempOutputDirectory + SEQUENCE_TAIL_FILE),
            DEFAULT_BUFFER);
    metafile = new FileWriter(new File(tempOutputDirectory + META_FILE));

    metafile.write(format(META_FILE_SIZE_FORMAT, fastFile.length()));

    final FileInputStream fastFis = new FileInputStream(fastFile);
    fastIn = ByteBufferInputStream.map(fastFis.getChannel());

    fastFis.close();
}

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From source file:org.apache.pig.data.SchemaTupleBackend.java

private void copyAllFromDistributedCache() throws IOException {
    String toDeserialize = jConf.get(PigConstants.GENERATED_CLASSES_KEY);
    if (toDeserialize == null) {
        LOG.info("No classes in in key [" + PigConstants.GENERATED_CLASSES_KEY
                + "] to copy from distributed cache.");
        return;/*from w  w  w . java 2s  . com*/
    }
    LOG.info("Copying files in key [" + PigConstants.GENERATED_CLASSES_KEY + "] from distributed cache: "
            + toDeserialize);
    for (String s : toDeserialize.split(",")) {
        LOG.info("Attempting to read file: " + s);
        // The string is the symlink into the distributed cache
        File src = new File(s);
        FileInputStream fin = null;
        FileOutputStream fos = null;
        try {
            fin = new FileInputStream(src);
            fos = new FileOutputStream(new File(codeDir, s));

            fin.getChannel().transferTo(0, src.length(), fos.getChannel());
            LOG.info("Successfully copied file to local directory.");
        } finally {
            if (fin != null) {
                fin.close();
            }
            if (fos != null) {
                fos.close();
            }
        }
    }
}

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