Example usage for java.io RandomAccessFile setLength

Introduction

In this page you can find the example usage for java.io RandomAccessFile setLength.

Prototype

public native void setLength(long newLength) throws IOException;

Source Link

Document

Sets the length of this file.

Usage

From source file:org.apache.pig.test.TestJobControlCompiler.java

public static POLoad createPOLoadWithSize(long size, LoadFunc loadFunc) throws Exception {
    File file = File.createTempFile("tempFile", ".tmp");
    file.deleteOnExit();/* w w w  . j  a  va 2  s.c  o m*/
    RandomAccessFile f = new RandomAccessFile(file, "rw");
    f.setLength(size);
    f.close();

    loadFunc.setLocation(file.getAbsolutePath(), new org.apache.hadoop.mapreduce.Job(CONF));
    FuncSpec funcSpec = new FuncSpec(loadFunc.getClass().getCanonicalName());
    POLoad poLoad = new POLoad(new OperatorKey(), loadFunc);
    poLoad.setLFile(new FileSpec(file.getAbsolutePath(), funcSpec));
    poLoad.setPc(new PigContext());
    poLoad.setUp();

    return poLoad;
}

---

From source file:org.nuxeo.ecm.core.blob.binary.LocalBinaryManager.java

/**
 * Sets the last modification date to now on a file
 *
 * @param file the file/*w  w w .java2s. c o m*/
 */
public static void touch(File file) {
    long time = System.currentTimeMillis();
    if (file.setLastModified(time)) {
        // ok
        return;
    }
    if (!file.canWrite()) {
        // cannot write -> stop won't be able to delete anyway
        return;
    }
    try {
        // Windows: the file may be open for reading
        // workaround found by Thomas Mueller, see JCR-2872
        RandomAccessFile r = new RandomAccessFile(file, "rw");
        try {
            r.setLength(r.length());
        } finally {
            r.close();
        }
    } catch (IOException e) {
        log.error("Cannot set last modified for file: " + file, e);
    }
}

---

From source file:org.apache.hadoop.dfs.TestDatanodeBlockScanner.java

private static void truncateReplica(String blockName, int dnIndex) throws IOException {
    File baseDir = new File(System.getProperty("test.build.data"), "dfs/data");
    for (int i = dnIndex * 2; i < dnIndex * 2 + 2; i++) {
        File blockFile = new File(baseDir, "data" + (i + 1) + "/current/" + blockName);
        if (blockFile.exists()) {
            RandomAccessFile raFile = new RandomAccessFile(blockFile, "rw");
            raFile.setLength(raFile.length() - 1);
            raFile.close();/*from w  w w.j av a 2  s. co m*/
            break;
        }
    }
}

---

From source file:org.apache.hadoop.hdfs.TestDatanodeBlockScanner.java

/**
 * Change the length of a block at datanode dnIndex
 *///from  w  ww.ja v a2 s .  co m
static boolean changeReplicaLength(String blockName, int dnIndex, int lenDelta) throws IOException {
    File baseDir = new File(System.getProperty("test.build.data"), "dfs/data");
    for (int i = dnIndex * 2; i < dnIndex * 2 + 2; i++) {
        File blockFile = new File(baseDir, "data" + (i + 1) + "/current/" + blockName);
        if (blockFile.exists()) {
            RandomAccessFile raFile = new RandomAccessFile(blockFile, "rw");
            raFile.setLength(raFile.length() + lenDelta);
            raFile.close();
            return true;
        }
    }
    return false;
}

---

From source file:org.hadoop.tdg.TestPseudoHadoop.java

@BeforeClass
public static void setUpClass() throws IOException {
    RandomAccessFile f = null;
    try {/*from  ww w.j  a  v a 2  s.c  o m*/
        /*f = new File(HOME_FILE);
        FileOutputStream out = new FileOutputStream(f);
        out.write("content".getBytes("UTF-8"));
        out.flush();*/
        f = new RandomAccessFile(HOME_FILE, "rw");
        f.setLength(SIZE);
    } finally {
        IOUtils.closeStream(f);
    }

}

---

From source file:org.apache.jackrabbit.core.data.FileDataStore.java

/**
 * Set the last modified date of a file, if the file is writable.
 *
 * @param file the file/*from   ww w .j  a  v  a2s . c  o  m*/
 * @param time the new last modified date
 * @throws DataStoreException if the file is writable but modifying the date fails
 */
private static void setLastModified(File file, long time) throws DataStoreException {
    if (!file.setLastModified(time)) {
        if (!file.canWrite()) {
            // if we can't write to the file, so garbage collection will also not delete it
            // (read only files or file systems)
            return;
        }
        try {
            // workaround for Windows: if the file is already open for reading
            // (in this or another process), then setting the last modified date
            // doesn't work - see also JCR-2872
            RandomAccessFile r = new RandomAccessFile(file, "rw");
            try {
                r.setLength(r.length());
            } finally {
                r.close();
            }
        } catch (IOException e) {
            throw new DataStoreException("An IO Exception occurred while trying to set the last modified date: "
                    + file.getAbsolutePath(), e);
        }
    }
}

---

From source file:phex.util.FileUtils.java

/**
 * Truncates an input file to the requested size. If the file doesnt exists
 * or is of equal or smaller size noting is done.
 *
 * @param file The file to truncate.// w  ww  .j ava  2 s.  c om
 * @param size The size to truncate to.
 * @throws IOException in case an IO error occures during truncating.
 */
public static void truncateFile(File file, long size) throws IOException {
    if (size < 0) {
        throw new IllegalArgumentException("File size < 0: " + size);
    }
    if (file.exists() && file.length() > size) {
        RandomAccessFile raf = null;
        try {
            raf = new RandomAccessFile(file, "rws");
            raf.setLength(size);
        } finally {
            IOUtil.closeQuietly(raf);
        }
    }
}

---

From source file:org.apache.jackrabbit.oak.run.SegmentUtils.java

static void compact(File directory, boolean force) throws IOException {
    FileStore store = openFileStore(directory.getAbsolutePath(), force);
    try {//from w  w w . j a v a2 s .  c o  m
        boolean persistCM = Boolean.getBoolean("tar.PersistCompactionMap");
        CompactionStrategy compactionStrategy = new CompactionStrategy(false,
                CompactionStrategy.CLONE_BINARIES_DEFAULT, CompactionStrategy.CleanupType.CLEAN_ALL, 0,
                CompactionStrategy.MEMORY_THRESHOLD_DEFAULT) {

            @Override
            public boolean compacted(Callable<Boolean> setHead) throws Exception {
                // oak-run is doing compaction single-threaded
                // hence no guarding needed - go straight ahead
                // and call setHead
                return setHead.call();
            }
        };
        compactionStrategy.setOfflineCompaction(true);
        compactionStrategy.setPersistCompactionMap(persistCM);
        store.setCompactionStrategy(compactionStrategy);
        store.compact();
    } finally {
        store.close();
    }

    System.out.println("    -> cleaning up");
    store = openFileStore(directory.getAbsolutePath(), false);
    try {
        for (File file : store.cleanup()) {
            if (!file.exists() || file.delete()) {
                System.out.println("    -> removed old file " + file.getName());
            } else {
                System.out.println("    -> failed to remove old file " + file.getName());
            }
        }

        String head;
        File journal = new File(directory, "journal.log");
        JournalReader journalReader = new JournalReader(journal);
        try {
            head = journalReader.iterator().next() + " root " + System.currentTimeMillis() + "\n";
        } finally {
            journalReader.close();
        }

        RandomAccessFile journalFile = new RandomAccessFile(journal, "rw");
        try {
            System.out.println("    -> writing new " + journal.getName() + ": " + head);
            journalFile.setLength(0);
            journalFile.writeBytes(head);
            journalFile.getChannel().force(false);
        } finally {
            journalFile.close();
        }
    } finally {
        store.close();
    }
}

---

From source file:org.apache.jackrabbit.oak.run.SegmentTarUtils.java

static void compact(File directory, boolean force) throws IOException {
    FileStore store = newFileStoreBuilder(directory.getAbsolutePath(), force)
            .withGCOptions(defaultGCOptions().setOffline()).build();
    try {/*from w  ww . j av  a  2  s .  co  m*/
        store.compact();
    } finally {
        store.close();
    }

    System.out.println("    -> cleaning up");
    store = newFileStoreBuilder(directory.getAbsolutePath(), force)
            .withGCOptions(defaultGCOptions().setOffline()).build();
    try {
        for (File file : store.cleanup()) {
            if (!file.exists() || file.delete()) {
                System.out.println("    -> removed old file " + file.getName());
            } else {
                System.out.println("    -> failed to remove old file " + file.getName());
            }
        }

        String head;
        File journal = new File(directory, "journal.log");
        JournalReader journalReader = new JournalReader(journal);
        try {
            head = journalReader.next() + " root " + System.currentTimeMillis() + "\n";
        } finally {
            journalReader.close();
        }

        RandomAccessFile journalFile = new RandomAccessFile(journal, "rw");
        try {
            System.out.println("    -> writing new " + journal.getName() + ": " + head);
            journalFile.setLength(0);
            journalFile.writeBytes(head);
            journalFile.getChannel().force(false);
        } finally {
            journalFile.close();
        }
    } finally {
        store.close();
    }
}

---

From source file:com.ettrema.zsync.UploadReader.java

/**
 * Copies the contents of the source file to the destination file and sets the destination
 * file's length.// w w  w  .j  ava 2  s. co  m
 * 
 * @param inFile The source file   
 * @param outFile The destination file
 * @param length The desired length of the destination file
 * @throws IOException
 */
private static void copyFile(File inFile, File outFile, long length) throws IOException {

    InputStream fIn = null;
    OutputStream fOut = null;
    RandomAccessFile randAccess = null;

    try {

        fIn = new FileInputStream(inFile);
        fOut = new FileOutputStream(outFile);
        PartialEntity.sendBytes(fIn, fOut, inFile.length());
    } finally {
        StreamUtils.close(fIn);
        StreamUtils.close(fOut);
    }

    try {

        randAccess = new RandomAccessFile(outFile, "rw");
        randAccess.setLength(length);
    } finally {
        Util.close(randAccess);
    }
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• »