Example usage for org.apache.hadoop.io Writable readFields

Introduction

In this page you can find the example usage for org.apache.hadoop.io Writable readFields.

Prototype

void readFields(DataInput in) throws IOException;

Source Link

Document

Deserialize the fields of this object from in.

Usage

From source file:org.goldenorb.zookeeper.ZookeeperUtils.java

License:Apache License

/**
 * // w w  w .jav a2  s .  c  o  m
 * @param byteArray
 *          - byte[]
 * @param w
 *          - Writable
 * @returns Writable
 */
public static Writable byteArrayToWritable(byte[] byteArray, Writable w) throws IOException {
    ByteArrayInputStream bais = new ByteArrayInputStream(byteArray);
    DataInput in = new DataInputStream(bais);
    w.readFields(in);
    return w;
}

From source file:org.gridgain.grid.kernal.processors.hadoop.v2.GridHadoopWritableSerialization.java

License:Open Source License

/** {@inheritDoc} */
@Override//from   w  w w.  ja v a 2  s.  c o  m
public Object read(DataInput in, @Nullable Object obj) throws GridException {
    Writable w = obj == null ? U.newInstance(cls) : cls.cast(obj);

    try {
        w.readFields(in);
    } catch (IOException e) {
        throw new GridException(e);
    }

    return w;
}

From source file:org.megalon.MArrayWritable.java

License:Apache License

public void readFields(DataInput in) throws IOException {
    // values = new Writable[in.readInt()]; // construct values
    values = (Writable[]) Array.newInstance(valueClass, in.readInt());
    for (int i = 0; i < values.length; i++) {
        Writable value = WritableFactories.newInstance(valueClass);
        value.readFields(in); // read a value
        values[i] = value; // store it in values
    }// w  w w  .  jav a 2s . c o m
}

From source file:org.opencloudengine.flamingo.mapreduce.util.WritableUtils.java

License:Apache License

/**
 * Read fields from byteArray to a Writeable object.
 *
 * @param byteArray      Byte array to find the fields in.
 * @param writableObject Object to fill in the fields.
 */// w  w  w  .j  a  v  a2  s.co m
public static void readFieldsFromByteArray(byte[] byteArray, Writable writableObject) {
    DataInputStream inputStream = new DataInputStream(new ByteArrayInputStream(byteArray));
    try {
        writableObject.readFields(inputStream);
    } catch (IOException e) {
        throw new IllegalStateException("readFieldsFromByteArray: IOException", e);
    }
}

From source file:org.opencloudengine.flamingo.mapreduce.util.WritableUtils.java

License:Apache License

/**
 * Read fields from byteArray to a list of Writeable objects.
 *
 * @param byteArray     Byte array to find the fields in.
 * @param writableClass Class of the objects to instantiate.
 * @param conf          Configuration used for instantiation (i.e Configurable)
 * @return List of writable objects.//from w w w.  j a  v  a 2s  . co  m
 */
public static List<? extends Writable> readListFieldsFromByteArray(byte[] byteArray,
        Class<? extends Writable> writableClass, Configuration conf) {
    try {
        DataInputStream inputStream = new DataInputStream(new ByteArrayInputStream(byteArray));
        int size = inputStream.readInt();
        List<Writable> writableList = new ArrayList<Writable>(size);
        for (int i = 0; i < size; ++i) {
            Writable writable = ReflectionUtils.newInstance(writableClass, conf);
            writable.readFields(inputStream);
            writableList.add(writable);
        }
        return writableList;
    } catch (IOException e) {
        throw new IllegalStateException("readListFieldsFromZnode: IOException", e);
    }
}

From source file:org.qcri.algebra.DummyRecordWriter.java

License:Apache License

private void cloneWritable(Writable from, Writable to) throws IOException {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    DataOutputStream dos = new DataOutputStream(baos);
    from.write(dos);/*from   w ww.  j a v a  2 s.c  o m*/
    dos.close();
    ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
    DataInputStream dis = new DataInputStream(bais);
    to.readFields(dis);
}

From source file:org.qcri.pca.MahoutCompatibilityTest.java

License:Apache License

private static void writeAndRead(Writable toWrite, Writable toRead) throws IOException {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    DataOutputStream dos = new DataOutputStream(baos);
    try {//from ww  w .  j  a  va2  s  .  c  o m
        toWrite.write(dos);
    } finally {
        Closeables.close(dos, true);
    }

    ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
    DataInputStream dis = new DataInputStream(bais);
    try {
        toRead.readFields(dis);
    } finally {
        Closeables.close(dos, true);
    }
}

From source file:org.sf.xrime.model.edge.EdgeSet.java

License:Apache License

@SuppressWarnings("unchecked")
@Override//  ww  w .ja v a 2s. c o m
public void readFields(DataInput in) throws IOException {
    // Clear the container.
    _edges.clear();
    // Determine the size.
    int size = in.readInt();
    if (size > 0) {
        // All edges in the set should have the same type.
        String className = Text.readString(in);
        try {
            Class instanceClass;
            instanceClass = Class.forName(className);
            for (int i = 0; i < size; i++) {
                Writable writable = WritableFactories.newInstance(instanceClass, null);
                writable.readFields(in);
                if (writable instanceof Edge) {
                    addEdge((Edge) writable);
                }
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

From source file:org.sf.xrime.model.label.Labels.java

License:Apache License

@Override
@SuppressWarnings("unchecked")
public void readFields(DataInput in) throws IOException {
    // Clear the container.
    labels.clear();/* w  ww  .  j a v a  2  s.  c o m*/
    // Determine the size of container.
    int size = in.readInt();
    while (size-- > 0) {
        // Each key is a string, but the label value may be of different types.
        String key = Text.readString(in);
        String valueClassName = Text.readString(in);

        try {
            Class instanceClass;
            instanceClass = Class.forName(valueClassName);
            Writable writable = WritableFactories.newInstance(instanceClass, null);
            writable.readFields(in);
            labels.put(key, writable);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
            throw new IOException(e.getMessage());
        }
    }
}

From source file:org.sf.xrime.model.path.PathAsVertexesList.java

License:Apache License

@SuppressWarnings("unchecked")
@Override/*  ww w. j a  va  2  s .  c  o  m*/
public void readFields(DataInput in) throws IOException {
    // Clear the container.
    _vertexes.clear();
    // Determine the size.
    int size = in.readInt();
    if (size > 0) {
        // All vertexes in the set should have the same type.
        String className = Text.readString(in);
        try {
            Class instanceClass;
            instanceClass = Class.forName(className);
            for (int i = 0; i < size; i++) {
                Writable writable = WritableFactories.newInstance(instanceClass, null);
                writable.readFields(in);
                if (writable instanceof Vertex) {
                    addVertex((Vertex) writable);
                }
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}