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

Introduction

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

Prototype

void readFields(DataInput in) throws IOException;

Source Link

Document

Deserialize the fields of this object from in.

Usage

From source file:com.ebay.erl.mobius.core.datajoin.DataJoinKey.java

License:Apache License

private WritableComparable getKey(byte type, DataInputBuffer input) throws IOException {
    if (type == Tuple.NULL_WRITABLE_TYPE)
        return NullWritable.get();
    else if (type == Tuple.TUPLE_TYPE) {
        Tuple newTuple = new Tuple();
        newTuple.readFields(input);/*w w w  .j av a 2 s.  com*/
        return newTuple;
    } else {
        WritableComparable w = (WritableComparable) ReflectionUtils.newInstance(Util.getClass(input.readUTF()),
                conf);
        w.readFields(input);
        return w;
    }
}

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From source file:com.ebay.erl.mobius.core.model.ReadFieldImpl.java

License:Apache License

@SuppressWarnings("unchecked")
@Override//  w  w  w.  j a  v  a  2 s  . c  o m
protected Void on_writable() throws IOException {
    WritableComparable writable = (WritableComparable) ReflectionUtils.newInstance(Util.getClass(in.readUTF()),
            this.conf);
    writable.readFields(in);
    this.values.add(writable);

    return null;
}

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From source file:org.apache.nutch.searcher.Hits.java

License:Apache License

public void readFields(DataInput in) throws IOException {
    total = in.readLong(); // read total hits
    top = new Hit[in.readInt()]; // read hits returned
    Class sortClass = null;//from w  w w  .j  a v  a  2  s.  co m
    if (top.length > 0) { // read sort value class
        try {
            sortClass = Class.forName(Text.readString(in));
        } catch (ClassNotFoundException e) {
            throw new IOException(e.toString());
        }
    }

    for (int i = 0; i < top.length; i++) {
        int indexDocNo = in.readInt(); // read indexDocNo

        WritableComparable sortValue = null;
        try {
            sortValue = (WritableComparable) sortClass.newInstance();
        } catch (Exception e) {
            throw new IOException(e.toString());
        }
        sortValue.readFields(in); // read sortValue
        String dedupValue = Text.readString(in); // read dedupValue

        top[i] = new Hit(indexDocNo, sortValue, dedupValue);
    }
}

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

License:Apache License

private WritableComparable readWritable(DataInput in) throws IOException {
    String className = (String) readDatum(in);
    // create the writeable class . It needs to have a default constructor
    Class<?> objClass = null;
    try {/*ww w  .ja va2 s.  c o m*/
        objClass = Class.forName(className);
    } catch (ClassNotFoundException e) {
        throw new IOException("Could not find class " + className + ", while attempting to de-serialize it ",
                e);
    }
    WritableComparable writable = null;
    try {
        writable = (WritableComparable) objClass.newInstance();
    } catch (Exception e) {
        String msg = "Could create instance of class " + className
                + ", while attempting to de-serialize it. (no default constructor ?)";
        throw new IOException(msg, e);
    }

    // read the fields of the object from DataInput
    writable.readFields(in);
    return writable;
}

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