Example usage for org.apache.hadoop.io NullWritable get

Introduction

In this page you can find the example usage for org.apache.hadoop.io NullWritable get.

Prototype

public static NullWritable get()

Source Link

Document

Returns the single instance of this class.

Usage

From source file:org.apache.giraph.block_app.library.pagerank.PageRankTest.java

License:Apache License

/**
 * Creates a map of unweighted edges from neighbors
 *
 * @param neighbors  neighbors/*  w w  w  .j  a  va 2  s  . c  o  m*/
 * @return  returns the edges
 */
private static Map.Entry<LongWritable, NullWritable>[] createEdgesWeightless(int[] neighbors) {
    Map.Entry<LongWritable, NullWritable>[] edges = new Map.Entry[neighbors.length];
    for (int i = 0; i < neighbors.length; i++) {
        edges[i] = new AbstractMap.SimpleEntry<>(new LongWritable(neighbors[i]), NullWritable.get());
    }
    return edges;
}

From source file:org.apache.giraph.block_app.test_setup.TestGraphUtils.java

License:Apache License

public static Supplier<NullWritable> nullSupplier() {
    return new Supplier<NullWritable>() {
        @Override//  ww w  .  ja va2  s .  c o m
        public NullWritable get() {
            return NullWritable.get();
        }
    };
}

From source file:org.apache.giraph.combiner.NullMessageCombiner.java

License:Apache License

@Override
public NullWritable createInitialMessage() {
    return NullWritable.get();
}

From source file:org.apache.giraph.debugger.mock.TestGraphGenerator.java

License:Apache License

/**
 * Constructs a {@link Writable} object with the appropriate type that
 * contains the specified content. For example, type can be LongWritable,
 * and content can be 100L, and this method would return a new
 * {@link LongWritable} that has value 100.
 * @param contents contetns of the writable.
 * @param type type of the writable./*from  w  w  w  .  j av a  2 s  . c om*/
 * @return a {@link Writable} object of appropriate type, whose value contains
 * the given contents.
 */
private Writable convertToSuitableType(String contents, WritableType type) {
    switch (type) {
    case NULL:
        return NullWritable.get();
    case LONG:
        return new LongWritable(Long.valueOf(contents));
    case DOUBLE:
        return new DoubleWritable(Double.valueOf(contents));
    default:
        throw new IllegalStateException("Unknown type!");
    }
}

From source file:org.apache.giraph.edge.EdgeNoValue.java

License:Apache License

@Override
public NullWritable getValue() {
    return NullWritable.get();
}

From source file:org.apache.giraph.edge.IntNullArrayEdges.java

License:Apache License

@Override
public Iterator<Edge<IntWritable, NullWritable>> iterator() {
    // Returns an iterator that reuses objects.
    return new UnmodifiableIterator<Edge<IntWritable, NullWritable>>() {
        /** Wrapped neighbors iterator. */
        private final IntIterator neighborsIt = neighbors.iterator();
        /** Representative edge object. */
        private final Edge<IntWritable, NullWritable> representativeEdge = EdgeFactory.create(new IntWritable(),
                NullWritable.get());

        @Override/*  w w w  .  j a va2s  .co m*/
        public boolean hasNext() {
            return neighborsIt.hasNext();
        }

        @Override
        public Edge<IntWritable, NullWritable> next() {
            representativeEdge.getTargetVertexId().set(neighborsIt.nextInt());
            return representativeEdge;
        }
    };
}

From source file:org.apache.giraph.edge.LongNullHashSetEdges.java

License:Apache License

@Override
public NullWritable getEdgeValue(LongWritable targetVertexId) {
    if (neighbors.contains(targetVertexId.get())) {
        return NullWritable.get();
    } else {//from w  w  w .j  a va 2  s .com
        return null;
    }
}

From source file:org.apache.giraph.examples.scc.SccComputationTestInMemory.java

License:Apache License

@SuppressWarnings("unchecked")
public static Entry<LongWritable, NullWritable>[] makeEdges(long... args) {
    Entry<LongWritable, NullWritable> result[] = new Entry[args.length];
    for (int i = 0; i < args.length; i++) {
        result[i] = new SimpleEntry<LongWritable, NullWritable>(new LongWritable(args[i]), NullWritable.get());
    }/* w  w  w  . j av a2 s.  c o m*/
    return result;
}

From source file:org.apache.giraph.graph.DefaultVertexValueFactory.java

License:Apache License

@Override
public V createVertexValue() {
    if (vertexValueClass == NullWritable.class) {
        return (V) NullWritable.get();
    } else {/*from www .j av  a 2  s  .  c o m*/
        try {
            return vertexValueClass.newInstance();
        } catch (InstantiationException e) {
            throw new IllegalArgumentException("createVertexValue: Failed to instantiate", e);
        } catch (IllegalAccessException e) {
            throw new IllegalArgumentException("createVertexValue: Illegally accessed", e);
        }
    }
}

From source file:org.apache.giraph.graph.IntIntNullIntVertex.java

License:Apache License

@Override
public NullWritable getEdgeValue(IntWritable targetVertexId) {
    return NullWritable.get();
}