org.apache.giraph.io.formats

Class TextVertexInputFormat.TextVertexReaderFromEachLine

java.lang.Object

org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable<I,V,E>

org.apache.giraph.worker.WorkerAggregatorDelegator<I,V,E>

org.apache.giraph.io.VertexReader<I,V,E>

org.apache.giraph.io.formats.TextVertexInputFormat.TextVertexReader

org.apache.giraph.io.formats.TextVertexInputFormat.TextVertexReaderFromEachLine

All Implemented Interfaces:

AggregatorUsage, GiraphConfigurationSettable<I,V,E>, ImmutableClassesGiraphConfigurable<I,V,E>, WorkerAggregatorUsage, WorkerBroadcastUsage, WorkerGlobalCommUsage, WorkerReduceUsage

Enclosing class:

TextVertexInputFormat<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>

protected abstract class TextVertexInputFormat.TextVertexReaderFromEachLine
extends TextVertexInputFormat.TextVertexReader

Abstract class to be implemented by the user to read a vertex from each text line.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	TextVertexReaderFromEachLine()

Method Summary

Modifier and Type	Method and Description
Vertex<I,V,E>	getCurrentVertex() Get the current vertex.
protected abstract Iterable<Edge<I,E>>	getEdges(org.apache.hadoop.io.Text line) Reads edges value from the current line.
protected abstract I	getId(org.apache.hadoop.io.Text line) Reads vertex id from the current line.
protected abstract V	getValue(org.apache.hadoop.io.Text line) Reads vertex value from the current line.
boolean	nextVertex()

Methods inherited from class org.apache.giraph.io.formats.TextVertexInputFormat.TextVertexReader

close, createLineRecordReader, getContext, getProgress, getRecordReader, initialize

Methods inherited from class org.apache.giraph.worker.WorkerAggregatorDelegator

aggregate, getAggregatedValue, getBroadcast, reduce, reduceMerge, setWorkerGlobalCommUsage

Methods inherited from class org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable

getConf, setConf

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TextVertexReaderFromEachLine

protected TextVertexReaderFromEachLine()

Method Detail

getCurrentVertex

public final Vertex<I,V,E> getCurrentVertex()
                                     throws IOException,
                                            InterruptedException

Description copied from class: VertexReader

Get the current vertex.

Specified by:

getCurrentVertex in class VertexReader<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>

Returns:

the current vertex which has been read. nextVertex() should be called first.

Throws:

IOException

InterruptedException

nextVertex

public final boolean nextVertex()
                         throws IOException,
                                InterruptedException

Specified by:

nextVertex in class VertexReader<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>

Returns:

false iff there are no more vertices

Throws:

IOException

InterruptedException

getId

protected abstract I getId(org.apache.hadoop.io.Text line)
                    throws IOException

Reads vertex id from the current line.

Parameters:

line - the current line

Returns:

the vertex id corresponding to the line

Throws:

IOException - exception that can be thrown while reading

getValue

protected abstract V getValue(org.apache.hadoop.io.Text line)
                       throws IOException

Reads vertex value from the current line.

Parameters:

line - the current line

Returns:

the vertex value corresponding to the line

Throws:

IOException - exception that can be thrown while reading

getEdges

protected abstract Iterable<Edge<I,E>> getEdges(org.apache.hadoop.io.Text line)
                                         throws IOException

Reads edges value from the current line.

Parameters:

line - the current line

Returns:

the edges

Throws:

IOException - exception that can be thrown while reading