com.google.cloud.dataflow.sdk.io

Class ByteOffsetBasedSource.ByteOffsetBasedReader<T>

java.lang.Object

com.google.cloud.dataflow.sdk.io.ByteOffsetBasedSource.ByteOffsetBasedReader<T>

All Implemented Interfaces:

Source.Reader<T>, java.lang.AutoCloseable

Direct Known Subclasses:

FileBasedSource.FileBasedReader

Enclosing class:

ByteOffsetBasedSource<T>

public abstract static class ByteOffsetBasedSource.ByteOffsetBasedReader<T>
extends java.lang.Object
implements Source.Reader<T>

A reader that implements code common to readers of all ByteOffsetBasedSources.

Constructor Summary

Constructors

Constructor and Description
ByteOffsetBasedSource.ByteOffsetBasedReader(ByteOffsetBasedSource<T> source)

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract long	getCurrentOffset() Returns the current offset of the reader.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.cloud.dataflow.sdk.io.Source.Reader

advance, close, getCurrent, start

Constructor Detail

ByteOffsetBasedSource.ByteOffsetBasedReader

public ByteOffsetBasedSource.ByteOffsetBasedReader(ByteOffsetBasedSource<T> source)

Parameters:

source - the ByteOffsetBasedSource to be read by the current reader.

Method Detail

getCurrentOffset

protected abstract long getCurrentOffset()

Returns the current offset of the reader. The value returned by this method is undefined until the method Source.Reader.start() is called. After Source.Reader.start() is called the value returned by this method should represent the offset of the value that will be returned by the Source.Reader.getCurrent() call. Values returned for two consecutive records should be non-strictly increasing. If the reader has reached the end of the stream this should return Long.MAX_VALUE. The value returned may be outside the range defined by the ByteOffsetBasedSource corresponding to this reader, for reasons described in the comment to ByteOffsetBasedSource.