com.google.cloud.dataflow.sdk.io

Class Source.AbstractReader<T>

java.lang.Object

com.google.cloud.dataflow.sdk.io.Source.AbstractReader<T>

Type Parameters:

T -

All Implemented Interfaces:

Source.Reader<T>, AutoCloseable

Direct Known Subclasses:

BoundedSource.AbstractBoundedReader

Enclosing class:

Source<T>

public abstract static class Source.AbstractReader<T>
extends Object
implements Source.Reader<T>

A base class implementing optional methods of Source.Reader in a default way:

• All values have the timestamp of BoundedWindow.TIMESTAMP_MIN_VALUE.

Constructor Summary

Constructors

Constructor and Description
AbstractReader()

Method Summary

Modifier and Type	Method and Description
org.joda.time.Instant	getCurrentTimestamp() Returns the timestamp associated with the current data item.

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, getCurrentSource, start

Constructor Detail

AbstractReader

public AbstractReader()

Method Detail

getCurrentTimestamp

public org.joda.time.Instant getCurrentTimestamp()
                                          throws NoSuchElementException

Description copied from interface: Source.Reader

Returns the timestamp associated with the current data item.

If the source does not support timestamps, this should return BoundedWindow.TIMESTAMP_MIN_VALUE.

Multiple calls to this method without an intervening call to Source.Reader.advance() should return the same result.

Specified by:

getCurrentTimestamp in interface Source.Reader<T>

Throws:

NoSuchElementException - if the reader is at the beginning of the input and Source.Reader.start() or Source.Reader.advance() wasn't called, or if the last Source.Reader.start() or Source.Reader.advance() returned false.