Package org.apache.flink.runtime.operators.util

Class ReaderIterator<T>

java.lang.Object

org.apache.flink.runtime.operators.util.ReaderIterator<T>

All Implemented Interfaces:

MutableObjectIterator<T>

public class ReaderIterator<T>
extends Object
implements MutableObjectIterator<T>

A MutableObjectIterator that wraps a reader from an input channel and produces the reader's records.

The reader supports reading objects with possible reuse of mutable types, and without reuse of mutable types.

Constructor Summary

Constructors

Constructor	Description
ReaderIterator(MutableReader<DeserializationDelegate<T>> reader, TypeSerializer<T> serializer)	Creates a new iterator, wrapping the given reader.

Method Summary

Modifier and Type	Method	Description
T	next()	Gets the next element from the collection.
T	next(T target)	Gets the next element from the collection.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReaderIterator

public ReaderIterator(MutableReader<DeserializationDelegate<T>> reader,
                      TypeSerializer<T> serializer)

Creates a new iterator, wrapping the given reader.

Parameters:

reader - The reader to wrap.

Method Detail

next

public T next(T target)
       throws IOException

Description copied from interface: MutableObjectIterator

Gets the next element from the collection. The contents of that next element is put into the given reuse object, if the type is mutable.

Specified by:

next in interface MutableObjectIterator<T>

Parameters:

target - The target object into which to place next element if E is mutable.

Returns:

The filled object or null if the iterator is exhausted.

Throws:

IOException - Thrown, if a problem occurred in the underlying I/O layer or in the serialization / deserialization logic

next

public T next()
       throws IOException

Description copied from interface: MutableObjectIterator

Gets the next element from the collection. The iterator implementation must obtain a new instance.

Specified by:

next in interface MutableObjectIterator<T>

Returns:

The object or null if the iterator is exhausted.

Throws:

IOException - Thrown, if a problem occurred in the underlying I/O layer or in the serialization / deserialization logic