org.apache.flink.runtime.util

类 ReusingKeyGroupedIterator<E>

java.lang.Object

org.apache.flink.runtime.util.ReusingKeyGroupedIterator<E>

所有已实现的接口:

KeyGroupedIterator<E>

public final class ReusingKeyGroupedIterator<E>
extends Object
implements KeyGroupedIterator<E>

The KeyValueIterator returns a key and all values that belong to the key (share the same key).

嵌套类概要

嵌套类

限定符和类型	类和说明
class	ReusingKeyGroupedIterator.ValuesIterator

构造器概要

构造器

构造器和说明
ReusingKeyGroupedIterator(org.apache.flink.util.MutableObjectIterator<E> iterator, org.apache.flink.api.common.typeutils.TypeSerializer<E> serializer, org.apache.flink.api.common.typeutils.TypeComparator<E> comparator) Initializes the KeyGroupedIterator.

方法概要

限定符和类型	方法和说明
org.apache.flink.api.common.typeutils.TypeComparator<E>	getComparatorWithCurrentReference()
E	getCurrent()
ReusingKeyGroupedIterator.ValuesIterator	getValues() Returns an iterator over all values that belong to the current key.
boolean	nextKey() Moves the iterator to the next key.

从类继承的方法 java.lang.Object

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

构造器详细资料

ReusingKeyGroupedIterator

public ReusingKeyGroupedIterator(org.apache.flink.util.MutableObjectIterator<E> iterator,
                                 org.apache.flink.api.common.typeutils.TypeSerializer<E> serializer,
                                 org.apache.flink.api.common.typeutils.TypeComparator<E> comparator)

Initializes the KeyGroupedIterator. It requires an iterator which returns its result sorted by the key fields.

参数:

iterator - An iterator over records, which are sorted by the key fields, in any order.

serializer - The serializer for the data type iterated over.

comparator - The comparator for the data type iterated over.

方法详细资料

nextKey

public boolean nextKey()
                throws IOException

Moves the iterator to the next key. This method may skip any values that have not yet been returned by the iterator created by the getValues() method. Hence, if called multiple times it "removes" pairs.

指定者:

nextKey 在接口中 KeyGroupedIterator<E>

返回:

true if the input iterator has an other group of key-value pairs that share the same key.

抛出:

IOException

getComparatorWithCurrentReference

public org.apache.flink.api.common.typeutils.TypeComparator<E> getComparatorWithCurrentReference()

getCurrent

public E getCurrent()

指定者:

getCurrent 在接口中 KeyGroupedIterator<E>

getValues

public ReusingKeyGroupedIterator.ValuesIterator getValues()

Returns an iterator over all values that belong to the current key. The iterator is initially null (before the first call to nextKey() and after all keys are consumed. In general, this method returns always a non-null value, if a previous call to nextKey() return true.

指定者:

getValues 在接口中 KeyGroupedIterator<E>

返回:

Iterator over all values that belong to the current key.