org.knime.core.data.container
Class JoinTableIterator

java.lang.Object
  org.knime.core.data.RowIterator
      org.knime.core.data.container.CloseableRowIterator
          org.knime.core.data.container.JoinTableIterator

All Implemented Interfaces:

Iterator<DataRow>

 class JoinTableIterator
extends CloseableRowIterator

Internal iterator class that concatenates two rows. The iterator assumes that both underlying iterators return the row keys in the same order. No check is done.

Author:

wiswedel, University of Konstanz

Constructor Summary

JoinTableIterator(CloseableRowIterator itReference, CloseableRowIterator itAppended, int[] map, boolean[] flags)
Creates new iterator based on two iterators.

Method Summary

void	close() Closes this iterator.
boolean	hasNext() Returns true if there are more rows and false otherwise.
DataRow	next() Returns the next DataRow.

Methods inherited from class org.knime.core.data.RowIterator

remove

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinTableIterator

JoinTableIterator(CloseableRowIterator itReference,
                  CloseableRowIterator itAppended,
                  int[] map,
                  boolean[] flags)

Creates new iterator based on two iterators.

Parameters:

itReference - The reference iterator, providing the keys, e.g.

itAppended - The row to be appended.

map - The internal map which columns are contributed from what iterator

flags - The flags from which row to use.

Method Detail

hasNext

public boolean hasNext()

Returns true if there are more rows and false otherwise.

Specified by:

hasNext in interface Iterator<DataRow>

Specified by:

hasNext in class RowIterator

Returns:

true if the iterator has more elements, otherwise false

See Also:

RowIterator.next()

next

public DataRow next()

Returns the next DataRow.

Specified by:

next in interface Iterator<DataRow>

Specified by:

next in class RowIterator

Returns:

the next row in the DataTable

close

public void close()

Closes this iterator. Subsequent calls of RowIterator.hasNext() will return false. This method does not need to be called if the iterator was pushed to the end (stream will be closed automatically). It's meant to be used in cases where the iterator might not advance to the end of the table.

This method does nothing if the table is already closed (multiple invocations are ignored).

Specified by:

close in class CloseableRowIterator