com.fasterxml.sort
Class DataReader<T>

java.lang.Object
  com.fasterxml.sort.DataReader<T>

Direct Known Subclasses:

CollectionReader, Merger, RawTextLineReader

public abstract class DataReader<T>
extends Object

Constructor Summary

DataReader()

Method Summary

abstract void	close() Method for closing the reader.
abstract int	estimateSizeInBytes(T item) Method that should estimate memory usage of given item, for purpose of limiting amount of data kept in memory during pre-sorting phase.
abstract T	readNext() Method for reading the next data item; will return null to indicate end of input, otherwise return a non-null item.

Methods inherited from class java.lang.Object

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

Constructor Detail

DataReader

public DataReader()

Method Detail

readNext

public abstract T readNext()
                    throws IOException

Method for reading the next data item; will return null to indicate end of input, otherwise return a non-null item.

Throws:

IOException

estimateSizeInBytes

public abstract int estimateSizeInBytes(T item)

Method that should estimate memory usage of given item, for purpose of limiting amount of data kept in memory during pre-sorting phase.

close

public abstract void close()
                    throws IOException

Method for closing the reader. Note that reader needs to ensure that it is ok to call close multiple times. Reader may also close underlying resources as soon as it has reached end of input.

Throws:

IOException