com.asakusafw.windgate.hadoopfs.temporary

Interface ModelInputProvider<T>

Type Parameters:

T - target model type

All Superinterfaces:

AutoCloseable, Closeable

All Known Implementing Classes:

FileListModelInputProvider, FileSystemModelInputProvider

public interface ModelInputProvider<T>
extends Closeable

Provides model input list.

Since:

0.2.5

Method Summary

Modifier and Type	Method and Description
boolean	next() Returns true iff the next temporary file exists, and then the open() method returns it.
ModelInput<T>	open() Opens the current temporary file prepared by the next() method.

Methods inherited from interface java.io.Closeable

close

Method Detail

next

boolean next()
      throws IOException

Returns true iff the next temporary file exists, and then the open() method returns it.

Returns:

true if the next data model object exists, otherwise false

Throws:

IOException - if failed to prepare the next data

open

ModelInput<T> open()
            throws IOException

Opens the current temporary file prepared by the next() method. This operation can perform only once for each temporary file.

Returns:

the current temporary file contents

Throws:

IOException - if failed to open the file