io.joshworks.snappy.loader.data

Class RandomAccessDataFile

java.lang.Object

io.joshworks.snappy.loader.data.RandomAccessDataFile

All Implemented Interfaces:

RandomAccessData

public class RandomAccessDataFile
extends Object
implements RandomAccessData

RandomAccessData implementation backed by a RandomAccessFile.

Author:

Phillip Webb

Nested Class Summary

Nested classes/interfaces inherited from interface io.joshworks.snappy.loader.data.RandomAccessData

RandomAccessData.ResourceAccess

Constructor Summary

Constructors

Constructor and Description
RandomAccessDataFile(File file) Create a new RandomAccessDataFile backed by the specified file.
RandomAccessDataFile(File file, int concurrentReads) Create a new RandomAccessDataFile backed by the specified file.

Method Summary

Modifier and Type	Method and Description
void	close()
File	getFile() Returns the underlying File.
InputStream	getInputStream(RandomAccessData.ResourceAccess access) Returns an InputStream that can be used to read the underlying data.
long	getSize() Returns the size of the data.
RandomAccessData	getSubsection(long offset, long length) Returns a new RandomAccessData for a specific subsection of this data.

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomAccessDataFile

public RandomAccessDataFile(File file)

Create a new RandomAccessDataFile backed by the specified file.

Parameters:

file - the underlying file

Throws:

IllegalArgumentException - if the file is null or does not exist

See Also:

RandomAccessDataFile(File, int)

RandomAccessDataFile

public RandomAccessDataFile(File file,
                            int concurrentReads)

Create a new RandomAccessDataFile backed by the specified file.

Parameters:

file - the underlying file

concurrentReads - the maximum number of concurrent reads allowed on the underlying file before blocking

Throws:

IllegalArgumentException - if the file is null or does not exist

See Also:

RandomAccessDataFile(File)

Method Detail

getFile

public File getFile()

Returns the underlying File.

Returns:

the underlying file

getInputStream

public InputStream getInputStream(RandomAccessData.ResourceAccess access)
                           throws IOException

Description copied from interface: RandomAccessData

Returns an InputStream that can be used to read the underlying data. The caller is responsible close the underlying stream.

Specified by:

getInputStream in interface RandomAccessData

Parameters:

access - hint indicating how the underlying data should be accessed

Returns:

a new input stream that can be used to read the underlying data.

Throws:

IOException - if the stream cannot be opened

getSubsection

public RandomAccessData getSubsection(long offset,
                                      long length)

Description copied from interface: RandomAccessData

Returns a new RandomAccessData for a specific subsection of this data.

Specified by:

getSubsection in interface RandomAccessData

Parameters:

offset - the offset of the subsection

length - the length of the subsection

Returns:

the subsection data

getSize

public long getSize()

Description copied from interface: RandomAccessData

Returns the size of the data.

Specified by:

getSize in interface RandomAccessData

Returns:

the size

close

public void close()
           throws IOException

Throws:

IOException