org.apache.avro.file
Class DataFileStream<D>

java.lang.Object
  org.apache.avro.file.DataFileStream<D>

All Implemented Interfaces:

Iterable<D>, Iterator<D>

Direct Known Subclasses:

DataFileReader

public class DataFileStream<D>
extends Object
implements Iterator<D>, Iterable<D>

Streaming access to files written by DataFileWriter. Use DataFileReader for file-based input.

See Also:

DataFileWriter

Constructor Summary

protected	DataFileStream(DatumReader<D> reader) create an unitialized DataFileStream
	DataFileStream(InputStream in, DatumReader<D> reader) Construct a reader for an input stream.

Method Summary

protected void	blockFinished()
void	close() Close this reader.
byte[]	getMeta(String key) Return the value of a metadata property.
long	getMetaLong(String key) Return the value of a metadata property.
String	getMetaString(String key) Return the value of a metadata property.
Schema	getSchema() Return the schema used in this file.
boolean	hasNext() True if more entries remain in this file.
Iterator<D>	iterator() Returns an iterator over entries in this file.
D	next() Read the next datum in the file.
D	next(D reuse) Read the next datum from the file.
void	remove() Not supported.

Methods inherited from class java.lang.Object

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

Constructor Detail

DataFileStream

public DataFileStream(InputStream in,
                      DatumReader<D> reader)
               throws IOException

Construct a reader for an input stream. For file-based input, use DataFileReader. This will buffer, wrapping with a BufferedInputStream is not necessary.

Throws:

IOException

DataFileStream

protected DataFileStream(DatumReader<D> reader)
                  throws IOException

create an unitialized DataFileStream

Throws:

IOException

Method Detail

getSchema

public Schema getSchema()

Return the schema used in this file.

getMeta

public byte[] getMeta(String key)

Return the value of a metadata property.

getMetaString

public String getMetaString(String key)

Return the value of a metadata property.

getMetaLong

public long getMetaLong(String key)

Return the value of a metadata property.

iterator

public Iterator<D> iterator()

Returns an iterator over entries in this file. Note that this iterator is shared with other users of the file: it does not contain a separate pointer into the file.

Specified by:

iterator in interface Iterable<D>

hasNext

public boolean hasNext()

True if more entries remain in this file.

Specified by:

hasNext in interface Iterator<D>

next

public D next()

Read the next datum in the file.

Specified by:

next in interface Iterator<D>

Throws:

NoSuchElementException - if no more remain in the file.

next

public D next(D reuse)
       throws IOException

Read the next datum from the file.

Parameters:

reuse - an instance to reuse.

Throws:

NoSuchElementException - if no more remain in the file.

IOException

blockFinished

protected void blockFinished()
                      throws IOException

Throws:

IOException

remove

public void remove()

Not supported.

Specified by:

remove in interface Iterator<D>

close

public void close()
           throws IOException

Close this reader.

Throws:

IOException