org.terrier.structures.collections
Class FSOrderedMapFile.EntryIterator<IK extends org.apache.hadoop.io.Writable,IV extends org.apache.hadoop.io.Writable>

java.lang.Object
  org.terrier.structures.collections.FSOrderedMapFile.EntryIterator<IK,IV>

All Implemented Interfaces:

Closeable, Iterator<Map.Entry<IK,IV>>, Skipable

Enclosing class:

FSOrderedMapFile<K extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable>

public static class FSOrderedMapFile.EntryIterator<IK extends org.apache.hadoop.io.Writable,IV extends org.apache.hadoop.io.Writable>
extends Object
implements Iterator<Map.Entry<IK,IV>>, Closeable, Skipable

an iterator for entries.

Field Summary

protected int	counter
protected DataInput	di
protected FixedSizeWriteableFactory<IK>	keyFactory
protected int	numEntries
protected FixedSizeWriteableFactory<IV>	valueFactory

Constructor Summary

FSOrderedMapFile.EntryIterator(String filename, FixedSizeWriteableFactory<IK> _keyFactory, FixedSizeWriteableFactory<IV> _valueFactory)
constructor

Method Summary

void	close()
boolean	hasNext()
Map.Entry<IK,IV>	next()
void	remove()
void	skip(int _numEntries) Skip forward the specified number of entries.

Methods inherited from class java.lang.Object

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

Field Detail

di

protected DataInput di

numEntries

protected int numEntries

counter

protected int counter

keyFactory

protected FixedSizeWriteableFactory<IK extends org.apache.hadoop.io.Writable> keyFactory

valueFactory

protected FixedSizeWriteableFactory<IV extends org.apache.hadoop.io.Writable> valueFactory

Constructor Detail

FSOrderedMapFile.EntryIterator

public FSOrderedMapFile.EntryIterator(String filename,
                                      FixedSizeWriteableFactory<IK> _keyFactory,
                                      FixedSizeWriteableFactory<IV> _valueFactory)
                               throws IOException

constructor

Parameters:

filename -

_keyFactory -

_valueFactory -

Throws:

IOException

Method Detail

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Throws:

IOException

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<Map.Entry<IK extends org.apache.hadoop.io.Writable,IV extends org.apache.hadoop.io.Writable>>

next

public Map.Entry<IK,IV> next()

Specified by:

next in interface Iterator<Map.Entry<IK extends org.apache.hadoop.io.Writable,IV extends org.apache.hadoop.io.Writable>>

remove

public void remove()

Specified by:

remove in interface Iterator<Map.Entry<IK extends org.apache.hadoop.io.Writable,IV extends org.apache.hadoop.io.Writable>>

skip

public void skip(int _numEntries)
          throws IOException

Skip forward the specified number of entries. Should be followed by a next() call.

Specified by:

skip in interface Skipable

Parameters:

_numEntries - number of entries to skip

Throws:

IOException - if an IO problem occurs.