org.terrier.structures.postings
Class BlockPostingImpl

java.lang.Object
  org.terrier.structures.postings.BasicPostingImpl
      org.terrier.structures.postings.BlockPostingImpl

All Implemented Interfaces:

org.apache.hadoop.io.Writable, BlockPosting, Posting, WritablePosting

Direct Known Subclasses:

BlockFieldPostingImpl

public class BlockPostingImpl
extends BasicPostingImpl
implements BlockPosting

BlockPostingImpl class

Field Summary

Fields inherited from class org.terrier.structures.postings.BasicPostingImpl

id, tf

Constructor Summary

BlockPostingImpl()
empty constructor for Writable implementation

BlockPostingImpl(int docid, int frequency, int[] _positions)
constructor

Method Summary

WritablePosting	asWritablePosting() Copies this posting to one free of an iterator.
int[]	getPositions() Return positions of occurrences
void	readFields(java.io.DataInput in) Reads the a single posting (not an iterable posting - use BitPostingIndex for that)
java.lang.String	toString() Makes a human readable form of this posting
void	write(java.io.DataOutput out) Writes the current posting (not an iterable posting - use DirectInvertedOutputStream for that).

Methods inherited from class org.terrier.structures.postings.BasicPostingImpl

getDocumentLength, getFrequency, getId, setId

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.terrier.structures.postings.Posting

getDocumentLength, getFrequency, getId, setId

Constructor Detail

BlockPostingImpl

public BlockPostingImpl()

empty constructor for Writable implementation

BlockPostingImpl

public BlockPostingImpl(int docid,
                        int frequency,
                        int[] _positions)

constructor

Parameters:

docid -

frequency -

_positions -

Method Detail

getPositions

public int[] getPositions()

Return positions of occurrences

Specified by:

getPositions in interface BlockPosting

readFields

public void readFields(java.io.DataInput in)
                throws java.io.IOException

Reads the a single posting (not an iterable posting - use BitPostingIndex for that)

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Overrides:

readFields in class BasicPostingImpl

Throws:

java.io.IOException

write

public void write(java.io.DataOutput out)
           throws java.io.IOException

Writes the current posting (not an iterable posting - use DirectInvertedOutputStream for that). Compression using this method is not expected to be comparable to bit-level compression.

Specified by:

write in interface org.apache.hadoop.io.Writable

Overrides:

write in class BasicPostingImpl

Throws:

java.io.IOException

asWritablePosting

public WritablePosting asWritablePosting()

Copies this posting to one free of an iterator. Kind of like a clone.

Specified by:

asWritablePosting in interface Posting

Overrides:

asWritablePosting in class BasicPostingImpl

Returns:

an identical posting, but which can be maniulated free of this iterator

toString

public java.lang.String toString()

Makes a human readable form of this posting

Overrides:

toString in class BasicPostingImpl