Package org.terrier.structures.postings

Class BlockPostingImpl

java.lang.Object

org.terrier.structures.postings.BasicPostingImpl

org.terrier.structures.postings.BlockPostingImpl

All Implemented Interfaces:

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

Direct Known Subclasses:

BlockFieldPostingImpl

public class BlockPostingImpl
extends BasicPostingImpl
implements BlockPosting

BlockPostingImpl class

See Also:

Serialized Form

Field Summary

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

dl, id, tf

Constructor Summary

Constructors

Constructor	Description
BlockPostingImpl()	empty constructor for Writable implementation
BlockPostingImpl(int docid, int frequency, int[] _positions)	constructor

Method Summary

Modifier and Type	Method	Description
WritablePosting	asWritablePosting()	Copy this posting to one free of an iterator.
int[]	getPositions()	Return the positions of occurrences of the term in the current document.
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, setDocumentLength, setId, setTf

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

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 the positions of occurrences of the term in the current document.

Specified by:

getPositions in interface BlockPosting

Returns:

the positions of occurrences of the term in the current document.

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()

Copy 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 manipulated free of this iterator

toString

public java.lang.String toString()

Makes a human readable form of this posting

Overrides:

toString in class BasicPostingImpl