org.terrier.structures.postings
Class FieldIterablePosting

java.lang.Object
  org.terrier.structures.postings.BasicPostingImpl
      org.terrier.structures.postings.BasicIterablePosting
          org.terrier.structures.postings.FieldIterablePosting

All Implemented Interfaces:

java.io.Closeable, org.apache.hadoop.io.Writable, FieldPosting, IterablePosting, Posting, WritablePosting

public class FieldIterablePosting
extends BasicIterablePosting
implements FieldPosting

A posting iterator for field postings.

Since:

3.0

Author:

Craig Macdonald

See Also:

Posting, IterablePosting, FieldPosting

Field Summary

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

bitFileReader, doi, numEntries

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

id, tf

Fields inherited from interface org.terrier.structures.postings.IterablePosting

EOL

Constructor Summary

FieldIterablePosting(BitIn fileReader, int entries, DocumentIndex _doi, int _fieldCount)
constructor

FieldIterablePosting(int _fieldCount)
contructor

Method Summary

WritablePosting	asWritablePosting() Get this posting as a WritablePosting
int[]	getFieldFrequencies() Returns the frequencies of the term in each field of the document
int[]	getFieldLengths() Returns the lengths of the each fields in the current document
int	next() Move this iterator to the next posting.
void	readFields(java.io.DataInput in) Read this posting from specified inputstream
java.lang.String	toString() Makes a human readable form of this posting
void	write(java.io.DataOutput out) Write this posting to specified outputstream

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

close, endOfPostings, getDocumentLength, next

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

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

FieldIterablePosting

public FieldIterablePosting(int _fieldCount)

contructor

Parameters:

_fieldCount -

FieldIterablePosting

public FieldIterablePosting(BitIn fileReader,
                            int entries,
                            DocumentIndex _doi,
                            int _fieldCount)
                     throws java.io.IOException

constructor

Parameters:

fileReader -

entries -

_doi -

_fieldCount -

Throws:

java.io.IOException

Method Detail

getFieldFrequencies

public int[] getFieldFrequencies()

Returns the frequencies of the term in each field of the document

Specified by:

getFieldFrequencies in interface FieldPosting

next

public int next()
         throws java.io.IOException

Move this iterator to the next posting.

Specified by:

next in interface IterablePosting

Overrides:

next in class BasicIterablePosting

Returns:

id of next posting, or EOL if end of posting list

Throws:

java.io.IOException

getFieldLengths

public int[] getFieldLengths()

Returns the lengths of the each fields in the current document

Specified by:

getFieldLengths in interface FieldPosting

readFields

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

Read this posting from specified inputstream

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

Write this posting to specified outputstream

Specified by:

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

Overrides:

write in class BasicPostingImpl

Throws:

java.io.IOException

asWritablePosting

public WritablePosting asWritablePosting()

Get this posting as a WritablePosting

Specified by:

asWritablePosting in interface Posting

Overrides:

asWritablePosting in class BasicIterablePosting

Returns:

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

toString

public java.lang.String toString()

Description copied from class: BasicPostingImpl

Makes a human readable form of this posting

Overrides:

toString in class BasicPostingImpl