com.sun.labs.minion.classification
Class FeatureEntry

java.lang.Object
  com.sun.labs.minion.indexer.entry.BaseEntry
      com.sun.labs.minion.indexer.entry.SinglePostingsEntry
          com.sun.labs.minion.classification.FeatureEntry

All Implemented Interfaces:

Entry, IndexEntry, QueryEntry, java.lang.Comparable

public class FeatureEntry
extends SinglePostingsEntry

Field Summary

Fields inherited from class com.sun.labs.minion.indexer.entry.SinglePostingsEntry

log, logTag, n, offset, p, size, tsize

Fields inherited from class com.sun.labs.minion.indexer.entry.BaseEntry

dict, id, name, postIn

Constructor Summary

FeatureEntry()

FeatureEntry(java.lang.Object name)

Method Summary

void	decodePostingsInfo(ReadableBuffer b, int pos) Decodes the postings information associated with this entry.
void	encodePostingsInfo(WriteableBuffer b) Encodes any information associated with the postings onto the given buffer.
Entry	getEntry() Duplicates the contents of this entry, except for any postings.
Entry	getEntry(java.lang.Object name) Gets a new entry with the given name.
int	getMaxFDT() Gets the maximum frequency in the postings associated with this entry.
protected Postings	getPostings() Gets the appropriate postings type for the class.
protected Postings	getPostings(ReadableBuffer input) Reads the postings for this class, returning a set of postings useful at query time.
void	readPostings() Reads the postings data for this entry.
boolean	writePostings(PostingsOutput[] out, int[] idMap) Writes the postings associated with this entry to some or all of the given channels.

Methods inherited from class com.sun.labs.minion.indexer.entry.SinglePostingsEntry

add, append, copyData, getN, getNumChannels, getTotalOccurrences, hasFieldInformation, hasPositionInformation, iterator

Methods inherited from class com.sun.labs.minion.indexer.entry.BaseEntry

compareTo, getID, getName, getPartition, setDictionary, setID, setName, setPostingsInput, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

FeatureEntry

public FeatureEntry()

FeatureEntry

public FeatureEntry(java.lang.Object name)

Method Detail

getEntry

public Entry getEntry(java.lang.Object name)

Description copied from interface: Entry

Gets a new entry with the given name.

Parameters:

name - the name that we want to give the entry.

Returns:

a new entry.

getEntry

public Entry getEntry()

Duplicates the contents of this entry, except for any postings.

Specified by:

getEntry in interface Entry

Overrides:

getEntry in class SinglePostingsEntry

Returns:

a new entry containing a copy of hte data in this entry.

getPostings

protected Postings getPostings()

Gets the appropriate postings type for the class. These postings should be useable for indexing.

Specified by:

getPostings in class SinglePostingsEntry

Returns:

Postings suitable for use when indexing.

getPostings

protected Postings getPostings(ReadableBuffer input)

Reads the postings for this class, returning a set of postings useful at query time.

Specified by:

getPostings in class SinglePostingsEntry

Parameters:

input - The buffer containing the postings read from the postings file.

Returns:

The postings for this entry.

getMaxFDT

public int getMaxFDT()

Gets the maximum frequency in the postings associated with this entry. This is non-sensical for these postings, so we'll always return 1.

Specified by:

getMaxFDT in interface Entry

Overrides:

getMaxFDT in class SinglePostingsEntry

Returns:

1.

writePostings

public boolean writePostings(PostingsOutput[] out,
                             int[] idMap)
                      throws java.io.IOException

Writes the postings associated with this entry to some or all of the given channels.

Specified by:

writePostings in interface IndexEntry

Overrides:

writePostings in class SinglePostingsEntry

Parameters:

out - The outputs to which we will write the postings.

idMap - A map from the IDs currently used in the postings to the IDs that should be used when the postings are written to disk. This may be null, in which case no remapping will occur.

Returns:

true if postings were written, false otherwise

Throws:

java.io.IOException - if there is any error writing the postings.

encodePostingsInfo

public void encodePostingsInfo(WriteableBuffer b)

Encodes any information associated with the postings onto the given buffer.

Specified by:

encodePostingsInfo in interface IndexEntry

Overrides:

encodePostingsInfo in class SinglePostingsEntry

Parameters:

b - The buffer onto which the postings information should be encoded. The buffer will be positioned to the correct spot for the encoding.

decodePostingsInfo

public void decodePostingsInfo(ReadableBuffer b,
                               int pos)

Decodes the postings information associated with this entry.

Specified by:

decodePostingsInfo in interface QueryEntry

Overrides:

decodePostingsInfo in class SinglePostingsEntry

Parameters:

b - The buffer containing the encoded postings information.

pos - The position in b where the postings information can be found.

readPostings

public void readPostings()
                  throws java.io.IOException

Reads the postings data for this entry. This method must load all available postings information, since this will be used at dictionary merge time to append postings from one entry onto another.

Specified by:

readPostings in interface QueryEntry

Overrides:

readPostings in class SinglePostingsEntry

Throws:

java.io.IOException - if there is any error reading the postings.