Package generic.lsh.vector

Class HashEntry

java.lang.Object

generic.lsh.vector.HashEntry

public class HashEntry
extends java.lang.Object

Constructor Summary

Constructors

Constructor	Description
HashEntry()
HashEntry(int h, int tcnt, double weight)	Create a hash entry with an explicit weight
HashEntry(int h, int tcnt, int dcnt, WeightFactory w)	Create a hash entry with a weight calculated from its term frequency and idf frequency

Method Summary

Modifier and Type	Method	Description
boolean	equals(java.lang.Object obj)	Eclipse-generated equals function.
double	getCoeff()
int	getHash()
short	getIDF()
short	getTF()
int	hashCode()	Eclipse-generated hash function.
boolean	restoreBase64(char[] buffer, int offset, int[] decoder, WeightFactory w, IDFLookup lookup)
int	restoreSQL(java.lang.String sql, int start, WeightFactory w, IDFLookup lookup)
void	restoreXml(XmlPullParser parser, WeightFactory w)
void	restoreXml(XmlPullParser parser, WeightFactory w, IDFLookup lookup)	Restore entry but recalculate the idf
void	saveBase64(char[] buffer, int offset, char[] encoder)
void	saveSQL(java.lang.StringBuilder buf)
void	saveXml(java.io.Writer fwrite)

Methods inherited from class java.lang.Object

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

Constructor Detail

HashEntry

public HashEntry()

HashEntry

public HashEntry(int h,
                 int tcnt,
                 double weight)

Create a hash entry with an explicit weight

Parameters:

h - is the 32-bit hash

tcnt - is the (optional) term-frequency count (set to 1 if not using)

weight - is the weight associated with the hash

HashEntry

public HashEntry(int h,
                 int tcnt,
                 int dcnt,
                 WeightFactory w)

Create a hash entry with a weight calculated from its term frequency and idf frequency

Parameters:

h - is the 32-bit hash

tcnt - is the term frequency count

dcnt - is the (normalized) idf frequency (should be generated by an IDFLookup)

w - is the factory used to generate the final weight

Method Detail

hashCode

public int hashCode()

Eclipse-generated hash function.

Overrides:

hashCode in class java.lang.Object

Returns:

equals

public boolean equals(java.lang.Object obj)

Eclipse-generated equals function.

Overrides:

equals in class java.lang.Object

Parameters:

obj -

Returns:

getHash

public int getHash()

getTF

public short getTF()

getIDF

public short getIDF()

getCoeff

public double getCoeff()

saveXml

public void saveXml(java.io.Writer fwrite)
             throws java.io.IOException

Throws:

java.io.IOException

saveSQL

public void saveSQL(java.lang.StringBuilder buf)

restoreXml

public void restoreXml(XmlPullParser parser,
                       WeightFactory w)

restoreXml

public void restoreXml(XmlPullParser parser,
                       WeightFactory w,
                       IDFLookup lookup)

Restore entry but recalculate the idf

Parameters:

parser - // xml state

w - // weight factory to calculate coefficient with

lookup - // lookup object to recalculate idf

restoreSQL

public int restoreSQL(java.lang.String sql,
                      int start,
                      WeightFactory w,
                      IDFLookup lookup)
               throws java.io.IOException

Throws:

java.io.IOException

restoreBase64

public boolean restoreBase64(char[] buffer,
                             int offset,
                             int[] decoder,
                             WeightFactory w,
                             IDFLookup lookup)

saveBase64

public void saveBase64(char[] buffer,
                       int offset,
                       char[] encoder)