org.apache.jackrabbit.core.query.lucene
Class FieldComparatorBase

java.lang.Object
  org.apache.lucene.search.FieldComparator
      org.apache.jackrabbit.core.query.lucene.FieldComparatorBase

Direct Known Subclasses:

AbstractFieldComparator

public abstract class FieldComparatorBase
extends org.apache.lucene.search.FieldComparator

Abstract base class for FieldComparator implementations which are based on values in the form of Comparables.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.search.FieldComparator

org.apache.lucene.search.FieldComparator.ByteComparator, org.apache.lucene.search.FieldComparator.DocComparator, org.apache.lucene.search.FieldComparator.DoubleComparator, org.apache.lucene.search.FieldComparator.FloatComparator, org.apache.lucene.search.FieldComparator.IntComparator, org.apache.lucene.search.FieldComparator.LongComparator, org.apache.lucene.search.FieldComparator.RelevanceComparator, org.apache.lucene.search.FieldComparator.ShortComparator, org.apache.lucene.search.FieldComparator.StringComparatorLocale, org.apache.lucene.search.FieldComparator.StringOrdValComparator, org.apache.lucene.search.FieldComparator.StringValComparator

Constructor Summary

FieldComparatorBase()

Method Summary

protected int	compare(Comparable<?> val1, Comparable<?> val2) Compare two values
int	compare(int slot1, int slot2)
int	compareBottom(int doc)
void	copy(int slot, int doc)
protected abstract Comparable<?>	getValue(int slot) Retrieves the value of a given slot
void	setBottom(int slot)
protected abstract void	setValue(int slot, Comparable<?> value) Puts a value into a given slot
protected abstract Comparable<?>	sortValue(int doc) Value for a document
Comparable<?>	value(int slot)

Methods inherited from class org.apache.lucene.search.FieldComparator

binarySearch, binarySearch, setNextReader, setScorer

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldComparatorBase

public FieldComparatorBase()

Method Detail

sortValue

protected abstract Comparable<?> sortValue(int doc)

Value for a document

Parameters:

doc - id of the document

Returns:

the value for the given id

getValue

protected abstract Comparable<?> getValue(int slot)

Retrieves the value of a given slot

Parameters:

slot - index of the value to retrieve

Returns:

the value in the given slot

setValue

protected abstract void setValue(int slot,
                                 Comparable<?> value)

Puts a value into a given slot

Parameters:

slot - index where to put the value

value - the value to put into the given slot

compare

public int compare(int slot1,
                   int slot2)

Specified by:

compare in class org.apache.lucene.search.FieldComparator

compareBottom

public int compareBottom(int doc)
                  throws IOException

Specified by:

compareBottom in class org.apache.lucene.search.FieldComparator

Throws:

IOException

setBottom

public void setBottom(int slot)

Specified by:

setBottom in class org.apache.lucene.search.FieldComparator

compare

protected int compare(Comparable<?> val1,
                      Comparable<?> val2)

Compare two values

Parameters:

val1 - first value

val2 - second value

Returns:

A negative integer if val1 comes before val2, a positive integer if val1 comes after val2 and 0 if val1 and val2 are equal.

copy

public void copy(int slot,
                 int doc)
          throws IOException

Specified by:

copy in class org.apache.lucene.search.FieldComparator

Throws:

IOException

value

public Comparable<?> value(int slot)

Specified by:

value in class org.apache.lucene.search.FieldComparator