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https://issues.apache.org/jira/browse/LUCENE-5370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13942986#comment-13942986
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Rob Audenaerde commented on LUCENE-5370:
----------------------------------------
I currently use the code below:
{code}
private FacetResult getTopValueChildren( int topN, final SortDir
sortDir, String dim, String... path ) throws IOException
{
if ( topN <= 0 )
{
throw new IllegalArgumentException( "topN must be > 0
(got: " + topN + ")" );
}
DimConfig dimConfig = this.verifyDim( dim );
FacetLabel cp = new FacetLabel( dim, path );
int dimOrd = this.taxoReader.getOrdinal( cp );
if ( dimOrd == -1 )
{
return null;
}
TopOrdAndLabelQueue q = new TopOrdAndLabelQueue( Math.min(
this.taxoReader.getSize(), topN ) )
{
@Override
protected boolean lessThan( OrdAndLabel a, OrdAndLabel
b )
{
if ( sortDir == SortDir.DESC )
{
return super.lessThan( a, b );
}
else
{
return !super.lessThan( a, b );
}
}
};
int ord = this.children[dimOrd];
int totValue = 0;
int childCount = 0;
TopOrdAndLabelQueue.OrdAndLabel reuse = null;
while ( ord != TaxonomyReader.INVALID_ORDINAL )
{
if ( this.values[ord] > 0 )
{
totValue += this.values[ord];
childCount++;
if ( reuse == null )
{
reuse = new
TopOrdAndLabelQueue.OrdAndLabel();
}
reuse.ord = ord;
reuse.value = this.values[ord];
reuse.label = this.taxoReader.getPath( ord
).components[cp.length];
reuse = q.insertWithOverflow( reuse );
}
ord = this.siblings[ord];
}
if ( totValue == 0 )
{
return null;
}
if ( dimConfig.multiValued )
{
if ( dimConfig.requireDimCount )
{
totValue = this.values[dimOrd];
}
else
{
// Our sum'd value is not correct, in general:
totValue = -1;
}
}
else
{
// Our sum'd dim value is accurate, so we keep it
}
LabelAndValue[] labelValues = new LabelAndValue[q.size()];
for ( int i = labelValues.length - 1; i >= 0; i-- )
{
TopOrdAndLabelQueue.OrdAndLabel ordAndValue = q.pop();
labelValues[i] = new LabelAndValue( ordAndValue.label,
ordAndValue.value );
}
return new FacetResult( dim, path, totValue, labelValues,
childCount );
}
{code}
> Sorting Facets on CategoryPath (Label)
> --------------------------------------
>
> Key: LUCENE-5370
> URL: https://issues.apache.org/jira/browse/LUCENE-5370
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/facet
> Affects Versions: 4.6
> Reporter: Rob Audenaerde
> Labels: features
>
> Facet support sorting through {{FacetRequest.SortOrder}}. This is used in the
> {{ResultSortUtils}}. For my application it would be very nice if the facets
> can also be sorted on their label.
> I think this could be accomplished by altering {{FacetRequest}} with an extra
> enum {{SortType}}, and two extra {{Heap}} in {{ResultSortUtils}} which
> instead of comparing the double value, compare the CategoryPath.
> What do you think of this idea? Or could the same behaviour be accomplished
> in a different way already?
> (btw: I tried building this patch on the trunk of lucene5.0; but I couldn't
> get the maven build to build correctly. I will try again lateron on the 4.6
> branch.
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