Github user laimis commented on a diff in the pull request:
https://github.com/apache/lucenenet/pull/64#discussion_r23741072
--- Diff: src/Lucene.Net.Expressions/ExpressionComparator.cs ---
@@ -0,0 +1,94 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using Lucene.Net.Index;
+using Lucene.Net.Queries.Function;
+using Lucene.Net.Search;
+using Lucene.Net.Support;
+
+namespace Lucene.Net.Expressions
+{
+ /// <summary>A custom comparator for sorting documents by an
expression</summary>
+ internal class ExpressionComparator : FieldComparator<double>
+ {
+ private readonly double[] values;
+
+ private double bottom;
+
+ private double topValue;
+
+ private ValueSource source;
+
+ private FunctionValues scores;
+
+ private AtomicReaderContext readerContext;
+
+ public ExpressionComparator(ValueSource source, int numHits)
+ {
+ values = new double[numHits];
+ this.source = source;
+ }
+
+ // TODO: change FieldComparator.setScorer to throw IOException
and remove this try-catch
+ public override Scorer Scorer
+ {
+ set
+ {
+ base.Scorer = value;
+ // TODO: might be cleaner to lazy-init 'source' and set
scorer after?
+
+ Debug.Assert(readerContext != null);
+ var context = new Dictionary<string, object>();
+ Debug.Assert(value != null);
+ context["scorer"] = value;
+ scores = source.GetValues(context, readerContext);
+ }
+ }
+
+ public override int Compare(int slot1, int slot2)
+ {
+ return values[slot1].CompareTo(values[slot2]);
--- End diff --
indentation
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