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DefFunction.cs
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DefFunction.cs
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// Lucene version compatibility level 4.8.1
using Lucene.Net.Index;
using Lucene.Net.Util;
using System.Collections;
using System.Collections.Generic;
namespace Lucene.Net.Queries.Function.ValueSources
{
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/// <summary>
/// <see cref="ValueSource"/> implementation which only returns the values from the provided
/// <see cref="ValueSource"/>s which are available for a particular docId. Consequently, when combined
/// with a <see cref="ConstValueSource"/>, this function serves as a way to return a default
/// value when the values for a field are unavailable.
/// </summary>
public class DefFunction : MultiFunction
{
public DefFunction(IList<ValueSource> sources)
: base(sources)
{
}
protected override string Name => "def";
public override FunctionValues GetValues(IDictionary fcontext, AtomicReaderContext readerContext)
{
return new ValuesAnonymousClass(this, ValsArr(m_sources, fcontext, readerContext));
}
private class ValuesAnonymousClass : Values
{
public ValuesAnonymousClass(DefFunction outerInstance, FunctionValues[] valsArr)
: base(outerInstance, valsArr)
{
upto = valsArr.Length - 1;
}
private readonly int upto;
private FunctionValues Get(int doc)
{
for (int i = 0; i < upto; i++)
{
FunctionValues vals = valsArr[i];
if (vals.Exists(doc))
{
return vals;
}
}
return valsArr[upto];
}
public override byte ByteVal(int doc)
{
return Get(doc).ByteVal(doc);
}
/// <summary>
/// NOTE: This was shortVal() in Lucene
/// </summary>
public override short Int16Val(int doc)
{
return Get(doc).Int16Val(doc);
}
/// <summary>
/// NOTE: This was floatVal() in Lucene
/// </summary>
public override float SingleVal(int doc)
{
return Get(doc).SingleVal(doc);
}
/// <summary>
/// NOTE: This was intVal() in Lucene
/// </summary>
public override int Int32Val(int doc)
{
return Get(doc).Int32Val(doc);
}
/// <summary>
/// NOTE: This was longVal() in Lucene
/// </summary>
public override long Int64Val(int doc)
{
return Get(doc).Int64Val(doc);
}
public override double DoubleVal(int doc)
{
return Get(doc).DoubleVal(doc);
}
public override string StrVal(int doc)
{
return Get(doc).StrVal(doc);
}
public override bool BoolVal(int doc)
{
return Get(doc).BoolVal(doc);
}
public override bool BytesVal(int doc, BytesRef target)
{
return Get(doc).BytesVal(doc, target);
}
public override object ObjectVal(int doc)
{
return Get(doc).ObjectVal(doc);
}
public override bool Exists(int doc)
{
// return true if any source is exists?
foreach (FunctionValues vals in valsArr)
{
if (vals.Exists(doc))
return true;
}
return false;
}
public override ValueFiller GetValueFiller()
{
// TODO: need ValueSource.type() to determine correct type
return base.GetValueFiller();
}
}
}
}