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DocValues.cs
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DocValues.cs
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using System;
namespace Lucene.Net.Index
{
/*
* 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.
*/
using IBits = Lucene.Net.Util.IBits;
using BytesRef = Lucene.Net.Util.BytesRef;
/// <summary>
/// This class contains utility methods and constants for <see cref="DocValues"/>
/// </summary>
public sealed class DocValues
{
/* no instantiation */
private DocValues()
{
}
/// <summary>
/// An empty <see cref="BinaryDocValues"/> which returns <see cref="BytesRef.EMPTY_BYTES"/> for every document
/// </summary>
public static readonly BinaryDocValues EMPTY_BINARY = new BinaryDocValuesAnonymousClass();
private class BinaryDocValuesAnonymousClass : BinaryDocValues
{
public BinaryDocValuesAnonymousClass()
{
}
public override void Get(int docID, BytesRef result)
{
result.Bytes = BytesRef.EMPTY_BYTES;
result.Offset = 0;
result.Length = 0;
}
}
/// <summary>
/// An empty <see cref="NumericDocValues"/> which returns zero for every document
/// </summary>
public static readonly NumericDocValues EMPTY_NUMERIC = new NumericDocValuesAnonymousClass();
private class NumericDocValuesAnonymousClass : NumericDocValues
{
public NumericDocValuesAnonymousClass()
{
}
public override long Get(int docID)
{
return 0;
}
}
/// <summary>
/// An empty <see cref="SortedDocValues"/> which returns <see cref="BytesRef.EMPTY_BYTES"/> for every document
/// </summary>
public static readonly SortedDocValues EMPTY_SORTED = new SortedDocValuesAnonymousClass();
private class SortedDocValuesAnonymousClass : SortedDocValues
{
public SortedDocValuesAnonymousClass()
{
}
public override int GetOrd(int docID)
{
return -1;
}
public override void LookupOrd(int ord, BytesRef result)
{
result.Bytes = BytesRef.EMPTY_BYTES;
result.Offset = 0;
result.Length = 0;
}
public override int ValueCount => 0;
}
/// <summary>
/// An empty <see cref="SortedDocValues"/> which returns <see cref="SortedSetDocValues.NO_MORE_ORDS"/> for every document
/// </summary>
public static readonly SortedSetDocValues EMPTY_SORTED_SET = new RandomAccessOrdsAnonymousClass();
private class RandomAccessOrdsAnonymousClass : RandomAccessOrds
{
public RandomAccessOrdsAnonymousClass()
{
}
public override long NextOrd()
{
return NO_MORE_ORDS;
}
public override void SetDocument(int docID)
{
}
public override void LookupOrd(long ord, BytesRef result)
{
throw new IndexOutOfRangeException();
}
public override long ValueCount => 0;
public override long OrdAt(int index)
{
throw new IndexOutOfRangeException();
}
public override int Cardinality()
{
return 0;
}
}
/// <summary>
/// Returns a multi-valued view over the provided <see cref="SortedDocValues"/>
/// </summary>
public static SortedSetDocValues Singleton(SortedDocValues dv)
{
return new SingletonSortedSetDocValues(dv);
}
/// <summary>
/// Returns a single-valued view of the <see cref="SortedSetDocValues"/>, if it was previously
/// wrapped with <see cref="Singleton"/>, or <c>null</c>.
/// </summary>
public static SortedDocValues UnwrapSingleton(SortedSetDocValues dv)
{
if (dv is SingletonSortedSetDocValues singletonSortedSetDocValues)
{
return singletonSortedSetDocValues.SortedDocValues;
}
else
{
return null;
}
}
/// <summary>
/// Returns a <see cref="IBits"/> representing all documents from <paramref name="dv"/> that have a value.
/// </summary>
public static IBits DocsWithValue(SortedDocValues dv, int maxDoc)
{
return new BitsAnonymousClass(dv, maxDoc);
}
private class BitsAnonymousClass : IBits
{
private readonly SortedDocValues dv;
private readonly int maxDoc;
public BitsAnonymousClass(SortedDocValues dv, int maxDoc)
{
this.dv = dv;
this.maxDoc = maxDoc;
}
public virtual bool Get(int index)
{
return dv.GetOrd(index) >= 0;
}
public virtual int Length => maxDoc;
}
/// <summary>
/// Returns a <see cref="IBits"/> representing all documents from <paramref name="dv"/> that have a value.
/// </summary>
public static IBits DocsWithValue(SortedSetDocValues dv, int maxDoc)
{
return new BitsAnonymousClass2(dv, maxDoc);
}
private class BitsAnonymousClass2 : IBits
{
private readonly SortedSetDocValues dv;
private readonly int maxDoc;
public BitsAnonymousClass2(SortedSetDocValues dv, int maxDoc)
{
this.dv = dv;
this.maxDoc = maxDoc;
}
public virtual bool Get(int index)
{
dv.SetDocument(index);
return dv.NextOrd() != SortedSetDocValues.NO_MORE_ORDS;
}
public virtual int Length => maxDoc;
}
}
}