/*
* 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 System;
using IndexReader = Lucene.Net.Index.IndexReader;
using ReaderUtil = Lucene.Net.Util.ReaderUtil;
using Explanation = Lucene.Net.Search.Explanation;
namespace Lucene.Net.Search.Function
{
/// This class wraps another ValueSource, but protects
/// against accidental double RAM usage in FieldCache when
/// a composite reader is passed to .
///
/// NOTE: this class adds a CPU penalty to every
/// lookup, as it must resolve the incoming document to the
/// right sub-reader using a binary search.
///
///
/// This class is temporary, to ease the
/// migration to segment-based searching. Please change your
/// code to not pass composite readers to these APIs.
///
[Obsolete("This class is temporary, to ease the migration to segment-based searching. Please change your code to not pass composite readers to these APIs. ")]
[Serializable]
public sealed class MultiValueSource:ValueSource
{
internal ValueSource other;
public MultiValueSource(ValueSource other)
{
this.other = other;
}
public override DocValues GetValues(IndexReader reader)
{
IndexReader[] subReaders = reader.GetSequentialSubReaders();
if (subReaders != null)
{
// This is a composite reader
return new MultiDocValues(this, subReaders);
}
else
{
// Already an atomic reader -- just delegate
return other.GetValues(reader);
}
}
public override System.String Description()
{
return other.Description();
}
public override bool Equals(System.Object o)
{
if (o is MultiValueSource)
{
return ((MultiValueSource) o).other.Equals(other);
}
else
{
return false;
}
}
public override int GetHashCode()
{
return 31 * other.GetHashCode();
}
private sealed class MultiDocValues:DocValues
{
private void InitBlock(MultiValueSource enclosingInstance)
{
this.enclosingInstance = enclosingInstance;
}
private MultiValueSource enclosingInstance;
public MultiValueSource Enclosing_Instance
{
get
{
return enclosingInstance;
}
}
internal DocValues[] docValues;
internal int[] docStarts;
internal MultiDocValues(MultiValueSource enclosingInstance, IndexReader[] subReaders)
{
InitBlock(enclosingInstance);
docValues = new DocValues[subReaders.Length];
docStarts = new int[subReaders.Length];
int base_Renamed = 0;
for (int i = 0; i < subReaders.Length; i++)
{
docValues[i] = Enclosing_Instance.other.GetValues(subReaders[i]);
docStarts[i] = base_Renamed;
base_Renamed += subReaders[i].MaxDoc();
}
}
public override float FloatVal(int doc)
{
int n = ReaderUtil.SubIndex(doc, docStarts);
return docValues[n].FloatVal(doc - docStarts[n]);
}
public override int IntVal(int doc)
{
int n = ReaderUtil.SubIndex(doc, docStarts);
return docValues[n].IntVal(doc - docStarts[n]);
}
public override long LongVal(int doc)
{
int n = ReaderUtil.SubIndex(doc, docStarts);
return docValues[n].LongVal(doc - docStarts[n]);
}
public override double DoubleVal(int doc)
{
int n = ReaderUtil.SubIndex(doc, docStarts);
return docValues[n].DoubleVal(doc - docStarts[n]);
}
public override System.String StrVal(int doc)
{
int n = ReaderUtil.SubIndex(doc, docStarts);
return docValues[n].StrVal(doc - docStarts[n]);
}
public override System.String ToString(int doc)
{
int n = ReaderUtil.SubIndex(doc, docStarts);
return docValues[n].ToString(doc - docStarts[n]);
}
public override Explanation Explain(int doc)
{
int n = ReaderUtil.SubIndex(doc, docStarts);
return docValues[n].Explain(doc - docStarts[n]);
}
}
}
}