Lucene.Net
3.0.3
Lucene.Net is a port of the Lucene search engine library, written in C# and targeted at .NET runtime users.
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core
Search
Function
ValueSource.cs
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using
System;
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using
IndexReader
= Lucene.Net.Index.IndexReader;
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namespace
Lucene.Net.Search.Function
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{
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/// <summary> Expert: source of values for basic function queries.
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/// <p/>At its default/simplest form, values - one per doc - are used as the score of that doc.
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/// <p/>Values are instantiated as
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/// <see cref="Lucene.Net.Search.Function.DocValues">DocValues</see> for a particular reader.
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/// <p/>ValueSource implementations differ in RAM requirements: it would always be a factor
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/// of the number of documents, but for each document the number of bytes can be 1, 2, 4, or 8.
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///
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/// <p/><font color="#FF0000">
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/// WARNING: The status of the <b>Search.Function</b> package is experimental.
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/// The APIs introduced here might change in the future and will not be
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/// supported anymore in such a case.</font>
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///
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///
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/// </summary>
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[Serializable]
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public
abstract
class
ValueSource
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{
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/// <summary> Return the DocValues used by the function query.</summary>
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/// <param name="reader">the IndexReader used to read these values.
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/// If any caching is involved, that caching would also be IndexReader based.
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/// </param>
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/// <throws> IOException for any error. </throws>
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public
abstract
DocValues
GetValues(
IndexReader
reader);
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/// <summary> description of field, used in explain() </summary>
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public
abstract
System.String Description();
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/* (non-Javadoc) <see cref="java.lang.Object.toString() */
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public
override
System.String ToString()
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{
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return
Description();
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}
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/// <summary> Needed for possible caching of query results - used by <see cref="ValueSourceQuery.Equals(Object)" />.</summary>
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/// <seealso cref="Object.Equals(Object)">
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/// </seealso>
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abstract
public
override
bool
Equals(System.Object o);
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/// <summary> Needed for possible caching of query results - used by <see cref="ValueSourceQuery.GetHashCode()" />.</summary>
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/// <seealso cref="Object.GetHashCode()">
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/// </seealso>
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abstract
public
override
int
GetHashCode();
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}
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}
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