fieldable.cs

Lucene.Net 版本源码 测试通过

/*
 * 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;

namespace Lucene.Net.Documents
{
	
	/// <summary> Synonymous with {@link Field}.
	/// 
	/// 
	/// </summary>
	public interface Fieldable
	{
		/// <summary>Sets the boost factor hits on this field.  This value will be
		/// multiplied into the score of all hits on this this field of this
		/// document.
		/// 
		/// <p>The boost is multiplied by {@link Lucene.Net.Documents.Document#GetBoost()} of the document
		/// containing this field.  If a document has multiple fields with the same
		/// name, all such values are multiplied together.  This product is then
		/// multipled by the value {@link Lucene.Net.Search.Similarity#LengthNorm(String,int)}, and
		/// rounded by {@link Lucene.Net.Search.Similarity#EncodeNorm(float)} before it is stored in the
		/// index.  One should attempt to ensure that this product does not overflow
		/// the range of that encoding.
		/// 
		/// </summary>
		/// <seealso cref="Lucene.Net.Documents.Document#SetBoost(float)">
		/// </seealso>
		/// <seealso cref="int)">
		/// </seealso>
		/// <seealso cref="Lucene.Net.Search.Similarity#EncodeNorm(float)">
		/// </seealso>
		void  SetBoost(float boost);
		
		/// <summary>Returns the boost factor for hits for this field.
		/// 
		/// <p>The default value is 1.0.
		/// 
		/// <p>Note: this value is not stored directly with the document in the index.
		/// Documents returned from {@link Lucene.Net.Index.IndexReader#Document(int)} and
		/// {@link Lucene.Net.Search.Hits#Doc(int)} may thus not have the same value present as when
		/// this field was indexed.
		/// 
		/// </summary>
		/// <seealso cref="#SetBoost(float)">
		/// </seealso>
		float GetBoost();
		
		/// <summary>Returns the name of the field as an interned string.
		/// For example "date", "title", "body", ...
		/// </summary>
		System.String Name();
		
		/// <summary>The value of the field as a String, or null.  If null, the Reader value
		/// or binary value is used.  Exactly one of stringValue(), readerValue(), and
		/// binaryValue() must be set. 
		/// </summary>
		System.String StringValue();
		
		/// <summary>The value of the field as a Reader, or null.  If null, the String value
		/// or binary value is  used.  Exactly one of stringValue(), readerValue(),
		/// and binaryValue() must be set. 
		/// </summary>
		System.IO.TextReader ReaderValue();
		
		/// <summary>The value of the field in Binary, or null.  If null, the Reader or
		/// String value is used.  Exactly one of stringValue(), readerValue() and
		/// binaryValue() must be set. 
		/// </summary>
		byte[] BinaryValue();
		
		/// <summary>True iff the value of the field is to be stored in the index for return
		/// with search hits.  It is an error for this to be true if a field is
		/// Reader-valued. 
		/// </summary>
		bool IsStored();
		
		/// <summary>True iff the value of the field is to be indexed, so that it may be
		/// searched on. 
		/// </summary>
		bool IsIndexed();
		
		/// <summary>True iff the value of the field should be tokenized as text prior to
		/// indexing.  Un-tokenized fields are indexed as a single word and may not be
		/// Reader-valued. 
		/// </summary>
		bool IsTokenized();
		
		/// <summary>True if the value of the field is stored and compressed within the index </summary>
		bool IsCompressed();
		
		/// <summary>True iff the term or terms used to index this field are stored as a term
		/// vector, available from {@link Lucene.Net.Index.IndexReader#GetTermFreqVector(int,String)}.
		/// These methods do not provide access to the original content of the field,
		/// only to terms used to index it. If the original content must be
		/// preserved, use the <code>stored</code> attribute instead.
		/// 
		/// </summary>
		/// <seealso cref="String)">
		/// </seealso>
		bool IsTermVectorStored();
		
		/// <summary> True iff terms are stored as term vector together with their offsets 
		/// (start and end positon in source text).
		/// </summary>
		bool IsStoreOffsetWithTermVector();
		
		/// <summary> True iff terms are stored as term vector together with their token positions.</summary>
		bool IsStorePositionWithTermVector();
		
		/// <summary>True iff the value of the filed is stored as binary </summary>
		bool IsBinary();
		
		/// <summary>True if norms are omitted for this indexed field </summary>
		bool GetOmitNorms();
		
		/// <summary>Expert:
		/// 
		/// If set, omit normalization factors associated with this indexed field.
		/// This effectively disables indexing boosts and length normalization for this field.
		/// </summary>
		void  SetOmitNorms(bool omitNorms);
		
		/// <summary> Indicates whether a Field is Lazy or not.  The semantics of Lazy loading are such that if a Field is lazily loaded, retrieving
		/// it's values via {@link #StringValue()} or {@link #BinaryValue()} is only valid as long as the {@link Lucene.Net.Index.IndexReader} that
		/// retrieved the {@link Document} is still open.
		/// 
		/// </summary>
		/// <returns> true if this field can be loaded lazily
		/// </returns>
		bool IsLazy();
	}
}