Searchable.cs
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上传日期:2013-09-30
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- /*
- * Copyright 2004 The Apache Software Foundation
- *
- * Licensed 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 Document = Lucene.Net.Documents.Document;
- using IndexReader = Lucene.Net.Index.IndexReader;
- using Term = Lucene.Net.Index.Term;
- namespace Lucene.Net.Search
- {
-
- /// <summary>The interface for search implementations.
- ///
- /// <p>Searchable is the abstract network protocol for searching.
- /// Implementations provide search over a single index, over multiple
- /// indices, and over indices on remote servers.
- ///
- /// <p>Queries, filters and sort criteria are designed to be compact so that
- /// they may be efficiently passed to a remote index, with only the top-scoring
- /// hits being returned, rather than every non-zero scoring hit.
- /// </summary>
-
- public interface Searchable
- {
- /// <summary>Lower-level search API.
- ///
- /// <p>{@link HitCollector#Collect(int,float)} is called for every non-zero
- /// scoring document.
- /// <br>HitCollector-based access to remote indexes is discouraged.
- ///
- /// <p>Applications should only use this if they need <i>all</i> of the
- /// matching documents. The high-level search API ({@link
- /// Searcher#Search(Query)}) is usually more efficient, as it skips
- /// non-high-scoring hits.
- ///
- /// </summary>
- /// <param name="query">to match documents
- /// </param>
- /// <param name="filter">if non-null, a bitset used to eliminate some documents
- /// </param>
- /// <param name="results">to receive hits
- /// </param>
- /// <throws> BooleanQuery.TooManyClauses </throws>
- /// <summary>
- /// </summary>
- /// <deprecated>
- /// </deprecated>
- void Search(Query query, Filter filter, HitCollector results);
- /// <summary>Expert: Low-level search implementation.
- /// Identical to {@link #Search(Query, Filter, HitCollector)}, but takes
- /// a Weight instead of a query.
- /// </summary>
- void Search(Weight weight, Filter filter, HitCollector results);
- /// <summary>Frees resources associated with this Searcher.
- /// Be careful not to call this method while you are still using objects
- /// like {@link Hits}.
- /// </summary>
- void Close();
-
- /// <summary>Expert: Returns the number of documents containing <code>term</code>.
- /// Called by search code to compute term weights.
- /// </summary>
- /// <seealso cref="IndexReader#docFreq(Term)">
- /// </seealso>
- int DocFreq(Term term);
-
- /// <summary>Expert: For each term in the terms array, calculates the number of
- /// documents containing <code>term</code>. Returns an array with these
- /// document frequencies. Used to minimize number of remote calls.
- /// </summary>
- int[] DocFreqs(Term[] terms);
-
- /// <summary>Expert: Returns one greater than the largest possible document number.
- /// Called by search code to compute term weights.
- /// </summary>
- /// <seealso cref="IndexReader#maxDoc()">
- /// </seealso>
- int MaxDoc();
-
- /// <summary>Expert: Low-level search implementation. Finds the top <code>n</code>
- /// hits for <code>query</code>, applying <code>filter</code> if non-null.
- ///
- /// <p>Called by {@link Hits}.
- ///
- /// <p>Applications should usually call {@link Searcher#Search(Query)} or
- /// {@link Searcher#Search(Query,Filter)} instead.
- /// </summary>
- /// <throws> BooleanQuery.TooManyClauses </throws>
- /// <summary>
- /// </summary>
- /// <deprecated>
- /// </deprecated>
- TopDocs Search(Query query, Filter filter, int n);
-
- /// <summary>Expert: Low-level search implementation.
- /// Identical to {@link #Search(Query, Filter, int)}, but takes
- /// a Weight instead of a query.
- /// </summary>
- TopDocs Search(Weight weight, Filter filter, int n);
-
- /// <summary>Expert: Returns the stored fields of document <code>i</code>.
- /// Called by {@link HitCollector} implementations.
- /// </summary>
- /// <seealso cref="IndexReader#document(int)">
- /// </seealso>
- Document Doc(int i);
-
- /// <summary>Expert: called to re-write queries into primitive queries.</summary>
- /// <throws> BooleanQuery.TooManyClauses </throws>
- Query Rewrite(Query query);
-
- /// <summary>Returns an Explanation that describes how <code>doc</code> scored against
- /// <code>query</code>.
- ///
- /// <p>This is intended to be used in developing Similarity implementations,
- /// and, for good performance, should not be displayed with every hit.
- /// Computing an explanation is as expensive as executing the query over the
- /// entire index.
- /// </summary>
- /// <throws> BooleanQuery.TooManyClauses </throws>
- Explanation Explain(Query query, int doc);
-
- /// <summary> Identical to {@link #Search(Query, Filter, HitCollector)}, but takes
- /// a Weight instead of a query.
- /// </summary>
- Explanation Explain(Weight weight, int doc);
-
- /// <summary>Expert: Low-level search implementation with arbitrary sorting. Finds
- /// the top <code>n</code> hits for <code>query</code>, applying
- /// <code>filter</code> if non-null, and sorting the hits by the criteria in
- /// <code>sort</code>.
- ///
- /// <p>Applications should usually call {@link
- /// Searcher#Search(Query,Filter,Sort)} instead.
- /// </summary>
- /// <throws> BooleanQuery.TooManyClauses </throws>
- /// <summary>
- /// </summary>
- /// <deprecated>
- /// </deprecated>
- TopFieldDocs Search(Query query, Filter filter, int n, Sort sort);
-
- /// <summary>Expert: Low-level search implementation.
- /// Identical to {@link #Search(Query, Filter, int, Sort)}, but takes
- /// a Weight instead of a query.
- /// </summary>
- TopFieldDocs Search(Weight weight, Filter filter, int n, Sort sort);
- }
- }