| using System.Diagnostics; |
| |
| namespace Lucene.Net.Index |
| { |
| using Lucene.Net.Support; |
| |
| /* |
| * 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 BytesRef = Lucene.Net.Util.BytesRef; |
| |
| /// <summary> |
| /// Maintains a <seealso cref="IndexReader"/> <seealso cref="TermState"/> view over |
| /// <seealso cref="IndexReader"/> instances containing a single term. The |
| /// <seealso cref="TermContext"/> doesn't track if the given <seealso cref="TermState"/> |
| /// objects are valid, neither if the <seealso cref="TermState"/> instances refer to the |
| /// same terms in the associated readers. |
| /// |
| /// @lucene.experimental |
| /// </summary> |
| public sealed class TermContext |
| { |
| /// <summary> |
| /// Holds the <seealso cref="IndexReaderContext"/> of the top-level |
| /// <seealso cref="IndexReader"/>, used internally only for |
| /// asserting. |
| /// |
| /// @lucene.internal |
| /// </summary> |
| public readonly IndexReaderContext TopReaderContext; |
| |
| private readonly TermState[] States; |
| private int docFreq; |
| private long totalTermFreq; |
| |
| //public static boolean DEBUG = BlockTreeTermsWriter.DEBUG; |
| |
| /// <summary> |
| /// Creates an empty <seealso cref="TermContext"/> from a <seealso cref="IndexReaderContext"/> |
| /// </summary> |
| public TermContext(IndexReaderContext context) |
| { |
| Debug.Assert(context != null && context.IsTopLevel); |
| TopReaderContext = context; |
| docFreq = 0; |
| int len; |
| if (context.Leaves == null) |
| { |
| len = 1; |
| } |
| else |
| { |
| len = context.Leaves.Count; |
| } |
| States = new TermState[len]; |
| } |
| |
| /// <summary> |
| /// Creates a <seealso cref="TermContext"/> with an initial <seealso cref="TermState"/>, |
| /// <seealso cref="IndexReader"/> pair. |
| /// </summary> |
| public TermContext(IndexReaderContext context, TermState state, int ord, int docFreq, long totalTermFreq) |
| : this(context) |
| { |
| Register(state, ord, docFreq, totalTermFreq); |
| } |
| |
| /// <summary> |
| /// Creates a <seealso cref="TermContext"/> from a top-level <seealso cref="IndexReaderContext"/> and the |
| /// given <seealso cref="Term"/>. this method will lookup the given term in all context's leaf readers |
| /// and register each of the readers containing the term in the returned <seealso cref="TermContext"/> |
| /// using the leaf reader's ordinal. |
| /// <p> |
| /// Note: the given context must be a top-level context. |
| /// </summary> |
| public static TermContext Build(IndexReaderContext context, Term term) |
| { |
| Debug.Assert(context != null && context.IsTopLevel); |
| string field = term.Field; |
| BytesRef bytes = term.Bytes; |
| TermContext perReaderTermState = new TermContext(context); |
| //if (DEBUG) System.out.println("prts.build term=" + term); |
| foreach (AtomicReaderContext ctx in context.Leaves) |
| { |
| //if (DEBUG) System.out.println(" r=" + leaves[i].reader); |
| Fields fields = ctx.AtomicReader.Fields; |
| if (fields != null) |
| { |
| Terms terms = fields.Terms(field); |
| if (terms != null) |
| { |
| TermsEnum termsEnum = terms.Iterator(null); |
| if (termsEnum.SeekExact(bytes)) |
| { |
| TermState termState = termsEnum.TermState(); |
| //if (DEBUG) System.out.println(" found"); |
| perReaderTermState.Register(termState, ctx.Ord, termsEnum.DocFreq(), termsEnum.TotalTermFreq()); |
| } |
| } |
| } |
| } |
| return perReaderTermState; |
| } |
| |
| /// <summary> |
| /// Clears the <seealso cref="TermContext"/> internal state and removes all |
| /// registered <seealso cref="TermState"/>s |
| /// </summary> |
| public void Clear() |
| { |
| docFreq = 0; |
| Arrays.Fill(States, null); |
| } |
| |
| /// <summary> |
| /// Registers and associates a <seealso cref="TermState"/> with an leaf ordinal. The leaf ordinal |
| /// should be derived from a <seealso cref="IndexReaderContext"/>'s leaf ord. |
| /// </summary> |
| public void Register(TermState state, int ord, int docFreq, long totalTermFreq) |
| { |
| Debug.Assert(state != null, "state must not be null"); |
| Debug.Assert(ord >= 0 && ord < States.Length); |
| Debug.Assert(States[ord] == null, "state for ord: " + ord + " already registered"); |
| this.docFreq += docFreq; |
| if (this.totalTermFreq >= 0 && totalTermFreq >= 0) |
| { |
| this.totalTermFreq += totalTermFreq; |
| } |
| else |
| { |
| this.totalTermFreq = -1; |
| } |
| States[ord] = state; |
| } |
| |
| /// <summary> |
| /// Returns the <seealso cref="TermState"/> for an leaf ordinal or <code>null</code> if no |
| /// <seealso cref="TermState"/> for the ordinal was registered. |
| /// </summary> |
| /// <param name="ord"> |
| /// the readers leaf ordinal to get the <seealso cref="TermState"/> for. </param> |
| /// <returns> the <seealso cref="TermState"/> for the given readers ord or <code>null</code> if no |
| /// <seealso cref="TermState"/> for the reader was registered </returns> |
| public TermState Get(int ord) |
| { |
| Debug.Assert(ord >= 0 && ord < States.Length); |
| return States[ord]; |
| } |
| |
| /// <summary> |
| /// Returns the accumulated term frequency of all <seealso cref="TermState"/> |
| /// instances passed to <seealso cref="#register(TermState, int, int, long)"/>. </summary> |
| /// <returns> the accumulated term frequency of all <seealso cref="TermState"/> |
| /// instances passed to <seealso cref="#register(TermState, int, int, long)"/>. </returns> |
| public long TotalTermFreq() |
| { |
| return totalTermFreq; |
| } |
| |
| /// <summary> |
| /// expert: only available for queries that want to lie about docfreq |
| /// @lucene.internal |
| /// </summary> |
| public int DocFreq |
| { |
| set |
| { |
| this.docFreq = value; |
| } |
| get |
| { |
| return docFreq; |
| } |
| } |
| } |
| } |