| /* |
| * 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.Index |
| { |
| |
| /// <summary> TermPositions provides an interface for enumerating the <document, |
| /// frequency, <position>* > tuples for a term. <p/> The document and |
| /// frequency are the same as for a TermDocs. The positions portion lists the ordinal |
| /// positions of each occurrence of a term in a document. |
| /// |
| /// </summary> |
| /// <seealso cref="IndexReader.TermPositions()"> |
| /// </seealso> |
| |
| public interface TermPositions : TermDocs |
| { |
| /// <summary>Returns next position in the current document. It is an error to call |
| /// this more than <see cref="TermDocs.Freq()" /> times |
| /// without calling <see cref="TermDocs.Next()" /><p/> This is |
| /// invalid until <see cref="TermDocs.Next()" /> is called for |
| /// the first time. |
| /// </summary> |
| int NextPosition(); |
| |
| /// <summary> Returns the length of the payload at the current term position. |
| /// This is invalid until <see cref="NextPosition()" /> is called for |
| /// the first time.<br/> |
| /// </summary> |
| /// <value> length of the current payload in number of bytes </value> |
| int PayloadLength { get; } |
| |
| /// <summary> Returns the payload data at the current term position. |
| /// This is invalid until <see cref="NextPosition()" /> is called for |
| /// the first time. |
| /// This method must not be called more than once after each call |
| /// of <see cref="NextPosition()" />. However, payloads are loaded lazily, |
| /// so if the payload data for the current position is not needed, |
| /// this method may not be called at all for performance reasons.<br/> |
| /// |
| /// </summary> |
| /// <param name="data">the array into which the data of this payload is to be |
| /// stored, if it is big enough; otherwise, a new byte[] array |
| /// is allocated for this purpose. |
| /// </param> |
| /// <param name="offset">the offset in the array into which the data of this payload |
| /// is to be stored. |
| /// </param> |
| /// <returns> a byte[] array containing the data of this payload |
| /// </returns> |
| /// <throws> IOException </throws> |
| byte[] GetPayload(byte[] data, int offset); |
| |
| /// <summary> Checks if a payload can be loaded at this position. |
| /// <p/> |
| /// Payloads can only be loaded once per call to |
| /// <see cref="NextPosition()" />. |
| /// |
| /// </summary> |
| /// <value> true if there is a payload available at this position that can be loaded </value> |
| bool IsPayloadAvailable { get; } |
| } |
| } |