![]() This class is loosely based on the Lucene (java implementation) demo class #!/usr/bin/env python INDEX_DIR = "IndexFiles.index" import jieba import sys, os, lucene, threading, time from datetime import datetime from java.io import File from .miscellaneous import LimitTokenCountAnalyzer from .core import WhitespaceAnalyzer from import Document, Field, FieldType from import FieldInfo, IndexWriter, IndexWriterConfig from import SimpleFSDirectory from import Version """ Thing is that there is no relationship between Store and Index. The results are printed in pages,įield is the base element in a document. SearchFiles uses the arch(query,n) method that Lucene query syntax into the corresponding Query object. The query parser just enables decoding the Possible to programmatically construct a rich Query object without QueryParser which is passed to the searcher. The Query object contains the results from the The same way the documents are interpreted: finding wordīoundaries, downcasing, and removing useless words like ‘a’, ‘an’Īnd ‘the’. The query parser isĬonstructed with an analyzer used to interpret your query text in IndexFiles class as well) and a QueryParser. With an IndexSearcher, StandardAnalyzer, (which is used in the The index if it exists and then adding the new document to the Our case, the file path serves as the identifier) deleting it from To find an already-indexed document with the same identifier (in #Apache lucene demo update#Index, the IndexWriter will update them in the index by attempting OpenMode.CREATE_OR_APPEND, and rather than adding documents to the Is given, the IndexWriterConfig OpenMode will be set to These instancesĪre added to the IndexWriter. The file as well as its creation time and location. Theĭocument is simply a data object to represent the text content from This recursiveįunction crawls the directories and creates Document objects. Instantiated, you should see the indexDocs() code. Looking further down in the file, after IndexWriter is The value of the -update command-line parameter. For example, we set the OpenMode to use here based on The IndexWriterConfig instance holds all configuration for Lucene/analysis/common/src/java/org/apache/lucene/analysis). Lucene currently provides Analyzers for a number of different It should be noted that there are different rules forĮvery language, and you should use the proper analyzer for each. (a, an, the, etc.) and other tokens that may have less value for Stopwords are common language words such as articles Standard Annex #29 converts tokens to lowercase and then filters StandardAnalyzer, which creates tokens using the Word Break rulesįrom the Unicode Text Segmentation algorithm specified in Unicode downcasing, synonym insertion,įiltering out unwanted tokens, etc. Lucene Analyzers are processing pipelines that break up text into Using, there are several other Directory subclasses that can write In addition to the FSDirectory implementation we are Lucene Directorys are used by the IndexWriter to store information IndexFiles will first wipe the slate clean before indexing any The -update command-line parameter tells IndexFiles not to delete The -docs command-line parameter value is the location of theĭirectory containing files to be indexed. Platforms, the index path may be created in a different directory Used, the index path will be created as a subdirectory of theĬurrent working directory (if it does not already exist). Not given, causing the default relative index path “index” to be If IndexFiles is invoked with a relative path given in the -indexĬommand-line parameter, or if the -index command-line parameter is The value of the -index command-line parameter is the name of theįilesystem directory where all index information should be stored. Instantiates StandardAnalyzer and IndexWriterConfig. Preparation for instantiating IndexWriter, opens a Directory, and The main() method parses the command-line parameters, then in The IndexFiles class creates a Lucene Index. It is a technology suitable for nearly any application that requiresįull-text search, especially cross-platform.įull-text search can be divided into two process including indexing and search. It is is a high-performance,įull-featured text search engine library written entirely in Java. The Apache LuceneTM project develops open-source search software, ![]()
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