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#Apache lucene javadoc code#
Some simple examples of code which does this are: Which implements files as memory-resident data structures.Ĭontains a few handy data structures and util classes, ie OpenBitSetĪnd add documents to it with AddDocument Which uses a file system directory to store files, and RAMDirectory Multiple implementations are provided, including FSDirectory, Which is a collection of named files written by an IndexOutput Provides data structures to represent queries (ie TermQueryįor boolean combinations of queries) and the IndexSearcherĪ number of QueryParsers are provided for producingĭefines an abstract class for storing persistent data, the Directory, Which creates and adds documents to indices and IndexReader, Provides two primary classes: IndexWriter,
Whose values may be strings or instances of java.io.Reader}. A Document is simply a set of named Fields, Provides an abstraction over the encoding and decoding of the inverted index structure,Īs well as different implementations that can be chosen depending upon application needs.Ĭlass. Tokenizers and TokenFilters are strung together and applied with an Analyzer.Īnalyzers-common provides a number of Analyzer implementations, including The Lucene API is divided into several packages:ĪPI for converting text from a java.io.Reader}Ī TokenStream can be composed by applying TokenFilters ScoreDoc hits = arch(query, null, 1000).scoreDocs QueryParser parser = new QueryParser(Version.LUCENE_CURRENT, "fieldname", analyzer) Parse a simple query that searches for "text": IndexSearcher isearcher = new IndexSearcher(ireader) String text = "This is the text to be indexed." ĭoc.add(new Field("fieldname", text, TextField.TYPE_STORED)) ĭirectoryReader ireader = DirectoryReader.open(directory) IndexWriter iwriter = new IndexWriter(directory, config) IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_CURRENT, analyzer) Directory directory = FSDirectory.open("/tmp/testindex") To store an index on disk, use this instead: Here's a simple example how to use Lucene for indexing and searching (using JUnit to check if the results are what we expect): Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT) ĭirectory directory = new RAMDirectory() Apache Lucene is a high-performance, full-featured text search engine library.
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