Groovy example source code file (Searcher.groovy)

This example Groovy source code file (Searcher.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

exception, exception, file, found, index, indexer, open, parse, query, query, retrieve, search, standardanalyzer, usage

The Groovy Searcher.groovy source code

import org.apache.lucene.analysis.standard.StandardAnalyzer
import org.apache.lucene.queryParser.QueryParser
import org.apache.lucene.search.IndexSearcher
import org.apache.lucene.store.FSDirectory

/**
 * Searcher: searches a Lucene index for a query passed as an argument
 *
 * @author Jeremy Rayner <groovy@ross-rayner.com>
 * based on examples in the wonderful 'Lucene in Action' book
 * by Erik Hatcher and Otis Gospodnetic ( http://www.lucenebook.com )
 *
 * requires a lucene-1.x.x.jar from http://lucene.apache.org
 */

if (args.size() != 2) {
    throw new Exception("Usage: groovy -cp lucene-1.4.3.jar Searcher <index dir> ")
}
def indexDir = new File(args[0]) // Index directory create by Indexer
def q = args[1] // Query string

if (!indexDir.exists() || !indexDir.directory) {
    throw new Exception("$indexDir does not exist or is not a directory")
}

def fsDir = FSDirectory.getDirectory(indexDir, false)
def is = new IndexSearcher(fsDir) // Open index

def query = QueryParser.parse(q, "contents", new StandardAnalyzer()) // Parse query
def start = new Date().time
def hits = is.search(query) // Search index
def end = new Date().time

println "Found ${hits.length()} document(s) (in ${end - start} milliseconds) that matched query '$q':"

for ( i in 0 ..< hits.length() ) {
    println(hits.doc(i)["filename"]) // Retrieve matching document and display filename
}