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package org.apache.lucene.demo;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.io.BufferedReader;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.util.Date;
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import org.apache.lucene.analysis.Analyzer;
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import org.apache.lucene.analysis.standard.StandardAnalyzer;
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import org.apache.lucene.document.Document;
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import org.apache.lucene.index.IndexReader;
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import org.apache.lucene.queryParser.QueryParser;
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import org.apache.lucene.search.IndexSearcher;
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import org.apache.lucene.search.Query;
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import org.apache.lucene.search.ScoreDoc;
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import org.apache.lucene.search.TopDocs;
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import org.apache.lucene.store.FSDirectory;
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import org.apache.lucene.util.Version;
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/** Simple command-line based search demo. */
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public class SearchFiles {
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private SearchFiles() {}
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/** Simple command-line based search demo. */
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public static void main(String[] args) throws Exception {
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"Usage:\tjava org.apache.lucene.demo.SearchFiles [-index dir] [-field f] [-repeat n] [-queries file] [-query string] [-raw] [-paging hitsPerPage]\n\nSee http://lucene.apache.org/java/4_0/demo.html for details.";
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if (args.length > 0 && ("-h".equals(args[0]) || "-help".equals(args[0]))) {
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System.out.println(usage);
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String index = "index";
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String field = "contents";
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String queries = null;
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String queryString = null;
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for(int i = 0;i < args.length;i++) {
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if ("-index".equals(args[i])) {
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} else if ("-field".equals(args[i])) {
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} else if ("-queries".equals(args[i])) {
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} else if ("-query".equals(args[i])) {
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queryString = args[i+1];
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} else if ("-repeat".equals(args[i])) {
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repeat = Integer.parseInt(args[i+1]);
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} else if ("-raw".equals(args[i])) {
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} else if ("-paging".equals(args[i])) {
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hitsPerPage = Integer.parseInt(args[i+1]);
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if (hitsPerPage <= 0) {
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System.err.println("There must be at least 1 hit per page.");
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IndexReader reader = IndexReader.open(FSDirectory.open(new File(index)));
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IndexSearcher searcher = new IndexSearcher(reader);
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Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_31);
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BufferedReader in = null;
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if (queries != null) {
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in = new BufferedReader(new InputStreamReader(new FileInputStream(queries), "UTF-8"));
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in = new BufferedReader(new InputStreamReader(System.in, "UTF-8"));
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QueryParser parser = new QueryParser(Version.LUCENE_31, field, analyzer);
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if (queries == null && queryString == null) { // prompt the user
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System.out.println("Enter query: ");
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String line = queryString != null ? queryString : in.readLine();
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if (line == null || line.length() == -1) {
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if (line.length() == 0) {
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Query query = parser.parse(line);
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System.out.println("Searching for: " + query.toString(field));
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if (repeat > 0) { // repeat & time as benchmark
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Date start = new Date();
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for (int i = 0; i < repeat; i++) {
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searcher.search(query, null, 100);
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Date end = new Date();
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System.out.println("Time: "+(end.getTime()-start.getTime())+"ms");
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doPagingSearch(in, searcher, query, hitsPerPage, raw, queries == null && queryString == null);
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if (queryString != null) {
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* This demonstrates a typical paging search scenario, where the search engine presents
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* pages of size n to the user. The user can then go to the next page if interested in
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* When the query is executed for the first time, then only enough results are collected
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* to fill 5 result pages. If the user wants to page beyond this limit, then the query
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* is executed another time and all hits are collected.
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public static void doPagingSearch(BufferedReader in, IndexSearcher searcher, Query query,
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int hitsPerPage, boolean raw, boolean interactive) throws IOException {
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// Collect enough docs to show 5 pages
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TopDocs results = searcher.search(query, 5 * hitsPerPage);
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ScoreDoc[] hits = results.scoreDocs;
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int numTotalHits = results.totalHits;
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System.out.println(numTotalHits + " total matching documents");
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int end = Math.min(numTotalHits, hitsPerPage);
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if (end > hits.length) {
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System.out.println("Only results 1 - " + hits.length +" of " + numTotalHits + " total matching documents collected.");
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System.out.println("Collect more (y/n) ?");
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String line = in.readLine();
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if (line.length() == 0 || line.charAt(0) == 'n') {
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hits = searcher.search(query, numTotalHits).scoreDocs;
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end = Math.min(hits.length, start + hitsPerPage);
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for (int i = start; i < end; i++) {
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if (raw) { // output raw format
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System.out.println("doc="+hits[i].doc+" score="+hits[i].score);
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Document doc = searcher.doc(hits[i].doc);
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String path = doc.get("path");
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System.out.println((i+1) + ". " + path);
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String title = doc.get("title");
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System.out.println(" Title: " + doc.get("title"));
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System.out.println((i+1) + ". " + "No path for this document");
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if (!interactive || end == 0) {
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if (numTotalHits >= end) {
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boolean quit = false;
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System.out.print("Press ");
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if (start - hitsPerPage >= 0) {
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System.out.print("(p)revious page, ");
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if (start + hitsPerPage < numTotalHits) {
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System.out.print("(n)ext page, ");
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System.out.println("(q)uit or enter number to jump to a page.");
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String line = in.readLine();
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if (line.length() == 0 || line.charAt(0)=='q') {
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if (line.charAt(0) == 'p') {
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start = Math.max(0, start - hitsPerPage);
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} else if (line.charAt(0) == 'n') {
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if (start + hitsPerPage < numTotalHits) {
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int page = Integer.parseInt(line);
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if ((page - 1) * hitsPerPage < numTotalHits) {
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start = (page - 1) * hitsPerPage;
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System.out.println("No such page");
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end = Math.min(numTotalHits, start + hitsPerPage);