searchEngine.IndexFiles.java Source code

Introduction

Here is the source code for searchEngine.IndexFiles.java

Source

/*
 * 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.
 */
package searchEngine;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Date;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.cn.smart.SmartChineseAnalyzer;
import org.apache.lucene.document.LongPoint;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.jsoup.Jsoup;

public class IndexFiles {

    private IndexFiles() {
    }

    public static void Do(String[] args) {
        String usage = "java org.apache.lucene.demo.IndexFiles"
                + " [-index INDEX_PATH] [-docs DOCS_PATH] [-update]\n\n"
                + "This indexes the documents in DOCS_PATH, creating a Lucene index"
                + "in INDEX_PATH that can be searched with SearchFiles";
        String indexPath = "index";
        String docsPath = null;
        boolean create = true;
        for (int i = 0; i < args.length; i++) {
            if ("-index".equals(args[i])) {
                indexPath = args[i + 1];
                i++;
            } else if ("-docs".equals(args[i])) {
                docsPath = args[i + 1];
                i++;
            } else if ("-update".equals(args[i])) {
                create = false;
            }
        }

        if (docsPath == null) {
            System.err.println("Usage: " + usage);
            System.exit(1);
        }

        final Path docDir = Paths.get(docsPath);
        if (!Files.isReadable(docDir)) {
            System.out.println("Document directory '" + docDir.toAbsolutePath()
                    + "' does not exist or is not readable, please check the path");
            System.exit(1);
        }

        Date start = new Date();
        try {
            System.out.println("Indexing to directory '" + indexPath + "'...");

            Directory dir = FSDirectory.open(Paths.get(indexPath));
            Analyzer analyzer = new SmartChineseAnalyzer();
            IndexWriterConfig iwc = new IndexWriterConfig(analyzer);

            if (create) {
                iwc.setOpenMode(OpenMode.CREATE);
            } else {
                iwc.setOpenMode(OpenMode.CREATE_OR_APPEND);
            }

            IndexWriter writer = new IndexWriter(dir, iwc);
            indexDocs(writer, docDir);

            writer.close();

            Date end = new Date();
            System.out.println(end.getTime() - start.getTime() + " total milliseconds");

        } catch (IOException e) {
            System.out.println(" caught a " + e.getClass() + "\n with message: " + e.getMessage());
        }
    }

    static void indexDocs(final IndexWriter writer, Path path) throws IOException {
        if (Files.isDirectory(path)) {
            Files.walkFileTree(path, new SimpleFileVisitor<Path>() {
                @Override
                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                    try {
                        indexDoc(writer, file, attrs.lastModifiedTime().toMillis());
                    } catch (IOException ignore) {
                    }
                    return FileVisitResult.CONTINUE;
                }
            });
        } else {
            indexDoc(writer, path, Files.getLastModifiedTime(path).toMillis());
        }
    }

    static void indexDoc(IndexWriter writer, Path file, long lastModified) throws IOException {
        try (InputStream stream = Files.newInputStream(file)) {
            File docDir = new File(file.toString());
            org.jsoup.nodes.Document jsoupDoc = Jsoup.parse(docDir, "UTF8");

            Document doc = new Document();
            Field pathField = new StringField("path", file.toString(), Field.Store.YES);
            doc.add(pathField);
            doc.add(new LongPoint("modified", lastModified));
            doc.add(new TextField("title", jsoupDoc.title(), Field.Store.YES));
            doc.add(new TextField("contents", jsoupDoc.text(), Field.Store.YES));

            if (writer.getConfig().getOpenMode() == OpenMode.CREATE) {
                System.out.println("adding " + file);
                writer.addDocument(doc);
            } else {
                System.out.println("updating " + file);
                writer.updateDocument(new Term("path", file.toString()), doc);
            }
        }
    }
}