com.icdd.lucene.CreateIndex.java Source code

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Here is the source code for com.icdd.lucene.CreateIndex.java

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/*
 * 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 com.icdd.lucene;

import java.io.BufferedReader;
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.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.SortedNumericDocValuesField;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

public class CreateIndex extends IndexLucene {
    private static IndexWriter writer = null;
    private static final int offset = 0; //50000
    private static final int endset = 50000;
    private static int num = 0;

    /*
     * mode?trueOpenMode.CREATE;  false:OpenMode.CREATE_OR_APPEND.
     */
    public CreateIndex(boolean mode) {
        boolean create = mode;
        try {
            Directory dir = FSDirectory.open(Paths.get(INDEX_PATH));
            IndexWriterConfig iwc = new IndexWriterConfig(ANALYZER);
            if (create)
                iwc.setOpenMode(OpenMode.CREATE);
            else {
                iwc.setOpenMode(OpenMode.CREATE_OR_APPEND);
            }
            writer = new IndexWriter(dir, iwc);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    /**
     * create or update index files
     */
    public void createOrUpdateIndex(String docsPath) {
        Path docDir = Paths.get(docsPath);
        if (!Files.isReadable(docDir)) {
            logger.warn("Document directory '" + docDir + "'does not exist or  is not readable, "
                    + "please check the path");
        }
        Date start = new Date();
        try {
            logger.warn("Indexing to directory '" + INDEX_PATH + "'...");

            indexDocs(writer, docDir);

            Date end = new Date();
            logger.info(end.getTime() - start.getTime() + " total milliseconds");
            writer.close();
        } catch (IOException e) {
            logger.info(" 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 attr) throws IOException {
                    try {
                        indexDoc(writer, file, attr.lastModifiedTime().toMillis());
                    } catch (IOException ignore) {
                        logger.info(ignore.getMessage());
                    }
                    return FileVisitResult.CONTINUE;
                }
            });

        } else {

            indexDoc(writer, path, Files.getLastModifiedTime(path).toMillis());
        }
    }

    static void indexDoc(IndexWriter writer, Path file, long lastModified) throws IOException {
        // filter non-xml files
        if (filter.accept(file.toFile())) {

            System.out.println("num: " + num);
            num++;
            if (num < endset && num >= offset) {

                try (InputStream stream = Files.newInputStream(file)) {
                    // make a new,empty document
                    Document doc = new Document();

                    Field pathField = new StringField("path", file.toString(), Field.Store.YES);
                    String filename = file.getFileName().toString();
                    int post = filename.indexOf('_');
                    if (post > 0) {
                        filename = filename.substring(post + 1, filename.length() - 4);
                    }

                    doc.add(pathField);
                    doc.add(new StringField("title", filename, Field.Store.YES));
                    doc.add(new SortedNumericDocValuesField("modified", lastModified));
                    doc.add(new TextField("contents",
                            new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8))));

                    if (writer.getConfig().getOpenMode() == OpenMode.CREATE) {
                        // New index, so we just add the document (no old
                        // document
                        // can
                        // be there):
                        logger.info("adding " + file);
                        writer.addDocument(doc);
                    } else {
                        // Existing index (an old copy of this document may have
                        // been
                        // indexed) so
                        // path, if present:
                        logger.info("updating " + file);
                        writer.updateDocument(new Term("path", file.toString()), doc);
                    }
                }
            }
        }
    }
}