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Java example source code file (LuceneSentenceIterator.java)

This example Java source code file (LuceneSentenceIterator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, bits, directory, document, indexreader, ioexception, list, lucenesentenceiterator, override, sentencepreprocessor, string, util, word_field

The LuceneSentenceIterator.java Java example source code

/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    Licensed 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 org.deeplearning4j.text.sentenceiterator;

import org.apache.commons.compress.utils.IOUtils;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.MultiFields;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.Bits;
import org.deeplearning4j.berkeley.StringUtils;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * Lucene sentence iterator.
 * Read a sentence index
 * and produce sentences.
 *
 * @author Adam Gibson
 */
public class LuceneSentenceIterator implements SentenceIterator {

    private Directory dir;
    private transient IndexReader reader;
    public final static String WORD_FIELD = "word";
    private int index = 0;
    private SentencePreProcessor preProcessor;
    private List<Integer> docs;

    public LuceneSentenceIterator(Directory dir) {
        try {
            this.dir = dir;
            reader = DirectoryReader.open(dir);
            docs = allDocs();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public String nextSentence() {
        Document doc = null;
        try {
            doc = reader.document(docs.get(index));
            index++;
        } catch (IOException e) {
            e.printStackTrace();
        }

        String[] values = doc.getValues(WORD_FIELD);
        return StringUtils.join(values," ");
    }

    @Override
    public boolean hasNext() {
        return index < docs.size();
    }

    @Override
    public void reset() {
        index = 0;
    }

    @Override
    public void finish() {
        IOUtils.closeQuietly(reader);
    }

    @Override
    public SentencePreProcessor getPreProcessor() {
        return preProcessor;
    }

    @Override
    public void setPreProcessor(SentencePreProcessor preProcessor) {
        this.preProcessor = preProcessor;
    }


    private List<Integer> allDocs() {
        List<Integer> docIds = new ArrayList<>();
        Bits liveDocs = MultiFields.getLiveDocs(reader);
        for(int i = 0; i < reader.maxDoc() + 1; i++) {
            if (liveDocs != null && !liveDocs.get(i))
                continue;

            docIds.add(i);
        }
        return docIds;
    }


}

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