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Java example source code file (FileDocumentIterator.java)

This example Java source code file (FileDocumentIterator.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

error, file, filedocumentiterator, inputstream, ioexception, lineiterator, logger, override, runtimeexception, util

The FileDocumentIterator.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.documentiterator;

import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.LineIterator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Iterate over files
 * @author Adam Gibson
 *
 */
public class FileDocumentIterator implements DocumentIterator {

    private Iterator<File> iter;
    private LineIterator lineIterator;
    private File rootDir;
    private static final Logger log  = LoggerFactory.getLogger(FileDocumentIterator.class);

    public FileDocumentIterator(String path) {
        this(new File(path));
    }


    public FileDocumentIterator(File path) {
        if(path.isFile())  {
            iter = Arrays.asList(path).iterator();
            try {
                lineIterator = FileUtils.lineIterator(path);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            this.rootDir = path;
        }
        else {
            iter = FileUtils.iterateFiles(path, null, true);
            try {
                lineIterator = FileUtils.lineIterator(iter.next());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            this.rootDir = path;
        }


    }

    @Override
    public synchronized  InputStream nextDocument() {
        try {
            if(lineIterator != null && !lineIterator.hasNext() && iter.hasNext()) {
                File next = iter.next();
                lineIterator.close();
                lineIterator = FileUtils.lineIterator(next);
                while(!lineIterator.hasNext()) {
                    lineIterator.close();
                    lineIterator = FileUtils.lineIterator(next);
                }


            }

            if(lineIterator.hasNext())

                return new BufferedInputStream(IOUtils.toInputStream(lineIterator.nextLine()));
        } catch (Exception e) {
           log.warn("Error reading input stream...this is just a warning..Going to return",e);
            return null;
        }

        return null;
    }

    @Override
    public synchronized boolean hasNext() {
        return iter.hasNext() || lineIterator != null && lineIterator.hasNext();
    }

    @Override
    public void reset() {
        if(rootDir.isDirectory())
            iter = FileUtils.iterateFiles(rootDir, null, true);
        else
            iter =  Arrays.asList(rootDir).iterator();

    }

}

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