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Java example source code file (FilenamesLabelAwareIterator.java)

This example Java source code file (FilenamesLabelAwareIterator.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, atomicinteger, bufferedreader, builder, file, filenameslabelawareiterator, filereader, labelleddocument, labelssource, list, nonnull, override, runtimeexception, stringbuilder, util

The FilenamesLabelAwareIterator.java Java example source code

package org.deeplearning4j.text.documentiterator;

import lombok.NonNull;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 *
 * This LabelAwareIterator scans folder for files, and returns them as LabelledDocuments.
 * Each LabelledDocument will set it's Label to file name.
 *
 * @author raver119@gmail.com
 */
public class FilenamesLabelAwareIterator implements LabelAwareIterator {
    protected List<File> files;
    protected AtomicInteger position = new AtomicInteger(0);
    protected LabelsSource labelsSource;
    protected boolean absPath = false;

    /*
        Please keep this method protected, it's used in tests
     */
    protected FilenamesLabelAwareIterator() {

    }

    protected FilenamesLabelAwareIterator(@NonNull List<File> files, @NonNull LabelsSource source) {
        this.files = files;
        this.labelsSource = source;
    }

    @Override
    public boolean hasNextDocument() {
        return position.get() < files.size();
    }


    @Override
    public LabelledDocument nextDocument() {
        File fileToRead = files.get(position.getAndIncrement());
        String label = (absPath) ? fileToRead.getAbsolutePath() : fileToRead.getName();
        labelsSource.storeLabel(label);
        try {
            LabelledDocument document = new LabelledDocument();
            BufferedReader reader = new BufferedReader(new FileReader(fileToRead));
            StringBuilder builder = new StringBuilder();
            String line = "";
            while ((line = reader.readLine()) != null) builder.append(line);

            document.setContent(builder.toString());
            document.setLabel(label);

            try {
                reader.close();
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

            return document;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void reset() {
        position.set(0);
    }

    @Override
    public LabelsSource getLabelsSource() {
        return labelsSource;
    }

    public static class Builder {
        protected List<File> foldersToScan = new ArrayList<>();

        private List<File> fileList = new ArrayList<>();
        private List<String> labels = new ArrayList<>();
        private boolean absPath = false;

        public Builder() {

        }

        /**
         * Root folder for labels -> documents.
         * Each subfolder name will be presented as label, and contents of this folder will be represented as LabelledDocument, with label attached
         *
         * @param folder folder to be scanned for labels and files
         * @return
         */
        public Builder addSourceFolder(@NonNull File folder) {
            foldersToScan.add(folder);
            return this;
        }

        public Builder useAbsolutePathAsLabel(boolean reallyUse) {
            this.absPath = reallyUse;
            return this;
        }

        private void scanFolder(File folderToScan) {
            File[] files = folderToScan.listFiles();
            if (files == null || files.length ==0 ) return;


            for (File fileLabel: files) {
                if (fileLabel.isDirectory()) {
                    scanFolder(fileLabel);
                } else {
                    fileList.add(fileLabel);
                }
            }
        }

        public FilenamesLabelAwareIterator build() {
            // search for all files in all folders provided


            for (File file: foldersToScan) {
                if (!file.isDirectory()) continue;
                scanFolder(file);
            }

            LabelsSource source = new LabelsSource(labels);
            FilenamesLabelAwareIterator iterator = new FilenamesLabelAwareIterator(fileList, source);
            iterator.absPath = this.absPath;

            return iterator;
        }
    }
}

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