com.simiacryptus.util.test.EnglishWords.java Source code

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Here is the source code for com.simiacryptus.util.test.EnglishWords.java

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/*
 * Copyright (c) 2018 by Andrew Charneski.
 *
 * The author 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.simiacryptus.util.test;

import com.simiacryptus.util.Util;
import com.simiacryptus.util.io.AsyncListIterator;
import org.apache.commons.compress.utils.IOUtils;

import java.io.IOException;
import java.io.InputStream;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

/**
 * The type English words.
 */
public class EnglishWords extends TestDocument {
    private static final ArrayList<EnglishWords> queue = new ArrayList<>();
    /**
     * The constant url.
     */
    public static String url = "https://raw.githubusercontent.com/first20hours/google-10000-english/master/20k.txt";
    /**
     * The constant file.
     */
    public static String file = "20k.txt";
    private static volatile Thread thread;

    /**
     * Instantiates a new English words.
     *
     * @param text the text
     */
    public EnglishWords(String text) {
        super(text, text);
    }

    /**
     * Clear.
     *
     * @throws InterruptedException the interrupted exception
     */
    public static void clear() throws InterruptedException {
        if (thread != null) {
            synchronized (WikiArticle.class) {
                if (thread != null) {
                    thread.interrupt();
                    thread.join();
                    thread = null;
                    queue.clear();
                }
            }
        }
    }

    /**
     * Load stream.
     *
     * @return the stream
     */
    public static Stream<EnglishWords> load() {
        if (thread == null) {
            synchronized (WikiArticle.class) {
                if (thread == null) {
                    thread = new Thread(EnglishWords::read);
                    thread.setDaemon(true);
                    thread.start();
                }
            }
        }
        Iterator<EnglishWords> iterator = new AsyncListIterator<>(queue, thread);
        return StreamSupport.stream(Spliterators.spliteratorUnknownSize(iterator, Spliterator.DISTINCT), false)
                .filter(x -> x != null);
    }

    private static void read() {
        try {
            InputStream in = Util.cache(url, file);
            String txt = new String(IOUtils.toByteArray(in), "UTF-8").replaceAll("\r", "");
            List<String> list = Arrays.stream(txt.split("\n")).map(x -> x.replaceAll("[^\\w]", ""))
                    .collect(Collectors.toList());
            Collections.shuffle(list);
            for (String paragraph : list) {
                queue.add(new EnglishWords(paragraph));
            }
        } catch (final IOException e) {
            // Ignore... end of stream
        } catch (final RuntimeException e) {
            if (!(e.getCause() instanceof InterruptedException))
                throw e;
        } catch (final Exception e) {
            throw new RuntimeException(e);
        }
    }
}