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Optimized Character Trie Implemented in Java 8
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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.InputStream;
import java.net.URI;
import java.util.*;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

/**
 * The type Misspelling.
 */
public class Misspelling extends TestDocument {

  /**
   * The constant BIRKBECK.
   */
  public static Loader BIRKBECK = new Loader(URI.create(
      "http://www.dcs.bbk.ac.uk/~ROGER/missp.dat"), 10000);

  /**
   * Instantiates a new Misspelling.
   *
   * @param correct     the correct
   * @param misspelling the misspelling
   */
  public Misspelling(String correct, CharSequence misspelling) {
    super(correct, misspelling);
  }

  /**
   * The type Loader.
   */
  public static class Loader {
    private final String url;
    private final String file;
    private final int articleLimit;
    private final List queue = Collections.synchronizedList(new ArrayList<>());
    private volatile Thread thread;

    /**
     * Instantiates a new Loader.
     *
     * @param uri          the uri
     * @param articleLimit the article limit
     */
    public Loader(URI uri, int articleLimit) {
      url = uri.toString();
      this.articleLimit = articleLimit;
      String path = uri.getPath();
      String[] split = path.split("/");
      file = split[split.length - 1];
    }

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

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

    private void read() {
      try {
        try (final InputStream in = Util.cacheLocal(file, new URI(url))) {
          String txt = new String(IOUtils.toByteArray(in), "UTF-8").replaceAll("\r", "");
          CharSequence[] list = txt.split("\n");
          String activeItem = "";
          for (CharSequence item : list) {
            if (item.toString().startsWith("$")) {
              activeItem = item.toString().substring(1);
            } else {
              queue.add(new Misspelling(activeItem, item));
            }
          }

        }
      } catch (final RuntimeException e) {
        if (!(e.getCause() instanceof InterruptedException)) e.printStackTrace();
      } catch (final Exception e) {
        e.printStackTrace();
      } finally {
        System.err.println("Read thread exit");
      }
    }

  }

}