code: /*
   * Copyright (c) 2017-2018 The Regents of the University of California
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   * 1. Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   * notice, this list of conditions and the following disclaimer in the
   * documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package edu.berkeley.cs.jqf.examples.common;
  
  import java.io.BufferedReader;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.util.ArrayList;
  import java.util.List;
  
  import com.pholser.junit.quickcheck.generator.GenerationStatus;
  import com.pholser.junit.quickcheck.generator.Generator;
  import com.pholser.junit.quickcheck.random.SourceOfRandomness;
  
  public class DictionaryBackedStringGenerator extends Generator<String> {
  
      private final List<String> dictionary;
      private Generator<String> fallback;
  
      public DictionaryBackedStringGenerator(String source, Generator<String> fallback) throws IOException {
          super(String.class);
          this.dictionary = new ArrayList<>();
          this.fallback = fallback;
  
          // Read dictionary words
          try (InputStream in = this.getClass().getClassLoader().getResourceAsStream(source)) {
              if (in == null) {
                  throw new FileNotFoundException("Dictionary file not found: " + source);
              }
  
              BufferedReader br = new BufferedReader(new InputStreamReader(in));
              String item;
              while ((item = br.readLine()) != null) {
                  dictionary.add(item);
              }
          }
      }
  
      @Override
      public String generate(SourceOfRandomness random, GenerationStatus status) {
          if (true) {
              int choice = random.nextInt(dictionary.size());
              return dictionary.get(choice);
          } else {
              if (fallback == null) {
                  fallback = gen().type(String.class);
              }
              return fallback.generate(random, status);
          }
      }
  
  }
  