Program: 39804
Project: 39804
Buggy source:
@Override public double[] getIdentifiers(Random rand){
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.ONERANDOM) {
    return new double[]{rand.nextDouble(),this.getID()};
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.TWORANDOM) {
    return new double[]{rand.nextDouble(),rand.nextDouble(),this.getID()};
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.SWAPPING) {
    double[][] ids=this.swap(this.getID(),this.knownIDs,TTL,rand);
    this.swapped=ids[1];
    return new double[]{ids[0][0],this.getID()};
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.RANDNEIGHBOR) {
    double next=this.knownIDs[rand.nextInt(this.knownIDs.length)] - this.embedding.getEpsilon() * rand.nextDouble();
    if (next < 0) {
      next++;
    }
    if (this.embedding.isCheckold()) {
      boolean found=false;
      for (int i=0; i < knownIDs.length; i++) {
        if (Math.abs(this.embedding.computeDistance(knownIDs[i],this.id)) < this.embedding.getEpsilon()) {
          found=true;
          break;
        }
      }
      if (!found) {
        return new double[]{next};
      }
    }
    return new double[]{next,this.getID()};
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.RANDNEIGHBORMIDDLE) {
    double[] sort=this.knownIDs.clone();
    Arrays.sort(sort);
    int chosen=rand.nextInt(this.knownIDs.length);
    double next=(sort[chosen] + sort[(chosen + 1) % sort.length]) / (double)2 - this.embedding.getEpsilon() * rand.nextDouble();
    if (next < 0) {
      next++;
    }
    if (this.embedding.isCheckold()) {
      boolean found=false;
      for (int i=0; i < knownIDs.length; i++) {
        if (Math.abs(this.embedding.computeDistance((sort[i] + sort[(i + 1) % sort.length]) / (double)2,this.id)) < this.embedding.getEpsilon()) {
          found=true;
          break;
        }
      }
      if (!found) {
        return new double[]{next};
      }
    }
    return new double[]{next,this.getID()};
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.ALLNEIGHBOR) {
    boolean found=true;
    if (this.embedding.isCheckold()) {
      found=false;
      for (int i=0; i < knownIDs.length; i++) {
        if (Math.abs(this.embedding.computeDistance(knownIDs[i],this.id)) < this.embedding.getEpsilon()) {
          found=true;
          break;
        }
      }
    }
    double[] res;
    if (found) {
      res=new double[this.knownIDs.length + 1];
      res[res.length - 1]=this.getID();
    }
 else {
      res=new double[this.knownIDs.length];
    }
    for (int i=0; i < this.knownIDs.length; i++) {
      double next=this.knownIDs[i] - this.embedding.getEpsilon() * rand.nextDouble();
      if (next < 0) {
        next++;
      }
      res[i]=next;
    }
    return res;
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.ALLNEIGHBORMIDDLE) {
    double[] sort=this.knownIDs.clone();
    Arrays.sort(sort);
    boolean found=true;
    if (this.embedding.isCheckold()) {
      found=false;
      for (int i=0; i < knownIDs.length; i++) {
        if (Math.abs(this.embedding.computeDistance((sort[i] + sort[(i + 1) % sort.length]) / (double)2,this.id)) < this.embedding.getEpsilon()) {
          found=true;
          break;
        }
      }
    }
    double[] res;
    if (found) {
      res=new double[this.knownIDs.length + 1];
      res[res.length - 1]=this.getID();
    }
 else {
      res=new double[this.knownIDs.length];
    }
    for (int i=1; i < this.knownIDs.length; i++) {
      res[i]=(sort[i] + sort[i - 1]) / (double)2 - this.embedding.getEpsilon() * rand.nextDouble();
    }
    res[this.knownIDs.length - 1]=(1 + sort[0] + sort[sort.length - 1]) / 2 - this.embedding.getEpsilon() * rand.nextDouble();
    while (res[res.length - 1] > 1) {
      res[res.length - 1]--;
    }
    return res;
  }
  return null;
}

Fixed version (ground truth):
@Override public double[] getIdentifiers(Random rand){
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.ONERANDOM) {
    return new double[]{rand.nextDouble(),this.getID()};
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.TWORANDOM) {
    return new double[]{rand.nextDouble(),rand.nextDouble(),this.getID()};
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.SWAPPING) {
    double[][] ids=this.swap(this.getID(),this.knownIDs,TTL,rand);
    this.partnerID=(int)ids[0][1];
    this.swapped=ids[1];
    return new double[]{ids[0][0],this.getID()};
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.RANDNEIGHBOR) {
    double next=this.knownIDs[rand.nextInt(this.knownIDs.length)] - this.embedding.getEpsilon() * rand.nextDouble();
    if (next < 0) {
      next++;
    }
    if (this.embedding.isCheckold()) {
      boolean found=false;
      for (int i=0; i < knownIDs.length; i++) {
        if (Math.abs(this.embedding.computeDistance(knownIDs[i],this.id)) < this.embedding.getEpsilon()) {
          found=true;
          break;
        }
      }
      if (!found) {
        return new double[]{next};
      }
    }
    return new double[]{next,this.getID()};
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.RANDNEIGHBORMIDDLE) {
    double[] sort=this.knownIDs.clone();
    Arrays.sort(sort);
    int chosen=rand.nextInt(this.knownIDs.length);
    double next=(sort[chosen] + sort[(chosen + 1) % sort.length]) / (double)2 - this.embedding.getEpsilon() * rand.nextDouble();
    if (next < 0) {
      next++;
    }
    if (this.embedding.isCheckold()) {
      boolean found=false;
      for (int i=0; i < knownIDs.length; i++) {
        if (Math.abs(this.embedding.computeDistance((sort[i] + sort[(i + 1) % sort.length]) / (double)2,this.id)) < this.embedding.getEpsilon()) {
          found=true;
          break;
        }
      }
      if (!found) {
        return new double[]{next};
      }
    }
    return new double[]{next,this.getID()};
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.ALLNEIGHBOR) {
    boolean found=true;
    if (this.embedding.isCheckold()) {
      found=false;
      for (int i=0; i < knownIDs.length; i++) {
        if (Math.abs(this.embedding.computeDistance(knownIDs[i],this.id)) < this.embedding.getEpsilon()) {
          found=true;
          break;
        }
      }
    }
    double[] res;
    if (found) {
      res=new double[this.knownIDs.length + 1];
      res[res.length - 1]=this.getID();
    }
 else {
      res=new double[this.knownIDs.length];
    }
    for (int i=0; i < this.knownIDs.length; i++) {
      double next=this.knownIDs[i] - this.embedding.getEpsilon() * rand.nextDouble();
      if (next < 0) {
        next++;
      }
      res[i]=next;
    }
    return res;
  }
  if (this.embedding.getIdMethod() == IQDEmbedding.IdentifierMethod.ALLNEIGHBORMIDDLE) {
    double[] sort=this.knownIDs.clone();
    Arrays.sort(sort);
    boolean found=true;
    if (this.embedding.isCheckold()) {
      found=false;
      for (int i=0; i < knownIDs.length; i++) {
        if (Math.abs(this.embedding.computeDistance((sort[i] + sort[(i + 1) % sort.length]) / (double)2,this.id)) < this.embedding.getEpsilon()) {
          found=true;
          break;
        }
      }
    }
    double[] res;
    if (found) {
      res=new double[this.knownIDs.length + 1];
      res[res.length - 1]=this.getID();
    }
 else {
      res=new double[this.knownIDs.length];
    }
    for (int i=1; i < this.knownIDs.length; i++) {
      res[i]=(sort[i] + sort[i - 1]) / (double)2 - this.embedding.getEpsilon() * rand.nextDouble();
    }
    res[this.knownIDs.length - 1]=(1 + sort[0] + sort[sort.length - 1]) / 2 - this.embedding.getEpsilon() * rand.nextDouble();
    while (res[res.length - 1] > 1) {
      res[res.length - 1]--;
    }
    return res;
  }
  return null;
}