@matfah/

Filter FR 2008

Java

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  • Main.java
  • Filter.java
  • OrFilter.java
  • PartB.java

This Plugin Crashed!

Error: Error: must not create an existing file {"type":"CREATE_FILE","wid":"0.23518567926040967","path":"Main.java","file":{"path":"Main.java","content":{"asEncoding":{"base64":"import java.lang.reflect.*;
import java.util.ArrayList;

public class Main {
  public static void main(String[] args) {
    for(int i = 0; i < 10; i++)
      testOrFilter();
      
    for(int i = 0; i < 10; i++)
      testBuildFilter();
      
    System.out.println("All tests passed!");
  }
  
  public static void checkAllInstanceVariablesArePrivate(Class c) {
    Field[] fields = c.getDeclaredFields();
    for(Field f: fields) {
      if((f.getModifiers() & Modifier.PRIVATE) != Modifier.PRIVATE)
      {
        System.out.println("Not all fields of " + c.getName() + " are private!");
        System.exit(0);
      }
    }
  }
  
  public static void testOrFilter() {
    checkAllInstanceVariablesArePrivate(OrFilter.class);
    
    Constructor<OrFilter> cons = null;
    
    try {
      cons = OrFilter.class.getConstructor(Filter.class, Filter.class);
    }
    catch(Exception e) {
      System.out.println("OrFilter does not have a two parameter Filter constructor");
      System.exit(0);
    }
    
    OrFilter check = null;
    String[] toMatch = {"the", "pizza", "apple", "city"};
    String[] phrases = {"it's the end of the world as we know it", 
                        "did someone say pizza?",
                        "an apple a day keeps the doctor away",
                        "we built this city on rock and roll!"};
    
    int matchPosOne = (int)(Math.random()*toMatch.length);
    int matchPosTwo = (int)(Math.random()*toMatch.length);
    int phrasePos = (int)(Math.random()*phrases.length);

    NotFilter a = null;
    NotFilter b = null;

    try {
      a = new NotFilter(new SimpleFilter(toMatch[matchPosOne]));
      b = new NotFilter(new SimpleFilter(toMatch[matchPosTwo]));
      check = cons.newInstance(a, b);
    }
    catch(Exception e) {
      System.out.println("Error creating an instance of an OrFilter");
      System.exit(0);
    }
    
    
    //now, there isn't a way to see if they've initializes their fields correctly,
    //but let's make sure they initialize at least one of them!
    Field[] fields = OrFilter.class.getDeclaredFields();
    boolean didOne = false;
    for(Field f: fields) {
      f.setAccessible(true);
      Object value = null;

      //I'm not sure how this would generate an error...
      try {
        value = f.get(check);
      }
      catch(Exception e) {}
      
      if(value != null)
        didOne = true;
    }
    
    //this doesn't check if they initialized it correctly... 
    //that's almost impossible to tell...
    if(!didOne) {
      System.out.println("OrFilter constructor does not initialize an instance variable!");
      System.exit(0);
    }
    
    boolean result = false;
    
    try {
      result = check.accept(phrases[phrasePos]);
    }
    catch(Exception e) {
      System.out.println("Error calling accept() method of OrFilter class");
      System.exit(0);
    }
    
    //I do an and because you actually don't need to call both if the result should be false
    if(!a.called && !b.called) {
      System.out.println("OrFilter class does not call accept() method for each of the Filter objects it contains");
      System.exit(0);
    }
    
    if(result != (phrases[phrasePos].indexOf(toMatch[matchPosOne]) < 0 || phrases[phrasePos].indexOf(toMatch[matchPosTwo]) < 0)) {
      System.out.println("Wrong result returned by accept() method of OrFilter class");
      System.exit(0);
    }
    
  }
  
  public static void testBuildFilter() {
    Filter f = null;
    
    String[] random = {"happy", "birthday", "america"};
    String[] good = {"the", "and", "or", "but", "why"};
    String[] bad = {"yolo", "burn"};
    
    ArrayList<String> goodSelect = new ArrayList<String>();
    while(goodSelect.size() < 2) {
      goodSelect = new ArrayList<String>();
      boolean[] goodChoices = {Math.random() < 0.5, 
                               Math.random() < 0.5, 
                               Math.random() < 0.5, 
                               Math.random() < 0.5, 
                               Math.random() < 0.5};
                              
      
      for(int i = 0; i < good.length; i++) {
        if(goodChoices[i])
          goodSelect.add(good[i]);
      }
    }
    
    String[] goodChoice = new String[goodSelect.size()];
    for(int i = 0; i < goodChoice.length; i++) {
      goodChoice[i] = goodSelect.get(i);
    }
    
    int badChoice = (int)(Math.random()*2);
    
    try {
      f = PartB.buildFilter(goodChoice, bad[badChoice]);
    }
    catch(Exception e) {
      System.out.println("Error calling buildFilter() method");
      e.printStackTrace();
      System.exit(0);
    }
    
    for(int i = 0; i < 50; i++) {
      String message = "";
      
      for(int j = 0; j < 7; j++) {
        
        int choice = (int)(Math.random()*10);
        if(choice < 3)
          message += random[choice] + " ";
        else if(choice < 8)
          message += good[choice - 3] + " ";
        else
          message += bad[choice-8] + " ";
      }
    
    
      boolean result = false;
      
      try {
        result = f.accept(message);
      }
      catch(Exception e) {
        System.out.println("Error calling accept() on filter built by buildFilter() method!");
        System.exit(0);
      }
      
      boolean noBad = message.indexOf(bad[badChoice]) < 0;
      boolean hasGood = false;
      for(String g : goodChoice) {
        if(message.indexOf(g) >= 0) {
          hasGood = true;
          break;
        }
      }
      
      if(result != (noBad && hasGood)) {
        System.out.println("Result of calling accept() on filter built by buildFilter() method is incorrect");
        System.exit(0);
      }
    }
    
  }
}

class SimpleFilter implements Filter {
  
  private String sub;
  
  public SimpleFilter(String s) {
    sub = s;
  }
  
  public boolean accept(String text) {
    return text.indexOf(sub) != -1;
  }
}

class AndFilter implements Filter {
  
  private Filter a, b;
  
  public AndFilter(Filter a, Filter b) {
    this.a = a;
    this.b = b;
  }
  
  public boolean accept(String text) {
    return a.accept(text) && b.accept(text);
  }
}

class NotFilter implements Filter {
  private Filter a;
  boolean called;

  public NotFilter(Filter a) {
    this.a = a;
  }
  
  public boolean accept(String text) {
    called = true;
    return !a.accept(text);
  }
}"},"asBuffer":null},"loaded":true}}
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import java.lang.reflect.*;
import java.util.ArrayList;

public class Main {
  public static void main(String[] args) {
    for(int i = 0; i < 10; i++)
      testOrFilter();
      
    for(int i = 0; i < 10; i++)
      testBuildFilter();
      
    System.out.println("All tests passed!");
  }
  
  public static void checkAllInstanceVariablesArePrivate(Class c) {
    Field[] fields = c.getDeclaredFields();
    for(Field f: fields) {
      if((f.getModifiers() & Modifier.PRIVATE) != Modifier.PRIVATE)
      {
        System.out.println("Not all fields of " + c.getName() + " are private!");
        System.exit(0);
      }
    }
  }
  
  public static void testOrFilter() {
    checkAllInstanceVariablesArePrivate(OrFilter.class);
    
    Constructor<OrFilter> cons = null;
    
    try {
      cons = OrFilter.class.getConstructor(Filter.class, Filter.class);
    }
    catch(Exception e) {
      System.out.println("OrFilter does not have a two parameter Filter constructor");
      System.exit(0);
    }
    
    OrFilter check = null;
    String[] toMatch = {"the", "pizza", "apple", "city"};
    String[] phrases = {"it's the end of the world as we know it", 
                        "did someone say pizza?",
                        "an apple a day keeps the doctor away",
                        "we built this city on rock and roll!"};
    
    int matchPosOne = (int)(Math.random()*toMatch.length);
    int matchPosTwo = (int)(Math.random()*toMatch.length);
    int phrasePos = (int)(Math.random()*phrases.length);

    NotFilter a = null;
    NotFilter b = null;

    try {
      a = new NotFilter(new SimpleFilter(toMatch[matchPosOne]));
      b = new NotFilter(new SimpleFilter(toMatch[matchPosTwo]));
      check = cons.newInstance(a, b);
    }
    catch(Exception e) {
      System.out.println("Error creating an instance of an OrFilter");
      System.exit(0);
    }
    
    
    //now, there isn't a way to see if they've initializes their fields correctly,
    //but let's make sure they initialize at least one of them!
    Field[] fields = OrFilter.class.getDeclaredFields();
    boolean didOne = false;
    for(Field f: fields) {
      f.setAccessible(true);
      Object value = null;

      //I'm not sure how this would generate an error...
      try {
        value = f.get(check);
      }
      catch(Exception e) {}
      
      if(value != null)
        didOne = true;
    }
    
    //this doesn't check if they initialized it correctly... 
    //that's almost impossible to tell...
    if(!didOne) {
      System.out.println("OrFilter constructor does not initialize an instance variable!");
      System.exit(0);
    }
    
    boolean result = false;
    
    try {
      result = check.accept(phrases[phrasePos]);
    }
    catch(Exception e) {
      System.out.println("Error calling accept() method of OrFilter class");
      System.exit(0);
    }
    
    //I do an and because you actually don't need to call both if the result should be false
    if(!a.called && !b.called) {
      System.out.println("OrFilter class does not call accept() method for each of the Filter objects it contains");
      System.exit(0);
    }
    
    if(result != (phrases[phrasePos].indexOf(toMatch[matchPosOne]) < 0 || phrases[phrasePos].indexOf(toMatch[matchPosTwo]) < 0)) {
      System.out.println("Wrong result returned by accept() method of OrFilter class");
      System.exit(0);
    }
    
  }
  
  public static void testBuildFilter() {
    Filter f = null;
    
    String[] random = {"happy", "birthday", "america"};
    String[] good = {"the", "and", "or", "but", "why"};
    String[] bad = {"yolo", "burn"};
    
    ArrayList<String> goodSelect = new ArrayList<String>();
    while(goodSelect.size() < 2) {
      goodSelect = new ArrayList<String>();
      boolean[] goodChoices = {Math.random() < 0.5, 
                               Math.random() < 0.5, 
                               Math.random() < 0.5, 
                               Math.random() < 0.5, 
                               Math.random() < 0.5};
                              
      
      for(int i = 0; i < good.length; i++) {
        if(goodChoices[i])
          goodSelect.add(good[i]);
      }
    }
    
    String[] goodChoice = new String[goodSelect.size()];
    for(int i = 0; i < goodChoice.length; i++) {
      goodChoice[i] = goodSelect.get(i);
    }
    
    int badChoice = (int)(Math.random()*2);
    
    try {
      f = PartB.buildFilter(goodChoice, bad[badChoice]);
    }
    catch(Exception e) {
      System.out.println("Error calling buildFilter() method");
      e.printStackTrace();
      System.exit(0);
    }
    
    for(int i = 0; i < 50; i++) {
      String message = "";
      
      for(int j = 0; j < 7; j++) {
        
        int choice = (int)(Math.random()*10);
        if(choice < 3)
          message += random[choice] + " ";
        else if(choice < 8)
          message += good[choice - 3] + " ";
        else
          message += bad[choice-8] + " ";
      }
    
    
      boolean result = false;
      
      try {
        result = f.accept(message);
      }
      catch(Exception e) {
        System.out.println("Error calling accept() on filter built by buildFilter() method!");
        System.exit(0);
      }
      
      boolean noBad = message.indexOf(bad[badChoice]) < 0;
      boolean hasGood = false;
      for(String g : goodChoice) {
        if(message.indexOf(g) >= 0) {
          hasGood = true;
          break;
        }
      }
      
      if(result != (noBad && hasGood)) {
        System.out.println("Result of calling accept() on filter built by buildFilter() method is incorrect");
        System.exit(0);
      }
    }
    
  }
}

class SimpleFilter implements Filter {
  
  private String sub;
  
  public SimpleFilter(String s) {
    sub = s;
  }
  
  public boolean accept(String text) {
    return text.indexOf(sub) != -1;
  }
}

class AndFilter implements Filter {
  
  private Filter a, b;
  
  public AndFilter(Filter a, Filter b) {
    this.a = a;
    this.b = b;
  }
  
  public boolean accept(String text) {
    return a.accept(text) && b.accept(text);
  }
}

class NotFilter implements Filter {
  private Filter a;
  boolean called;

  public NotFilter(Filter a) {
    this.a = a;
  }
  
  public boolean accept(String text) {
    called = true;
    return !a.accept(text);
  }
}