// CS 2510 Spring 2011
// Lab 4: Files.java
import tester.*;

// Represents various kinds of files
interface IFile{
  
    // Compute the size of this file in bytes
    int size();
}

// Represents a text file
class TextFile implements IFile{
    String name;
    String owner;
    int length;   // in bytes
  
    TextFile(String name, String owner, int length){
        this.name = name;
        this.owner = owner;
        this.length = length;
    }
  
    // Compute the size of this TextFile, in bytes
    int size(){
        return this.length;
    }  
}

//to represent an image file
class ImageFile implements IFile{
    String name;
    String owner;
    int width;   // in pixels
    int height;  // in pixels
  
    ImageFile(String name, String owner, int width, int height){
        this.name = name;
        this.owner = owner;
        this.width = width;
        this.height = height;
    }
  
    // Compute the size of this ImageFile, in bytes
    int size(){
        return this.width * this.height;
    }  
}


//to represent an audio file
class AudioFile implements IFile{
    String name;
    String owner;
    int speed;   // in bytes per second
    int length;  // in seconds of recording time
    
    AudioFile(String name, String owner, int speed, int length){
        this.name = name;
        this.owner = owner;
        this.speed = speed;
        this.length = length;
    }
  
    // compute the size of this file
    int size(){
        return this.speed * this.length;
    }  
}

// Examples class for Files
class FileExamples{
    FileExamples(){}
  
    IFile text = new TextFile("Files.java", "vkp", 2048);
    IFile img = new ImageFile("photo.jpg", "chadwick", 640, 480);
    IFile aud = new AudioFile("watcha_want.mp3", "shivers", 44, 120000);
  
    // Test the size method
    boolean testSize(Tester t){
        return (t.checkExpect(this.text.size(), 2048) &&
                t.checkExpect(this.img.size(), 307200) &&
                t.checkExpect(this.aud.size(), 5280000));
    }
}