first commit

CS1322/p3/FileChanger.java

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+/**
+ *  <PRE>
+ *  FileChanger.java
+ *
+ *  Revisions: 1.0 Oct. 05, 2002
+ *               Created the FileChanger class
+ *			   1.1 Oct. 06, 2002
+ *				 Compiled, Commented
+ *			   2.0 Oct. 06, 2002
+ *				 Deleted all, start from scratch, clean up code
+ *			   2.1 Oct. 06, 2002
+ *				 Completed classes
+ *			   2.2 Oct. 06, 2002
+ *				 Commented
+ *  </PRE>
+ *
+ *	Collaboration Statement:
+ *    I worked on the homework assignment alone, using only             
+ *    course materials.
+ *  
+ *  Created with JCreatorLE, some indents are off when viewed through notepad
+ *    or EMACS
+ *
+ *  @author <A HREF="mailto:gtg184g@mail.gatech.edu">Jose Manuel Caban</A>
+ *  @version Version 2.2, Oct. 06, 2002
+ */
+
+import java.io.*;
+
+public class FileChanger {
+  
+  //variables
+  private String strFileName;
+  
+  //readers and writers
+  FileInputStream 		fis;
+  ObjectInputStream 	ois;
+  
+  FileOutputStream		fos;
+  ObjectOutputStream	oos;
+  
+  public static final boolean bDebug = false; //there's nothing to debug
+  											  //that bDebug can handle
+  
+  ////////////////
+  //Constructors//
+  ////////////////
+  
+  /**
+   *Constructor for FileChanger
+   *@param strFileName the name to be given to the output file
+   */
+  public FileChanger(String strFileName){
+  	this.strFileName = strFileName;
+  }
+  
+  ////////////////////////////
+  //Initializers/Destructors//
+  ////////////////////////////
+  
+  /**
+   *Initialize the reader streams
+   *@return true if successful, false if file not found
+   */
+  public boolean initReader(){
+  	
+  	//init file input stream
+  	try{
+  		fis = new FileInputStream(strFileName);
+  	}
+  	catch(FileNotFoundException fnfe){
+  		return false;
+  	}
+  	
+  	//init obj input stream
+  	try{
+  		ois = new ObjectInputStream(fis);
+  	}
+  	catch(IOException ioe){
+  		return false;
+  	}
+  	return true;	
+  }
+  
+  /**
+   *Initialize the write streams
+   */
+  public void initWriter(){
+  	
+  	//init file output stream
+  	try{
+  		fos = new FileOutputStream(strFileName);
+  	}
+  	catch(FileNotFoundException fnfe){
+  		System.err.println("File not Found! - initWriter()");
+  	}
+  	
+  	//init obj output stream
+  	try{
+  		oos = new ObjectOutputStream(fos);
+  	}
+  	catch(IOException ioe){
+  		System.err.println("IOException - initWriter()");
+  	}  	  	
+  }
+  
+  /**
+   *Close read streams
+   */
+  public void closeRead(){
+  	
+  	try{
+  		fis.close();
+  	}
+  	catch(IOException ioe){
+  		System.err.println("IOException - closeRead()");
+  	}  	
+  }
+  
+  /**
+   *Close write streams
+   */
+  public void closeWrite(){
+  	
+  	try{
+  		oos.flush();
+  	}
+  	catch(IOException ioe){
+  		System.err.println("IOException - flush objstream - closeWrite()");
+  	}
+  	
+  	try{
+  		fos.close();
+  	}
+  	catch(IOException ioe){
+  		System.err.println("IOException - close filestream - closeWrite()");
+  	}
+  }
+  
+  ///////////
+  //Methods//
+  ///////////
+  
+  /**
+   *Retrieve the next object in the file
+   */
+  public Object nextObject(){
+  	try{
+  		return ois.readObject();
+  	}
+  	catch(EOFException eof){
+  		return null;
+  	}
+  	catch(ClassNotFoundException cnfe){
+  		System.err.println("Class not found - nextObject()");
+  		return null;
+  	}
+  	catch(IOException ioe){
+  		System.err.println("IO Exception - nextObject()");
+  		return null;
+  	}
+  	catch(NullPointerException npe){
+  		System.err.println("Null Pointer Exception - nextObject()");
+  		return null;
+  	}
+  		
+  }
+  
+  /**
+   *Write an Object to the file
+   *@param toWrite, the object to be written
+   */
+  public void writeObject(Object toWrite){
+  	try{
+  		oos.writeObject(toWrite);
+  	}
+  	catch(IOException ioe){
+  		System.err.println("IO Exception - writeObject()");
+  	}
+  }
+  
+  /**********************************************************/
+  
+  /**
+   *  Debugging main for class FileChanger.  
+   *  This method will rigorously test my code.
+   *
+   *  <br><br>
+   *  @param args a String array of command line arguments.
+   */
+  public static void main(String[] args) {
+    FileChanger fg = new FileChanger("This stinks.txt");
+    
+    fg.initReader();
+    fg.initWriter();
+    
+    fg.writeObject(new Integer(7));
+    fg.writeObject(new Integer(6));
+    fg.writeObject(new String("Bob is a person too"));
+    fg.writeObject(new Boolean(false));
+    
+    System.out.println(fg.nextObject());
+    System.out.println(fg.nextObject());
+    System.out.println(fg.nextObject());
+    System.out.println(fg.nextObject());
+    System.out.println(fg.nextObject());
+    
+    fg.closeRead();
+    fg.closeWrite();
+    
+    
+  }// end of main(String[] args)
+
+}// end of class FileChanger