// purpose: provides simpler file (local/web) manipulation

import java.util.*;
import java.io.*;
import java.net.*;

public class Connection {

	String pathName;

	// Connection(): creates a connection associated with the file named by name
	// in the folder named by folder
	public Connection( String folder, String name ) {
		// the complete path name is the concatenation of the folder & name
		this.pathName = folder + name;
	}

	// getName(): returns the path name for the connection
	public String getName() {
		return this.pathName;
	}

	// toString(): returns a string representation of the path name
	public String toString() {
		String s = this.getName();

		return s;
	}

	// getScanner(): returns a new Scanner for reading from the file
	public Scanner getScanner() {
		// get the name of the file
		String s = this.getName();

		// get a new stream -- need to take into account that the file is
		// either local or on the web
		Scanner stream;

		try {
			if ( s.indexOf( "http" ) == 0 ) {
				// its a web file to be read
				URL u = new URL( s );
					stream = new Scanner( u.openStream() );
			}
			else {
				// its a local file to be read
				File f = new File( s );
				if ( f.exists() ) {
					stream = new Scanner( f );
				}
				else {
					stream = null;
				}
			}
		}
		catch ( Exception e ) {
			stream = null;
		}

		// hand over the new scanner
		return stream;
	}

	public PrintStream getWriter() {
		// get the name of the file
		String s = this.getName();

		try {
			// get a File representation of the file
			File f   = new File( s );
	
			// get a writer object that displays to the file
			PrintStream writer = new PrintStream( s );
	
			// hand over the print stream
			return writer;
		}
		catch ( Exception e ) {
			return null;
		}
	}

	public void delete() {
		// get the name of the file
		String s = this.getName();

		// get a File representation of the file
		File   f = new File( s );

		// throw the file away
		f.delete();
	}

	// main(): simpler tester of some connection capabilities
	public static void main( String[] args ) throws IOException {
		Connection c = new Connection( "", "junk.txt" );

		PrintStream out = c.getWriter(); 
		
		out.println( "testing 1 2 3" );
		out.println( "1 2 3 testing" );

		Scanner in = c.getScanner();

		while ( in.hasNext() ) {
			System.out.println( in.next() ) ;
		}

		c.delete();
	}
}