import java.util.ArrayList;
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;

/**
 * This class will translate words and phrases from one language to 
 * another (e.g., English to Pirate).
 * 
 * @author Dave Reed 
 * @version 2/9/05
 */
public class Translator
{
	private ArrayList<String> fromLanguage;  // words in the original language
	private ArrayList<String> toLanguage;    // corresponding words in other language

	/**
	 * Constructs a translator with vocabulary read in from a file.
	 *   @param  filename the file that contains vocabulary words, one per line
	 */
	public Translator(String filename)
	{
	    fromLanguage = new ArrayList<String>();
	    toLanguage = new ArrayList<String>();
	    
	    try {
	        Scanner infile = new Scanner(new File(filename));
	        while (infile.hasNextLine()) {
	            String line = infile.nextLine();
	            int divider = line.indexOf("|");
	            fromLanguage.add(line.substring(0, divider));
	            toLanguage.add(line.substring(divider+1, line.length()));
	           }
	    }
	    catch (FileNotFoundException exception) {
	        System.out.println("NO SUCH FILE FOUND");
	    }
	}
	
	/**
	 * Translates a word or phrase, replacing words from one language (fromLanguage)
	 * to another (toLanguage).
	 *   @param str the word or phrase to be translated
	 *   @returns a copy of str with words translated
	 */
	public String translate(String str)
	{
		for (int i = 0; i < fromLanguage.size(); i++) {
		    str = str.replaceAll("\\b"+fromLanguage.get(i)+"\\b", toLanguage.get(i));
		}
		return str;
	}
}