code: package cc.mallet.types;
  
  import java.io.*;
  
  public class AlphabetFactory {
  
  	/** Create a dummy alphabet with <code>n</code> dimensions */
  	public static Alphabet alphabetOfSize (int n) {
  		Alphabet alphabet = new Alphabet();
  		for (int i = 0; i < n; i++) {
  			alphabet.lookupIndex("d" + i);
  		}
  		return alphabet;
  	}
  
  	/** Create a dummy label alphabet with <code>n</code> dimensions */
  	public static LabelAlphabet labelAlphabetOfSize (int n) {
  		LabelAlphabet alphabet = new LabelAlphabet();
  		for (int i = 0; i < n; i++) {
  			alphabet.lookupIndex("d" + i);
  		}
  		return alphabet;
  	}
  
  	/** Load an alphabet from a file, one item per line */
  	public static Alphabet loadFromFile(File alphabetFile) throws IOException {
  		BufferedReader reader = new BufferedReader(new FileReader(alphabetFile));
  		Alphabet alphabet = new Alphabet();
  		String item;
  
  		while ((item = reader.readLine()) != null) {
  			alphabet.lookupIndex(item);
  		}
  		
  		reader.close();
  
  		return alphabet;
  	}
  	
  }