package gma.util;
/**
* <p>Title: </p>
* <p>Description: InputFileHandler is a utility class for reading inputs from file.</p>
* <p>Copyright: Copyright (C) 2004 I. Dan Melamed</p>
* <p>Company: Department of Computer Science, New York University</p>
* @author Luke Shen
*/
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class InputFileHandler {
private BufferedReader reader = null; //buffered reader, reads text from a character input stream
private String nextLine = null; //next read in line
/**
* Constructor.
* @param fileName name of the input file
*/
public InputFileHandler(String fileName) {
try {
reader = new BufferedReader(new FileReader(fileName));
} catch (FileNotFoundException e) {
e.printStackTrace();
close();
System.exit(1);
}
}
/**
* Checks if there are more lines to read from the input file.
* @return true if there are more lines to read from the input file
*/
public boolean hasLine() {
nextLine = null;
try {
nextLine = reader.readLine();
} catch (IOException e) {
e.printStackTrace();
close();
System.exit(1);
}
if (nextLine != null) {
return true;
} else {
return false;
}
}
/**
* Gets the next read in line.
* @return next read in line
*/
public String nextLine() {
return nextLine;
}
/**
* Closes the input file.
*/
public void close() {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* Utility method to read a column of single words.
* @return list of words
*/
public List readWordList() {
List words = new ArrayList();
while (hasLine()) {
String word = nextLine();
words.add(word);
}
close();
return words;
}
}