/*
 * Copyright (c) 2001 Matthew Feldt. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided the copyright notice above is
 * retained.
 *
 * THIS SOFTWARE IS PROVIDED ''AS IS'' AND WITHOUT ANY EXPRESSED OR
 * IMPLIED WARRANTIES.
 */

/**
 * WordCount.java
 *
 * Java Examples In A Nutshell Copyright (c) 2000 David Flanagan
 * Exercise 3-3:
 * Write a program that counts and reports the number of lines, words and
 * characters in a specified file. Use static methods of the java.lang.Character
 * class to determine whether a given character is a space (and therefore the
 * boundry between two words).
 *
 * @author Matthew Feldt <developer@feldt.com>
 * @version 1.0, 01/30/2001 9:29
 */


package com.feldt.examples.io;
import java.io.*;


public class WordCount {
	private static int lineCount, wordCount, charCount;

	/** Sole WordCount constructor. */
	WordCount(File f) throws IOException, IllegalArgumentException {
		count(f);
	}

	/**
	 * Static method to count the number of lines, words and characters in a
	 * file.
	 */
	public static String count(File f) throws IOException, IllegalArgumentException {
		lineCount = wordCount = charCount = 0;
		boolean inWhiteSpace = true;
		int ch;
		BufferedReader in;

		// confirm file is readable, regular and exists
		if (! f.exists())
			throw new IllegalArgumentException(f.getName() +
				": no such file or directory.");
		if (! f.canRead())
			throw new IllegalArgumentException(f.getName() +
				": read protected.");
		if (! f.isFile())
			throw new IllegalArgumentException(f.getName() +
				": not a regular file.");

		in = new BufferedReader(new FileReader(f));

		while ((ch = in.read()) != -1) {
			charCount++; // increment charCount for every character

			if (Character.isWhitespace((char)ch)) {
				inWhiteSpace = true;
				// increment lineCount if ch is newline
				if (ch == '\n') lineCount++;
			} else if (inWhiteSpace) {
				// mark words through state changes in inWhiteSpace
				wordCount++;
				inWhiteSpace = false;
			}
		}

		return f.getName() + ": " + lineCount + " lines, " + wordCount +
			" words, " + charCount + " characters.";
	}

	public int getLineCount() { return lineCount; }
	public int getWordCount() { return wordCount; }
	public int getCharCount() { return charCount; }


	/** test class */
	static class Test {
		public static void main (String args[]) {
			for (int i = 0; i < args.length; i++) {
				try { // call WordCount.count() for each file on the command line
					System.out.println(WordCount.count(new File(args[i])));

					/* could also have done the following
					WordCount wc = new WordCount(new File(args[i]));
					System.out.println(args[i] + ": " + wc.getLineCount() +
						" lines, " + wc.getWordCount() + " words, " +
						wc.getCharCount() + " characters.");
					*/
				} catch(IOException e) {
					System.err.println(e.getMessage());
				} catch(IllegalArgumentException e) {
					System.err.println(e.getMessage());
				}
			}
		}
	}
}