LineCompare.java

/*-
 * Copyright (C) 2007 Erik Larsson
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.catacombae.hfsexplorer.testcode;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * Application that compares two text files for equality, after removing empty empty lines, and ignoring
 * different line endings.
 */
public class LineCompare {
    public static void main(String[] args) throws IOException {
	BufferedReader file1 = new BufferedReader(new InputStreamReader(new FileInputStream(args[0])));
	BufferedReader file2 = new BufferedReader(new InputStreamReader(new FileInputStream(args[1])));
	long lineNumber = 0;
	String line1 = "", line2 = "";
	while(!(line1 == null && line2 == null)) {
	    if(line1 == null) {
		System.out.println("File 1 ended at line " + lineNumber + ". Files are not equal.");
		System.exit(1);
	    }
	    else if(line2 == null) {
		System.out.println("File 2 ended at line " + lineNumber + ". Files are not equal.");
		System.exit(1);
	    }
	    else if(!line1.equals(line2)) {
		System.out.println("Files differ at line " + lineNumber + ":");
		System.out.println("File 1:");
		System.out.println(line1);
		System.out.println("File 2:");
		System.out.println(line2);
		System.exit(1);
	    }

	    ++lineNumber;
	    line1 = "";
	    while(line1 != null && line1.trim().equals(""))
		line1 = file1.readLine();
	    line2 = "";
	    while(line2 != null && line2.trim().equals(""))
		line2 = file2.readLine();
	}
	System.out.println("Files are equal (ignoring empty lines and different line endings).");
    }
}