org.verwandlung.voj.judger.core.Comparator.java Source code

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Here is the source code for org.verwandlung.voj.judger.core.Comparator.java

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/* Verwandlung Online Judge - A cross-platform judge online system
 * Copyright (C) 2018 Haozhe Xie <cshzxie@gmail.com>
 *
 * 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/>.
 *
 *
 *                              _ooOoo_  
 *                             o8888888o  
 *                             88" . "88  
 *                             (| -_- |)  
 *                             O\  =  /O  
 *                          ____/`---'\____  
 *                        .'  \\|     |//  `.  
 *                       /  \\|||  :  |||//  \  
 *                      /  _||||| -:- |||||-  \  
 *                      |   | \\\  -  /// |   |  
 *                      | \_|  ''\---/''  |   |  
 *                      \  .-\__  `-`  ___/-. /  
 *                    ___`. .'  /--.--\  `. . __  
 *                 ."" '<  `.___\_<|>_/___.'  >'"".  
 *                | | :  `- \`.;`\ _ /`;.`/ - ` : | |  
 *                \  \ `-.   \_ __\ /__ _/   .-` /  /  
 *           ======`-.____`-.___\_____/___.-`____.-'======  
 *                              `=---=' 
 *
 *                          HERE BE BUDDHA
 *
 */
package org.verwandlung.voj.judger.core;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.LineIterator;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.stereotype.Component;

import java.io.File;
import java.io.IOException;

/**
 * .
 * 
 * @author Haozhe Xie
 */
@Component
public class Comparator {
    /**
     * ?.
     * @param standardOutputFilePath - 
     * @param outputFilePath - 
     * @return ??
     */
    public boolean isOutputTheSame(String standardOutputFilePath, String outputFilePath) throws IOException {
        File stdFile = new File(standardOutputFilePath);
        File file = new File(outputFilePath);

        LineIterator stdFileItr = FileUtils.lineIterator(stdFile, "UTF-8");
        LineIterator fileItr = FileUtils.lineIterator(file, "UTF-8");
        boolean isFileOutputTheSame = isFileOutputTheSame(stdFileItr, fileItr);

        LineIterator.closeQuietly(stdFileItr);
        LineIterator.closeQuietly(fileItr);
        return isFileOutputTheSame;
    }

    /**
     * ??.
     * @param stdFileItr - 
     * @param fileItr - 
     * @return ??
     */
    private boolean isFileOutputTheSame(LineIterator stdFileItr, LineIterator fileItr) {
        try {
            while (stdFileItr.hasNext() && fileItr.hasNext()) {
                String stdLine = stdFileItr.nextLine();
                String line = fileItr.nextLine();

                if (!isLineOutputTheSame(stdLine, line)) {
                    return false;
                }
            }
            while (stdFileItr.hasNext()) {
                String line = stdFileItr.nextLine();
                if (!isLineEmpty(line, 0)) {
                    return false;
                }
            }
            while (fileItr.hasNext()) {
                String line = fileItr.nextLine();
                if (!isLineEmpty(line, 0)) {
                    return false;
                }
            }
        } catch (OutOfMemoryError ex) {
            LOGGER.catching(ex);
            return false;
        }
        return true;
    }

    /**
     * ?().
     * @param stdLine - ?
     * @param line - ?
     * @return ???
     */
    private boolean isLineOutputTheSame(String stdLine, String line) {
        int i = 0, j = 0;
        for (; i < stdLine.length() && j < line.length(); ++i, ++j) {
            if (stdLine.charAt(i) != line.charAt(j)) {
                if (stdLine.charAt(i) == '\n') {
                    if (!isLineEmpty(line, j)) {
                        return false;
                    }
                    return true;
                } else if (line.charAt(j) == '\n') {
                    if (!isLineEmpty(stdLine, i)) {
                        return false;
                    }
                    return true;
                }
                return false;
            }
        }
        while (i < stdLine.length()) {
            if (!isLineEmpty(stdLine, i)) {
                return false;
            }
            ++i;
        }
        while (j < line.length()) {
            if (!isLineEmpty(line, j)) {
                return false;
            }
            ++j;
        }
        return true;
    }

    /**
     * .
     * @param line - ?
     * @param startIndex - ?
     * @return ????
     */
    private boolean isLineEmpty(String line, int startIndex) {
        for (int i = startIndex; i < line.length(); ++i) {
            if (!(line.charAt(i) == ' ' || line.charAt(i) == '\n')) {
                return false;
            }
        }
        return true;
    }

    /**
     * .
     */
    private static final Logger LOGGER = LogManager.getLogger(Comparator.class);
}