replaces all occurrences of the CR character with the LF character, except when the CR is immediately followed by a LF (CRLF sequences), in which case the CR is removed. - Java java.lang

Java examples for java.lang:String Replace

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Description

replaces all occurrences of the CR character with the LF character, except when the CR is immediately followed by a LF (CRLF sequences), in which case the CR is removed.

Demo Code

/*//from w  ww.j  a v a  2 s. com
 * JasperReports - Free Java Reporting Library.
 * Copyright (C) 2001 - 2013 Jaspersoft Corporation. All rights reserved.
 * http://www.jaspersoft.com
 *
 * Unless you have purchased a commercial license agreement from Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of JasperReports.
 *
 * JasperReports is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JasperReports 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with JasperReports. If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Contributors:
 * Gaganis Giorgos - gaganis@users.sourceforge.net
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        String text = "java2s.com";
        System.out.println(replaceCRwithLF(text));
    }

    /**
     * This method replaces all occurrences of the CR character with the LF character, 
     * except when the CR is immediately followed by a LF (CRLF sequences), in which case the CR is removed.
     */
    public static String replaceCRwithLF(String text) {
        if (text != null) {
            int length = text.length();
            char[] chars = text.toCharArray();
            int r = 0;
            boolean dirty = false;
            for (int i = 0; i < length; ++i) {
                char ch = chars[i];
                if (ch == '\r') {
                    dirty = true;
                    if (i + 1 < length && chars[i + 1] == '\n') {
                        r++;
                    } else {
                        chars[i - r] = '\n';
                    }
                } else {
                    chars[i - r] = ch;
                }
            }

            return dirty ? new String(chars, 0, length - r) : text;
        }
        return null;
    }
}

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