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/*
 * ====================================================================
 * Project:     openmdx, http://www.openmdx.org/
 * Description: XML Encoder 
 * Owner:       OMEX AG, Switzerland, http://www.omex.ch
 * ====================================================================
 *
 * This software is published under the BSD license
 * as listed below.
 * 
 * Copyright (c) 2004-2005, OMEX AG, Switzerland
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 * 
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 * 
 * * Neither the name of the openMDX team nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * ------------------
 * 
 * This product includes software developed by the Apache Software
 * Foundation (http://www.apache.org/).
 */
package org.openmdx.base.text.conversion;

/**
 * XML Encoder
 */
public class XMLEncoder {

    /**
     * Avoid instantiation
     */
    private XMLEncoder() {
        super();
    }

    /**
     * Encode reserved enities
     * 
     * @param s the source string
     * 
     * @return the encoded string
     */
    public static String encode(
        String s
    ) {
        StringBuilder result = null;
        for (int i = 0, max = s.length(), delta = 0; i < max; i++) {
            char c = s.charAt(i);
            String replacement =
                c == '&' ? "&" :
                c == '<' ? "<" :
                c == '\r' ? "" :
                c == '>' ? ">" :
                c == '"' ? """ :
                c == '\'' ?"'" :
                null;
            if (replacement != null) {
                if (result == null) result = new StringBuilder(s);
                result.replace(i + delta, i + delta + 1, replacement);
                delta += (replacement.length() - 1);
            }
        }
        return result == null ? s : result.toString();
    }

}