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This component contains implementation of HTTP 1.1 protocol.

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/*
 * Copyright (c) 2018 Konstantin Plotnikov
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package org.asyncflows.protocol.http.common;

import org.asyncflows.protocol.LineUtil;

/**
 * The XML utils.
 */
public final class XmlUtil {
    /**
     * Private constructor for the utility class.
     */
    private XmlUtil() {
        // do nothing
    }

    /**
     * Escape XML.
     *
     * @param value the value to encode.
     * @return the encoded value
     */
    public static String escapeXml(final String value) {
        if (value == null) {
            return null;
        }
        final StringBuilder rc = new StringBuilder();
        for (int i = 0; i < value.length(); i++) {
            final char c = value.charAt(i);
            switch (c) {
                case '<':
                    rc.append("<");
                    break;
                case '>':
                    rc.append(">");
                    break;
                case '\"':
                    rc.append(""");
                    break;
                case '&':
                    rc.append("&");
                    break;
                case '\'':
                    rc.append("'");
                    break;
                default:
                    if (c == LineUtil.DEL || c < ' ' && !Character.isSpaceChar(c)) {
                        rc.append("&#").append((int) c).append(';');
                    } else {
                        rc.append(c);
                    }
                    break;
            }
        }
        return rc.toString();
    }
}