src/utils/IdealGraphVisualizer/Util/src/com/sun/hotspot/igv/util/StringUtils.java

/*
 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.sun.hotspot.igv.util;

/**
 *
 * @author tkrodrig
 */
public class StringUtils {

    public static String escapeHTML(String s) {
        StringBuilder str = null;
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            switch (c) {
                case '&':
                case '<':
                case '>':
                case '"':
                case '\'':
                    if (str == null) {
                        str = new StringBuilder();
                        str.append(s, 0, i);
                    }
                    switch (c) {
                        case '&':
                            str.append("&amp;");
                            break;
                        case '<':
                            str.append("&lt;");
                            break;
                        case '>':
                            str.append("&gt;");
                            break;
                        case '"':
                            str.append("&quot;");
                            break;
                        case '\'':
                            str.append("&apos;");
                            break;
                        default:
                            assert false;
                    }
                    break;
                case '\u0000':
                case '\u0001':
                case '\u0002':
                case '\u0003':
                case '\u0004':
                case '\u0005':
                case '\u0006':
                case '\u0007':
                case '\u0008':
                case '\u000b':
                case '\u000c':
                case '\u000e':
                case '\u000f':
                case '\u0010':
                case '\u0011':
                case '\u0012':
                case '\u0013':
                case '\u0014':
                case '\u0015':
                case '\u0016':
                case '\u0017':
                case '\u0018':
                case '\u0019':
                case '\u001a':
                case '\u001b':
                case '\u001c':
                case '\u001d':
                case '\u001e':
                case '\u001f':
                    if (str == null) {
                        str = new StringBuilder();
                        str.append(s, 0, i);
                    }
                    str.append("'0x").append(Integer.toHexString(c));
                    break;
                default:
                    if (str != null) {
                        str.append(c);
                    }
                    break;
            }
        }
        if (str == null) {
            return s;
        } else {
            return str.toString();
        }
    }

}