HTMLEscape.java

/*
Copyright 2008-2010 Gephi
Authors : Eduardo Ramos <eduramiba@gmail.com>
Website : http://www.gephi.org

This file is part of Gephi.

DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

Copyright 2011 Gephi Consortium. All rights reserved.

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"License"). You may not use this file except in compliance with the
License. You can obtain a copy of the License at
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or /cddl-1.0.txt and /gpl-3.0.txt. See the License for the
specific language governing permissions and limitations under the
License.  When distributing the software, include this License Header
Notice in each file and include the License files at
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 */
package org.gephi.utils;

/**
 * Class for escaping html of a String to show it in a hrml report without problems
 * @author Eduardo Ramos <eduramiba@gmail.com>
 */
public class HTMLEscape {

    /**Code previously used in web applications, adapted from a google search**/

    /**
     * Escape html from a string to make it safe to show.
     * @param string String to escape html
     * @return Result string
     */
    public static String stringToHTMLString(String string) {
        StringBuilder sb = new StringBuilder(string.length());
        // true if last char was blank
        boolean lastWasBlankChar = false;
        int len = string.length();
        char c;

        for (int i = 0; i < len; i++) {
            c = string.charAt(i);
            if (c == ' ') {
                // blank gets extra work,
                // this solves the problem you get if you replace all
                // blanks with  , if you do that you loss
                // word breaking
                if (lastWasBlankChar) {
                    lastWasBlankChar = false;
                    sb.append(" ");
                } else {
                    lastWasBlankChar = true;
                    sb.append(' ');
                }
            } else {
                lastWasBlankChar = false;
                //
                // HTML Special Chars
                if (c == '"') {
                    sb.append(""");
                } else if (c == '&') {
                    sb.append("&");
                } else if (c == '<') {
                    sb.append("<");
                } else if (c == '>') {
                    sb.append(">");

                } else if (c == '\n') {
                    sb.append("<br>\n");
                } else if (c == '\r') {
                } else {
                    int ci = 0xffff & c;
                    if (ci < 160) {
                        // nothing special only 7 Bit
                        sb.append(c);
                    } else {
                        // Not 7 Bit use the unicode system
                        sb.append("&#");
                        sb.append(new Integer(ci).toString());
                        sb.append(';');
                    }
                }
            }
        }
        return sb.toString();
    }
}