Utility.java

package hudson.plugins.mantis;


import java.io.PrintStream;
import java.util.Arrays;

/**
 * Utility class.
 *
 * @author Seiji Sogabe
 */
public final class Utility {

    private static final char[] REGEXP_CHARS = new char[] {
        '\\', '[', ']', '(', ')', '{', '}', '^', '$', '|', '?', '*', '+', '-', ':', ',', '.', '&'
    };

    static {
        Arrays.sort(REGEXP_CHARS);
    }

    private Utility() {
        //
    }

    public static String escape(final String str) {
        if (str == null) {
            return null;
        }

        final int len = str.length();
        final StringBuffer buf = new StringBuffer(len);
        for (int i = 0; i < len; i++) {
            final char c = str.charAt(i);

            switch (c) {
                case '<':
                    buf.append("<");
                    break;
                case '>':
                    buf.append(">");
                    break;
                case '&':
                    if ((i < len - 1) && (str.charAt(i + 1) == '#')) {
                        buf.append(c);
                    } else {
                        buf.append("&");
                    }
                    break;
                case '"':
                    buf.append(""");
                    break;
                case '\'':
                    buf.append("'");
                    break;
                default:
                    buf.append(c);
                    break;
            }
        }

        return buf.toString();
    }

    public static void log(final PrintStream logger, final String message) {
        final StringBuffer buf = new StringBuffer();
        buf.append("[MANTIS] ").append(message);
        logger.println(buf.toString());
    }

    public static String escapeRegexp(final String str) {
        if (str == null) {
            return null;
        }

        final StringBuffer buf = new StringBuffer();
        final int len = str.length();
        for (int i = 0; i < len; i++) {
            final char c = str.charAt(i);
            if (Arrays.binarySearch(REGEXP_CHARS, c) >= 0) {
                buf.append("\\");
            }
            buf.append(c);
        }

        return buf.toString();
    }
}