Fast lower case conversion : String format « Data Type « Java

Fast lower case conversion

// Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.

/** Fast String Utilities.
 * These string utilities provide both conveniance methods and
 * performance improvements over most standard library versions. The
 * main aim of the optimizations is to avoid object creation unless
 * absolutely required.
 * @author Greg Wilkins (gregw)
class StringUtil
    public static final String CRLF="\015\012";
    public static final String __LINE_SEPARATOR=
    public static String __ISO_8859_1;
        String iso=System.getProperty("ISO_8859_1");
        if (iso!=null)
                new String(new byte[]{(byte)20},"ISO-8859-1");
            catch( e)
    public final static String __UTF8="UTF-8";
    private static char[] lowercases = {
          '\170','\171','\172','\173','\174','\175','\176','\177' };

    /* ------------------------------------------------------------ */
     * fast lower case conversion. Only works on ascii (not unicode)
     * @param s the string to convert
     * @return a lower case version of s
    public static String asciiToLowerCase(String s)
        char[] c = null;
        int i=s.length();

        // look for first conversion
        while (i-->0)
            char c1=s.charAt(i);
            if (c1<=127)
                char c2=lowercases[c1];
                if (c1!=c2)

        while (i-->0)
                c[i] = lowercases[c[i]];
        return c==null?s:new String(c);



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