// ========================================================================
// $Id: StringUtil.java,v 1.16 2006/11/23 08:56:53 gregwilkins Exp $
// Copyright 1996-2004 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
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================
package net.lightbody.bmp.proxy.jetty.util;
// ====================================================================
/** 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.
*
* @version $Revision: 1.16 $
* @author Greg Wilkins (gregw)
*/
public class StringUtil
{
public static final String __LINE_SEPARATOR=
System.getProperty("line.separator","\n");
public final static String __ISO_8859_1;
static
{
String iso=System.getProperty("ISO_8859_1");
if (iso!=null)
__ISO_8859_1=iso;
else
{
try{
new String(new byte[]{(byte)20},"ISO-8859-1");
iso="ISO-8859-1";
}
catch(java.io.UnsupportedEncodingException e)
{
iso="ISO8859_1";
}
__ISO_8859_1=iso;
}
}
public final static String __UTF_8="UTF-8";
private static char[] lowercases = {
'\000','\001','\002','\003','\004','\005','\006','\007',
'\010','\011','\012','\013','\014','\015','\016','\017',
'\020','\021','\022','\023','\024','\025','\026','\027',
'\030','\031','\032','\033','\034','\035','\036','\037',
'\040','\041','\042','\043','\044','\045','\046','\047',
'\050','\051','\052','\053','\054','\055','\056','\057',
'\060','\061','\062','\063','\064','\065','\066','\067',
'\070','\071','\072','\073','\074','\075','\076','\077',
'\100','\141','\142','\143','\144','\145','\146','\147',
'\150','\151','\152','\153','\154','\155','\156','\157',
'\160','\161','\162','\163','\164','\165','\166','\167',
'\170','\171','\172','\133','\134','\135','\136','\137',
'\140','\141','\142','\143','\144','\145','\146','\147',
'\150','\151','\152','\153','\154','\155','\156','\157',
'\160','\161','\162','\163','\164','\165','\166','\167',
'\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)
{
c=s.toCharArray();
c[i]=c2;
break;
}
}
}
while (i-->0)
{
if(c[i]<=127)
c[i] = lowercases[c[i]];
}
return c==null?s:new String(c);
}
/* ------------------------------------------------------------ */
public static boolean startsWithIgnoreCase(String s,String w)
{
if (w==null)
return true;
if (s==null || s.length()<w.length())
return false;
for (int i=0;i<w.length();i++)
{
char c1=s.charAt(i);
char c2=w.charAt(i);
if (c1!=c2)
{
if (c1<=127)
c1=lowercases[c1];
if (c2<=127)
c2=lowercases[c2];
if (c1!=c2)
return false;
}
}
return true;
}
/* ------------------------------------------------------------ */
public static boolean endsWithIgnoreCase(String s,String w)
{
if (w==null)
return true;
int sl=s.length();
int wl=w.length();
if (s==null || sl<wl)
return false;
for (int i=wl;i-->0;)
{
char c1=s.charAt(--sl);
char c2=w.charAt(i);
if (c1!=c2)
{
if (c1<=127)
c1=lowercases[c1];
if (c2<=127)
c2=lowercases[c2];
if (c1!=c2)
return false;
}
}
return true;
}
/* ------------------------------------------------------------ */
/**
* returns the next index of a character from the chars string
*/
public static int indexFrom(String s,String chars)
{
for (int i=0;i<s.length();i++)
if (chars.indexOf(s.charAt(i))>=0)
return i;
return -1;
}
/* ------------------------------------------------------------ */
/**
* replace substrings within string.
*/
public static String replace(String s, String sub, String with)
{
int c=0;
int i=s.indexOf(sub,c);
if (i == -1)
return s;
StringBuffer buf = new StringBuffer(s.length()+with.length());
synchronized(buf)
{
do
{
buf.append(s.substring(c,i));
buf.append(with);
c=i+sub.length();
} while ((i=s.indexOf(sub,c))!=-1);
if (c<s.length())
buf.append(s.substring(c,s.length()));
return buf.toString();
}
}
/* ------------------------------------------------------------ */
/** Remove single or double quotes.
*/
public static String unquote(String s)
{
return QuotedStringTokenizer.unquote(s);
}
/* ------------------------------------------------------------ */
/** Append substring to StringBuffer
* @param buf StringBuffer to append to
* @param s String to append from
* @param offset The offset of the substring
* @param length The length of the substring
*/
public static void append(StringBuffer buf,
String s,
int offset,
int length)
{
synchronized(buf)
{
int end=offset+length;
for (int i=offset; i<end;i++)
{
if (i>=s.length())
break;
buf.append(s.charAt(i));
}
}
}
/* ------------------------------------------------------------ */
public static void append(StringBuffer buf,byte b,int base)
{
int bi=0xff&b;
int c='0'+(bi/base)%base;
if (c>'9')
c= 'a'+(c-'0'-10);
buf.append((char)c);
c='0'+bi%base;
if (c>'9')
c= 'a'+(c-'0'-10);
buf.append((char)c);
}
/* ------------------------------------------------------------ */
public static void append2digits(StringBuffer buf,int i)
{
if (i<100)
{
buf.append((char)(i/10+'0'));
buf.append((char)(i%10+'0'));
}
}
/* ------------------------------------------------------------ */
/** Return a non null string.
* @param s String
* @return The string passed in or empty string if it is null.
*/
public static String nonNull(String s)
{
if (s==null)
return "";
return s;
}
/* ------------------------------------------------------------ */
public static boolean equals(String s,char[] buf, int offset, int length)
{
if (s.length()!=length)
return false;
for (int i=0;i<length;i++)
if (buf[offset+i]!=s.charAt(i))
return false;
return true;
}
}