/*
* @(#)URLEncoder.java 1.3 95/11/08 Herb Jellinek
*
* Copyright (c) 1994-1995 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL or COMMERCIAL purposes and
* without fee is hereby granted.
* Please refer to the file http://java.sun.com/copy_trademarks.html
* for further important copyright and trademark information and to
* http://java.sun.com/licensing.html for further important licensing
* information for the Java (tm) Technology.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*
* THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE
* CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING FAIL-SAFE
* PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES, AIRCRAFT
* NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT LIFE
* SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE
* SOFTWARE COULD LEAD DIRECTLY TO DEATH, PERSONAL INJURY, OR SEVERE
* PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH RISK ACTIVITIES"). SUN
* SPECIFICALLY DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR
* HIGH RISK ACTIVITIES.
*/
package java.net;
import java.io.ByteArrayOutputStream;
import java.util.BitSet;
/**
* URLEncoder: turns Strings of text into x-www-form-urlencoded format.
*
* @version 1.3, 08 Nov 1995
* @author Herb Jellinek
*/
public class URLEncoder {
static BitSet dontNeedEncoding;
static {
dontNeedEncoding = new BitSet(256);
int i;
for (i = 'a'; i <= 'z'; i++) {
dontNeedEncoding.set(i);
}
for (i = 'A'; i <= 'Z'; i++) {
dontNeedEncoding.set(i);
}
for (i = '0'; i <= '9'; i++) {
dontNeedEncoding.set(i);
}
dontNeedEncoding.set('_');
dontNeedEncoding.set(' ');
}
/**
* You can't call the constructor.
*/
private URLEncoder() { }
/**
* encode - translate String into x-www-form-urlencoded format.
* @param s String to be translated
* @return the translated String.
*/
public static String encode(String s) {
ByteArrayOutputStream out = new ByteArrayOutputStream(s.length());
for (int i = 0; i < s.length(); i++) {
int c = (int)s.charAt(i);
if (dontNeedEncoding.get(c)) {
if (c == ' ') {
c = '+';
}
out.write(c);
} else {
out.write('%');
out.write(Character.forDigit(c >> 4, 16));
out.write(Character.forDigit(c & 0xF, 16));
}
}
return out.toString();
}
}