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/*
Chapter 3 - Simple Protocols
Java 2 Network Protocols Black Book
by Al Williams
Paraglyph Press 2001
*/
/**
* A class that encodes URL parameter values
* for MIDP devices.
*/
public class EncodeURL {
// The characters that do not need to
// be converted.
private static final String noEncode =
"abcdefghijklmnopqrstuvwxyz" +
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
"0123456789.*-_";
// Mapping value values 0 through 15 to the
// corresponding hexadecimal character.
private static final char[] hexDigits = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
// Encodes the given string as required for
// use in a URL query string or POST data.
public static String encode(String src) {
StringBuffer result = new StringBuffer(src.length());
int count = src.length();
for (int i = 0; i < count; i++) {
char c = src.charAt(i);
if (noEncode.indexOf(c) != -1) {
// This is a character that does not
// need to be encoded
result.append(c);
continue;
}
// Space is converted to '+'
if (c == ' ') {
result.append('+');
continue;
}
// The remaining characters must be converted to
// '%XY' where 'XY' is the hexadecimal value of
// the character itself.
result.append('%');
result.append(hexDigits[(c >> 4) & 0xF]);
result.append(hexDigits[c & 0xF]);
}
return result.toString();
}
}
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