Utility class for URL encoding.
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//package flex.messaging.util;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
/**
* Utility class for URL encoding.
*
* @exclude
*/
public final class URLEncoder {
public static String charset = "UTF8";
private URLEncoder() {
}
public static String encode(String s) {
try {
return encode(s, charset);
} catch (UnsupportedEncodingException ex) {
throw new IllegalArgumentException(charset);
}
}
public static String encode(String s, String enc)
throws UnsupportedEncodingException {
if (!needsEncoding(s)) {
return s;
}
int length = s.length();
StringBuffer out = new StringBuffer(length);
ByteArrayOutputStream buf = new ByteArrayOutputStream(10); // why 10?
// w3c says
// so.
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(buf,
enc));
for (int i = 0; i < length; i++) {
int c = (int) s.charAt(i);
if (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c >= '0'
&& c <= '9' || c == ' ') {
if (c == ' ') {
c = '+';
}
toHex(out, buf.toByteArray());
buf.reset();
out.append((char) c);
} else {
try {
writer.write(c);
if (c >= 0xD800 && c <= 0xDBFF && i < length - 1) {
int d = (int) s.charAt(i + 1);
if (d >= 0xDC00 && d <= 0xDFFF) {
writer.write(d);
i++;
}
}
writer.flush();
} catch (IOException ex) {
throw new IllegalArgumentException(s);
}
}
}
try {
writer.close();
} catch (IOException ioe) {
// Ignore exceptions on close.
}
toHex(out, buf.toByteArray());
return out.toString();
}
private static void toHex(StringBuffer buffer, byte[] b) {
for (int i = 0; i < b.length; i++) {
buffer.append('%');
char ch = Character.forDigit((b[i] >> 4) & 0xF, 16);
if (Character.isLetter(ch)) {
ch -= 32;
}
buffer.append(ch);
ch = Character.forDigit(b[i] & 0xF, 16);
if (Character.isLetter(ch)) {
ch -= 32;
}
buffer.append(ch);
}
}
private static boolean needsEncoding(String s) {
if (s == null)
return false;
for (int i = 0; i < s.length(); i++) {
int c = (int) s.charAt(i);
if (!(c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c >= '0'
&& c <= '9'))
return true;
// Otherwise, keep going
}
return false;
}
}
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