com.sun.tools.rngom.util.Uri Maven / Gradle / Ivy
/*
* Copyright (C) 2004-2011
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.sun.tools.rngom.util;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.UnsupportedEncodingException;
public class Uri {
private static String utf8 = "UTF-8";
public static boolean isValid(String s) {
return isValidPercent(s) && isValidFragment(s) && isValidScheme(s);
}
private static final String HEX_DIGITS = "0123456789abcdef";
public static String escapeDisallowedChars(String s) {
StringBuilder buf = null;
int len = s.length();
int done = 0;
for (;;) {
int i = done;
for (;;) {
if (i == len) {
if (done == 0)
return s;
break;
}
if (isExcluded(s.charAt(i)))
break;
i++;
}
if (buf == null)
buf = new StringBuilder();
if (i > done) {
buf.append(s.substring(done, i));
done = i;
}
if (i == len)
break;
for (i++; i < len && isExcluded(s.charAt(i)); i++)
;
String tem = s.substring(done, i);
byte[] bytes;
try {
bytes = tem.getBytes(utf8);
}
catch (UnsupportedEncodingException e) {
utf8 = "UTF8";
try {
bytes = tem.getBytes(utf8);
}
catch (UnsupportedEncodingException e2) {
// Give up
return s;
}
}
for (int j = 0; j < bytes.length; j++) {
buf.append('%');
buf.append(HEX_DIGITS.charAt((bytes[j] & 0xFF) >> 4));
buf.append(HEX_DIGITS.charAt(bytes[j] & 0xF));
}
done = i;
}
return buf.toString();
}
private static final String excluded = "<>\"{}|\\^`";
private static boolean isExcluded(char c) {
return c <= 0x20 || c >= 0x7F || excluded.indexOf(c) >= 0;
}
private static boolean isAlpha(char c) {
return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
}
private static boolean isHexDigit(char c) {
return ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F') || isDigit(c);
}
private static boolean isDigit(char c) {
return '0' <= c && c <= '9';
}
private static boolean isSchemeChar(char c) {
return isAlpha(c) || isDigit(c) || c == '+' || c == '-' || c =='.';
}
private static boolean isValidPercent(String s) {
int len = s.length();
for (int i = 0; i < len; i++)
if (s.charAt(i) == '%') {
if (i + 2 >= len)
return false;
else if (!isHexDigit(s.charAt(i + 1))
|| !isHexDigit(s.charAt(i + 2)))
return false;
}
return true;
}
private static boolean isValidFragment(String s) {
int i = s.indexOf('#');
return i < 0 || s.indexOf('#', i + 1) < 0;
}
private static boolean isValidScheme(String s) {
if (!isAbsolute(s))
return true;
int i = s.indexOf(':');
if (i == 0
|| i + 1 == s.length()
|| !isAlpha(s.charAt(0)))
return false;
while (--i > 0)
if (!isSchemeChar(s.charAt(i)))
return false;
return true;
}
public static String resolve(String baseUri, String uriReference) {
if (!isAbsolute(uriReference) && baseUri != null && isAbsolute(baseUri)) {
try {
return new URL(new URL(baseUri), uriReference).toString();
}
catch (MalformedURLException e) { }
}
return uriReference;
}
public static boolean hasFragmentId(String uri) {
return uri.indexOf('#') >= 0;
}
public static boolean isAbsolute(String uri) {
int i = uri.indexOf(':');
if (i < 0)
return false;
while (--i >= 0) {
switch (uri.charAt(i)) {
case '#':
case '/':
case '?':
return false;
}
}
return true;
}
}