001package votorola.g.web.gwt; // Copyright 2012, Michael Allan. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Votorola Software"), to deal in the Votorola Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Votorola Software, and to permit persons to whom the Votorola Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Votorola Software. THE VOTOROLA 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 VOTOROLA SOFTWARE OR THE USE OR OTHER DEALINGS IN THE VOTOROLA SOFTWARE. 002 003import com.google.gwt.http.client.URL; 004 005 006/** {@linkplain URL URL} utilities. 007 */ 008public final class URLX // cannot extend URL, it's final (2.3) 009{ 010 011 012 private URLX() {} 013 014 015 016 /** Encodes the path such that all reserved characters are escaped. 017 * 018 * @see URL#encodePathSegment(String) 019 * @see <a href='http://tools.ietf.org/html/rfc2396#section-3.3' 020 * target='_top'>Uniform Resource Identifiers (URI): Generic Syntax</a> 021 */ 022 public static String encodePath( final String decodedPath ) 023 { 024 // return URL.encodePathSegment(decodedPath).replace( "%2F", "/" ); 025 /// but it erroneously escapes non-reserved ':' and maybe others, so roll our own: 026 final StringBuilder b = GWTX.stringBuilderClear(); 027 for( int c = 0, cN = decodedPath.length(); c < cN; ++c ) 028 { 029 char ch = decodedPath.charAt( c ); 030 if( ch == ';' ) b.append( "%3B" ); 031 else if( ch == '=' ) b.append( "%3D" ); 032 else if( ch == '?' ) b.append( "%3F" ); 033 else b.append( ch ); 034 } 035 return b.toString(); 036 } 037 038 039 040 /** Returns an arbitrary value for adding to a request URL in order to defeat caching 041 * on the client side. The return value is not suitable for use in cryptography; it 042 * is based on a non-secure random number which is merely incremented on each call. 043 * It will contain no illegal characters and therefore need not be encoded for use in 044 * a query parameter or elsewhere in a URL. 045 */ 046 public static String serialNonce() 047 { 048 if( serial == -1 ) serial = Math.abs( com.google.gwt.user.client.Random.nextInt() ); 049 else serial = GWTX.wrapMaxInteger( ++serial, 0 ); 050 return Integer.toString( serial, /*radix*/36 ); 051 } 052 053 054 private static int serial = -1; 055 056 057}