ReferenceURLStreamHandler.java

00001 /*
00002  * Copyright (c) 2003-2004, KNOPFLERFISH project
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following
00007  * conditions are met:
00008  *
00009  * - Redistributions of source code must retain the above copyright
00010  *   notice, this list of conditions and the following disclaimer.
00011  *
00012  * - Redistributions in binary form must reproduce the above
00013  *   copyright notice, this list of conditions and the following
00014  *   disclaimer in the documentation and/or other materials
00015  *   provided with the distribution.
00016  *
00017  * - Neither the name of the KNOPFLERFISH project nor the names of its
00018  *   contributors may be used to endorse or promote products derived
00019  *   from this software without specific prior written permission.
00020  *
00021  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00022  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00023  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00024  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
00025  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00026  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
00027  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00028  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00029  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
00030  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00031  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
00032  * OF THE POSSIBILITY OF SUCH DAMAGE.
00033  */
00034 
00035 package org.knopflerfish.framework;
00036 
00037 import java.io.*;
00038 import java.net.*;
00039 
00040 
00056 public class ReferenceURLStreamHandler extends URLStreamHandler {
00057 
00058   final public static String PROTOCOL = "reference";
00059 
00060   ReferenceURLStreamHandler() {
00061     super();
00062   }
00063 
00069   public URLConnection openConnection(URL url) throws IOException {
00070     URL actual = new URL(getActual(url));
00071     
00072     if(!"file".equals(actual.getProtocol())) {
00073       throw 
00074         new IOException("Only file: URLs are allowed as references, got " + url);
00075     }
00076 
00077     return actual.openConnection();
00078   }
00079 
00080 
00088   protected static String getActual(URL u) {
00089     String s = u.toString();
00090     if(!s.startsWith(PROTOCOL + ":")) {
00091       throw new IllegalArgumentException("URL " + u + " does not start with " + 
00092                                          PROTOCOL + ":");
00093     }
00094     return s.substring(PROTOCOL.length() + 1);
00095   }    
00096 }

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