1 /* 2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.net.spi; 27 28 import java.net.URLStreamHandlerFactory; 29 30 /** 31 * URL stream handler service-provider class. 32 * 33 *<p> A URL stream handler provider is a concrete subclass of this class that 34 * has a zero-argument constructor. URL stream handler providers may be 35 * installed in an instance of the Java platform by adding them to the 36 * application class path. 37 * 38 * <p> A URL stream handler provider identifies itself with a 39 * provider-configuration file named java.net.spi.URLStreamHandlerProvider in 40 * the resource directory META-INF/services. The file should contain a list of 41 * fully-qualified concrete URL stream handler provider class names, one per 42 * line. 43 * 44 * <p> URL stream handler providers are located at runtime, as specified in the 45 * {@linkplain java.net.URL#URL(String,String,int,String) URL constructor}. 46 * 47 * @since 1.9 48 */ 49 public abstract class URLStreamHandlerProvider 50 implements URLStreamHandlerFactory 51 { 52 private static Void checkPermission() { 53 SecurityManager sm = System.getSecurityManager(); 54 if (sm != null) 55 sm.checkPermission(new RuntimePermission("setFactory")); 56 return null; 57 } 58 private URLStreamHandlerProvider(Void ignore) { } 59 60 /** 61 * Initializes a new URL stream handler provider. 62 * 63 * @throws SecurityException 64 * If a security manager has been installed and it denies 65 * {@link RuntimePermission}{@code ("setFactory")}. 66 */ 67 protected URLStreamHandlerProvider() { 68 this(checkPermission()); 69 } 70 }