1 /* StubLocator.java -- 2 Copyright (C) 2005 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 39 package gnu.CORBA; 40 41 import org.omg.CORBA.ORB; 42 import org.omg.CORBA.portable.ObjectImpl; 43 44 /** 45 * Finds a stub class like "_HelloStub" that can be instantiated 46 * from IOR reference. The returned object can be casted to the 47 * used type like "Hello" without using the helper .narrow method, 48 * and the object is not unnsecessarily re - instantiated if 49 * the .narrow method is used anyway. If no stub, matching the naming 50 * conventions, is available, the returned stub replacement can still be used 51 * to get the valid request, add parameter and invoke the method by name. 52 * 53 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) 54 */ 55 public class StubLocator 56 { 57 /** 58 * Search for the possibly available default stub. 59 * 60 * @param orb the current ORB. It is not required to find the binding 61 * classes, but is needed to instantiate the default implementation 62 * if no binding classes are found. 63 * 64 * @param ior the IOR, possibly containing the information about the 65 * correct implementation class. 66 */ search(ORB orb, IOR ior)67 public static ObjectImpl search(ORB orb, IOR ior) 68 { 69 try 70 { 71 int a = ior.Id.indexOf(':'); 72 int b = ior.Id.lastIndexOf(':'); 73 74 String s = ior.Id.substring(a + 1, b).replace('/', '.'); 75 76 String path; 77 78 b = s.lastIndexOf('.'); 79 if (b > 0) 80 path = s.substring(0, b + 1); 81 else 82 path = ""; 83 84 String stub = "_" + s.substring(b + 1) + "Stub"; 85 86 Class stubClass = ObjectCreator.forName(path + stub); 87 88 return (ObjectImpl) stubClass.newInstance(); 89 } 90 catch (Exception failed) 91 { 92 // Various exceptions can be thrown if the Id cannot be parsed, 93 // the class is missing, cannot be instantiated or is not an 94 // instance of the ObjectImpl. 95 return createDefaultStub(orb, ior); 96 } 97 } 98 99 /** 100 * Return the default stub for the case when the client binding classes 101 * are not locally available. The returned stub can still be used 102 * to get the valid request, add parameter and invoke the method by name. 103 * 104 * @return the default implementation. 105 */ createDefaultStub(ORB orb, IOR ior)106 protected static ObjectImpl createDefaultStub(ORB orb, IOR ior) 107 { 108 return new IorObject(orb, ior); 109 } 110 } 111