1 /* IDLTypeHelper.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.CDR; 40 41 import gnu.CORBA.Minor; 42 43 import org.omg.CORBA.MARSHAL; 44 import org.omg.CORBA.portable.BoxedValueHelper; 45 import org.omg.CORBA.portable.InputStream; 46 import org.omg.CORBA.portable.OutputStream; 47 48 import java.io.Serializable; 49 import java.lang.reflect.Method; 50 import java.lang.reflect.Modifier; 51 52 /** 53 * Handles case when the CORBA IDL type with the known helper is wrapped into 54 * Value type. 55 * 56 * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org) 57 */ 58 public class IDLTypeHelper 59 implements BoxedValueHelper 60 { 61 /** 62 * A helper class. 63 */ 64 protected Class helper; 65 66 /** 67 * Argument values for Helper.id(). 68 */ 69 static final Object[] ARGS_ID_V = new Object[0]; 70 71 /** 72 * Argument types for Helper.id()). 73 */ 74 static final Class[] ARGS_ID = new Class[0]; 75 76 /** 77 * Argument types for Helper.read. 78 */ 79 static final Class[] ARGS_READ = new Class[] { org.omg.CORBA.portable.InputStream.class }; 80 81 /** 82 * Create an IDLTypeHelper that works via given helper class. 83 */ IDLTypeHelper(Class a_helperClass)84 public IDLTypeHelper(Class a_helperClass) 85 { 86 helper = a_helperClass; 87 } 88 89 /** 90 * Get the Id, returned by this helper (use reflection). 91 */ get_id()92 public String get_id() 93 { 94 try 95 { 96 Method m = helper.getMethod("id", ARGS_ID); 97 return (String) m.invoke(null, ARGS_ID_V); 98 } 99 catch (Exception ex) 100 { 101 MARSHAL m = new MARSHAL(msg() + " id()"); 102 m.minor = Minor.Boxed; 103 m.initCause(ex); 104 throw m; 105 } 106 } 107 108 /** 109 * Read an instance from the stream. 110 */ read_value(InputStream input)111 public Serializable read_value(InputStream input) 112 { 113 try 114 { 115 Method m = helper.getMethod("read", ARGS_READ); 116 return (Serializable) m.invoke(null, new Object[] { input }); 117 } 118 catch (Exception ex) 119 { 120 MARSHAL m = new MARSHAL(msg() + " read(..)"); 121 m.minor = Minor.Boxed; 122 m.initCause(ex); 123 throw m; 124 } 125 } 126 127 /** 128 * Write the instance to the stream. 129 */ write_value(OutputStream output, Serializable value)130 public void write_value(OutputStream output, Serializable value) 131 { 132 try 133 { 134 Method[] m = helper.getMethods(); 135 136 for (int i = 0; i < m.length; i++) 137 { 138 if (m[i].getName().equals("write") 139 && ((m[i].getModifiers() & Modifier.STATIC) != 0)) 140 { 141 Class[] p = m[i].getParameterTypes(); 142 143 if (p.length == 2 && OutputStream.class.isAssignableFrom(p[0]) 144 && p[1].isAssignableFrom(value.getClass())) 145 { 146 m[i].invoke(null, new Object[] { output, value }); 147 return; 148 } 149 } 150 } 151 } 152 catch (Exception ex) 153 { 154 MARSHAL m = new MARSHAL(msg() + " write(..)"); 155 m.minor = Minor.Boxed; 156 m.initCause(ex); 157 throw m; 158 } 159 } 160 161 /** 162 * Create the start of message for exceptions. 163 */ msg()164 String msg() 165 { 166 return "Failed calling " + helper.getName() + " method: "; 167 } 168 169 } 170