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1: /* EmptyStructHolder.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.BAD_OPERATION; 42: import org.omg.CORBA.NO_IMPLEMENT; 43: import org.omg.CORBA.TypeCode; 44: import org.omg.CORBA.UNKNOWN; 45: import org.omg.CORBA.UnknownUserException; 46: import org.omg.CORBA.portable.InputStream; 47: import org.omg.CORBA.portable.OutputStream; 48: import org.omg.CORBA.portable.Streamable; 49: 50: /** 51: * This holder can store any CORBA exception that has no user defined fields. 52: * Only the repository ID is written when the method {@link #_write} is called. 53: * The _read method is not supported for this holder. 54: * 55: * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org) 56: */ 57: public class EmptyExceptionHolder 58: implements Streamable 59: { 60: /** 61: * The wrapped exception. 62: */ 63: public Throwable value; 64: 65: /** 66: * The typecode of the wrapped exception. 67: */ 68: public TypeCode typecode; 69: 70: /** 71: * Create the exception holder, initialised to the given values. 72: * 73: * @param an_exception the wrapped exception. 74: * @param an_id the exception repository id. 75: */ 76: public EmptyExceptionHolder(Throwable an_exception, TypeCode a_typecode) 77: { 78: value = an_exception; 79: typecode = a_typecode; 80: } 81: 82: /** 83: * Reads the exception from the input stream. 84: * 85: * The value field obtains the value of either the read exception or 86: * the UNKNOWN if the repository ID does not match 87: * the exception from the reachable code. 88: */ 89: public void _read(InputStream input) 90: { 91: String id = input.read_string(); 92: Object ex = ObjectCreator.Idl2Object(id); 93: if (ex == null) 94: value = new UNKNOWN(id); 95: else 96: value = (Throwable) ex; 97: } 98: 99: /** 100: * Return the typecode of the stored exception. 101: * 102: * @return the value, passed as a_typecode in constructor. 103: */ 104: public TypeCode _type() 105: { 106: return typecode; 107: } 108: 109: /** 110: * Write the exception into the give output stream. Writes the 111: * repository id that is taken from the typecode. This method also 112: * works when no helper class is available. 113: * 114: * @param output a stream to write into. 115: * 116: * @throws BAD_OPERATION if the value for the holder is not set or 117: * the typecode cannot provide repository id. 118: */ 119: public void _write(OutputStream output) 120: { 121: try 122: { 123: output.write_string(typecode.id()); 124: } 125: catch (Exception ex) 126: { 127: BAD_OPERATION bad = new BAD_OPERATION(); 128: bad.minor = Minor.CDR; 129: bad.initCause(ex); 130: throw bad; 131: } 132: }