GNU Classpath (0.20) | |
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1: /* MarshalledObject.java -- 2: Copyright (c) 1996, 1997, 1998, 1999, 2004 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 java.rmi; 40: 41: import gnu.java.rmi.RMIMarshalledObjectInputStream; 42: import gnu.java.rmi.RMIMarshalledObjectOutputStream; 43: 44: import java.io.ByteArrayOutputStream; 45: import java.io.Serializable; 46: 47: /** 48: * FIXME - doc missing 49: */ 50: public final class MarshalledObject implements Serializable 51: { 52: //The following fields are from Java API Documentation "Serialized form" 53: private static final long serialVersionUID = 8988374069173025854L; 54: byte[] objBytes; 55: byte[] locBytes; 56: int hash; 57: 58: public MarshalledObject(Object obj) throws java.io.IOException 59: { 60: ByteArrayOutputStream objStream = new ByteArrayOutputStream(); 61: RMIMarshalledObjectOutputStream stream = new RMIMarshalledObjectOutputStream(objStream); 62: stream.writeObject(obj); 63: stream.flush(); 64: objBytes = objStream.toByteArray(); 65: locBytes = stream.getLocBytes(); 66: 67: //The following algorithm of calculating hashCode is similar to String 68: hash = 0; 69: for (int i = 0; i < objBytes.length; i++) 70: hash = hash * 31 + objBytes[i]; 71: if(locBytes != null) 72: for (int i = 0; i < locBytes.length; i++) 73: hash = hash * 31 + locBytes[i]; 74: } 75: 76: public boolean equals(Object obj) 77: { 78: if (! (obj instanceof MarshalledObject)) 79: return false; 80: 81: // hashCode even differs, don't do the time-consuming comparisons 82: if (obj.hashCode() != hash) 83: return false; 84: 85: MarshalledObject aobj = (MarshalledObject)obj; 86: if (objBytes == null || aobj.objBytes == null) 87: return objBytes == aobj.objBytes; 88: if (objBytes.length != aobj.objBytes.length) 89: return false; 90: for (int i = 0; i < objBytes.length; i++) 91: { 92: if (objBytes[i] != aobj.objBytes[i]) 93: return false; 94: } 95: // Ignore comparison of locBytes(annotation) 96: return true; 97: } 98: 99: public Object get() 100: throws java.io.IOException, java.lang.ClassNotFoundException 101: { 102: if(objBytes == null) 103: return null; 104: RMIMarshalledObjectInputStream stream = 105: new RMIMarshalledObjectInputStream(objBytes, locBytes); 106: return stream.readObject(); 107: } 108: 109: public int hashCode() { 110: return hash; 111: } 112: 113: }
GNU Classpath (0.20) |