Source Code Cross Referenced for Filter.java in  » 6.0-JDK-Modules » java-3d » com » db » server » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » java 3d » com.db.server 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2001 Silvere Martin-Michiellot All Rights Reserved.
003:         *
004:         * Silvere Martin-Michiellot grants you ("Licensee") a non-exclusive,
005:         * royalty free, license to use, modify and redistribute this
006:         * software in source and binary code form,
007:         * provided that i) this copyright notice and license appear on all copies of
008:         * the software; and ii) Licensee does not utilize the software in a manner
009:         * which is disparaging to Silvere Martin-Michiellot.
010:         *
011:         * This software is provided "AS IS," without a warranty of any kind. ALL
012:         * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
013:         * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
014:         * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. Silvere Martin-Michiellot
015:         * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES
016:         * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
017:         * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL
018:         * Silvere Martin-Michiellot OR ITS LICENSORS BE LIABLE
019:         * FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
020:         * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
021:         * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
022:         * OR INABILITY TO USE SOFTWARE, EVEN IF Silvere Martin-Michiellot HAS BEEN
023:         * ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
024:         *
025:         * This software is not designed or intended for use in on-line control of
026:         * aircraft, air traffic, aircraft navigation or aircraft communications; or in
027:         * the design, construction, operation or maintenance of any nuclear
028:         * facility. Licensee represents and warrants that it will not use or
029:         * redistribute the Software for such purposes.
030:         *
031:         * @Author: Silvere Martin-Michiellot
032:         *
033:         */
034:
035:        package com.db.server;
036:
037:        import java.io.Serializable;
038:        import com.db.net.*;
039:
040:        /**
041:         */
042:
043:        //In a big community, lords will probably be notified about many vassals actions (requests from their vassals to access land...). This should rapidly create an
044:        //unwanted network overload as well as a lot of unwanted junk data. A filter mechanism is proposed in which users can decide not to be notified when a
045:        //vassal makes a request (the notification message is not send from the server). The filter is a list of pairs key-key value.
046:        //The key mentions the Object concerned and the kind of request:
047:        //       Request field read - field write (of an object, tool, guide, avatar, land, World Spot)
048:        //       Request action execution (of an object, tool, guide, avatar, land, World Spot), the action may involve creation, modification or deletion of an object,
049:        //       tool, guide, avatar, land.
050:        //The key-value is given with 6 booleans to grant notification about users' actions for the owner himself, lords, invited lords, peers, peers vassals and vassals.
051:        //Using the notification filter, users can choose not to see or hear or collide from objects, tools, guides, avatars, owners (corresponding fields in the avatar).
052:        //Users that make no filtering will have a log of every actions about themselves, lords, invited lords, peers, peers vassals and vassals. Since lords can also
053:        //decide to refuse to be queried, this log can be incomplete. The only complete log is the one of the top lord if he requests no filtering.
054:        //
055:        //the notification filter mentions positive notification
056:        //users are notified of nothing (except answers to their requests) if they do not request anything
057:        //if a user want to be notified of a lord visiting one of its lands then he has to add en entry in the notification filter
058:        //as of this version, we do not use filters where object is an instance of Avatar
059:        //ie: you can't track avatar creation, deletion, read or write
060:        public class Filter extends Object implements  Serializable {
061:
062:            //Read access on the Object
063:            public final static int READ_ACCESS = 1;
064:            //Write (and read) access on the Object
065:            public final static int READ_WRITE_ACCESS = 2;
066:            //Addition of an Object (in the library if it is a class or in the world if it is an object)
067:            public final static int ADDITION = 3;
068:            //Deletion of an Object (from the library if it is a class or from the world if it is an object)
069:            public final static int DELETION = 4;
070:
071:            private Avatar requester;
072:            //object is one of VirtualElement, Avatar
073:            private Object object;
074:            private int accessKind;
075:
076:            //builds up a new filter for the user (requester) to be notified of actions (accessKind) on the object (VirtualElement, Avatar) from a specific kind of user (Avatar.LORD, Avatar.PEERSLORD, Avatar.PEER, Avatar.PEERSVASSAL, Avatar.VASSAL and Avatar.SELF)
077:            //client log of the user then receives and appends every request provided the user has the rights himself to access the object
078:            //Filter does NOT notify about filter access writes (as this would lead to infinite access)
079:            //Filter therefore defines log you want to read, not the opposite which would lead to really big traffic
080:
081:            //Filters should be the last priority on the server for all users but the ruler
082:            //If performance is really to low, server should stop to send notifications to the clients (except ruler) to do some more interesting job
083:
084:            //Ruler may wish to build or not filters so that he has a log of some or all actions
085:            public Filter(Avatar requester, Object object, int accessKind) {
086:
087:                if ((object instanceof  VirtualElement)
088:                        || (object instanceof  Avatar)
089:                        || (object instanceof  Class)) {
090:                    if ((accessKind >= Filter.READ_ACCESS)
091:                            && (accessKind <= Filter.DELETION)) {
092:                        this .requester = requester;
093:                        this .object = object;
094:                        this .accessKind = accessKind;
095:                    } else {
096:                        throw new IllegalArgumentException(
097:                                "filtering access kind must be one of Filter.READ_ACCESS, Filter.READ_WRITE_ACCESS, Filter.ADDITION or Filter.DELETION.");
098:                    }
099:                } else {
100:                    throw new IllegalArgumentException(
101:                            "object filtered must be an instance of VirtualElement, Avatar or Class.");
102:                }
103:
104:            }
105:
106:            public Avatar getRequester() {
107:
108:                return this .requester;
109:
110:            }
111:
112:            public Object getObject() {
113:
114:                return this .requester;
115:
116:            }
117:
118:            public int getAccessKind() {
119:
120:                return this.accessKind;
121:
122:            }
123:
124:        }
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