Source Code Cross Referenced for FileSystemEventHandlerBase.java in  » 6.0-JDK-Modules » j2me » javax » microedition » io » file » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » javax.microedition.io.file 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *   
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:
027:        package javax.microedition.io.file;
028:
029:        import com.sun.midp.events.*;
030:        import com.sun.midp.security.*;
031:
032:        import java.util.Enumeration;
033:        import java.util.Vector;
034:
035:        import com.sun.midp.io.j2me.file.Protocol;
036:
037:        /**
038:         * File system event handler.
039:         */
040:        abstract class FileSystemEventHandlerBase implements  EventListener {
041:
042:            /**
043:             * Inner class to request security token from SecurityInitializer.
044:             * SecurityInitializer should be able to check this inner class name.
045:             */
046:            static private class SecurityTrusted implements 
047:                    ImplicitlyTrustedClass {
048:            };
049:
050:            /** Security token to allow access to implementation APIs */
051:            private static SecurityToken classSecurityToken = SecurityInitializer
052:                    .requestToken(new SecurityTrusted());
053:
054:            /**
055:             * The EventListener to receive the MM events.
056:             */
057:            private static EventListener listener;
058:
059:            /**
060:             * Default constructor.
061:             * Registers current isolate as interested in receiving mount/unmount
062:             * events.
063:             */
064:            public FileSystemEventHandlerBase() {
065:                registerListener();
066:            }
067:
068:            /**
069:             * Performs clean up upon object destruction.
070:             * Removes current isolate from the list of isolates interested in
071:             * receiving mount/unmount events.
072:             */
073:            private native void finalize();
074:
075:            /**
076:             * Registers current isolate as interested in receiving mount/unmount
077:             * events.
078:             */
079:            private native void registerListener();
080:
081:            /**
082:             * Register the event listener in the event queue.
083:             *
084:             * Security note: access specifier for this method is 'package private'
085:             * so only classes from this package can access it.
086:             *
087:             * @param l <code>EventListener</code> for the MM events.
088:             */
089:            static void setListener(EventListener l) {
090:                // Listener can be set only once.
091:                if (listener != null) {
092:                    return;
093:                }
094:                listener = l;
095:
096:                EventQueue evtq = EventQueue.getEventQueue(classSecurityToken);
097:                evtq.registerEventListener(EventTypes.FC_DISKS_CHANGED_EVENT,
098:                        listener);
099:            }
100:
101:            /**
102:             * Preprocess an event that is being posted to the event queue.
103:             * This method will get called in the thread that posted the event.
104:             *
105:             * @param event event being posted
106:             *
107:             * @param waitingEvent previous event of this type waiting in the
108:             *     queue to be processed
109:             *
110:             * @return <code>true</code> to allow the post to continue,
111:             *         <code>false</code> to not post the event to the queue
112:             */
113:            public boolean preprocess(Event event, Event waitingEvent) {
114:                if (event.getType() != EventTypes.FC_DISKS_CHANGED_EVENT) {
115:                    return false;
116:                }
117:
118:                if (waitingEvent != null) {
119:                    return false;
120:                }
121:
122:                return true;
123:            }
124:
125:            /**
126:             * Process an event.
127:             * This method will get called in the event queue processing thread.
128:             *
129:             * @param event event to process
130:             */
131:            public void process(Event event) {
132:                if (event.getType() != EventTypes.FC_DISKS_CHANGED_EVENT) {
133:                    return;
134:                }
135:
136:                // Get up-to-date roots list from OS
137:                Vector newRoots = Protocol.listRoots();
138:
139:                // Get cached roots list from FileSystemRegistry
140:                Vector oldRoots = new Vector(newRoots.size() + 1);
141:                for (Enumeration e = FileSystemRegistry.listCachedRoots(); e
142:                        .hasMoreElements();) {
143:                    oldRoots.addElement(e.nextElement());
144:                }
145:
146:                // Find all removed roots and notify FileSystemRegistry about them
147:                for (int i = 0; i < oldRoots.size(); i++) {
148:                    String root = (String) oldRoots.elementAt(i);
149:                    if (!newRoots.contains(root)) {
150:                        FileSystemRegistry.removeRoot(root);
151:                    } else {
152:                        newRoots.removeElement(root);
153:                    }
154:                }
155:
156:                // Notify FileSystemRegistry about all added roots if any
157:                for (int i = 0; i < newRoots.size(); i++) {
158:                    String root = (String) newRoots.elementAt(i);
159:                    FileSystemRegistry.addRoot(root);
160:                }
161:            }
162:        }
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