Source Code Cross Referenced for MIDletEventProducer.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » midlet » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.midp.midlet 
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 com.sun.midp.midlet;
028:
029:        import com.sun.midp.events.EventTypes;
030:        import com.sun.midp.events.NativeEvent;
031:        import com.sun.midp.events.EventQueue;
032:
033:        /**
034:         * This class provides methods to send events of types 
035:         * handled by MIDletEventConsumer I/F implementors. 
036:         * This class completely hide event construction & sending in its methods.
037:         *
038:         * The primary user of this class are MIDletProxyList & MIDletProxy 
039:         * in AMS isolate. Threrefore ve can use MIdletProxy object reference 
040:         * as sendXXXEvent() method parameter instead of currently used int IDs.
041:         * 
042:         * Generic comments for all XXXEventProducers:
043:         *
044:         * For each supported event type there is a separate sendXXXEvent() method, 
045:         * that gets all needed parameters to construct an event of an approprate class.
046:         * The method also performs event sending itself.
047:         *
048:         * If a given event type merges a set of logically different subtypes, 
049:         * this class shall provide separate methods for these subtypes.
050:         *
051:         * It is assumed that only one object instance of this class
052:         * is initialized with the system event that is created at (isolate) startup. 
053:         *
054:         * This class only operates on the event queue given to it during
055:         * construction, the class does not obtain any restricted object itself,
056:         * so it does not need protection.
057:         *
058:         * All MIDP stack subsystems that need to send events of supported types, 
059:         * must get a reference to an already created istance of this class. 
060:         * Typically, this instance should be passed as a constructor parameter.
061:         *
062:         * Class is NOT final to allow debug/profile/test/automation subsystems
063:         * to change, substitute, complement default "event sending" functionality :
064:         * Ex. 
065:         * class LogXXXEventProducer 
066:         *      extends XXXEventProducer {
067:         *  ...
068:         *  void sendXXXEvent(parameters) {
069:         *      LOG("Event of type XXX is about to be sent ...")
070:         *      super.sendXXXEvent(parameters);
071:         *      LOG("Event of type XXX has been sent successfully !")
072:         *  }
073:         *  ...
074:         * }
075:         */
076:        public class MIDletEventProducer {
077:
078:            /** Cached reference to the MIDP event queue. */
079:            protected EventQueue eventQueue;
080:
081:            /**
082:             * Construct a new MIDletEventProducer.
083:             *
084:             * @param  theEventQueue An event queue where new events will be posted.
085:             */
086:            public MIDletEventProducer(EventQueue theEventQueue) {
087:                eventQueue = theEventQueue;
088:            }
089:
090:            /*
091:             * MIDlet State Management (Lifecycle) Events
092:             *
093:             * ACTIVATE_MIDLET_EVENT
094:             * PAUSE_MIDLET_EVENT
095:             * DESTROY_MIDLET_EVENT
096:             *
097:             */
098:
099:            /**
100:             * Pause a MIDlet.
101:             * Probably: need some form of MIDlet ID instead of displayId.
102:             *           use MIDletProxy instead of 2 int ID parameters.
103:             *
104:             * @param isolateId ID of the target isolate (where to send event)
105:             * @param midletClassName class name of the MIDlet
106:             */
107:            public void sendMIDletActivateEvent(int isolateId,
108:                    String midletClassName) {
109:                sendMIDletEvent(EventTypes.ACTIVATE_MIDLET_EVENT, isolateId,
110:                        midletClassName);
111:            }
112:
113:            /**
114:             * Activate a MIDlet.
115:             * Former: void MIDletProxy.pauseMidlet();
116:             *
117:             * @param isolateId ID of the target isolate (where to send event)
118:             * @param midletClassName class name of the MIDlet
119:             */
120:            public void sendMIDletPauseEvent(int isolateId,
121:                    String midletClassName) {
122:                sendMIDletEvent(EventTypes.PAUSE_MIDLET_EVENT, isolateId,
123:                        midletClassName);
124:            }
125:
126:            /**
127:             * Destroy a MIDlet.
128:             * Former: void MIDletProxy.destroyMidlet();
129:             *
130:             * @param isolateId ID of the target isolate (where to send event)
131:             * @param midletClassName class name of the MIDlet
132:             */
133:            public void sendMIDletDestroyEvent(int isolateId,
134:                    String midletClassName) {
135:                sendMIDletEvent(EventTypes.DESTROY_MIDLET_EVENT, isolateId,
136:                        midletClassName);
137:            }
138:
139:            /**
140:             * Sends an event with the only integer parameter for display ID
141:             * to a MIDlet .
142:             *
143:             * @param eventType type of event to be sent
144:             * @param midletIsolateId ID of the target isolate
145:             * @param midletClassName class name of the MIDlet
146:             */
147:            private void sendMIDletEvent(int eventType, int midletIsolateId,
148:                    String midletClassName) {
149:                NativeEvent event = new NativeEvent(eventType);
150:
151:                event.stringParam1 = midletClassName;
152:
153:                eventQueue.sendNativeEventToIsolate(event, midletIsolateId);
154:            }
155:        }
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