Source Code Cross Referenced for AutoMIDletImpl.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » automation » 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.automation 
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.automation;
028:
029:        /**
030:         * AutoMIDlet interface implementation
031:         */
032:        final class AutoMIDletImpl implements  AutoMIDlet {
033:            /** MIDlet descriptor for this MIDlet */
034:            private AutoMIDletDescriptorImpl midletDescriptor;
035:
036:            /** For tracking life cycle states */
037:            private AutoStateTracker lifeCycleStateTracker;
038:
039:            /** For tracking background/foreground states */
040:            private AutoStateTracker foregroundStateTracker;
041:
042:            /** For switching MIDlet state */
043:            private static AutoMIDletStateController midletStateController = null;
044:
045:            /** For switching MIDlet state */
046:            private static AutoForegroundStateController foregroundStateController = null;
047:
048:            /**
049:             * Constructor.
050:             *
051:             * @param midletDescriptor MIDlet descriptor for this MIDlet
052:             */
053:            AutoMIDletImpl(AutoMIDletDescriptorImpl midletDescriptor) {
054:                this .midletDescriptor = midletDescriptor;
055:                this .lifeCycleStateTracker = new AutoStateTracker(
056:                        AutoMIDletLifeCycleState.PAUSED);
057:
058:                this .foregroundStateTracker = new AutoStateTracker(
059:                        AutoMIDletForegroundState.BACKGROUND);
060:
061:                if (midletStateController == null) {
062:                    midletStateController = AutoMIDletStateController
063:                            .getMIDletStateController();
064:                }
065:
066:                if (foregroundStateController == null) {
067:                    foregroundStateController = AutoForegroundStateController
068:                            .getForegroundStateController();
069:                }
070:            }
071:
072:            /**
073:             * To be called when MIDlet's life cycle state has changed.
074:             *
075:             * @param newState new life cycle state
076:             */
077:            void stateChanged(AutoMIDletLifeCycleState newState) {
078:                boolean interruptWaiters = false;
079:                if (newState == AutoMIDletLifeCycleState.DESTROYED) {
080:                    interruptWaiters = true;
081:                }
082:
083:                lifeCycleStateTracker.setCurrentState(newState,
084:                        interruptWaiters);
085:
086:                if (newState == AutoMIDletLifeCycleState.DESTROYED) {
087:                    foregroundStateTracker.interruptWait();
088:                    midletDescriptor.midletDestroyed();
089:                }
090:            }
091:
092:            /**
093:             * To be called when MIDlet's foreground state has changed.
094:             *
095:             * @param newState new forgeround state
096:             */
097:            void stateChanged(AutoMIDletForegroundState newState) {
098:                foregroundStateTracker.setCurrentState(newState, false);
099:            }
100:
101:            /**
102:             * Guarantees that MIDlet is not destroyed: if MIDlet
103:             * is destroyed, exception is thrown.
104:             *
105:             * @param s error string
106:             */
107:            private void guaranteeMIDletNotDestroyed(String s)
108:                    throws IllegalStateException {
109:
110:                if (lifeCycleStateTracker.getCurrentState() == AutoMIDletLifeCycleState.DESTROYED) {
111:                    throw new IllegalStateException(s);
112:                }
113:            }
114:
115:            /**
116:             * Guarantees that state transition is valid (possible):
117:             * if state is unreachable, exception is thrown.
118:             *
119:             * @param state state to check for
120:             * @param s error string
121:             */
122:            private void guaranteeStateTransitionIsValid(
123:                    AutoMIDletLifeCycleState state, String s)
124:                    throws IllegalStateException {
125:
126:                if (state != AutoMIDletLifeCycleState.DESTROYED) {
127:                    guaranteeMIDletNotDestroyed(s);
128:                }
129:            }
130:
131:            /**
132:             * Guarantees that waiting for state is valid: 
133:             * if state is unreachable, exception is thrown.
134:             *
135:             * @param state state to check for
136:             * @param s error string
137:             */
138:            private void guaranteeStateTransitionIsValid(
139:                    AutoMIDletForegroundState state, String s)
140:                    throws IllegalStateException {
141:
142:                guaranteeMIDletNotDestroyed(s);
143:            }
144:
145:            /**
146:             * AutoMIDlet implementation
147:             */
148:
149:            /**
150:             * Initiate a switch (transition) from current to specified 
151:             * lifecycle state.
152:             *
153:             * @param state state to switch to
154:             * @param wait if true, wait (block) until transition to the 
155:             * specified state has been completed
156:             * @throws IllegalStateException thrown when switching to specified
157:             * state is invalid
158:             */
159:            public void switchTo(AutoMIDletLifeCycleState state, boolean wait)
160:                    throws IllegalStateException {
161:
162:                synchronized (lifeCycleStateTracker) {
163:                    guaranteeStateTransitionIsValid(state, "switchTo");
164:
165:                    midletStateController.switchTo(this , state);
166:                    if (wait) {
167:                        waitFor(state);
168:                    }
169:                }
170:            }
171:
172:            /**
173:             * Initiate a switch (transition) from current to specified 
174:             * foreground state.
175:             *
176:             * @param state state to switch to
177:             * @param wait if true, wait (block) until transition to the 
178:             * specified state has been completed
179:             * @throws IllegalStateException thrown when switching to specified
180:             * state is invalid
181:             */
182:            public void switchTo(AutoMIDletForegroundState state, boolean wait)
183:                    throws IllegalStateException {
184:
185:                synchronized (foregroundStateTracker) {
186:                    guaranteeStateTransitionIsValid(state, "switchTo");
187:
188:                    foregroundStateController.switchTo(this , state);
189:                    if (wait) {
190:                        waitFor(state);
191:                    }
192:                }
193:            }
194:
195:            /**
196:             * Wait (block) until MIDlet reaches specified lifecycle state.
197:             *
198:             * @param state state to wait for
199:             * @throws IlegalStateException thrown if state to wait for is invalid,
200:             * or if during waiting MIDlet has reached the state where waiting for
201:             * specified state is no longer valid
202:             */
203:            public void waitFor(AutoMIDletLifeCycleState state)
204:                    throws IllegalStateException {
205:
206:                synchronized (lifeCycleStateTracker) {
207:                    guaranteeStateTransitionIsValid(state, "waitFor");
208:
209:                    // wait
210:                    lifeCycleStateTracker.waitFor(state);
211:
212:                    // wait might have been interrupted, so check again
213:                    // if waiting for this state is still valid
214:                    guaranteeStateTransitionIsValid(state, "waitFor");
215:                }
216:            }
217:
218:            /**
219:             * Wait (block) until MIDlet reaches specified foreground state.
220:             *
221:             * @param state state to wait for
222:             * @throws IlegalStateException thrown if state to wait for is invalid,
223:             * or if during waiting MIDlet has reached the state where waiting for
224:             * specified state is no longer valid
225:             */
226:            public void waitFor(AutoMIDletForegroundState state)
227:                    throws IllegalStateException {
228:
229:                synchronized (foregroundStateTracker) {
230:                    guaranteeStateTransitionIsValid(state, "waitFor");
231:
232:                    foregroundStateTracker.waitFor(state);
233:
234:                    // wait might have been interrupted, so check again
235:                    // if waiting for this state is still valid
236:                    guaranteeStateTransitionIsValid(state, "waitFor");
237:                }
238:            }
239:
240:            /**
241:             * Get current lifecycle state.
242:             *
243:             * @return AutoLifeCycleState representing current
244:             * lifecycle state
245:             */
246:            public AutoMIDletLifeCycleState getLifeCycleState() {
247:                synchronized (lifeCycleStateTracker) {
248:                    Object state = lifeCycleStateTracker.getCurrentState();
249:                    return (AutoMIDletLifeCycleState) state;
250:                }
251:            }
252:
253:            /**
254:             * Get current foreground state.
255:             *
256:             * @return AutoForegroundState representing current
257:             * foreground state
258:             */
259:            public AutoMIDletForegroundState getForegroundState() {
260:                synchronized (foregroundStateTracker) {
261:                    Object state = foregroundStateTracker.getCurrentState();
262:                    return (AutoMIDletForegroundState) state;
263:                }
264:            }
265:
266:            /**
267:             * Get MIDlet's event queue.
268:             *
269:             * @return AutoEventQueue representing event queue.
270:             */
271:            public AutoEventQueue getEventQueue() {
272:                return null;
273:            }
274:
275:            /**
276:             * Get MIDlet's descriptor.
277:             *
278:             * @return AutoMIDletDescriptor representing descriptor.
279:             */
280:            public AutoMIDletDescriptor getMIDletDescriptor() {
281:                return midletDescriptor;
282:            }
283:        }
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