Source Code Cross Referenced for PlaneImpl.java in  » 6.0-JDK-Modules » j2me » IXCDemo » ixcXlets » serverXlet » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » IXCDemo.ixcXlets.serverXlet 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)PlaneImpl.java	1.3 03/01/16
003:         *
004:         * Copyright  1990-2006 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:
028:        package IXCDemo.ixcXlets.serverXlet;
029:
030:        import java.util.Vector;
031:        import javax.microedition.xlet.Xlet;
032:        import javax.microedition.xlet.XletContext;
033:        import java.rmi.RemoteException;
034:        import IXCDemo.shared.*;
035:
036:        public class PlaneImpl implements  Plane {
037:            private float speed;
038:            private double heading;
039:            private Position position = new Position(0, 0);
040:            private Vector listeners = new Vector();
041:            private long lastTime;
042:
043:            public float getSpeed() {
044:                return speed;
045:            }
046:
047:            public double getHeading() {
048:                return heading;
049:            }
050:
051:            public Position getPosition() {
052:                return position;
053:            }
054:
055:            public void accelerate(float deltaV) {
056:                System.out.println("PlaneServer accelerates by " + deltaV);
057:                speed += deltaV;
058:                updatePosition();
059:            }
060:
061:            public void turn(double delta) {
062:                System.out.println("PlaneServer turns by " + delta);
063:                heading += delta;
064:                updatePosition();
065:            }
066:
067:            public void addListener(PlaneListener l) {
068:                System.out.println("PlaneImpl gets new listener " + l);
069:                listeners.addElement(l);
070:            }
071:
072:            public void removeListener(PlaneListener l) {
073:                listeners.removeElement(l);
074:            }
075:
076:            void tick() {
077:                updatePosition();
078:                notifyListeners();
079:            }
080:
081:            private void updatePosition() {
082:                synchronized (this ) {
083:                    long next = System.currentTimeMillis();
084:                    long deltaT = next - lastTime;
085:                    float x = position.getX()
086:                            + (float) (speed * Math.sin(heading));
087:                    float y = position.getY()
088:                            + (float) (speed * Math.cos(heading));
089:                    position = new Position(x, y);
090:                    lastTime = next;
091:                }
092:            }
093:
094:            private void notifyListeners() {
095:                PlaneListener[] l;
096:                synchronized (listeners) {
097:                    l = new PlaneListener[listeners.size()];
098:                    for (int i = 0; i < l.length; i++) {
099:                        l[i] = (PlaneListener) listeners.elementAt(i);
100:                    }
101:                }
102:                for (int i = 0; i < l.length; i++) {
103:                    try {
104:                        System.out.println("PlaneImpl notifing listener "
105:                                + l[i]);
106:                        l[i].positionChanged(position);
107:                    } catch (RemoteException ex) {
108:                        ex.printStackTrace();
109:                        System.out
110:                                .println("Remote exception, will remove listener...");
111:                        try {
112:                            Thread.sleep(2000);
113:                        } catch (InterruptedException iex) {
114:                            Thread.currentThread().interrupt();
115:                        }
116:                        System.out.println("Removing listener.");
117:                        removeListener(l[i]);
118:                    }
119:                }
120:            }
121:
122:            public int hashCode() {
123:                long headingBits = Double.doubleToLongBits(heading);
124:                return position.hashCode() ^ Float.floatToIntBits(speed)
125:                        ^ ((int) (headingBits & (headingBits >>> 32)));
126:            }
127:
128:            public boolean equals(Object other) {
129:                if (this  == other) {
130:                    return true;
131:                } else if (!(other instanceof  PlaneImpl)) {
132:                    return false;
133:                } else {
134:                    PlaneImpl po = (PlaneImpl) other;
135:                    return speed == po.speed && heading == po.heading
136:                            && position.equals(po.position);
137:                }
138:            }
139:
140:            public String toString() {
141:                return getClass().getName() + "<speed=" + speed + ", heading="
142:                        + heading + ", position=" + position + ">";
143:            }
144:        }
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