Source Code Cross Referenced for LinkMessage.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » links » 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.links 
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.links;
028:
029:        /**
030:         * Encapsulates some data to be sent between Isolates through a Link.
031:         */
032:        public class LinkMessage {
033:
034:            // IMPL_NOTE: force classloading of byte[] so that
035:            // KNI_FindClass() will always find it.
036:            static {
037:                try {
038:                    Class.forName("[B");
039:                } catch (ClassNotFoundException ignore) {
040:                }
041:            }
042:
043:            Object contents;
044:
045:            // used only for data (byte-array) messages, otherwise zeroes
046:            int offset; // = 0
047:            int length; // = 0
048:
049:            /**
050:             * Constructs a LinkMessage with the given contents, length, and offset 
051:             * values. Called only by the static factory methods.
052:             */
053:            private LinkMessage(Object newContents, int newOffset, int newLength) {
054:                contents = newContents;
055:                offset = newOffset;
056:                length = newLength;
057:            }
058:
059:            /**
060:             * Constructs an empty LinkMessage. This is used only by Link.receive().
061:             */
062:            LinkMessage() {
063:                this (null, 0, 0);
064:            }
065:
066:            /**
067:             * Queries whether the LinkMessage contains data, that is, a byte array.
068:             */
069:            public boolean containsData() {
070:                return contents instanceof  byte[];
071:            }
072:
073:            /**
074:             * Queries whether the LinkMessage contains a Link.
075:             */
076:            public boolean containsLink() {
077:                return contents instanceof  Link;
078:            }
079:
080:            /**
081:             * Queries whether the LinkMessage contains a String.
082:             */
083:            public boolean containsString() {
084:                return contents instanceof  String;
085:            }
086:
087:            /**
088:             * Returns the contents of the LinkMessage as an Object. The caller must 
089:             * test the reference returned using <code>instanceof</code> and cast it 
090:             * appropriately.
091:             */
092:            public Object extract() {
093:                return contents;
094:            }
095:
096:            /**
097:             * Returns the contents of the LinkMessage if it contains a byte array. If
098:             * the message does not contain a byte array, throws IllegalStateException.
099:             */
100:            public byte[] extractData() {
101:                if (!(contents instanceof  byte[])) {
102:                    throw new IllegalStateException();
103:                }
104:
105:                byte[] data = (byte[]) contents;
106:
107:                if (offset == 0 && length == data.length) {
108:                    return data;
109:                }
110:
111:                // need to copy the subrange
112:
113:                byte[] newData = new byte[length];
114:                System.arraycopy(data, offset, newData, 0, length);
115:                return newData;
116:            }
117:
118:            /**
119:             * Returns the contents of the LinkMessage if it contains is a Link. If 
120:             * the message does not contain a Link, throws IllegalStateException.
121:             */
122:            public Link extractLink() {
123:                if (contents instanceof  Link) {
124:                    return (Link) contents;
125:                } else {
126:                    throw new IllegalStateException();
127:                }
128:            }
129:
130:            /**
131:             * Returns the contents of the LinkMessage if it contains is a String. If 
132:             * the message does not contain a String, throws IllegalStateException.
133:             */
134:            public String extractString() {
135:                if (contents instanceof  String) {
136:                    return (String) contents;
137:                } else {
138:                    throw new IllegalStateException();
139:                }
140:            }
141:
142:            public static LinkMessage newDataMessage(byte[] data) {
143:                return new LinkMessage(data, 0, data.length);
144:            }
145:
146:            public static LinkMessage newDataMessage(byte[] data, int offset,
147:                    int length) {
148:                if (offset < 0 || offset > data.length || length < 0
149:                        || offset + length < 0 || offset + length > data.length) {
150:                    throw new IndexOutOfBoundsException();
151:                }
152:
153:                return new LinkMessage(data, offset, length);
154:            }
155:
156:            public static LinkMessage newLinkMessage(Link link) {
157:                return new LinkMessage(link, 0, 0);
158:            }
159:
160:            public static LinkMessage newStringMessage(String string) {
161:                return new LinkMessage(string, 0, 0);
162:            }
163:
164:        }
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