Source Code Cross Referenced for Message.java in  » 6.0-JDK-Modules » j2me » javax » wireless » messaging » 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.wireless.messaging 
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.wireless.messaging;
028:
029:        /**
030:         * This is the base interface for derived interfaces
031:         * that represent various types of messages. This package is
032:         * designed to work with <code>Message</code> objects that
033:         * may contain different elements depending on the underlying
034:         * messaging protocol. This is different from <code>Datagram</code>s that
035:         * are assumed always to be just blocks of binary data.
036:         * An adapter specification for a given messaging protocol
037:         * may define further interfaces derived from the <code>Message</code>
038:         * interfaces included in this generic specification.
039:         *
040:         * <p>
041:         * The wireless messaging protocols that are accessed
042:         * via this API are typically of store-and-forward nature,
043:         * unlike network layer datagrams. Thus, the messages will
044:         * usually reach the recipient, even if the recipient is not
045:         * connected at the time of sending the message. This may
046:         * happen significantly later if the recipient is
047:         * disconnected for a long time. Sending, and possibly also
048:         * receiving, these wireless messages typically involves
049:         * a financial cost to the end user that cannot be neglected. Therefore,
050:         * applications should not send many messages unnecessarily.
051:         * </p>
052:         * <p>This interface contains the functionality common
053:         * to all messages. Concrete object instances representing
054:         * a message will typically implement other (sub)interfaces
055:         * providing access to the content and other information in
056:         * the message which is dependent on the type of the message.
057:         * </p>
058:         * <p>Object instances implementing this interface are just
059:         * containers for the data that is passed in. The <code>setAddress()</code>
060:         * method just sets the value of the address in the
061:         * data container without any checking whether the value
062:         * is valid in any way.
063:         * </p>
064:         */
065:
066:        public interface Message {
067:
068:            /**
069:             * Returns the address associated with this message.
070:             *
071:             * <p>If this is a message to be sent, then this address
072:             * is the recipient's address.
073:             * </p>
074:             * <p>If this is a message that has been received, then
075:             * this address is the sender's address.
076:             * </p>
077:             * <p>Returns <code>null</code>, if the address for the message
078:             * is not set.
079:             * </p>
080:             * <p><strong>Note</strong>: This design allows responses to be
081:             * sent to a received message by reusing the
082:             * same <code>Message</code> object and just replacing the
083:             * payload. The address field can normally be
084:             * kept untouched (unless the messaging protocol
085:             * requires some special handling of the address).
086:             * </p>
087:             * <p>The returned address uses the same URL string 
088:             * syntax that <code>Connector.open()</code> uses to 
089:             * obtain this <code>MessageConnection</code>.</p>
090:             * @return the address of this message, or <code>null</code>
091:             * if the address is not set
092:             * @see #setAddress(String)
093:             */
094:            public String getAddress();
095:
096:            /**
097:             * Sets the address associated with this message,
098:             * that is, the address returned by the <code>getAddress</code> method.
099:             * The address may be set to <code>null</code>.
100:             * <p> The address MUST use the same URL string 
101:             * syntax that <code>Connector.open()</code> uses to obtain 
102:             * this <code>MessageConnection</code>. </p>
103:             * @param addr address for the message
104:             * @see #getAddress()
105:             */
106:            public void setAddress(String addr);
107:
108:            /**
109:             * Returns the timestamp indicating when this message has been
110:             * sent.
111:             * @return <code>Date</code> indicating the timestamp in the message or
112:             *         <code>null</code> if the timestamp is not set or
113:             *         if the time information is not available in the underlying
114:             *         protocol message
115:             */
116:            public java.util.Date getTimestamp();
117:
118:        }
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