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Smack/source/org/jivesoftware/smack/packet/Message.java

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/**
* $RCSfile$
* $Revision$
* $Date$
*
* Copyright 2003-2007 Jive Software.
*
* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smack.packet;
import org.jivesoftware.smack.util.StringUtils;
import java.util.*;
/**
* Represents XMPP message packets. A message can be one of several types:
*
* <ul>
* <li>Message.Type.NORMAL -- (Default) a normal text message used in email like interface.
* <li>Message.Type.CHAT -- a typically short text message used in line-by-line chat interfaces.
* <li>Message.Type.GROUP_CHAT -- a chat message sent to a groupchat server for group chats.
* <li>Message.Type.HEADLINE -- a text message to be displayed in scrolling marquee displays.
* <li>Message.Type.ERROR -- indicates a messaging error.
* </ul>
*
* For each message type, different message fields are typically used as follows:
* <p>
* <table border="1">
* <tr><td>&nbsp;</td><td colspan="5"><b>Message type</b></td></tr>
* <tr><td><i>Field</i></td><td><b>Normal</b></td><td><b>Chat</b></td><td><b>Group Chat</b></td><td><b>Headline</b></td><td><b>XMPPError</b></td></tr>
* <tr><td><i>subject</i></td> <td>SHOULD</td><td>SHOULD NOT</td><td>SHOULD NOT</td><td>SHOULD NOT</td><td>SHOULD NOT</td></tr>
* <tr><td><i>thread</i></td> <td>OPTIONAL</td><td>SHOULD</td><td>OPTIONAL</td><td>OPTIONAL</td><td>SHOULD NOT</td></tr>
* <tr><td><i>body</i></td> <td>SHOULD</td><td>SHOULD</td><td>SHOULD</td><td>SHOULD</td><td>SHOULD NOT</td></tr>
* <tr><td><i>error</i></td> <td>MUST NOT</td><td>MUST NOT</td><td>MUST NOT</td><td>MUST NOT</td><td>MUST</td></tr>
* </table>
*
* @author Matt Tucker
*/
public class Message extends Packet {
private Type type = Type.normal;
private String thread = null;
private String language;
private final Set<Subject> subjects = new HashSet<Subject>();
private final Set<Body> bodies = new HashSet<Body>();
/**
* Creates a new, "normal" message.
*/
public Message() {
}
/**
* Creates a new "normal" message to the specified recipient.
*
* @param to the recipient of the message.
*/
public Message(String to) {
setTo(to);
}
/**
* Creates a new message of the specified type to a recipient.
*
* @param to the user to send the message to.
* @param type the message type.
*/
public Message(String to, Type type) {
setTo(to);
if (type != null) {
this.type = type;
}
}
/**
* Returns the type of the message. If no type has been set this method will return {@link
* org.jivesoftware.smack.packet.Message.Type#normal}.
*
* @return the type of the message.
*/
public Type getType() {
return type;
}
/**
* Sets the type of the message.
*
* @param type the type of the message.
* @throws IllegalArgumentException if null is passed in as the type
*/
public void setType(Type type) {
if (type == null) {
throw new IllegalArgumentException("Type cannot be null.");
}
this.type = type;
}
/**
* Returns the default subject of the message, or null if the subject has not been set.
* The subject is a short description of message contents.
* <p>
* The default subject of a message is the subject that corresponds to the message's language.
* (see {@link #getLanguage()}) or if no language is set to the applications default
* language (see {@link Packet#getDefaultLanguage()}).
*
* @return the subject of the message.
*/
public String getSubject() {
return getSubject(null);
}
/**
* Returns the subject corresponding to the language. If the language is null, the method result
* will be the same as {@link #getSubject()}. Null will be returned if the language does not have
* a corresponding subject.
*
* @param language the language of the subject to return.
* @return the subject related to the passed in language.
*/
public String getSubject(String language) {
Subject subject = getMessageSubject(language);
return subject == null ? null : subject.subject;
}
private Subject getMessageSubject(String language) {
language = determineLanguage(language);
for (Subject subject : subjects) {
if (language.equals(subject.language)) {
return subject;
}
}
return null;
}
/**
* Returns a set of all subjects in this Message, including the default message subject accessible
* from {@link #getSubject()}.
*
* @return a collection of all subjects in this message.
*/
public Collection<Subject> getSubjects() {
return Collections.unmodifiableCollection(subjects);
}
/**
* Sets the subject of the message. The subject is a short description of
* message contents.
*
* @param subject the subject of the message.
*/
public void setSubject(String subject) {
if (subject == null) {
removeSubject(""); // use empty string because #removeSubject(null) is ambiguous
return;
}
addSubject(null, subject);
}
/**
* Adds a subject with a corresponding language.
*
* @param language the language of the subject being added.
* @param subject the subject being added to the message.
* @return the new {@link org.jivesoftware.smack.packet.Message.Subject}
* @throws NullPointerException if the subject is null, a null pointer exception is thrown
*/
public Subject addSubject(String language, String subject) {
language = determineLanguage(language);
Subject messageSubject = new Subject(language, subject);
subjects.add(messageSubject);
return messageSubject;
}
/**
* Removes the subject with the given language from the message.
*
* @param language the language of the subject which is to be removed
* @return true if a subject was removed and false if it was not.
*/
public boolean removeSubject(String language) {
language = determineLanguage(language);
for (Subject subject : subjects) {
if (language.equals(subject.language)) {
return subjects.remove(subject);
}
}
return false;
}
/**
* Removes the subject from the message and returns true if the subject was removed.
*
* @param subject the subject being removed from the message.
* @return true if the subject was successfully removed and false if it was not.
*/
public boolean removeSubject(Subject subject) {
return subjects.remove(subject);
}
/**
* Returns all the languages being used for the subjects, not including the default subject.
*
* @return the languages being used for the subjects.
*/
public Collection<String> getSubjectLanguages() {
Subject defaultSubject = getMessageSubject(null);
List<String> languages = new ArrayList<String>();
for (Subject subject : subjects) {
if (!subject.equals(defaultSubject)) {
languages.add(subject.language);
}
}
return Collections.unmodifiableCollection(languages);
}
/**
* Returns the default body of the message, or null if the body has not been set. The body
* is the main message contents.
* <p>
* The default body of a message is the body that corresponds to the message's language.
* (see {@link #getLanguage()}) or if no language is set to the applications default
* language (see {@link Packet#getDefaultLanguage()}).
*
* @return the body of the message.
*/
public String getBody() {
return getBody(null);
}
/**
* Returns the body corresponding to the language. If the language is null, the method result
* will be the same as {@link #getBody()}. Null will be returned if the language does not have
* a corresponding body.
*
* @param language the language of the body to return.
* @return the body related to the passed in language.
* @since 3.0.2
*/
public String getBody(String language) {
Body body = getMessageBody(language);
return body == null ? null : body.message;
}
private Body getMessageBody(String language) {
language = determineLanguage(language);
for (Body body : bodies) {
if (language.equals(body.language)) {
return body;
}
}
return null;
}
/**
* Returns a set of all bodies in this Message, including the default message body accessible
* from {@link #getBody()}.
*
* @return a collection of all bodies in this Message.
* @since 3.0.2
*/
public Collection<Body> getBodies() {
return Collections.unmodifiableCollection(bodies);
}
/**
* Sets the body of the message. The body is the main message contents.
*
* @param body the body of the message.
*/
public void setBody(String body) {
if (body == null) {
removeBody(""); // use empty string because #removeBody(null) is ambiguous
return;
}
addBody(null, body);
}
/**
* Adds a body with a corresponding language.
*
* @param language the language of the body being added.
* @param body the body being added to the message.
* @return the new {@link org.jivesoftware.smack.packet.Message.Body}
* @throws NullPointerException if the body is null, a null pointer exception is thrown
* @since 3.0.2
*/
public Body addBody(String language, String body) {
language = determineLanguage(language);
Body messageBody = new Body(language, body);
bodies.add(messageBody);
return messageBody;
}
/**
* Removes the body with the given language from the message.
*
* @param language the language of the body which is to be removed
* @return true if a body was removed and false if it was not.
*/
public boolean removeBody(String language) {
language = determineLanguage(language);
for (Body body : bodies) {
if (language.equals(body.language)) {
return bodies.remove(body);
}
}
return false;
}
/**
* Removes the body from the message and returns true if the body was removed.
*
* @param body the body being removed from the message.
* @return true if the body was successfully removed and false if it was not.
* @since 3.0.2
*/
public boolean removeBody(Body body) {
return bodies.remove(body);
}
/**
* Returns all the languages being used for the bodies, not including the default body.
*
* @return the languages being used for the bodies.
* @since 3.0.2
*/
public Collection<String> getBodyLanguages() {
Body defaultBody = getMessageBody(null);
List<String> languages = new ArrayList<String>();
for (Body body : bodies) {
if (!body.equals(defaultBody)) {
languages.add(body.language);
}
}
return Collections.unmodifiableCollection(languages);
}
/**
* Returns the thread id of the message, which is a unique identifier for a sequence
* of "chat" messages. If no thread id is set, <tt>null</tt> will be returned.
*
* @return the thread id of the message, or <tt>null</tt> if it doesn't exist.
*/
public String getThread() {
return thread;
}
/**
* Sets the thread id of the message, which is a unique identifier for a sequence
* of "chat" messages.
*
* @param thread the thread id of the message.
*/
public void setThread(String thread) {
this.thread = thread;
}
/**
* Returns the xml:lang of this Message.
*
* @return the xml:lang of this Message.
* @since 3.0.2
*/
public String getLanguage() {
return language;
}
/**
* Sets the xml:lang of this Message.
*
* @param language the xml:lang of this Message.
* @since 3.0.2
*/
public void setLanguage(String language) {
this.language = language;
}
private String determineLanguage(String language) {
// empty string is passed by #setSubject() and #setBody() and is the same as null
language = "".equals(language) ? null : language;
// if given language is null check if message language is set
if (language == null && this.language != null) {
return this.language;
}
else if (language == null) {
return getDefaultLanguage();
}
else {
return language;
}
}
public String toXML() {
StringBuilder buf = new StringBuilder();
buf.append("<message");
if (getXmlns() != null) {
buf.append(" xmlns=\"").append(getXmlns()).append("\"");
}
if (language != null) {
buf.append(" xml:lang=\"").append(getLanguage()).append("\"");
}
if (getPacketID() != null) {
buf.append(" id=\"").append(getPacketID()).append("\"");
}
if (getTo() != null) {
buf.append(" to=\"").append(StringUtils.escapeForXML(getTo())).append("\"");
}
if (getFrom() != null) {
buf.append(" from=\"").append(StringUtils.escapeForXML(getFrom())).append("\"");
}
if (type != Type.normal) {
buf.append(" type=\"").append(type).append("\"");
}
buf.append(">");
// Add the subject in the default language
Subject defaultSubject = getMessageSubject(null);
if (defaultSubject != null) {
buf.append("<subject>").append(StringUtils.escapeForXML(defaultSubject.subject)).append("</subject>");
}
// Add the subject in other languages
for (Subject subject : getSubjects()) {
// Skip the default language
if(subject.equals(defaultSubject))
continue;
buf.append("<subject xml:lang=\"").append(subject.language).append("\">");
buf.append(StringUtils.escapeForXML(subject.subject));
buf.append("</subject>");
}
// Add the body in the default language
Body defaultBody = getMessageBody(null);
if (defaultBody != null) {
buf.append("<body>").append(StringUtils.escapeForXML(defaultBody.message)).append("</body>");
}
// Add the bodies in other languages
for (Body body : getBodies()) {
// Skip the default language
if(body.equals(defaultBody))
continue;
buf.append("<body xml:lang=\"").append(body.getLanguage()).append("\">");
buf.append(StringUtils.escapeForXML(body.getMessage()));
buf.append("</body>");
}
if (thread != null) {
buf.append("<thread>").append(thread).append("</thread>");
}
// Append the error subpacket if the message type is an error.
if (type == Type.error) {
XMPPError error = getError();
if (error != null) {
buf.append(error.toXML());
}
}
// Add packet extensions, if any are defined.
buf.append(getExtensionsXML());
buf.append("</message>");
return buf.toString();
}
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Message message = (Message) o;
if(!super.equals(message)) { return false; }
if (bodies.size() != message.bodies.size() || !bodies.containsAll(message.bodies)) {
return false;
}
if (language != null ? !language.equals(message.language) : message.language != null) {
return false;
}
if (subjects.size() != message.subjects.size() || !subjects.containsAll(message.subjects)) {
return false;
}
if (thread != null ? !thread.equals(message.thread) : message.thread != null) {
return false;
}
return type == message.type;
}
public int hashCode() {
int result;
result = (type != null ? type.hashCode() : 0);
result = 31 * result + subjects.hashCode();
result = 31 * result + (thread != null ? thread.hashCode() : 0);
result = 31 * result + (language != null ? language.hashCode() : 0);
result = 31 * result + bodies.hashCode();
return result;
}
/**
* Represents a message subject, its language and the content of the subject.
*/
public static class Subject {
private String subject;
private String language;
private Subject(String language, String subject) {
if (language == null) {
throw new NullPointerException("Language cannot be null.");
}
if (subject == null) {
throw new NullPointerException("Subject cannot be null.");
}
this.language = language;
this.subject = subject;
}
/**
* Returns the language of this message subject.
*
* @return the language of this message subject.
*/
public String getLanguage() {
return language;
}
/**
* Returns the subject content.
*
* @return the content of the subject.
*/
public String getSubject() {
return subject;
}
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + this.language.hashCode();
result = prime * result + this.subject.hashCode();
return result;
}
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
Subject other = (Subject) obj;
// simplified comparison because language and subject are always set
return this.language.equals(other.language) && this.subject.equals(other.subject);
}
}
/**
* Represents a message body, its language and the content of the message.
*/
public static class Body {
private String message;
private String language;
private Body(String language, String message) {
if (language == null) {
throw new NullPointerException("Language cannot be null.");
}
if (message == null) {
throw new NullPointerException("Message cannot be null.");
}
this.language = language;
this.message = message;
}
/**
* Returns the language of this message body.
*
* @return the language of this message body.
*/
public String getLanguage() {
return language;
}
/**
* Returns the message content.
*
* @return the content of the message.
*/
public String getMessage() {
return message;
}
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + this.language.hashCode();
result = prime * result + this.message.hashCode();
return result;
}
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
Body other = (Body) obj;
// simplified comparison because language and message are always set
return this.language.equals(other.language) && this.message.equals(other.message);
}
}
/**
* Represents the type of a message.
*/
public enum Type {
/**
* (Default) a normal text message used in email like interface.
*/
normal,
/**
* Typically short text message used in line-by-line chat interfaces.
*/
chat,
/**
* Chat message sent to a groupchat server for group chats.
*/
groupchat,
/**
* Text message to be displayed in scrolling marquee displays.
*/
headline,
/**
* indicates a messaging error.
*/
error;
public static Type fromString(String name) {
try {
return Type.valueOf(name);
}
catch (Exception e) {
return normal;
}
}
}
}
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