Message.java
/**
*
* Copyright 2003-2007 Jive Software.
*
* 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 java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import org.jivesoftware.smack.util.Objects;
import org.jivesoftware.smack.util.TypedCloneable;
import org.jivesoftware.smack.util.XmlStringBuilder;
import org.jxmpp.jid.Jid;
import org.jxmpp.jid.impl.JidCreate;
import org.jxmpp.stringprep.XmppStringprepException;
/**
* 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">
* <caption>Message Types</caption>
* <tr><td> </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 final class Message extends Stanza implements TypedCloneable<Message> {
public static final String ELEMENT = "message";
public static final String BODY = "body";
private Type type;
private String thread = null;
private final Set<Subject> subjects = new HashSet<Subject>();
/**
* 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(Jid 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(Jid to, Type type) {
this(to);
setType(type);
}
/**
* Creates a new message to the specified recipient and with the specified body.
*
* @param to the user to send the message to.
* @param body the body of the message.
*/
public Message(Jid to, String body) {
this(to);
setBody(body);
}
/**
* Creates a new message to the specified recipient and with the specified body.
*
* @param to the user to send the message to.
* @param body the body of the message.
* @throws XmppStringprepException if 'to' is not a valid XMPP address.
*/
public Message(String to, String body) throws XmppStringprepException {
this(JidCreate.from(to), body);
}
/**
* Creates a new message with the specified recipient and extension element.
*
* @param to
* @param extensionElement
* @since 4.2
*/
public Message(Jid to, ExtensionElement extensionElement) {
this(to);
addExtension(extensionElement);
}
/**
* Copy constructor.
* <p>
* This does not perform a deep clone, as extension elements are shared between the new and old
* instance.
* </p>
*
* @param other
*/
public Message(Message other) {
super(other);
this.type = other.type;
this.thread = other.thread;
this.subjects.addAll(other.subjects);
}
/**
* 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() {
if (type == null) {
return Type.normal;
}
return type;
}
/**
* Sets the type of the message.
*
* @param type the type of the message.
*/
public void setType(Type type) {
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 Stanza#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 (Objects.equals(language, 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 Set<Subject> getSubjects() {
return Collections.unmodifiableSet(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 List<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.unmodifiableList(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 Stanza#getDefaultLanguage()}).
*
* @return the body of the message.
*/
public String getBody() {
return getBody(language);
}
/**
* 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 : getBodies()) {
if (Objects.equals(language, body.language) || (language != null && language.equals(this.language) && body.language == null)) {
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 Set<Body> getBodies() {
List<ExtensionElement> bodiesList = getExtensions(Body.ELEMENT, Body.NAMESPACE);
Set<Body> resultSet = new HashSet<>(bodiesList.size());
for (ExtensionElement extensionElement : bodiesList) {
Body body = (Body) extensionElement;
resultSet.add(body);
}
return resultSet;
}
/**
* Sets the body of the message.
*
* @param body the body of the message.
* @see #setBody(String)
* @since 4.2
*/
public void setBody(CharSequence body) {
String bodyString;
if (body != null) {
bodyString = body.toString();
} else {
bodyString = null;
}
setBody(bodyString);
}
/**
* 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);
removeBody(language);
Body messageBody = new Body(language, body);
addExtension(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 : getBodies()) {
String bodyLanguage = body.getLanguage();
if (Objects.equals(bodyLanguage, language)) {
removeExtension(body);
return true;
}
}
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) {
ExtensionElement removedElement = removeExtension(body);
return removedElement != null;
}
/**
* 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 List<String> getBodyLanguages() {
Body defaultBody = getMessageBody(null);
List<String> languages = new ArrayList<String>();
for (Body body : getBodies()) {
if (!body.equals(defaultBody)) {
languages.add(body.language);
}
}
return Collections.unmodifiableList(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;
}
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;
}
return language;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Message Stanza [");
logCommonAttributes(sb);
if (type != null) {
sb.append("type=").append(type).append(',');
}
sb.append(']');
return sb.toString();
}
@Override
public XmlStringBuilder toXML(String enclosingNamespace) {
XmlStringBuilder buf = new XmlStringBuilder(enclosingNamespace);
buf.halfOpenElement(ELEMENT);
enclosingNamespace = addCommonAttributes(buf, enclosingNamespace);
buf.optAttribute("type", type);
buf.rightAngleBracket();
// Add the subject in the default language
Subject defaultSubject = getMessageSubject(null);
if (defaultSubject != null) {
buf.element("subject", defaultSubject.subject);
}
// Add the subject in other languages
for (Subject subject : getSubjects()) {
// Skip the default language
if (subject.equals(defaultSubject))
continue;
buf.append(subject.toXML(null));
}
buf.optElement("thread", thread);
// Append the error subpacket if the message type is an error.
if (type == Type.error) {
appendErrorIfExists(buf, enclosingNamespace);
}
// Add extension elements, if any are defined.
buf.append(getExtensions(), enclosingNamespace);
buf.closeElement(ELEMENT);
return buf;
}
/**
* Creates and returns a copy of this message stanza.
* <p>
* This does not perform a deep clone, as extension elements are shared between the new and old
* instance.
* </p>
* @return a clone of this message.
*/
@Override
public Message clone() {
return new Message(this);
}
/**
* Represents a message subject, its language and the content of the subject.
*/
public static final class Subject implements ExtensionElement {
public static final String ELEMENT = "subject";
public static final String NAMESPACE = StreamOpen.CLIENT_NAMESPACE;
private final String subject;
private final String language;
private Subject(String language, String subject) {
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;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
if (language != null) {
result = prime * result + this.language.hashCode();
}
result = prime * result + this.subject.hashCode();
return result;
}
@Override
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);
}
@Override
public String getElementName() {
return ELEMENT;
}
@Override
public String getNamespace() {
return NAMESPACE;
}
@Override
public XmlStringBuilder toXML(String enclosingNamespace) {
XmlStringBuilder xml = new XmlStringBuilder();
xml.halfOpenElement(getElementName()).optXmlLangAttribute(getLanguage()).rightAngleBracket();
xml.escape(subject);
xml.closeElement(getElementName());
return xml;
}
}
/**
* Represents a message body, its language and the content of the message.
*/
public static final class Body implements ExtensionElement {
public static final String ELEMENT = "body";
public static final String NAMESPACE = StreamOpen.CLIENT_NAMESPACE;
enum BodyElementNamespace {
client(StreamOpen.CLIENT_NAMESPACE),
server(StreamOpen.SERVER_NAMESPACE),
;
private final String xmlNamespace;
BodyElementNamespace(String xmlNamespace) {
this.xmlNamespace = xmlNamespace;
}
public String getNamespace() {
return xmlNamespace;
}
}
private final String message;
private final String language;
private final BodyElementNamespace namespace;
public Body(String language, String message) {
this(language, message, BodyElementNamespace.client);
}
public Body(String language, String message, BodyElementNamespace namespace) {
if (message == null) {
throw new NullPointerException("Message cannot be null.");
}
this.language = language;
this.message = message;
this.namespace = Objects.requireNonNull(namespace);
}
/**
* Returns the language of this message body or {@code null} if the body extension element does not explicitly
* set a language, but instead inherits it from the outer element (usually a {@link Message} stanza).
*
* @return the language of this message body or {@code null}.
*/
public String getLanguage() {
return language;
}
/**
* Returns the message content.
*
* @return the content of the message.
*/
public String getMessage() {
return message;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
if (language != null) {
result = prime * result + this.language.hashCode();
}
result = prime * result + this.message.hashCode();
return result;
}
@Override
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 Objects.equals(this.language, other.language) && this.message.equals(other.message);
}
@Override
public String getElementName() {
return ELEMENT;
}
@Override
public String getNamespace() {
return namespace.xmlNamespace;
}
@Override
public XmlStringBuilder toXML(String enclosingNamespace) {
XmlStringBuilder xml = new XmlStringBuilder(this, enclosingNamespace);
xml.optXmlLangAttribute(getLanguage()).rightAngleBracket();
xml.escape(message);
xml.closeElement(getElementName());
return xml;
}
}
/**
* 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;
/**
* Converts a String into the corresponding types. Valid String values that can be converted
* to types are: "normal", "chat", "groupchat", "headline" and "error".
*
* @param string the String value to covert.
* @return the corresponding Type.
* @throws IllegalArgumentException when not able to parse the string parameter
* @throws NullPointerException if the string is null
*/
public static Type fromString(String string) {
return Type.valueOf(string.toLowerCase(Locale.US));
}
}
}