001/**
002 *
003 * Copyright 2003-2007 Jive Software, 2019-2020 Florian Schmaus
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smack.packet;
018
019import java.util.ArrayList;
020import java.util.Collections;
021import java.util.HashSet;
022import java.util.List;
023import java.util.Set;
024
025import org.jivesoftware.smack.packet.Message.Subject;
026import org.jivesoftware.smack.util.Objects;
027
028public interface MessageView extends StanzaView {
029
030    /**
031     * Returns the type of the message. If no type has been set this method will return {@link
032     * org.jivesoftware.smack.packet.Message.Type#normal}.
033     *
034     * @return the type of the message.
035     */
036    Message.Type getType();
037
038    /**
039     * Returns the default subject of the message, or null if the subject has not been set.
040     * The subject is a short description of message contents.
041     * <p>
042     * The default subject of a message is the subject that corresponds to the message's language.
043     * (see {@link #getLanguage()}) or if no language is set to the applications default
044     * language (see {@link Stanza#getDefaultLanguage()}).
045     *
046     * @return the subject of the message.
047     */
048    default String getSubject() {
049        return getSubject(null);
050    }
051
052    /**
053     * Returns the subject corresponding to the language. If the language is null, the method result
054     * will be the same as {@link #getSubject()}. Null will be returned if the language does not have
055     * a corresponding subject.
056     *
057     * @param language the language of the subject to return.
058     * @return the subject related to the passed in language.
059     */
060    default String getSubject(String language) {
061        Subject subject = getMessageSubject(language);
062        return subject == null ? null : subject.getSubject();
063    }
064
065    default Message.Subject getMessageSubject(String language) {
066        language = Stanza.determineLanguage(this, language);
067        for (Message.Subject subject : getSubjects()) {
068            if (Objects.equals(language, subject.getLanguage())
069                            || (subject.getLanguage() == null && Objects.equals(getLanguage(), language))) {
070                return subject;
071            }
072        }
073        return null;
074    }
075
076    /**
077     * Returns a set of all subjects in this Message, including the default message subject accessible
078     * from {@link #getSubject()}.
079     *
080     * @return a collection of all subjects in this message.
081     */
082    default Set<Message.Subject> getSubjects() {
083        List<Message.Subject> subjectList = getExtensions(Subject.class);
084
085        Set<Message.Subject> subjects = new HashSet<>(subjectList.size());
086        subjects.addAll(subjectList);
087
088        return subjects;
089    }
090
091    /**
092     * Returns all the languages being used for the subjects, not including the default subject.
093     *
094     * @return the languages being used for the subjects.
095     */
096    default List<String> getSubjectLanguages() {
097        Message.Subject defaultSubject = getMessageSubject(null);
098        List<String> languages = new ArrayList<String>();
099        for (Message.Subject subject : getExtensions(Message.Subject.class)) {
100            if (!subject.equals(defaultSubject)) {
101                languages.add(subject.getLanguage());
102            }
103        }
104        return Collections.unmodifiableList(languages);
105    }
106
107    /**
108     * Returns the default body of the message, or null if the body has not been set. The body
109     * is the main message contents.
110     * <p>
111     * The default body of a message is the body that corresponds to the message's language.
112     * (see {@link #getLanguage()}) or if no language is set to the applications default
113     * language (see {@link Stanza#getDefaultLanguage()}).
114     *
115     * @return the body of the message.
116     */
117    default String getBody() {
118        return getBody(getLanguage());
119    }
120
121    /**
122     * Returns the body corresponding to the language. If the language is null, the method result
123     * will be the same as {@link #getBody()}. Null will be returned if the language does not have
124     * a corresponding body.
125     *
126     * @param language the language of the body to return.
127     * @return the body related to the passed in language.
128     * @since 3.0.2
129     */
130    default String getBody(String language) {
131        Message.Body body = getMessageBody(language);
132        return body == null ? null : body.getMessage();
133    }
134
135    default Message.Body getMessageBody(String language) {
136        language = Stanza.determineLanguage(this, language);
137        for (Message.Body body : getBodies()) {
138            if (Objects.equals(language, body.getLanguage()) || (language != null && language.equals(getLanguage()) && body.getLanguage() == null)) {
139                return body;
140            }
141        }
142        return null;
143    }
144
145    /**
146     * Returns a set of all bodies in this Message, including the default message body accessible
147     * from {@link #getBody()}.
148     *
149     * @return a collection of all bodies in this Message.
150     * @since 3.0.2
151     */
152    default Set<Message.Body> getBodies() {
153        List<ExtensionElement> bodiesList = getExtensions(Message.Body.QNAME);
154        Set<Message.Body> resultSet = new HashSet<>(bodiesList.size());
155        for (ExtensionElement extensionElement : bodiesList) {
156            Message.Body body = (Message.Body) extensionElement;
157            resultSet.add(body);
158        }
159        return resultSet;
160    }
161
162    /**
163     * Returns all the languages being used for the bodies, not including the default body.
164     *
165     * @return the languages being used for the bodies.
166     * @since 3.0.2
167     */
168    default List<String> getBodyLanguages() {
169        Message.Body defaultBody = getMessageBody(null);
170        List<String> languages = new ArrayList<String>();
171        for (Message.Body body : getBodies()) {
172            if (!body.equals(defaultBody)) {
173                languages.add(body.getLanguage());
174            }
175        }
176        return Collections.unmodifiableList(languages);
177    }
178
179    /**
180     * Returns the thread id of the message, which is a unique identifier for a sequence
181     * of "chat" messages. If no thread id is set, <code>null</code> will be returned.
182     *
183     * @return the thread id of the message, or <code>null</code> if it doesn't exist.
184     */
185    default String getThread() {
186        Message.Thread thread = getExtension(Message.Thread.class);
187        if (thread == null) {
188            return null;
189        }
190        return thread.getThread();
191    }
192}