[time] Use IqBuilder pattern and improve API

smack-extensions/src/main/java/org/jivesoftware/smackx/time/EntityTimeManager.java

@@ -21,6 +21,8 @@ import java.util.WeakHashMap;
 
 import org.jivesoftware.smack.ConnectionCreationListener;
 import org.jivesoftware.smack.Manager;
+import org.jivesoftware.smack.SmackException;
+import org.jivesoftware.smack.SmackException.FeatureNotSupportedException;
 import org.jivesoftware.smack.SmackException.NoResponseException;
 import org.jivesoftware.smack.SmackException.NotConnectedException;
 import org.jivesoftware.smack.XMPPConnection;
@@ -75,12 +77,13 @@ public final class EntityTimeManager extends Manager {
                         Mode.async) {
             @Override
             public IQ handleIQRequest(IQ iqRequest) {
-                if (enabled) {
+                if (!enabled) {
-                    return Time.createResponse(iqRequest);
-                }
-                else {
                     return IQ.createErrorResponse(iqRequest, Condition.not_acceptable);
                 }
+
+                Time timeRequest = (Time) iqRequest;
+                Time timeResponse = Time.builder(timeRequest).build();
+                return timeResponse;
             }
         });
     }
@@ -105,13 +108,16 @@ public final class EntityTimeManager extends Manager {
         return ServiceDiscoveryManager.getInstanceFor(connection()).supportsFeature(jid, Time.NAMESPACE);
     }
 
-    public Time getTime(Jid jid) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+    public Time getTime(Jid jid) throws NoResponseException, XMPPErrorException, NotConnectedException,
-        if (!isTimeSupported(jid))
+                    InterruptedException, FeatureNotSupportedException {
-            return null;
+        if (!isTimeSupported(jid)) {
+            throw new SmackException.FeatureNotSupportedException(Time.NAMESPACE);
+        }
 
-        Time request = new Time();
+        XMPPConnection connection = connection();
-        // TODO Add Time(Jid) constructor and use this constructor instead
+        Time request = Time.builder(connection)
-        request.setTo(jid);
+                        .to(jid)
-        return connection().createStanzaCollectorAndSend(request).nextResultOrThrow();
+                        .build();
+        return connection.createStanzaCollectorAndSend(request).nextResultOrThrow();
     }
 }

smack-extensions/src/main/java/org/jivesoftware/smackx/time/packet/Time.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software, 2014 Florian Schmaus
+ * Copyright 2003-2007 Jive Software, 2014-2021 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,7 +21,10 @@ import java.util.Date;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
+import org.jivesoftware.smack.XMPPConnection;
 import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smack.packet.IqData;
+import org.jivesoftware.smack.util.StringUtils;
 
 import org.jxmpp.util.XmppDateTime;
 
@@ -33,31 +36,41 @@ import org.jxmpp.util.XmppDateTime;
  * @see <a href="http://www.xmpp.org/extensions/xep-0202.html">XEP-202</a>
  * @author Florian Schmaus
  */
-public class Time extends IQ {
+public class Time extends IQ implements TimeView {
+
     public static final String NAMESPACE = "urn:xmpp:time";
     public static final String ELEMENT = "time";
 
     private static final Logger LOGGER = Logger.getLogger(Time.class.getName());
 
-    private String utc;
+    private final String utc;
-    private String tzo;
+    private final String tzo;
 
-    public Time() {
+    public Time(TimeBuilder timeBuilder) {
-        super(ELEMENT, NAMESPACE);
+        super(timeBuilder, ELEMENT, NAMESPACE);
-        setType(Type.get);
+        utc = timeBuilder.getUtc();
-    }
+        tzo = timeBuilder.getTzo();
 
-    /**
+        Type type = getType();
-     * Creates a new Time instance using the specified calendar instance as
+        switch (type) {
-     * the time value to send.
+        case get:
-     *
+            if (utc != null) {
-     * @param cal the time value.
+                throw new IllegalArgumentException("Time requests must not have utc set");
-     */
+            }
-    public Time(Calendar cal) {
+            if (tzo != null) {
-        super(ELEMENT, NAMESPACE);
+                throw new IllegalArgumentException("Time requests must not have tzo set");
-        tzo = XmppDateTime.asString(cal.getTimeZone());
+            }
-        // Convert local time to the UTC time.
+            break;
-        utc = XmppDateTime.formatXEP0082Date(cal.getTime());
+        case result:
+            StringUtils.requireNotNullNorEmpty(utc, "Must have set a utc value");
+            StringUtils.requireNotNullNorEmpty(tzo, "Must have set a tzo value");
+            break;
+        case error:
+            // Nothing to check.
+            break;
+        case set:
+            throw new IllegalArgumentException("Invalid IQ type");
+        }
     }
 
     /**
@@ -79,67 +92,47 @@ public class Time extends IQ {
         return date;
     }
 
-    /**
+    @Override
-     * Sets the time using the local time.
-     *
-     * @param time the current local time.
-     */
-    public void setTime(Date time) {
-    }
-
-    /**
-     * Returns the time as a UTC formatted String using the format CCYY-MM-DDThh:mm:ssZ.
-     *
-     * @return the time as a UTC formatted String.
-     */
     public String getUtc() {
         return utc;
     }
 
-    /**
+    @Override
-     * Sets the time using UTC formatted String in the format CCYY-MM-DDThh:mm:ssZ.
-     *
-     * @param utc the time using a formatted String.
-     */
-    public void setUtc(String utc) {
-        this.utc = utc;
-    }
-
-    /**
-     * Returns the time zone.
-     *
-     * @return the time zone.
-     */
     public String getTzo() {
         return tzo;
     }
 
-    /**
-     * Sets the time zone offset.
-     *
-     * @param tzo the time zone offset.
-     */
-    public void setTzo(String tzo) {
-        this.tzo = tzo;
-    }
-
-    public static Time createResponse(IQ request) {
-        Time time = new Time(Calendar.getInstance());
-        time.setType(Type.result);
-        time.setTo(request.getFrom());
-        return time;
-    }
-
     @Override
     protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder buf) {
         if (utc != null) {
             buf.rightAngleBracket();
-            buf.append("<utc>").append(utc).append("</utc>");
+            buf.element("utc", utc);
-            buf.append("<tzo>").append(tzo).append("</tzo>");
+            buf.element("tzo", tzo);
         } else {
             buf.setEmptyElement();
         }
 
         return buf;
     }
+
+    public static TimeBuilder builder(XMPPConnection connection) {
+        return new TimeBuilder(connection);
+    }
+
+    public static TimeBuilder builder(IqData iqData) {
+        return new TimeBuilder(iqData);
+    }
+
+    public static TimeBuilder builder(String stanzaId) {
+        return new TimeBuilder(stanzaId);
+    }
+
+    public static TimeBuilder builder(Time timeRequest, Calendar calendar) {
+        IqData iqData = IqData.createResponseData(timeRequest);
+        return builder(iqData).setTime(calendar);
+    }
+
+    public static TimeBuilder builder(Time timeRequest) {
+        return builder(timeRequest, Calendar.getInstance());
+    }
 }

smack-extensions/src/main/java/org/jivesoftware/smackx/time/packet/TimeBuilder.java

@@ -0,0 +1,94 @@
+/**
+ *
+ * Copyright 2021 Florian Schmaus
+ *
+ * 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.smackx.time.packet;
+
+import java.text.ParseException;
+import java.util.Calendar;
+
+import org.jivesoftware.smack.XMPPConnection;
+import org.jivesoftware.smack.packet.IqBuilder;
+import org.jivesoftware.smack.packet.IqData;
+import org.jivesoftware.smack.util.StringUtils;
+
+import org.jxmpp.util.XmppDateTime;
+
+// TODO: Use java.time.ZonedDataTime once Smack's minimum Android SDK API level is 26 or higher.
+public class TimeBuilder extends IqBuilder<TimeBuilder, Time> implements TimeView {
+
+    private String utc;
+    private String tzo;
+
+    TimeBuilder(IqData iqCommon) {
+        super(iqCommon);
+    }
+
+    TimeBuilder(XMPPConnection connection) {
+        super(connection);
+    }
+
+    TimeBuilder(String stanzaId) {
+        super(stanzaId);
+    }
+
+    /**
+     * Sets the time using UTC formatted String, in the format CCYY-MM-DDThh:mm:ssZ, and the provided timezone
+     * definition in the format (+|-)hh:mm.
+     *
+     * @param utc the time using a formatted String.
+     * @param tzo the time zone definition.
+     * @return a reference to this builder.
+     * @throws ParseException if the provided string is not parsable (e.g. because it does not follow the expected
+     *         format).
+     */
+    public TimeBuilder setUtcAndTzo(String utc, String tzo) throws ParseException {
+        this.utc = StringUtils.requireNotNullNorEmpty(utc, "Must provide utc argument");
+        // Sanity check the provided string.
+        XmppDateTime.parseDate(utc);
+
+        this.tzo = StringUtils.requireNotNullNorEmpty(tzo, "Must provide tzo argument");
+
+        return getThis();
+    }
+
+    public TimeBuilder setTime(Calendar calendar) {
+        // Convert local time to the UTC time.
+        utc = XmppDateTime.formatXEP0082Date(calendar.getTime());
+        tzo = XmppDateTime.asString(calendar.getTimeZone());
+
+        return getThis();
+    }
+
+    @Override
+    public String getUtc() {
+        return utc;
+    }
+
+    @Override
+    public String getTzo() {
+        return tzo;
+    }
+
+    @Override
+    public Time build() {
+        return new Time(this);
+    }
+
+    @Override
+    public TimeBuilder getThis() {
+        return this;
+    }
+}

smack-extensions/src/main/java/org/jivesoftware/smackx/time/packet/TimeView.java

@@ -0,0 +1,37 @@
+/**
+ *
+ * Copyright 2021 Florian Schmaus
+ *
+ * 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.smackx.time.packet;
+
+import org.jivesoftware.smack.packet.IqView;
+
+public interface TimeView extends IqView {
+
+    /**
+     * Returns the time as a UTC formatted String using the format CCYY-MM-DDThh:mm:ssZ.
+     *
+     * @return the time as a UTC formatted String.
+     */
+    String getUtc();
+
+    /**
+     * Returns the time zone.
+     *
+     * @return the time zone.
+     */
+    String getTzo();
+
+}

smack-extensions/src/main/java/org/jivesoftware/smackx/time/provider/TimeProvider.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2014 Florian Schmaus
+ * Copyright © 2014-2021 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,14 +16,55 @@
  */
 package org.jivesoftware.smackx.time.provider;
 
-import org.jivesoftware.smack.provider.IntrospectionProvider.IQIntrospectionProvider;
+import java.io.IOException;
+import java.text.ParseException;
+
+import org.jivesoftware.smack.packet.IqData;
+import org.jivesoftware.smack.packet.XmlEnvironment;
+import org.jivesoftware.smack.provider.IqProvider;
+import org.jivesoftware.smack.xml.XmlPullParser;
+import org.jivesoftware.smack.xml.XmlPullParserException;
 
 import org.jivesoftware.smackx.time.packet.Time;
+import org.jivesoftware.smackx.time.packet.TimeBuilder;
 
-public class TimeProvider extends IQIntrospectionProvider<Time> {
+public class TimeProvider extends IqProvider<Time> {
 
-    public TimeProvider() {
+    @Override
-        super(Time.class);
+    public Time parse(XmlPullParser parser, int initialDepth, IqData iqData, XmlEnvironment xmlEnvironment)
+                    throws XmlPullParserException, IOException, ParseException {
+        String utc = null, tzo = null;
+        TimeBuilder timeBuilder = Time.builder(iqData);
+
+        outerloop: while (true) {
+            XmlPullParser.Event eventType = parser.next();
+            switch (eventType) {
+            case START_ELEMENT:
+                String name = parser.getName();
+                switch (name) {
+                case "utc":
+                    utc = parser.nextText();
+                    break;
+                case "tzo":
+                    tzo = parser.nextText();
+                    break;
+                }
+                break;
+            case END_ELEMENT:
+                if (parser.getDepth() == initialDepth) {
+                    break outerloop;
+                }
+                break;
+            default:
+                break;
+            }
+        }
+
+        if (utc != null) {
+            timeBuilder.setUtcAndTzo(utc, tzo);
+        }
+
+        return timeBuilder.build();
     }
 
 }

smack-extensions/src/test/java/org/jivesoftware/smackx/time/packet/TimeTest.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2014 Florian Schmaus
+ * Copyright 2014-2021 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,6 +22,7 @@ import java.util.Calendar;
 import java.util.Date;
 import java.util.TimeZone;
 
+import org.jivesoftware.smack.packet.IQ;
 import org.jivesoftware.smack.test.util.SmackTestSuite;
 
 import org.junit.jupiter.api.Test;
@@ -31,7 +32,10 @@ public class TimeTest extends SmackTestSuite {
     @Test
     public void parseCurrentTimeTest() {
         Calendar calendar = Calendar.getInstance();
-        Time time = new Time(calendar);
+        Time time = Time.builder("dummy")
+                        .ofType(IQ.Type.result)
+                        .setTime(calendar)
+                        .build();
 
         Date date = time.getTime();
         Date calendarDate = calendar.getTime();
@@ -43,7 +47,10 @@ public class TimeTest extends SmackTestSuite {
     public void negativeTimezoneTest() {
         Calendar calendar = Calendar.getInstance();
         calendar.setTimeZone(TimeZone.getTimeZone("GMT-830"));
-        Time time = new Time(calendar);
+        Time time = Time.builder("dummy")
+                        .ofType(IQ.Type.result)
+                        .setTime(calendar)
+                        .build();
 
         assertEquals("-8:30", time.getTzo());
     }
@@ -52,7 +59,10 @@ public class TimeTest extends SmackTestSuite {
     public void positiveTimezoneTest() {
         Calendar calendar = Calendar.getInstance();
         calendar.setTimeZone(TimeZone.getTimeZone("GMT+830"));
-        Time time = new Time(calendar);
+        Time time = Time.builder("dummy")
+                        .ofType(IQ.Type.result)
+                        .setTime(calendar)
+                        .build();
 
         assertEquals("+8:30", time.getTzo());
     }