offer alternative access to elements and children

instead of Element.findChild(name, namespace) we can now use
Element.getExtension(Extension.class) for registered extensions

build.gradle

@@ -55,6 +55,8 @@ dependencies {
 
     implementation "androidx.security:security-crypto:1.0.0"
 
+    testImplementation 'junit:junit:4.13.2'
+    testImplementation 'org.robolectric:robolectric:4.9'
 
 
     // legacy dependencies. Ideally everything below should be carefully reviewed and eventually moved up
@@ -137,6 +139,12 @@ android {
 
     }
 
+    testOptions {
+        unitTests {
+            includeAndroidResources = false
+        }
+    }
+
     splits {
         abi {
             universalApk true

schemas/im.conversations.android.database.ConversationsDatabase/1.json

@@ -2,7 +2,7 @@
   "formatVersion": 1,
   "database": {
     "version": 1,
-    "identityHash": "4a70ff0733436f5a2a08e7abb8e6cc95",
+    "identityHash": "d16845c3eb73e5fdbc9902903b74428a",
     "entities": [
       {
         "tableName": "account",
@@ -590,7 +590,7 @@
       },
       {
         "tableName": "message",
-        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT, `chatId` INTEGER NOT NULL, `receivedAt` INTEGER, `sentAt` INTEGER, `bareTo` TEXT, `toResource` TEXT, `bareFrom` TEXT, `fromResource` TEXT, `occupantId` TEXT, `messageId` TEXT, `stanzaId` TEXT, FOREIGN KEY(`chatId`) REFERENCES `chat`(`id`) ON UPDATE NO ACTION ON DELETE CASCADE )",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT, `chatId` INTEGER NOT NULL, `receivedAt` INTEGER, `sentAt` INTEGER, `bareTo` TEXT, `toResource` TEXT, `bareFrom` TEXT, `fromResource` TEXT, `occupantId` TEXT, `messageId` TEXT, `stanzaId` TEXT, `acknowledged` INTEGER NOT NULL, FOREIGN KEY(`chatId`) REFERENCES `chat`(`id`) ON UPDATE NO ACTION ON DELETE CASCADE )",
         "fields": [
           {
             "fieldPath": "id",
@@ -657,6 +657,12 @@
             "columnName": "stanzaId",
             "affinity": "TEXT",
             "notNull": false
+          },
+          {
+            "fieldPath": "acknowledged",
+            "columnName": "acknowledged",
+            "affinity": "INTEGER",
+            "notNull": true
           }
         ],
         "primaryKey": {
@@ -1189,7 +1195,7 @@
     "views": [],
     "setupQueries": [
       "CREATE TABLE IF NOT EXISTS room_master_table (id INTEGER PRIMARY KEY,identity_hash TEXT)",
-      "INSERT OR REPLACE INTO room_master_table (id,identity_hash) VALUES(42, '4a70ff0733436f5a2a08e7abb8e6cc95')"
+      "INSERT OR REPLACE INTO room_master_table (id,identity_hash) VALUES(42, 'd16845c3eb73e5fdbc9902903b74428a')"
     ]
   }
 }

src/main/java/eu/siacs/conversations/xml/Element.java

@@ -1,18 +1,19 @@
 package eu.siacs.conversations.xml;
 
 import com.google.common.base.Optional;
+import com.google.common.collect.Collections2;
+import com.google.common.collect.Iterables;
 import com.google.common.primitives.Ints;
-
-import org.jetbrains.annotations.NotNull;
-
-import java.util.ArrayList;
-import java.util.Hashtable;
-import java.util.List;
-
 import eu.siacs.conversations.utils.XmlHelper;
 import eu.siacs.conversations.xmpp.InvalidJid;
 import eu.siacs.conversations.xmpp.Jid;
 import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
+import im.conversations.android.xmpp.model.Extension;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Hashtable;
+import java.util.List;
+import org.jetbrains.annotations.NotNull;
 
 public class Element {
     private final String name;
@@ -65,6 +66,19 @@ public class Element {
         return null;
     }
 
+    public <E extends Extension> E getExtension(final Class<E> clazz) {
+        final var extension = Iterables.find(this.children, clazz::isInstance);
+        if (extension == null) {
+            return null;
+        }
+        return clazz.cast(extension);
+    }
+
+    public <E extends Extension> Collection<E> getExtensions(final Class<E> clazz) {
+        return Collections2.transform(
+                Collections2.filter(this.children, clazz::isInstance), clazz::cast);
+    }
+
     public String findChildContent(String name) {
         Element element = findChild(name);
         return element == null ? null : element.getContent();

src/main/java/eu/siacs/conversations/xml/XmlReader.java

@@ -2,16 +2,14 @@ package eu.siacs.conversations.xml;
 
 import android.util.Log;
 import android.util.Xml;
-
+import eu.siacs.conversations.Config;
-import org.xmlpull.v1.XmlPullParser;
+import im.conversations.android.xmpp.Extensions;
-import org.xmlpull.v1.XmlPullParserException;
-
 import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
-
+import org.xmlpull.v1.XmlPullParser;
-import eu.siacs.conversations.Config;
+import org.xmlpull.v1.XmlPullParserException;
 
 public class XmlReader implements Closeable {
     private final XmlPullParser parser;
@@ -82,13 +80,22 @@ public class XmlReader implements Closeable {
             }
 
         } catch (Throwable throwable) {
-			throw new IOException("xml parser mishandled "+throwable.getClass().getSimpleName()+"("+throwable.getMessage()+")", throwable);
+            throw new IOException(
+                    "xml parser mishandled "
+                            + throwable.getClass().getSimpleName()
+                            + "("
+                            + throwable.getMessage()
+                            + ")",
+                    throwable);
         }
         return null;
     }
 
     public Element readElement(Tag currentTag) throws IOException {
-		Element element = new Element(currentTag.getName());
+        final var attributes = currentTag.getAttributes();
+        final var namespace = attributes.get("xmlns");
+        final var name = currentTag.getName();
+        final Element element = Extensions.create(name, namespace);
         element.setAttributes(currentTag.getAttributes());
         Tag nextTag = this.readTag();
         if (nextTag == null) {

src/main/java/im/conversations/android/annotation/XmlElement.java

@@ -0,0 +1,15 @@
+package im.conversations.android.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE})
+public @interface XmlElement {
+
+    String name() default "";
+
+    String namespace() default "";
+}

src/main/java/im/conversations/android/annotation/XmlPackage.java

@@ -0,0 +1,12 @@
+package im.conversations.android.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.PACKAGE)
+public @interface XmlPackage {
+    String namespace();
+}

src/main/java/im/conversations/android/xmpp/Extensions.java

@@ -0,0 +1,114 @@
+package im.conversations.android.xmpp;
+
+import com.google.common.base.Objects;
+import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableMap;
+import eu.siacs.conversations.xml.Element;
+import im.conversations.android.annotation.XmlElement;
+import im.conversations.android.annotation.XmlPackage;
+import im.conversations.android.xmpp.model.Extension;
+import im.conversations.android.xmpp.model.roster.Item;
+import im.conversations.android.xmpp.model.roster.Query;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
+public final class Extensions {
+
+    private static final List<Class<? extends Extension>> ELEMENTS =
+            Arrays.asList(Query.class, Item.class);
+
+    private static final Map<Id, Class<? extends Extension>> EXTENSION_CLASS_MAP;
+
+    static {
+        final var builder = new ImmutableMap.Builder<Id, Class<? extends Extension>>();
+        for (final Class<? extends Extension> clazz : ELEMENTS) {
+            builder.put(id(clazz), clazz);
+        }
+        EXTENSION_CLASS_MAP = builder.build();
+    }
+
+    private static Id id(final Class<? extends Extension> clazz) {
+        final XmlElement xmlElement = clazz.getAnnotation(XmlElement.class);
+        final Package clazzPackage = clazz.getPackage();
+        final XmlPackage xmlPackage =
+                clazzPackage == null ? null : clazzPackage.getAnnotation(XmlPackage.class);
+        if (xmlElement == null) {
+            throw new IllegalStateException(
+                    String.format("%s is not annotated as @XmlElement", clazz.getName()));
+        }
+        final String packageNamespace = xmlPackage == null ? null : xmlPackage.namespace();
+        final String elementName = xmlElement.name();
+        final String elementNamespace = xmlElement.namespace();
+        final String namespace;
+        if (!Strings.isNullOrEmpty(elementNamespace)) {
+            namespace = elementNamespace;
+        } else if (!Strings.isNullOrEmpty(packageNamespace)) {
+            namespace = packageNamespace;
+        } else {
+            throw new IllegalStateException(
+                    String.format("%s does not declare a namespace", clazz.getName()));
+        }
+        final String name;
+        if (Strings.isNullOrEmpty(elementName)) {
+            name = clazz.getSimpleName().toLowerCase(Locale.ROOT);
+        } else {
+            name = elementName;
+        }
+        return new Id(name, namespace);
+    }
+
+    public static Element create(final String name, final String namespace) {
+        final Class<? extends Element> clazz = of(name, namespace);
+        if (clazz == null) {
+            return new Element(name, namespace);
+        }
+        final Constructor<? extends Element> constructor;
+        try {
+            constructor = clazz.getDeclaredConstructor();
+        } catch (final NoSuchMethodException e) {
+            throw new IllegalStateException(
+                    String.format("%s has no default constructor", clazz.getName()));
+        }
+        try {
+            return constructor.newInstance();
+        } catch (final IllegalAccessException
+                | InstantiationException
+                | InvocationTargetException e) {
+            throw new IllegalStateException(
+                    String.format("%s has inaccessible default constructor", clazz.getName()));
+        }
+    }
+
+    private static Class<? extends Element> of(final String name, final String namespace) {
+        return EXTENSION_CLASS_MAP.get(new Id(name, namespace));
+    }
+
+    private Extensions() {}
+
+    public static class Id {
+        public final String name;
+        public final String namespace;
+
+        public Id(String name, String namespace) {
+            this.name = name;
+            this.namespace = namespace;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            Id id = (Id) o;
+            return Objects.equal(name, id.name) && Objects.equal(namespace, id.namespace);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hashCode(name, namespace);
+        }
+    }
+}

src/main/java/im/conversations/android/xmpp/model/Extension.java

@@ -0,0 +1,9 @@
+package im.conversations.android.xmpp.model;
+
+import eu.siacs.conversations.xml.Element;
+
+public class Extension extends Element {
+    public Extension(String name, String xmlns) {
+        super(name, xmlns);
+    }
+}

src/main/java/im/conversations/android/xmpp/model/roster/Item.java

@@ -0,0 +1,13 @@
+package im.conversations.android.xmpp.model.roster;
+
+import eu.siacs.conversations.xml.Namespace;
+import im.conversations.android.annotation.XmlElement;
+import im.conversations.android.xmpp.model.Extension;
+
+@XmlElement
+public class Item extends Extension {
+
+    public Item() {
+        super("item", Namespace.ROSTER);
+    }
+}

src/main/java/im/conversations/android/xmpp/model/roster/Query.java

@@ -0,0 +1,17 @@
+package im.conversations.android.xmpp.model.roster;
+
+import eu.siacs.conversations.xml.Namespace;
+import im.conversations.android.annotation.XmlElement;
+import im.conversations.android.xmpp.model.Extension;
+
+@XmlElement(name = "query", namespace = Namespace.ROSTER)
+public class Query extends Extension {
+
+    public Query() {
+        super("query", Namespace.ROSTER);
+    }
+
+    public void setVersion(final String rosterVersion) {
+        this.setAttribute("ver", rosterVersion);
+    }
+}

src/main/java/im/conversations/android/xmpp/model/roster/package-info.java

@@ -0,0 +1,5 @@
+@XmlPackage(namespace = Namespace.ROSTER)
+package im.conversations.android.xmpp.model.roster;
+
+import eu.siacs.conversations.xml.Namespace;
+import im.conversations.android.annotation.XmlPackage;

src/main/java/im/conversations/android/xmpp/processor/BindProcessor.java

@@ -4,10 +4,11 @@ import android.content.Context;
 import android.util.Log;
 import com.google.common.base.Strings;
 import eu.siacs.conversations.Config;
-import eu.siacs.conversations.xml.Namespace;
 import eu.siacs.conversations.xmpp.Jid;
 import eu.siacs.conversations.xmpp.stanzas.IqPacket;
 import im.conversations.android.xmpp.XmppConnection;
+import im.conversations.android.xmpp.model.roster.Item;
+import im.conversations.android.xmpp.model.roster.Query;
 import java.util.function.Consumer;
 
 public class BindProcessor extends AbstractBaseProcessor implements Consumer<Jid> {
@@ -43,12 +44,27 @@ public class BindProcessor extends AbstractBaseProcessor implements Consumer<Jid
         final var database = getDatabase();
         final String rosterVersion = database.accountDao().getRosterVersion(account.id);
         final IqPacket iqPacket = new IqPacket(IqPacket.TYPE.GET);
+        final Query rosterQuery = new Query();
+        iqPacket.addChild(rosterQuery);
         if (Strings.isNullOrEmpty(rosterVersion)) {
             Log.d(Config.LOGTAG, account.address + ": fetching roster");
         } else {
             Log.d(Config.LOGTAG, account.address + ": fetching roster version " + rosterVersion);
+            rosterQuery.setVersion(rosterVersion);
         }
-        iqPacket.query(Namespace.ROSTER).setAttribute("ver", rosterVersion);
+        connection.sendIqPacket(
-        connection.sendIqPacket(iqPacket, result -> {});
+                iqPacket,
+                result -> {
+                    if (result.getType() != IqPacket.TYPE.RESULT) {
+                        return;
+                    }
+                    final Query query = result.getExtension(Query.class);
+                    if (query == null) {
+                        // No query in result means further modifications are sent via pushes
+                        return;
+                    }
+                    // TODO delete entire roster
+                    for (final Item item : query.getExtensions(Item.class)) {}
+                });
     }
 }

src/test/java/im/conversations/android/xmpp/XmlElementReaderTest.java

@@ -0,0 +1,34 @@
+package im.conversations.android.xmpp;
+
+import static org.hamcrest.CoreMatchers.instanceOf;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.assertEquals;
+
+import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xml.XmlElementReader;
+import im.conversations.android.xmpp.model.roster.Item;
+import im.conversations.android.xmpp.model.roster.Query;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.Collection;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.ConscryptMode;
+
+@RunWith(RobolectricTestRunner.class)
+@ConscryptMode(ConscryptMode.Mode.OFF)
+public class XmlElementReaderTest {
+
+    @Test
+    public void readRosterItems() throws IOException {
+        final String xml =
+                "<query xmlns='jabber:iq:roster'><item subscription='none' jid='a@b.c'/><item"
+                        + " subscription='both' jid='d@e.f' ask='subscribe'/></query>";
+        final Element element = XmlElementReader.read(xml.getBytes(StandardCharsets.UTF_8));
+        assertThat(element, instanceOf(Query.class));
+        final Query query = (Query) element;
+        final Collection<Item> items = query.getExtensions(Item.class);
+        assertEquals(2, items.size());
+    }
+}