Add TypedCloneable

smack-core/src/main/java/org/jivesoftware/smack/packet/Message.java

@@ -24,6 +24,7 @@ import java.util.List;
 import java.util.Locale;
 import java.util.Set;
 
+import org.jivesoftware.smack.util.TypedCloneable;
 import org.jivesoftware.smack.util.XmlStringBuilder;
 
 /**
@@ -50,7 +51,7 @@ import org.jivesoftware.smack.util.XmlStringBuilder;
  *
  * @author Matt Tucker
  */
-public final class Message extends Stanza implements Cloneable {
+public final class Message extends Stanza implements TypedCloneable<Message> {
 
     public static final String ELEMENT = "message";
     public static final String BODY = "body";

smack-core/src/main/java/org/jivesoftware/smack/packet/Presence.java

@@ -20,6 +20,7 @@ package org.jivesoftware.smack.packet;
 import java.util.Locale;
 
 import org.jivesoftware.smack.util.Objects;
+import org.jivesoftware.smack.util.TypedCloneable;
 import org.jivesoftware.smack.util.XmlStringBuilder;
 
 /**
@@ -55,7 +56,7 @@ import org.jivesoftware.smack.util.XmlStringBuilder;
  *
  * @author Matt Tucker
  */
-public final class Presence extends Stanza implements Cloneable {
+public final class Presence extends Stanza implements TypedCloneable<Presence> {
 
     public static final String ELEMENT = "presence";
 

smack-core/src/main/java/org/jivesoftware/smack/util/TypedCloneable.java

@@ -0,0 +1,34 @@
+/**
+ *
+ * Copyright 2015 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.smack.util;
+
+/**
+ * An extended version of {@link java.lang.Cloneable}, which defines a generic {@link #clone()}
+ * method.
+ *
+ * @param <T> the type returned by {@link #clone()}.
+ */
+public interface TypedCloneable<T> extends Cloneable {
+
+    /**
+     * Clone this instance.
+     *
+     * @return a cloned version of this instance.
+     */
+    public T clone();
+
+}

smack-extensions/src/main/java/org/jivesoftware/smackx/disco/packet/DiscoverInfo.java

@@ -18,6 +18,7 @@ package org.jivesoftware.smackx.disco.packet;
 
 import org.jivesoftware.smack.packet.IQ;
 import org.jivesoftware.smack.util.StringUtils;
+import org.jivesoftware.smack.util.TypedCloneable;
 import org.jivesoftware.smack.util.XmlStringBuilder;
 import org.jxmpp.util.XmppStringUtils;
 
@@ -38,7 +39,7 @@ import java.util.Set;
  *
  * @author Gaston Dombiak
  */
-public class DiscoverInfo extends IQ implements Cloneable {
+public class DiscoverInfo extends IQ implements TypedCloneable<DiscoverInfo> {
 
     public static final String ELEMENT = QUERY_ELEMENT;
     public static final String NAMESPACE = "http://jabber.org/protocol/disco#info";
@@ -266,7 +267,7 @@ public class DiscoverInfo extends IQ implements Cloneable {
      * attributes.
      * 
      */
-    public static class Identity implements Comparable<Identity>, Cloneable {
+    public static class Identity implements Comparable<Identity>, TypedCloneable<Identity> {
 
         private final String category;
         private final String type;
@@ -473,7 +474,7 @@ public class DiscoverInfo extends IQ implements Cloneable {
      * as well as specific feature types of interest, if any (e.g., for the purpose of feature 
      * negotiation).
      */
-    public static class Feature implements Cloneable {
+    public static class Feature implements TypedCloneable<Feature> {
 
         private final String variable;