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Immutable objects must not implemented TypedCloneable

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also add a note about that to the developers documentation.
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Florian Schmaus 2015-03-12 13:12:39 +01:00
parent 0b322419ce
commit 41b74ec13c
2 changed files with 20 additions and 6 deletions
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23
documentation/developer/stanzas.md
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@ -1,10 +1,25 @@
PacketExtension General Rules
=============== =============
All classes which subclass `TopLevelStreamElement` and `ExtensionElement` must either
1. be immutable (and ideally provide a Builder)
2. implemented `TypedCloneable`
and must be `Serializable`.
The reason that it must be either 1. or 2. is that it makes no sense to clone an inmutable instance.
Note that there is legacy code in Smack which does not follow these rules. Patches welcome.
ExtensionElement
================
Extension elements are XML elements that are used in various parts and levels of stanzas.
The static `from(Stanza)` Method The static `from(Stanza)` Method
-------------------------------- --------------------------------
Every PacketExtension class must have a static `from()` method that retrieves that extension for a given Stanza (if any). Every ExtensionElement class must have a static `from()` method that retrieves that extension for a given Stanza (if any).
Sample Code Sample Code
@ -14,4 +29,4 @@ public static RSMSet from(Stanza) {
} }
``` ```
Sometimes certain PacketExtension's are only found in one stanza type, in that case, specify the parameter type. For example `public static CarbonExtension getFrom(Message)`. Sometimes certain ExtensionElement's are only found in one stanza type, in that case, specify the parameter type. For example `public static CarbonExtension getFrom(Message)`.

3
smack-extensions/src/main/java/org/jivesoftware/smackx/muc/packet/Destroy.java
View file

@ -19,7 +19,6 @@ package org.jivesoftware.smackx.muc.packet;
import java.io.Serializable; import java.io.Serializable;
import org.jivesoftware.smack.packet.NamedElement; import org.jivesoftware.smack.packet.NamedElement;
import org.jivesoftware.smack.util.TypedCloneable;
import org.jivesoftware.smack.util.XmlStringBuilder; import org.jivesoftware.smack.util.XmlStringBuilder;
import org.jxmpp.jid.BareJid; import org.jxmpp.jid.BareJid;
@ -30,7 +29,7 @@ import org.jxmpp.jid.BareJid;
* *
* @author Gaston Dombiak * @author Gaston Dombiak
*/ */
public class Destroy implements NamedElement, TypedCloneable<Destroy>, Serializable { public class Destroy implements NamedElement, Serializable {
/** /**
* *
*/ */