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https://codeberg.org/Mercury-IM/Smack
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3d4e7938a7
ExtensionElement is now a marker interface that requires all implementation non-abstract classes to carry a static final QNAME field (of type QName). This is verified by a new unit test. Also FullyQualifiedElement is renamed to simply XmlElement. XmlElement is used over ExtensionElement when implementing classes do not statically know the qualified name of the XML elements they represent. In general, XmlElement should be used sparingly, and every XML element should be modeled by its own Java class (implementing ExtensionElement).
33 lines
1.4 KiB
Java
33 lines
1.4 KiB
Java
/**
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*
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* Copyright 2003-2007 Jive Software, 2018-2021 Florian Schmaus.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.packet;
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/**
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* Interface to represent XMPP extension elements. Unlike {@link XmlElement}, every non-abstract class that implements
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* {@link ExtensionElement} must have a static final QNAME member of the type {@link javax.xml.namespace.QName}. This
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* allows type-safe functions like {@link StanzaView#getExtension(Class)}. Hence this is a marker interface.
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* <p>
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* Use this class when implementing new extension elements when possible. This means that every instance of your
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* implemented class must represent an XML element of the same qualified name.
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* </p>
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*
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* @see <a href="https://tools.ietf.org/html/rfc6120#section-8.4">RFC 6120 § 8.4 Extended Content</a>
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*/
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public interface ExtensionElement extends XmlElement {
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}
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