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Difference between revisions of "EclipseLink/UserGuide/MOXy/Overview/DynamicEntities"

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{{EclipseLink_UserGuide
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See http://www.eclipse.org/eclipselink/documentation/2.4/moxy/dynamic_jaxb001.htm
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}}
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=Static and Dynamic Entities=
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==Dynamic MOXy==
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With EclipseLink Dynamic MOXy, you can bootstrap a '''JAXBContext''' from a variety of metadata sources and use exitging JAXB APIs to marshal and unmarshal data… ''without having compiled Java class files on the classpath''. This allows you to alter the metadata source as needed, without having to update and recompile the previously-generated Java source code.
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===Dynamic Entities===
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Instead of using actual Java classes (such as <tt>Customer.class</tt> or <tt>Address.class</tt>), dynamic MOXy uses a simple <tt>get(propertyName)</tt>/<tt>set(propertyName, propertyValue)</tt> API to manipulate data. EclipseLInk generates (in memory) a <tt>DynamicType</tt> associated with each <tt>DynamicEntity</tt>
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{{tip||<tt>DynamicTypes</tt> are similar to Java classes; whereas <tt>DynamicEntities</tt> can be thought of as instances of a <tt>DynamicType</tt>.}}
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'''Example'''
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<source lang="java">
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DynamicEntity customer = (DynamicEntity) dynamicJAXBContext.createUnmarshaller().unmarshal(instanceDoc);
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String lastName = customer.get("lastName");
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List orders = customer.get("orders");
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...
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DynamicEntity address = dContext.newDynamicEntity("mynamespace.Address");
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address.set("street", "1001 Fleet St.");
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customer.set("lastName", lastName + "Jr.");
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customer.set("address", address);
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</source>
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{{EclipseLink_MOXy
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|next=[[EclipseLink/UserGuide/MOXy/Runtime|Runtime]]
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|previous=[[EclipseLink/UserGuide/MOXy/Overview/Annotations|Annotations]]
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|up=[[EclipseLink/UserGuide/MOXy/Overview|Overview]]
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|version=2.2.0}}
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Can use Dynamic MOXy when:
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*You want to start from an XML Schema (XSD) and have EclipseLink generate classes for you
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*You do not want to deal with concrete Java domain classes
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'''Introduction to Dynamic MOXy:'''
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*http://wiki.eclipse.org/EclipseLink/Development/2.1/DynamicMOXy/296967/Documentation#Dynamic_MOXy_-_JAXB_with_Dynamically_Generated_Java_Classes
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Latest revision as of 10:35, 8 November 2012

See http://www.eclipse.org/eclipselink/documentation/2.4/moxy/dynamic_jaxb001.htm