pojo metadata

Add meta attributes to types attributes or even instances by following hese steps:

1. setup configuration
   stup a basic entity type repository with subrepositories fo entity type, attributeas and your pojos. Also include the memory-meta.xml.

    <import resource="classpath:/atem/impl/memory-meta.xml" />
    <bean id="atem-repository"
    	class="org.atemsource.atem.impl.common.EntityTypeRepositoryImpl"
    	init-method="init">
    	<property name="repositories">
    		<list>
    			<ref bean="atem-entityType-repository" />
    			<ref bean="atem-attribute-repository" />
    			<ref bean="your-pojo-repository" />
    		</list>
    	</property>
    </bean>   
   

2. Setup meta attributes

   To define meta attributes you need the MetaAttributeService instance from the configuration memory-meta.xml:

    // holderType is the type of the object that we want to add the attribute to
    EntityType<Attribute> holderType = entityTypeRepository.getEntityType(Attribute.class);
    // metaDataType is the type of the meta data we want to attach.
    EntityType<MetaDataExample> metaDataType = entityTypeRepository.getEntityType(MetaDataExample.class);
    // Now we define the meta attribute
    SingleAttribute<MetaDataExample> testMetaAttribute =
    	dynamicMetaAttributeService.addSingleMetaAttribute("test", holderType, metaDataType);
   

3. Let us attach meta data to a specific attribute

    EntityType<EntityB> entityType = entityTypeRepository.getEntityType(EntityB.class);
    Attribute attribute = entityType.getAttribute("singleA");
    MetaDataExample ex = new MetaDataExample();
    ex.setData("hallo");
    Attribute metaAttribute = holderType.getMetaAttribute("test");
    metaAttribute.setValue(attribute, ex);