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EMF Compare/Specifications/ExtensionPointForAdapterFactories
Evolution Specification: Provide an adapter factory extension mechanism
Current status is DRAFT
Preamble
It enables to provide his own match adapter factory implementation.
- Bug 404274 - Provide an adapter factory extension mechanism
Introduction
There is no actual mechanism to provide his own adapter factory. An extension point mechanism will be useful to allow users to provide their own adapter factories.
Detailed Specification
The aim is to provide a mechanism that allow users to provide their own adapter factory with a specific rank.
The ComposedAdapterFactory used by EMF Compare and the AdapterFactory interface will be extended in order to manage ranking. The new extended ComposedAdapterFactory used by EMF Compare will be named EMFCompareAdapterFactory. The new extended AdapterFactory that the users will have to implement will be named RankedAdapterFactory.
The EMFCompareAdapterFactory will interrogate first his own registry (composed of RankedAdapterFactories) to find an appropriate RankedAdapterFactory. If no appropriate adapter factory is found, then the EMFCompareAdapterFactory will delegate his research to the "default" ComposedAdapterFactory registry.
With this mechanism you will able to provide your own CompareItemProviderAdapterFactory that will overrides the default CompareItemProviderAdapterFactory.
Backward Compatibility and Migration Paths
Metamodel Changes
N/A
API Changes
- New extension point:
- org.eclipse.emf.compare.edit
<extension-point id="adapterFactory" name="EMF Compare Adapter Factory" schema="schema/adapterFactory.exsd"/>
Example of use:
<extension point="org.eclipse.emf.compare.edit.adapterFactory"> <factory uri="http://www.eclipse.org/emf/compare" class="org.eclipse.emf.compare.test.adapterfactory.MyCompareItemProviderAdapterFactorySpec" ranking="10" supportedTypes= "org.eclipse.emf.edit.provider.IEditingDomainItemProvider org.eclipse.emf.edit.provider.IStructuredItemContentProvider org.eclipse.emf.edit.provider.ITreeItemContentProvider org.eclipse.emf.edit.provider.IItemLabelProvider org.eclipse.emf.edit.provider.IItemPropertySource org.eclipse.emf.compare.provider.IItemStyledLabelProvider org.eclipse.emf.compare.provider.IItemDescriptionProvider"/> </extension>
- New implementations:
- org.eclipse.emf.compare.edit
- org.eclipse.emf.compare.internal.adapterfactory.EMFCompareAdapterFactory
- org.eclipse.emf.compare.edit
- New interfaces:
- org.eclipse.emf.compare.edit
- org.eclipse.emf.compare.internal.adapterfactory.RankedAdapterFactory
- org.eclipse.emf.compare.edit
public interface RankedAdapterFactory extends AdapterFactory { int getRanking(); void setRanking(int ranking); }
- org.eclipse.emf.compare.internal.adapterfactory.EMFCompareAdapterFactory.Descriptor
- org.eclipse.emf.compare.internal.adapterfactory.EMFCompareAdapterFactory.Descriptor.Registry
public interface Descriptor extends ComposedAdapterFactory.Descriptor { int getRanking(); interface Registry extends ComposedAdapterFactory.Descriptor.Registry { } }
User Interface Changes
N/A
Documentation Changes
This documentation will have to be updated:
- New and Noteworthy
- Developer Guide
Tests and Non-regression strategy
JUnit tests: EMFCompareAdapterFactoryTest.java in o.e.e.c.tests.
Implementation choices and tradeoffs
N/A