org.eclipse.xtext.scoping.impl

Class AbstractDeclarativeScopeProvider

java.lang.Object

org.eclipse.xtext.scoping.impl.AbstractScopeProvider

org.eclipse.xtext.scoping.impl.AbstractDeclarativeScopeProvider

All Implemented Interfaces:

IDelegatingScopeProvider, IScopeProvider

public abstract class AbstractDeclarativeScopeProvider
extends AbstractScopeProvider
implements IDelegatingScopeProvider

A scope provider that invokes methods reflectively. At first it looks for methods of the following signature: IScope scope_[EClassName]_[EReferenceName](MyType context, EReference ref)

That is if getScope(EObject, EReference) is called where EReference is e.g. Property.type and the ctx is an instance of Property, than the corresponding signature could be:

IScope scope_Property_type(Property prop, EReference ref)

If there is no method with the given name and a first parameter type which is compatible to the actual context object, the implementation invokes getPredicate(EObject, EReference) for the eContainer of the context EObject. For instance of a Property resides in an Entity the getScope(EObject, EReference) would be called for the containing Entity. This is done as long as there is an eContainer.
If after walking up the containment hierarchy no suitable scoping declaration has been found, the implementation falls back to invoke methods with the following signature (computed by getPredicate(EObject, EClass)):

IScope scope_[EClassName](MyType context, EReference ref)

For instance if a scope provider is asked to return all Entities which are visible from a certain Property, it looks for a method like this:

IScope scope_Entity(Property property, EReference ref)

Again the first parameter can also be any super type of the actual type and the implementation walks up the containment hierarchy again.

If still no method could be found null is returned

Author:

Sven Efftinge - Initial contribution and API, Sebastian Zarnekow

Field Summary

Fields

Modifier and Type	Field and Description
org.apache.log4j.Logger	logger
static String	NAMED_DELEGATE
static String	NAMED_ERROR_HANDLER

Constructor Summary

Constructors

Constructor and Description
AbstractDeclarativeScopeProvider()

Method Summary

Methods

Modifier and Type	Method and Description
protected IScope	delegateGetScope(org.eclipse.emf.ecore.EObject context, org.eclipse.emf.ecore.EReference reference)
IScopeProvider	getDelegate() Provides access to the delegate.
PolymorphicDispatcher.ErrorHandler<IScope>	getErrorHandler()
protected com.google.common.base.Predicate<Method>	getPredicate(org.eclipse.emf.ecore.EObject context, org.eclipse.emf.ecore.EClass type)
protected com.google.common.base.Predicate<Method>	getPredicate(org.eclipse.emf.ecore.EObject context, org.eclipse.emf.ecore.EReference reference)
IScope	getScope(org.eclipse.emf.ecore.EObject context, org.eclipse.emf.ecore.EReference reference) Returns a scope for the given context.
protected IScope	polymorphicFindScopeForClassName(org.eclipse.emf.ecore.EObject context, org.eclipse.emf.ecore.EReference reference)
protected IScope	polymorphicFindScopeForReferenceName(org.eclipse.emf.ecore.EObject context, org.eclipse.emf.ecore.EReference reference)
void	setDelegate(IScopeProvider delegate)
void	setErrorHandler(PolymorphicDispatcher.ErrorHandler<IScope> errorHandler)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NAMED_DELEGATE

public static final String NAMED_DELEGATE

See Also:

Constant Field Values

NAMED_ERROR_HANDLER

public static final String NAMED_ERROR_HANDLER

See Also:

Constant Field Values

logger

public final org.apache.log4j.Logger logger

Constructor Detail

AbstractDeclarativeScopeProvider

public AbstractDeclarativeScopeProvider()

Method Detail

delegateGetScope

protected IScope delegateGetScope(org.eclipse.emf.ecore.EObject context,
                      org.eclipse.emf.ecore.EReference reference)

setDelegate

public void setDelegate(IScopeProvider delegate)

getDelegate

public IScopeProvider getDelegate()

Description copied from interface: IDelegatingScopeProvider

Provides access to the delegate.

Specified by:

getDelegate in interface IDelegatingScopeProvider

Returns:

the delegate. May not be null.

getPredicate

protected com.google.common.base.Predicate<Method> getPredicate(org.eclipse.emf.ecore.EObject context,
                                                    org.eclipse.emf.ecore.EClass type)

getPredicate

protected com.google.common.base.Predicate<Method> getPredicate(org.eclipse.emf.ecore.EObject context,
                                                    org.eclipse.emf.ecore.EReference reference)

getScope

public IScope getScope(org.eclipse.emf.ecore.EObject context,
              org.eclipse.emf.ecore.EReference reference)

Description copied from interface: IScopeProvider

Returns a scope for the given context. The scope provides access to the compatible visible EObjects for a given reference.

Specified by:

getScope in interface IScopeProvider

Parameters:

context - the element from which an element shall be referenced. It doesn't need to be the element containing the reference, it is just used to find the most inner scope for given EReference.

reference - the reference for which to get the scope.

Returns:

IScope representing the innermost IScope for the passed context and reference. Note for implementors: The result may not be null. Return IScope.NULLSCOPE instead.

polymorphicFindScopeForClassName

protected IScope polymorphicFindScopeForClassName(org.eclipse.emf.ecore.EObject context,
                                      org.eclipse.emf.ecore.EReference reference)

polymorphicFindScopeForReferenceName

protected IScope polymorphicFindScopeForReferenceName(org.eclipse.emf.ecore.EObject context,
                                          org.eclipse.emf.ecore.EReference reference)

setErrorHandler

public void setErrorHandler(PolymorphicDispatcher.ErrorHandler<IScope> errorHandler)

getErrorHandler

public PolymorphicDispatcher.ErrorHandler<IScope> getErrorHandler()