Java Code Examples for org.eclipse.jdt.core.dom.Expression#resolveTypeBinding()

private static AbstractControlVariable generateConditionControlVariable(Expression dataStructure)
{
	// initialize startValue
	VariableValue startValue = new VariableValue(0);
	// initialize endValue
	VariableValue endValue = null;
	ITypeBinding dataStructureBinding = dataStructure.resolveTypeBinding();
	// if the dataStructure is an array or a mehtodInvocation returning and array (both covered by the first expression) OR
	// the data structure is a collection or the data structure is a methodInvocation returning a collection (both covered by the second expression)
	// These are the only cases supported by the JAVA enhanced for loop
	if (dataStructureBinding.isArray() || AbstractLoopUtilities.isCollection(dataStructureBinding))
	{
		endValue = new VariableValue(VariableValue.ValueType.DATA_STRUCTURE_SIZE);
	}
	// initialize variableUpdaters
	List<VariableUpdater> variableUpdaters = new ArrayList<VariableUpdater>();
	variableUpdaters.add(new VariableUpdater(1));
	if (endValue == null)
	{
		return null;
	}
	return new AbstractControlVariable(startValue, endValue, variableUpdaters, dataStructure);
}
 

/**
 * @param e
 * @return int
 *          Checks.IS_RVALUE			if e is an rvalue
 *          Checks.IS_RVALUE_GUESSED	if e is guessed as an rvalue
 *          Checks.NOT_RVALUE_VOID  	if e is not an rvalue because its type is void
 *          Checks.NOT_RVALUE_MISC  	if e is not an rvalue for some other reason
 */
public static int checkExpressionIsRValue(Expression e) {
	if (e instanceof Name) {
		if(!(((Name) e).resolveBinding() instanceof IVariableBinding)) {
			return NOT_RVALUE_MISC;
		}
	}
	if (e instanceof Annotation)
		return NOT_RVALUE_MISC;
		

	ITypeBinding tb= e.resolveTypeBinding();
	boolean guessingRequired= false;
	if (tb == null) {
		guessingRequired= true;
		tb= ASTResolving.guessBindingForReference(e);
	}
	if (tb == null)
		return NOT_RVALUE_MISC;
	else if (tb.getName().equals("void")) //$NON-NLS-1$
		return NOT_RVALUE_VOID;

	return guessingRequired ? IS_RVALUE_GUESSED : IS_RVALUE;
}
 

private static ITypeBinding[] getArgumentTypes(List<Expression> arguments) {
	ITypeBinding[] res= new ITypeBinding[arguments.size()];
	for (int i= 0; i < res.length; i++) {
		Expression expression= arguments.get(i);
		ITypeBinding curr= expression.resolveTypeBinding();
		if (curr == null) {
			return null;
		}
		if (!curr.isNullType()) {	// don't normalize null type
			curr= Bindings.normalizeTypeBinding(curr);
			if (curr == null) {
				curr= expression.getAST().resolveWellKnownType("java.lang.Object"); //$NON-NLS-1$
			}
		}
		res[i]= curr;
	}
	return res;
}
 

private ITypeBinding getExpressionType(MethodInvocation invocation) {
	Expression expression= invocation.getExpression();
	ITypeBinding typeBinding= null;
	if (expression == null) {
		typeBinding= invocation.resolveMethodBinding().getDeclaringClass();
	} else {
		typeBinding= expression.resolveTypeBinding();
	}
	if (typeBinding != null && typeBinding.isTypeVariable()) {
		ITypeBinding[] typeBounds= typeBinding.getTypeBounds();
		if (typeBounds.length > 0) {
			for (ITypeBinding typeBound : typeBounds) {
				ITypeBinding expressionType= getExpressionType(invocation, typeBound);
				if (expressionType != null) {
					return expressionType;
				}
			}
			typeBinding= typeBounds[0].getTypeDeclaration();
		} else {
			typeBinding= invocation.getAST().resolveWellKnownType("java.lang.Object"); //$NON-NLS-1$
		}
	}
	Assert.isNotNull(typeBinding, "Type binding of target expression may not be null"); //$NON-NLS-1$
	return typeBinding;
}
 

public ITypeBinding getReceiverType() {
	Expression expression= Invocations.getExpression(invocation);
	if (expression != null) {
		return expression.resolveTypeBinding();
	}
	IMethodBinding method= Invocations.resolveBinding(invocation);
	if (method != null) {
		return method.getDeclaringClass();
	}
	return null;
}
 

public static CUCorrectionProposal getAssignVariableProposal(CodeActionParams params, IInvocationContext context, boolean problemsAtLocation, Map formatterOptions, boolean returnAsCommand,
		IProblemLocationCore[] locations)
		throws CoreException {
	ASTNode node = context.getCoveringNode();
	Statement statement = ASTResolving.findParentStatement(node);
	if (!(statement instanceof ExpressionStatement)) {
		return null;
	}
	ExpressionStatement expressionStatement = (ExpressionStatement) statement;
	Expression expression = expressionStatement.getExpression();
	if (expression.getNodeType() == ASTNode.ASSIGNMENT) {
		return null;
	}
	ITypeBinding typeBinding = expression.resolveTypeBinding();
	typeBinding = Bindings.normalizeTypeBinding(typeBinding);
	if (typeBinding == null) {
		return null;
	}
	if (containsMatchingProblem(locations, IProblem.UnusedObjectAllocation)) {
		return null;
	}
	final ICompilationUnit cu = context.getCompilationUnit();
	int relevance;
	if (context.getSelectionLength() == 0) {
		relevance = IProposalRelevance.EXTRACT_LOCAL_ZERO_SELECTION;
	} else if (problemsAtLocation) {
		relevance = IProposalRelevance.EXTRACT_LOCAL_ERROR;
	} else {
		relevance = IProposalRelevance.EXTRACT_LOCAL;
	}
	if (returnAsCommand) {
		return new AssignToVariableAssistCommandProposal(cu, JavaCodeActionKind.REFACTOR_ASSIGN_VARIABLE, AssignToVariableAssistProposal.LOCAL, expressionStatement, typeBinding, relevance, APPLY_REFACTORING_COMMAND_ID,
				Arrays.asList(ASSIGN_VARIABLE_COMMAND, params));
	} else {
		return new AssignToVariableAssistProposal(cu, JavaCodeActionKind.REFACTOR_ASSIGN_VARIABLE, AssignToVariableAssistProposal.LOCAL, expressionStatement, typeBinding, relevance);
	}
}
 

public static CUCorrectionProposal getAssignFieldProposal(CodeActionParams params, IInvocationContext context, boolean problemsAtLocation, Map formatterOptions, boolean returnAsCommand,
		IProblemLocationCore[] locations) throws CoreException {
	ASTNode node = context.getCoveringNode();
	Statement statement = ASTResolving.findParentStatement(node);
	if (!(statement instanceof ExpressionStatement)) {
		return null;
	}
	ExpressionStatement expressionStatement = (ExpressionStatement) statement;
	Expression expression = expressionStatement.getExpression();
	if (expression.getNodeType() == ASTNode.ASSIGNMENT) {
		return null;
	}
	ITypeBinding typeBinding = expression.resolveTypeBinding();
	typeBinding = Bindings.normalizeTypeBinding(typeBinding);
	if (typeBinding == null) {
		return null;
	}
	if (containsMatchingProblem(locations, IProblem.UnusedObjectAllocation)) {
		return null;
	}
	final ICompilationUnit cu = context.getCompilationUnit();
	ASTNode type = ASTResolving.findParentType(expression);
	if (type != null) {
		int relevance;
		if (context.getSelectionLength() == 0) {
			relevance = IProposalRelevance.EXTRACT_LOCAL_ZERO_SELECTION;
		} else if (problemsAtLocation) {
			relevance = IProposalRelevance.EXTRACT_LOCAL_ERROR;
		} else {
			relevance = IProposalRelevance.EXTRACT_LOCAL;
		}
		if (returnAsCommand) {
			return new AssignToVariableAssistCommandProposal(cu, JavaCodeActionKind.REFACTOR_ASSIGN_FIELD, AssignToVariableAssistProposal.FIELD, expressionStatement, typeBinding, relevance, APPLY_REFACTORING_COMMAND_ID,
					Arrays.asList(ASSIGN_FIELD_COMMAND, params));
		} else {
			return new AssignToVariableAssistProposal(cu, JavaCodeActionKind.REFACTOR_ASSIGN_FIELD, AssignToVariableAssistProposal.FIELD, expressionStatement, typeBinding, relevance);
		}
	}
	return null;
}
 

private ITypeBinding guessBindingForReference(Expression expression) {
	ITypeBinding binding = expression.resolveTypeBinding();
	if (binding == null) {
		binding = ASTResolving.guessBindingForReference(expression);
	}
	return binding;
}
 

private RefactoringStatus checkTempTypeForLocalTypeUsage() throws JavaModelException {
	Expression expression = getSelectedExpression().getAssociatedExpression();
	Type resultingType = null;
	ITypeBinding typeBinding = expression.resolveTypeBinding();
	AST ast = fCURewrite.getAST();

	if (expression instanceof ClassInstanceCreation && (typeBinding == null || typeBinding.getTypeArguments().length == 0)) {
		resultingType = ((ClassInstanceCreation) expression).getType();
	} else if (expression instanceof CastExpression) {
		resultingType = ((CastExpression) expression).getType();
	} else {
		if (typeBinding == null) {
			typeBinding = ASTResolving.guessBindingForReference(expression);
		}
		if (typeBinding != null) {
			typeBinding = Bindings.normalizeForDeclarationUse(typeBinding, ast);
			ImportRewrite importRewrite = fCURewrite.getImportRewrite();
			ImportRewriteContext context = new ContextSensitiveImportRewriteContext(expression, importRewrite);
			resultingType = importRewrite.addImport(typeBinding, ast, context, TypeLocation.LOCAL_VARIABLE);
		} else {
			resultingType = ast.newSimpleType(ast.newSimpleName("Object")); //$NON-NLS-1$
		}
	}

	IMethodBinding declaringMethodBinding = getMethodDeclaration().resolveBinding();
	ITypeBinding[] methodTypeParameters = declaringMethodBinding == null ? new ITypeBinding[0] : declaringMethodBinding.getTypeParameters();
	LocalTypeAndVariableUsageAnalyzer analyzer = new LocalTypeAndVariableUsageAnalyzer(methodTypeParameters);
	resultingType.accept(analyzer);
	boolean usesLocalTypes = !analyzer.getUsageOfEnclosingNodes().isEmpty();
	if (usesLocalTypes) {
		return RefactoringStatus.createFatalErrorStatus(RefactoringCoreMessages.ExtractFieldRefactoring_uses_type_declared_locally);
	}
	return null;
}
 

public static boolean isLengthFieldAccess(Expression expression)
{
	SimpleName name          = null;
	ITypeBinding typeBinding = null;
	if (expression instanceof QualifiedName)
	{
		QualifiedName qualifiedName = (QualifiedName) expression;
		name                        = qualifiedName.getName();
		Name qualifier              = qualifiedName.getQualifier();
		typeBinding                 = qualifier.resolveTypeBinding();
	}
	else if (expression instanceof FieldAccess)
	{
		FieldAccess fieldAccess           = (FieldAccess)expression;
		name                              = fieldAccess.getName();
		Expression fieldAsccessExpression = fieldAccess.getExpression();
		typeBinding                       = fieldAsccessExpression.resolveTypeBinding();
	}
	if (name != null && typeBinding != null)
	{
		IBinding nameBinding = name.resolveBinding();
		if (nameBinding != null && nameBinding.getKind() == IBinding.VARIABLE && typeBinding != null)
		{
			IVariableBinding nameVariableBinding = (IVariableBinding) nameBinding;
			return (nameVariableBinding.getName().equals("length") && typeBinding.isArray());
		}
	}
	return false;
}
 

private static boolean useExistingParentCastProposal(ICompilationUnit cu, CastExpression expression, Expression accessExpression, SimpleName accessSelector, ITypeBinding[] paramTypes, Collection<ICommandAccess> proposals) {
	ITypeBinding castType= expression.getType().resolveBinding();
	if (castType == null) {
		return false;
	}
	if (paramTypes != null) {
		if (Bindings.findMethodInHierarchy(castType, accessSelector.getIdentifier(), paramTypes) == null) {
			return false;
		}
	} else if (Bindings.findFieldInHierarchy(castType, accessSelector.getIdentifier()) == null) {
		return false;
	}
	ITypeBinding bindingToCast= accessExpression.resolveTypeBinding();
	if (bindingToCast != null && !bindingToCast.isCastCompatible(castType)) {
		return false;
	}

	IMethodBinding res= Bindings.findMethodInHierarchy(castType, accessSelector.getIdentifier(), paramTypes);
	if (res != null) {
		AST ast= expression.getAST();
		ASTRewrite rewrite= ASTRewrite.create(ast);
		CastExpression newCast= ast.newCastExpression();
		newCast.setType((Type) ASTNode.copySubtree(ast, expression.getType()));
		newCast.setExpression((Expression) rewrite.createCopyTarget(accessExpression));
		ParenthesizedExpression parents= ast.newParenthesizedExpression();
		parents.setExpression(newCast);

		ASTNode node= rewrite.createCopyTarget(expression.getExpression());
		rewrite.replace(expression, node, null);
		rewrite.replace(accessExpression, parents, null);

		String label= CorrectionMessages.UnresolvedElementsSubProcessor_missingcastbrackets_description;
		Image image= JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CAST);
		ASTRewriteCorrectionProposal proposal= new ASTRewriteCorrectionProposal(label, cu, rewrite, IProposalRelevance.ADD_PARENTHESES_AROUND_CAST, image);
		proposals.add(proposal);
		return true;
	}
	return false;
}
 

public static Entry get(Expression type) {
	ITypeBinding ib = type.resolveTypeBinding();
	if(ib == null) {
		if(type instanceof MethodInvocation) {
			IMethodBinding mi = ((MethodInvocation)type).resolveMethodBinding();
			if(mi != null) ib = mi.getReturnType();
		}
	}	
	
	if(ib == null) {
		CompilerError.exec(CompilerError.TYPE_NOT_FOUND, type.toString() + ", " + type.getClass());
		return null;
	}
	else return get(ib);
}
 

private static ITypeBinding extractExpressionType(ExpressionStatement statement) {
	Expression expression= statement.getExpression();
	if (expression.getNodeType() == ASTNode.METHOD_INVOCATION
			|| expression.getNodeType() == ASTNode.FIELD_ACCESS) {
		return expression.resolveTypeBinding();
	}
	return null;
}
 

public static boolean getAssignToVariableProposals(IInvocationContext context, ASTNode node, IProblemLocation[] locations, Collection<ICommandAccess> resultingCollections) {
	Statement statement= ASTResolving.findParentStatement(node);
	if (!(statement instanceof ExpressionStatement)) {
		return false;
	}
	ExpressionStatement expressionStatement= (ExpressionStatement) statement;

	Expression expression= expressionStatement.getExpression();
	if (expression.getNodeType() == ASTNode.ASSIGNMENT) {
		return false; // too confusing and not helpful
	}

	ITypeBinding typeBinding= expression.resolveTypeBinding();
	typeBinding= Bindings.normalizeTypeBinding(typeBinding);
	if (typeBinding == null) {
		return false;
	}
	if (resultingCollections == null) {
		return true;
	}

	// don't add if already added as quick fix
	if (containsMatchingProblem(locations, IProblem.UnusedObjectAllocation))
		return false;
	
	ICompilationUnit cu= context.getCompilationUnit();

	AssignToVariableAssistProposal localProposal= new AssignToVariableAssistProposal(cu, AssignToVariableAssistProposal.LOCAL, expressionStatement, typeBinding, IProposalRelevance.ASSIGN_TO_LOCAL);
	localProposal.setCommandId(ASSIGN_TO_LOCAL_ID);
	resultingCollections.add(localProposal);

	ASTNode type= ASTResolving.findParentType(expression);
	if (type != null) {
		AssignToVariableAssistProposal fieldProposal= new AssignToVariableAssistProposal(cu, AssignToVariableAssistProposal.FIELD, expressionStatement, typeBinding, IProposalRelevance.ASSIGN_TO_FIELD);
		fieldProposal.setCommandId(ASSIGN_TO_FIELD_ID);
		resultingCollections.add(fieldProposal);
	}
	return true;

}
 

private static boolean isBoolean(Expression expression) {
	ITypeBinding typeBinding = expression.resolveTypeBinding();
	AST ast = expression.getAST();
	return typeBinding == ast.resolveWellKnownType("boolean") //$NON-NLS-1$
			|| typeBinding == ast.resolveWellKnownType("java.lang.Boolean"); //$NON-NLS-1$
}
 

private void initReturnType(ImportRewrite rewriter) {
	AST ast= fEnclosingBodyDeclaration.getAST();
	fReturnType= null;
	fReturnTypeBinding= null;
	switch (fReturnKind) {
		case ACCESS_TO_LOCAL:
			VariableDeclaration declaration= ASTNodes.findVariableDeclaration(fReturnValue, fEnclosingBodyDeclaration);
			fReturnType= ASTNodeFactory.newType(ast, declaration, rewriter, new ContextSensitiveImportRewriteContext(declaration, rewriter));
			if (declaration.resolveBinding() != null) {
				fReturnTypeBinding= declaration.resolveBinding().getType();
			}
			break;
		case EXPRESSION:
			Expression expression= (Expression)getFirstSelectedNode();
			if (expression.getNodeType() == ASTNode.CLASS_INSTANCE_CREATION) {
				fExpressionBinding= ((ClassInstanceCreation)expression).getType().resolveBinding();
			} else {
				fExpressionBinding= expression.resolveTypeBinding();
			}
			if (fExpressionBinding != null) {
				if (fExpressionBinding.isNullType()) {
					getStatus().addFatalError(RefactoringCoreMessages.ExtractMethodAnalyzer_cannot_extract_null_type, JavaStatusContext.create(fCUnit, expression));
				} else {
					ITypeBinding normalizedBinding= Bindings.normalizeForDeclarationUse(fExpressionBinding, ast);
					if (normalizedBinding != null) {
						ImportRewriteContext context= new ContextSensitiveImportRewriteContext(fEnclosingBodyDeclaration, rewriter);
						fReturnType= rewriter.addImport(normalizedBinding, ast, context);
						fReturnTypeBinding= normalizedBinding;
					}
				}
			} else {
				fReturnType= ast.newPrimitiveType(PrimitiveType.VOID);
				fReturnTypeBinding= ast.resolveWellKnownType("void"); //$NON-NLS-1$
				getStatus().addError(RefactoringCoreMessages.ExtractMethodAnalyzer_cannot_determine_return_type, JavaStatusContext.create(fCUnit, expression));
			}
			break;
		case RETURN_STATEMENT_VALUE:
			LambdaExpression enclosingLambdaExpr= ASTResolving.findEnclosingLambdaExpression(getFirstSelectedNode());
			if (enclosingLambdaExpr != null) {
				fReturnType= ASTNodeFactory.newReturnType(enclosingLambdaExpr, ast, rewriter, null);
				IMethodBinding methodBinding= enclosingLambdaExpr.resolveMethodBinding();
				fReturnTypeBinding= methodBinding != null ? methodBinding.getReturnType() : null;
			} else if (fEnclosingBodyDeclaration.getNodeType() == ASTNode.METHOD_DECLARATION) {
				fReturnType= ((MethodDeclaration) fEnclosingBodyDeclaration).getReturnType2();
				fReturnTypeBinding= fReturnType != null ? fReturnType.resolveBinding() : null;
			}
			break;
		default:
			fReturnType= ast.newPrimitiveType(PrimitiveType.VOID);
			fReturnTypeBinding= ast.resolveWellKnownType("void"); //$NON-NLS-1$
	}
	if (fReturnType == null) {
		fReturnType= ast.newPrimitiveType(PrimitiveType.VOID);
		fReturnTypeBinding= ast.resolveWellKnownType("void"); //$NON-NLS-1$
	}
}
 

private List<T> findMethodImplementations(IProgressMonitor monitor) throws CoreException {
	IMethod method = (IMethod) javaElement;
	try {
		if (cannotBeOverriddenMethod(method)) {
			return null;
		}
	} catch (JavaModelException e) {
		JavaLanguageServerPlugin.logException("Find method implementations failure ", e);
		return null;
	}

	CompilationUnit ast = CoreASTProvider.getInstance().getAST(typeRoot, CoreASTProvider.WAIT_YES, monitor);
	if (ast == null) {
		return null;
	}

	ASTNode node = NodeFinder.perform(ast, region.getOffset(), region.getLength());
	ITypeBinding parentTypeBinding = null;
	if (node instanceof SimpleName) {
		ASTNode parent = node.getParent();
		if (parent instanceof MethodInvocation) {
			Expression expression = ((MethodInvocation) parent).getExpression();
			if (expression == null) {
				parentTypeBinding= Bindings.getBindingOfParentType(node);
			} else {
				parentTypeBinding = expression.resolveTypeBinding();
			}
		} else if (parent instanceof SuperMethodInvocation) {
			// Directly go to the super method definition
			return Collections.singletonList(mapper.convert(method, 0, 0));
		} else if (parent instanceof MethodDeclaration) {
			parentTypeBinding = Bindings.getBindingOfParentType(node);
		}
	}
	final IType receiverType = getType(parentTypeBinding);
	if (receiverType == null) {
		return null;
	}

	final List<T> results = new ArrayList<>();
	try {
		String methodLabel = JavaElementLabelsCore.getElementLabel(method, JavaElementLabelsCore.DEFAULT_QUALIFIED);
		monitor.beginTask(Messages.format(JavaElementImplementationHyperlink_search_method_implementors, methodLabel), 10);
		SearchRequestor requestor = new SearchRequestor() {
			@Override
			public void acceptSearchMatch(SearchMatch match) throws CoreException {
				if (match.getAccuracy() == SearchMatch.A_ACCURATE) {
					Object element = match.getElement();
					if (element instanceof IMethod) {
						IMethod methodFound = (IMethod) element;
						if (!JdtFlags.isAbstract(methodFound)) {
							T result = mapper.convert(methodFound, match.getOffset(), match.getLength());
							if (result != null) {
								results.add(result);
							}
						}
					}
				}
			}
		};

		IJavaSearchScope hierarchyScope;
		if (receiverType.isInterface()) {
			hierarchyScope = SearchEngine.createHierarchyScope(method.getDeclaringType());
		} else {
			if (isFullHierarchyNeeded(new SubProgressMonitor(monitor, 3), method, receiverType)) {
				hierarchyScope = SearchEngine.createHierarchyScope(receiverType);
			} else {
				boolean isMethodAbstract = JdtFlags.isAbstract(method);
				hierarchyScope = SearchEngine.createStrictHierarchyScope(null, receiverType, true, isMethodAbstract, null);
			}
		}

		int limitTo = IJavaSearchConstants.DECLARATIONS | IJavaSearchConstants.IGNORE_DECLARING_TYPE | IJavaSearchConstants.IGNORE_RETURN_TYPE;
		SearchPattern pattern = SearchPattern.createPattern(method, limitTo);
		Assert.isNotNull(pattern);
		SearchParticipant[] participants = new SearchParticipant[] { SearchEngine.getDefaultSearchParticipant() };
		SearchEngine engine = new SearchEngine();
		engine.search(pattern, participants, hierarchyScope, requestor, new SubProgressMonitor(monitor, 7));
		if (monitor.isCanceled()) {
			throw new OperationCanceledException();
		}
	} finally {
		monitor.done();
	}
	return results;
}
 

private static ITypeBinding getBinding(Expression node) {
	if (node != null) {
		return node.resolveTypeBinding();
	}
	return null;
}
 

/**
 * Returns the type to which an inlined variable initializer should be cast, or
 * <code>null</code> if no cast is necessary.
 * 
 * @param initializer the initializer expression of the variable to inline
 * @param reference the reference to the variable (which is to be inlined)
 * @return a type binding to which the initializer should be cast, or <code>null</code> iff no cast is necessary
 * @since 3.6
 */
public static ITypeBinding getExplicitCast(Expression initializer, Expression reference) {
	ITypeBinding initializerType= initializer.resolveTypeBinding();
	ITypeBinding referenceType= reference.resolveTypeBinding();
	if (initializerType == null || referenceType == null)
		return null;
	
	if (initializerType.isPrimitive() && referenceType.isPrimitive() && ! referenceType.isEqualTo(initializerType)) {
		return referenceType;
		
	} else if (initializerType.isPrimitive() && ! referenceType.isPrimitive()) { // initializer is autoboxed
		ITypeBinding unboxedReferenceType= Bindings.getUnboxedTypeBinding(referenceType, reference.getAST());
		if (!unboxedReferenceType.isEqualTo(initializerType))
			return unboxedReferenceType;
		else if (needsExplicitBoxing(reference))
			return referenceType;
		
	} else if (! initializerType.isPrimitive() && referenceType.isPrimitive()) { // initializer is autounboxed
		ITypeBinding unboxedInitializerType= Bindings.getUnboxedTypeBinding(initializerType, reference.getAST());
		if (!unboxedInitializerType.isEqualTo(referenceType))
			return referenceType;
		
	} else if (initializerType.isRawType() && referenceType.isParameterizedType()) {
		return referenceType; // don't lose the unchecked conversion

	} else if (initializer instanceof LambdaExpression || initializer instanceof MethodReference) {
		if (isTargetAmbiguous(reference, isExplicitlyTypedLambda(initializer))) {
			return referenceType;
		} else {
			ITypeBinding targetType= getTargetType(reference);
			if (targetType == null || targetType != referenceType) {
				return referenceType;
			}
		}

	} else if (! TypeRules.canAssign(initializerType, referenceType)) {
		if (!Bindings.containsTypeVariables(referenceType))
			return referenceType;
	}
	
	return null;
}
 

private static int getReturnFlag(ReturnStatement node) {
	Expression expression= node.getExpression();
	if (expression == null || expression.resolveTypeBinding() == node.getAST().resolveWellKnownType("void")) //$NON-NLS-1$
		return VOID_RETURN;
	return VALUE_RETURN;
}