org.eclipse.jdt.core.dom.SingleVariableDeclaration#getInitializer ( )源码实例Demo

private Svd visit(SingleVariableDeclaration node){
	int startLine = _cunit.getLineNumber(node.getStartPosition());
	int endLine = _cunit.getLineNumber(node.getStartPosition() + node.getLength());
	Svd svd = new Svd(startLine, endLine, node);
	
	svd.setDecType(node.getType());
	if(node.getInitializer() != null){
		Expr initializer = (Expr) process(node.getInitializer());
		initializer.setParent(svd);
		svd.setInitializer(initializer);
	}
	
	SName name = (SName) process(node.getName());
	name.setParent(svd);
	svd.setName(name);
	
	return svd;
}
 

public VariableDeclaration(CompilationUnit cu, String filePath, SingleVariableDeclaration fragment) {
	this.annotations = new ArrayList<UMLAnnotation>();
	List<IExtendedModifier> extendedModifiers = fragment.modifiers();
	for(IExtendedModifier extendedModifier : extendedModifiers) {
		if(extendedModifier.isAnnotation()) {
			Annotation annotation = (Annotation)extendedModifier;
			this.annotations.add(new UMLAnnotation(cu, filePath, annotation));
		}
	}
	this.locationInfo = new LocationInfo(cu, filePath, fragment, extractVariableDeclarationType(fragment));
	this.variableName = fragment.getName().getIdentifier();
	this.initializer = fragment.getInitializer() != null ? new AbstractExpression(cu, filePath, fragment.getInitializer(), CodeElementType.VARIABLE_DECLARATION_INITIALIZER) : null;
	Type astType = extractType(fragment);
	this.type = UMLType.extractTypeObject(cu, filePath, astType, fragment.getExtraDimensions());
	int startOffset = fragment.getStartPosition();
	ASTNode scopeNode = getScopeNode(fragment);
	int endOffset = scopeNode.getStartPosition() + scopeNode.getLength();
	this.scope = new VariableScope(cu, filePath, startOffset, endOffset);
}
 

@Override
public ITypeConstraint[] create(SingleVariableDeclaration svd){
	ITypeConstraint[] defines= fTypeConstraintFactory.createDefinesConstraint(
			fConstraintVariableFactory.makeExpressionOrTypeVariable(svd.getName(), getContext()),
			fConstraintVariableFactory.makeTypeVariable(svd.getType()));
	if (svd.getInitializer() == null)
		return defines;
	ITypeConstraint[] constraints = fTypeConstraintFactory.createSubtypeConstraint(
			fConstraintVariableFactory.makeExpressionOrTypeVariable(svd.getInitializer(), getContext()),
			fConstraintVariableFactory.makeExpressionOrTypeVariable(svd.getName(), getContext()));
	if (defines.length == 0 && constraints.length == 0){
		return new ITypeConstraint[0];
	} else if (defines.length == 0){
		return constraints;
	} else if (constraints.length == 0){
		return defines;
	} else {
		List<ITypeConstraint> all= new ArrayList<ITypeConstraint>();
		all.addAll(Arrays.asList(defines));
		all.addAll(Arrays.asList(constraints));
		return (ITypeConstraint[])all.toArray();
	}
}
 

@Override
public void endVisit(SingleVariableDeclaration node) {
	if (skipNode(node)) {
		return;
	}

	IVariableBinding binding = node.resolveBinding();
	LocalFlowInfo nameInfo = null;
	Expression initializer = node.getInitializer();
	if (binding != null && !binding.isField() && initializer != null) {
		nameInfo = new LocalFlowInfo(binding, FlowInfo.WRITE, fFlowContext);
	}
	GenericSequentialFlowInfo info = processSequential(node, node.getType(), initializer);
	info.merge(nameInfo, fFlowContext);
}
 

@Override
public boolean visit(final SingleVariableDeclaration it) {
  if ((((it.getParent() instanceof MethodDeclaration) || (it.getParent() instanceof CatchClause)) || 
    (it.getParent() instanceof EnhancedForStatement))) {
    final Function1<IExtendedModifier, Boolean> _function = (IExtendedModifier it_1) -> {
      return Boolean.valueOf(it_1.isAnnotation());
    };
    this.appendModifiers(it, IterableExtensions.<IExtendedModifier>filter(Iterables.<IExtendedModifier>filter(it.modifiers(), IExtendedModifier.class), _function));
  } else {
    this.appendModifiers(it, it.modifiers());
  }
  it.getType().accept(this);
  this.appendExtraDimensions(it.getExtraDimensions());
  boolean _isVarargs = it.isVarargs();
  if (_isVarargs) {
    this.appendToBuffer("...");
  }
  this.appendSpaceToBuffer();
  it.getName().accept(this);
  Expression _initializer = it.getInitializer();
  boolean _tripleNotEquals = (_initializer != null);
  if (_tripleNotEquals) {
    this.appendToBuffer("=");
    it.getInitializer().accept(this);
  }
  return false;
}
 

@Override
public final void endVisit(final SingleVariableDeclaration node) {
	final ConstraintVariable2 ancestor= (ConstraintVariable2) node.getType().getProperty(PROPERTY_CONSTRAINT_VARIABLE);
	if (ancestor != null) {
		node.setProperty(PROPERTY_CONSTRAINT_VARIABLE, ancestor);
		final Expression expression= node.getInitializer();
		if (expression != null) {
			final ConstraintVariable2 descendant= (ConstraintVariable2) expression.getProperty(PROPERTY_CONSTRAINT_VARIABLE);
			if (descendant != null)
				fModel.createSubtypeConstraint(descendant, ancestor);
		}
	}
}
 

@Override
	public void endVisit(SingleVariableDeclaration node) {
		// used for formal method parameters and catch clauses
		//TODO: extra dimensions?

//		ConstraintVariable2 typeCv= getConstraintVariable(node.getType()); //TODO: who needs this?

//		ConstraintVariable2 nameCv;
//		switch (node.getParent().getNodeType()) {
//			case ASTNode.METHOD_DECLARATION :
//				MethodDeclaration parent= (MethodDeclaration) node.getParent();
//				int index= parent.parameters().indexOf(node);
//				nameCv= fTCFactory.makeParameterTypeVariable(parent.resolveBinding(), index, node.getType());
//				//store source range even if variable not used in constraint here. TODO: move to visit(MethodDeclaration)?
//				break;
//			case ASTNode.CATCH_CLAUSE :
//				nameCv= fTCFactory.makeVariableVariable(node.resolveBinding());
//
//				break;
//			default:
//				unexpectedNode(node.getParent());
//		}
//		setConstraintVariable(node, nameCv);

		//TODO: Move this into visit(SimpleName) or leave it here?
//		ExpressionVariable2 name= fTCFactory.makeExpressionVariable(node.getName());
//		TypeVariable2 type= fTCFactory.makeTypeVariable(node.getType());
//		ITypeConstraint2[] nameEqualsType= fTCFactory.createEqualsConstraint(name, type);
//		addConstraints(nameEqualsType);

		//TODO: When can a SingleVariableDeclaration have an initializer? Never up to Java 1.5?
		Expression initializer= node.getInitializer();
		if (initializer == null)
			return;

//		ConstraintVariable2 initializerCv= getConstraintVariable(initializer);
//		ConstraintVariable2 nameCv= getConstraintVariable(node);
		//TODO: check: property has been set in visit(CatchClause), visit(MethodDeclaration), visit(EnhancedForStatament)
		//fTCFactory.createSubtypeConstraint(initializerCv, nameCv); //TODO: not for augment raw container clients
	}
 

@Override
public void endVisit(SingleVariableDeclaration node) {
	if (skipNode(node))
		return;

	IVariableBinding binding= node.resolveBinding();
	LocalFlowInfo nameInfo= null;
	Expression initializer= node.getInitializer();
	if (binding != null && !binding.isField() && initializer != null) {
		nameInfo= new LocalFlowInfo(binding, FlowInfo.WRITE, fFlowContext);
	}
	GenericSequentialFlowInfo info= processSequential(node, node.getType(), initializer);
	info.merge(nameInfo, fFlowContext);
}
 

private static boolean hasSideEffect(SimpleName reference) {
	ASTNode parent= reference.getParent();
	while (parent instanceof QualifiedName) {
		parent= parent.getParent();
	}
	if (parent instanceof FieldAccess) {
		parent= parent.getParent();
	}

	ASTNode node= null;
	int nameParentType= parent.getNodeType();
	if (nameParentType == ASTNode.ASSIGNMENT) {
		Assignment assignment= (Assignment) parent;
		node= assignment.getRightHandSide();
	} else if (nameParentType == ASTNode.SINGLE_VARIABLE_DECLARATION) {
		SingleVariableDeclaration decl= (SingleVariableDeclaration)parent;
		node= decl.getInitializer();
		if (node == null)
			return false;
	} else if (nameParentType == ASTNode.VARIABLE_DECLARATION_FRAGMENT) {
		node= parent;
	} else {
		return false;
	}

	ArrayList<Expression> sideEffects= new ArrayList<Expression>();
	node.accept(new SideEffectFinder(sideEffects));
	return sideEffects.size() > 0;
}