org.eclipse.jdt.core.dom.ASTNode#getParent ( )源码实例Demo

private RefactoringStatus createExceptionInfoList() {
	if (fExceptionInfos == null || fExceptionInfos.isEmpty()) {
		fExceptionInfos= new ArrayList<ExceptionInfo>(0);
		try {
			ASTNode nameNode= NodeFinder.perform(fBaseCuRewrite.getRoot(), fMethod.getNameRange());
			if (nameNode == null || !(nameNode instanceof Name) || !(nameNode.getParent() instanceof MethodDeclaration))
				return null;
			MethodDeclaration methodDeclaration= (MethodDeclaration) nameNode.getParent();
			List<Type> exceptions= methodDeclaration.thrownExceptionTypes();
			List<ExceptionInfo> result= new ArrayList<ExceptionInfo>(exceptions.size());
			for (int i= 0; i < exceptions.size(); i++) {
				Type type= exceptions.get(i);
				ITypeBinding typeBinding= type.resolveBinding();
				if (typeBinding == null)
					return RefactoringStatus.createFatalErrorStatus(RefactoringCoreMessages.ChangeSignatureRefactoring_no_exception_binding);
				IJavaElement element= typeBinding.getJavaElement();
				result.add(ExceptionInfo.createInfoForOldException(element, typeBinding));
			}
			fExceptionInfos= result;
		} catch (JavaModelException e) {
			JavaPlugin.log(e);
		}
	}
	return null;
}
 

public static BodyDeclaration findParentBodyDeclaration(ASTNode node, boolean treatModifiersOutside) {
	StructuralPropertyDescriptor lastLocation= null;

	while (node != null) {
		if (node instanceof BodyDeclaration) {
			BodyDeclaration decl= (BodyDeclaration) node;
			if (!treatModifiersOutside || lastLocation != decl.getModifiersProperty()) {
				return decl;
			}
			treatModifiersOutside= false;
		}
		lastLocation= node.getLocationInParent();
		node= node.getParent();
	}
	return (BodyDeclaration) node;
}
 

private static <T extends ASTNode> T getEnclosingHeader(ASTNode node, Class<T> headerType, StructuralPropertyDescriptor... headerProperties) {
	if (headerType.isInstance(node)) {
		return headerType.cast(node);
	}

	while (node != null) {
		ASTNode parent = node.getParent();
		if (headerType.isInstance(parent)) {
			StructuralPropertyDescriptor locationInParent = node.getLocationInParent();
			for (StructuralPropertyDescriptor property : headerProperties) {
				if (locationInParent == property) {
					return headerType.cast(parent);
				}
			}
			return null;
		}
		node = parent;
	}
	return null;
}
 

public static String qualifiedName(TypeDeclaration decl) {
	String name = decl.getName().getIdentifier();
	ASTNode parent = decl.getParent();
	// resolve full name e.g.: A.B
	while (parent != null && parent.getClass() == TypeDeclaration.class) {
		name = ((TypeDeclaration) parent).getName().getIdentifier() + "." + name;
		parent = parent.getParent();
	}
	// resolve fully qualified name e.g.: some.package.A.B
	if (decl.getRoot().getClass() == CompilationUnit.class) {
		CompilationUnit root = (CompilationUnit) decl.getRoot();
		if (root.getPackage() != null) {
			PackageDeclaration pack = root.getPackage();
			name = pack.getName().getFullyQualifiedName() + "." + name;
		}
	}
	return name;
}
 

/**
 * Finds the ancestor type of <code>node</code> (includes <code>node</code> in the search).
 *
 * @param node the node to start the search from, can be <code>null</code>
 * @param treatModifiersOutside if set, modifiers are not part of their type, but of the type's
 *            parent
 * @return returns the ancestor type of <code>node</code> (AbstractTypeDeclaration or
 *         AnonymousTypeDeclaration) if any (including <code>node</code>), <code>null</code>
 *         otherwise
 */
public static ASTNode findParentType(ASTNode node, boolean treatModifiersOutside) {
	StructuralPropertyDescriptor lastLocation= null;

	while (node != null) {
		if (node instanceof AbstractTypeDeclaration) {
			AbstractTypeDeclaration decl= (AbstractTypeDeclaration) node;
			if (!treatModifiersOutside || lastLocation != decl.getModifiersProperty()) {
				return decl;
			}
		} else if (node instanceof AnonymousClassDeclaration) {
			return node;
		}
		lastLocation= node.getLocationInParent();
		node= node.getParent();
	}
	return null;
}
 

private ASTNode getEnclosingBodyNode() throws JavaModelException {
	ASTNode node = getSelectedExpression().getAssociatedNode();

	// expression must be in a method, lambda or initializer body
	// make sure it is not in method or parameter annotation
	StructuralPropertyDescriptor location = null;
	while (node != null && !(node instanceof BodyDeclaration)) {
		location = node.getLocationInParent();
		node = node.getParent();
		if (node instanceof LambdaExpression) {
			break;
		}
	}
	if (location == MethodDeclaration.BODY_PROPERTY || location == Initializer.BODY_PROPERTY || (location == LambdaExpression.BODY_PROPERTY && ((LambdaExpression) node).resolveMethodBinding() != null)) {
		return (ASTNode) node.getStructuralProperty(location);
	}
	return null;
}
 

public static boolean isInsideModifiers(ASTNode node) {
	while (node != null && !(node instanceof BodyDeclaration)) {
		if (node instanceof Annotation) {
			return true;
		}
		node= node.getParent();
	}
	return false;
}
 

private static Expression getBooleanExpression(ASTNode node) {
	if (!(node instanceof Expression)) {
		return null;
	}

	// check if the node is a location where it can be negated
	StructuralPropertyDescriptor locationInParent= node.getLocationInParent();
	if (locationInParent == QualifiedName.NAME_PROPERTY) {
		node= node.getParent();
		locationInParent= node.getLocationInParent();
	}
	while (locationInParent == ParenthesizedExpression.EXPRESSION_PROPERTY) {
		node= node.getParent();
		locationInParent= node.getLocationInParent();
	}
	Expression expression= (Expression) node;
	if (!isBoolean(expression)) {
		return null;
	}
	if (expression.getParent() instanceof InfixExpression) {
		return expression;
	}
	if (locationInParent == Assignment.RIGHT_HAND_SIDE_PROPERTY || locationInParent == IfStatement.EXPRESSION_PROPERTY
			|| locationInParent == WhileStatement.EXPRESSION_PROPERTY || locationInParent == DoStatement.EXPRESSION_PROPERTY
			|| locationInParent == ReturnStatement.EXPRESSION_PROPERTY || locationInParent == ForStatement.EXPRESSION_PROPERTY
			|| locationInParent == AssertStatement.EXPRESSION_PROPERTY || locationInParent == MethodInvocation.ARGUMENTS_PROPERTY
			|| locationInParent == ConstructorInvocation.ARGUMENTS_PROPERTY || locationInParent == SuperMethodInvocation.ARGUMENTS_PROPERTY
			|| locationInParent == EnumConstantDeclaration.ARGUMENTS_PROPERTY || locationInParent == SuperConstructorInvocation.ARGUMENTS_PROPERTY
			|| locationInParent == ClassInstanceCreation.ARGUMENTS_PROPERTY || locationInParent == ConditionalExpression.EXPRESSION_PROPERTY
			|| locationInParent == PrefixExpression.OPERAND_PROPERTY) {
		return expression;
	}
	return null;
}
 

private void initializeDuplicates() {
	ASTNode start= fAnalyzer.getEnclosingBodyDeclaration();
	while (!(start instanceof AbstractTypeDeclaration)) {
		start= start.getParent();
	}

	fDuplicates= SnippetFinder.perform(start, fAnalyzer.getSelectedNodes());
	fReplaceDuplicates= fDuplicates.length > 0 && ! fAnalyzer.isLiteralNodeSelected();
}
 

@Override
public void preVisit(final ASTNode node) {
	if (node.getParent() != null) {
		variables.putAll(node, variables.get(node.getParent()));
	}
	variables.putAll(node, variableDeclarations.get(node));
	super.preVisit(node);
}
 

private void getNotYetMappedAncestors(ASTNode node, ArrayList<ASTNode> ancestors) {
	ASTNode p = node.getParent();
	if (treeMap.get(p).isEmpty()) {
		ancestors.add(p);
		getNotYetMappedAncestors(p, ancestors);
	}
}
 

private boolean matchesLocationInEnclosingBodyDecl(BodyDeclaration originalEnclosingBodyDeclaration, BodyDeclaration duplicateEnclosingBodyDeclaration, VariableDeclaration originalReturnNode, VariableDeclaration duplicateReturnNode) {
	boolean matches = true;
	ASTNode original = originalReturnNode;
	ASTNode dupliacte = duplicateReturnNode;

	// walk up the parent chains to check if the location of the return nodes in their respective parent chains is same
	do {
		ASTNode originalParent = original.getParent();
		ASTNode duplicateParent = dupliacte.getParent();
		StructuralPropertyDescriptor originalLoc = original.getLocationInParent();
		StructuralPropertyDescriptor duplicateLoc = dupliacte.getLocationInParent();

		if (originalParent != null && duplicateParent != null && originalLoc.getNodeClass().equals(duplicateLoc.getNodeClass()) && originalLoc.getId().equals(duplicateLoc.getId())) {
			if (originalLoc.isChildListProperty() && duplicateLoc.isChildListProperty()) {
				int indexOfOriginal = ((List<?>) originalParent.getStructuralProperty(originalLoc)).indexOf(original);
				int indexOfDuplicate = ((List<?>) duplicateParent.getStructuralProperty(duplicateLoc)).indexOf(dupliacte);
				if (indexOfOriginal != indexOfDuplicate) {
					matches = false;
					break;
				}
			}
		} else {
			matches = false;
			break;
		}

		original = originalParent;
		dupliacte = duplicateParent;

		if ((originalEnclosingBodyDeclaration.equals(original) && !duplicateEnclosingBodyDeclaration.equals(dupliacte)) || (!originalEnclosingBodyDeclaration.equals(original) && duplicateEnclosingBodyDeclaration.equals(dupliacte))) {
			matches = false;
			break;
		}
	} while (!originalEnclosingBodyDeclaration.equals(original) && !duplicateEnclosingBodyDeclaration.equals(dupliacte));

	return matches;
}
 

private static boolean canReplace(IASTFragment fragment) {
	ASTNode node = fragment.getAssociatedNode();
	ASTNode parent = node.getParent();
	if (parent instanceof VariableDeclarationFragment) {
		VariableDeclarationFragment vdf = (VariableDeclarationFragment) parent;
		if (node.equals(vdf.getName())) {
			return false;
		}
	}
	if (isMethodParameter(node)) {
		return false;
	}
	if (isThrowableInCatchBlock(node)) {
		return false;
	}
	if (parent instanceof ExpressionStatement) {
		return false;
	}
	if (parent instanceof LambdaExpression) {
		return false;
	}
	if (isLeftValue(node)) {
		return false;
	}
	if (isReferringToLocalVariableFromFor((Expression) node)) {
		return false;
	}
	if (isUsedInForInitializerOrUpdater((Expression) node)) {
		return false;
	}
	if (parent instanceof SwitchCase) {
		return false;
	}
	return true;
}
 

private boolean isDeclaredInLambdaExpression() throws JavaModelException {
	ASTNode node = getSelectedExpression().getAssociatedNode();
	while (node != null && !(node instanceof BodyDeclaration)) {
		node = node.getParent();
		if (node instanceof LambdaExpression) {
			return true;
		}
	}

	return false;
}
 

public static boolean isWriteAccess(Name selectedNode) {
	ASTNode curr= selectedNode;
	ASTNode parent= curr.getParent();
	while (parent != null) {
		switch (parent.getNodeType()) {
			case ASTNode.QUALIFIED_NAME:
				if (((QualifiedName) parent).getQualifier() == curr) {
					return false;
				}
				break;
			case ASTNode.FIELD_ACCESS:
				if (((FieldAccess) parent).getExpression() == curr) {
					return false;
				}
				break;
			case ASTNode.SUPER_FIELD_ACCESS:
				break;
			case ASTNode.ASSIGNMENT:
				return ((Assignment) parent).getLeftHandSide() == curr;
			case ASTNode.VARIABLE_DECLARATION_FRAGMENT:
			case ASTNode.SINGLE_VARIABLE_DECLARATION:
				return ((VariableDeclaration) parent).getName() == curr;
			case ASTNode.POSTFIX_EXPRESSION:
				return true;
			case ASTNode.PREFIX_EXPRESSION:
				PrefixExpression.Operator op= ((PrefixExpression) parent).getOperator();
				return op == PrefixExpression.Operator.DECREMENT || op == PrefixExpression.Operator.INCREMENT;
			default:
				return false;
		}

		curr= parent;
		parent= curr.getParent();
	}
	return false;
}
 

private static boolean getAssignParamToFieldProposals(IInvocationContext context, ASTNode node, Collection<ChangeCorrectionProposal> resultingCollections) {
	node = ASTNodes.getNormalizedNode(node);
	ASTNode parent = node.getParent();
	if (!(parent instanceof SingleVariableDeclaration) || !(parent.getParent() instanceof MethodDeclaration)) {
		return false;
	}
	SingleVariableDeclaration paramDecl = (SingleVariableDeclaration) parent;
	IVariableBinding binding = paramDecl.resolveBinding();

	MethodDeclaration methodDecl = (MethodDeclaration) parent.getParent();
	if (binding == null || methodDecl.getBody() == null) {
		return false;
	}
	ITypeBinding typeBinding = binding.getType();
	if (typeBinding == null) {
		return false;
	}

	if (resultingCollections == null) {
		return true;
	}

	ITypeBinding parentType = Bindings.getBindingOfParentType(node);
	if (parentType != null) {
		if (parentType.isInterface()) {
			return false;
		}
		// assign to existing fields
		CompilationUnit root = context.getASTRoot();
		IVariableBinding[] declaredFields = parentType.getDeclaredFields();
		boolean isStaticContext = ASTResolving.isInStaticContext(node);
		for (int i = 0; i < declaredFields.length; i++) {
			IVariableBinding curr = declaredFields[i];
			if (isStaticContext == Modifier.isStatic(curr.getModifiers()) && typeBinding.isAssignmentCompatible(curr.getType())) {
				ASTNode fieldDeclFrag = root.findDeclaringNode(curr);
				if (fieldDeclFrag instanceof VariableDeclarationFragment) {
					VariableDeclarationFragment fragment = (VariableDeclarationFragment) fieldDeclFrag;
					if (fragment.getInitializer() == null) {
						resultingCollections.add(new AssignToVariableAssistProposal(context.getCompilationUnit(), paramDecl, fragment, typeBinding, IProposalRelevance.ASSIGN_PARAM_TO_EXISTING_FIELD));
					}
				}
			}
		}
	}

	AssignToVariableAssistProposal fieldProposal = new AssignToVariableAssistProposal(context.getCompilationUnit(), paramDecl, null, typeBinding, IProposalRelevance.ASSIGN_PARAM_TO_NEW_FIELD);
	resultingCollections.add(fieldProposal);
	return true;
}
 

public boolean needsReturnValue(final ASTNode node) {
  return ((node.getParent() != null) && ((!(node.getParent() instanceof Statement)) || (node.getParent() instanceof ReturnStatement)));
}
 

/**
 * Determines what kind of ASTNode has been selected.
 * @param node the node
 * @return  A non-null String containing an error message
 * is returned if the ChangeTypeRefactoring refactoring cannot be applied to the selected ASTNode.
 * A return value of null indicates a valid selection.
 */
private String determineSelection(ASTNode node) {
	if (node == null) {
		return RefactoringCoreMessages.ChangeTypeRefactoring_invalidSelection;
	} else {

		if (DEBUG) System.out.println("node nodeType= " + node.getClass().getName()); //$NON-NLS-1$
		if (DEBUG) System.out.println("parent nodeType= " + node.getParent().getClass().getName()); //$NON-NLS-1$
		if (DEBUG) System.out.println("GrandParent nodeType= " + node.getParent().getParent().getClass().getName()); //$NON-NLS-1$

		ASTNode parent= node.getParent();
		ASTNode grandParent= parent.getParent();
		if (grandParent == null)
			return nodeTypeNotSupported();

		// adjustment needed if part of a parameterized type is selected
		if (grandParent.getNodeType() == ASTNode.PARAMETERIZED_TYPE){
			node= grandParent;
		}

		// adjustment needed if part of a qualified name is selected
		ASTNode current= null;
		if (node.getNodeType() == ASTNode.QUALIFIED_NAME){
			current= node;
			while (current.getNodeType() == ASTNode.QUALIFIED_NAME){
				current= current.getParent();
			}
			if (current.getNodeType() != ASTNode.SIMPLE_TYPE){
				return nodeTypeNotSupported();
			}
			node= current.getParent();
		} else if (parent.getNodeType() == ASTNode.QUALIFIED_NAME){
			current= parent;
			while (current.getNodeType() == ASTNode.QUALIFIED_NAME){
				current= current.getParent();
			}
			if (current.getNodeType() != ASTNode.SIMPLE_TYPE){
				return nodeTypeNotSupported();
			}
			node= current.getParent();
		}

		fObject= node.getAST().resolveWellKnownType("java.lang.Object"); //$NON-NLS-1$
		switch (node.getNodeType()) {
			case ASTNode.SIMPLE_NAME :
				return simpleNameSelected((SimpleName)node);
			case ASTNode.VARIABLE_DECLARATION_STATEMENT :
				return variableDeclarationStatementSelected((VariableDeclarationStatement) node);
			case ASTNode.FIELD_DECLARATION :
				return fieldDeclarationSelected((FieldDeclaration) node);
			case ASTNode.SINGLE_VARIABLE_DECLARATION :
				return singleVariableDeclarationSelected((SingleVariableDeclaration) node);
			case ASTNode.PARAMETERIZED_TYPE:
				return parameterizedTypeSelected((ParameterizedType) node);
			default :
				return nodeTypeNotSupported();
		}
	}
}
 

private static String getEnclosingType(ASTNode declaration) {
	ASTNode node = declaration == null ? null : declaration.getParent();
	ITypeBinding type = ASTNodes.getEnclosingType(node);
	return type == null ? null : type.getQualifiedName();
}
 

public static Type guessTypeForReference(AST ast, ASTNode node) {
	ASTNode parent= node.getParent();
	while (parent != null) {
		switch (parent.getNodeType()) {
			case ASTNode.VARIABLE_DECLARATION_FRAGMENT:
				if (((VariableDeclarationFragment) parent).getInitializer() == node) {
					return ASTNodeFactory.newType(ast, (VariableDeclaration) parent);
				}
				return null;
			case ASTNode.SINGLE_VARIABLE_DECLARATION:
				if (((VariableDeclarationFragment) parent).getInitializer() == node) {
					return ASTNodeFactory.newType(ast, (VariableDeclaration) parent);
				}
				return null;
			case ASTNode.ARRAY_ACCESS:
				if (!((ArrayAccess) parent).getIndex().equals(node)) {
					Type type = guessTypeForReference(ast, parent);
					if (type != null) {
						return ASTNodeFactory.newArrayType(type);
					}
				}
				return null;
			case ASTNode.FIELD_ACCESS:
				if (node.equals(((FieldAccess) parent).getName())) {
					node = parent;
					parent = parent.getParent();
				} else {
					return null;
				}
				break;
			case ASTNode.SUPER_FIELD_ACCESS:
			case ASTNode.PARENTHESIZED_EXPRESSION:
				node= parent;
				parent= parent.getParent();
				break;
			case ASTNode.QUALIFIED_NAME:
				if (node.equals(((QualifiedName) parent).getName())) {
					node = parent;
					parent = parent.getParent();
				} else {
					return null;
				}
				break;
			default:
				return null;
		}
	}
	return null;
}