Examples of com.google.dart.engine.element.Element

com.google.dart.engine.element.Element
The interface {@code Element} defines the behavior common to all of the elements in the elementmodel. Generally speaking, the element model is a semantic model of the program that represents things that are declared with a name and hence can be referenced elsewhere in the code.
There are two exceptions to the general case. First, there are elements in the element model that are created for the convenience of various kinds of analysis but that do not have any corresponding declaration within the source code. Such elements are marked as being synthetic. Examples of synthetic elements include
- default constructors in classes that do not define any explicit constructors,
- getters and setters that are induced by explicit field declarations,
- fields that are induced by explicit declarations of getters and setters, and
- functions representing the initialization expression for a variable.
Second, there are elements in the element model that do not have a name. These correspond to unnamed functions and exist in order to more accurately represent the semantic structure of the program. @coverage dart.engine.element

  private void validateInitializerExpression(final ParameterElement[] parameterElements,
      Expression expression) {
    EvaluationResultImpl result = expression.accept(new ConstantVisitor(typeProvider) {
      @Override
      public EvaluationResultImpl visitSimpleIdentifier(SimpleIdentifier node) {
        Element element = node.getStaticElement();
        for (ParameterElement parameterElement : parameterElements) {
          if (parameterElement == element && parameterElement != null) {
            Type type = parameterElement.getType();
            if (type != null) {
              if (type.isDynamic()) {

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   * @param expression the expression whose element is to be returned
   * @return the variable element represented by the expression
   */
  public static VariableElement getVariableElement(Expression expression) {
    if (expression instanceof Identifier) {
      Element element = ((Identifier) expression).getStaticElement();
      if (element instanceof VariableElement) {
        return (VariableElement) element;
      }
    }
    return null;

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  @Override
  public Void visitBreakStatement(BreakStatement node) {
    SimpleIdentifier labelNode = node.getLabel();
    if (labelNode != null) {
      Element labelElement = labelNode.getStaticElement();
      if (labelElement instanceof LabelElementImpl
          && ((LabelElementImpl) labelElement).isOnSwitchMember()) {
        errorReporter.reportErrorForNode(ResolverErrorCode.BREAK_LABEL_ON_SWITCH_MEMBER, labelNode);
      }
    }

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  @Override
  public Void visitConstructorFieldInitializer(ConstructorFieldInitializer node) {
    isInConstructorInitializer = true;
    try {
      SimpleIdentifier fieldName = node.getFieldName();
      Element staticElement = fieldName.getStaticElement();
      checkForInvalidField(node, fieldName, staticElement);
      checkForFieldInitializerNotAssignable(node, staticElement);
      return super.visitConstructorFieldInitializer(node);
    } finally {
      isInConstructorInitializer = false;

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  @Override
  public Void visitContinueStatement(ContinueStatement node) {
    SimpleIdentifier labelNode = node.getLabel();
    if (labelNode != null) {
      Element labelElement = labelNode.getStaticElement();
      if (labelElement instanceof LabelElementImpl
          && ((LabelElementImpl) labelElement).isOnSwitchStatement()) {
        errorReporter.reportErrorForNode(ResolverErrorCode.CONTINUE_LABEL_ON_SWITCH, labelNode);
      }
    }

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        return false;
      }
      if (constructorInitializer instanceof ConstructorFieldInitializer) {
        ConstructorFieldInitializer constructorFieldInitializer = (ConstructorFieldInitializer) constructorInitializer;
        SimpleIdentifier fieldName = constructorFieldInitializer.getFieldName();
        Element element = fieldName.getStaticElement();
        if (element instanceof FieldElement) {
          FieldElement fieldElement = (FieldElement) element;
          INIT_STATE state = fieldElementsMap.get(fieldElement);
          if (state == INIT_STATE.NOT_INIT) {
            fieldElementsMap.put(fieldElement, INIT_STATE.INIT_IN_INITIALIZERS);

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    // check exported names
    Namespace namespace = new NamespaceBuilder().createExportNamespaceForDirective(exportElement);
    Map<String, Element> definedNames = namespace.getDefinedNames();
    for (Entry<String, Element> definedEntry : definedNames.entrySet()) {
      String name = definedEntry.getKey();
      Element element = definedEntry.getValue();
      Element prevElement = exportedElements.get(name);
      if (element != null && prevElement != null && !prevElement.equals(element)) {
        errorReporter.reportErrorForNode(
            CompileTimeErrorCode.AMBIGUOUS_EXPORT,
            node,
            name,
            prevElement.getLibrary().getDefiningCompilationUnit().getDisplayName(),
            element.getLibrary().getDefiningCompilationUnit().getDisplayName());
        return true;
      } else {
        exportedElements.put(name, element);
      }

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   * @see StaticWarningCode#ASSIGNMENT_TO_FINAL
   * @see StaticWarningCode#ASSIGNMENT_TO_METHOD
   */
  private boolean checkForAssignmentToFinal(Expression expression) {
    // prepare element
    Element element = null;
    AstNode highlightedNode = expression;
    if (expression instanceof Identifier) {
      element = ((Identifier) expression).getStaticElement();
      if (expression instanceof PrefixedIdentifier) {
        highlightedNode = ((PrefixedIdentifier) expression).getIdentifier();

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        // Do lookups in the enclosing class (and the inherited member) if the member is a method or
        // a setter for StaticWarningCode.CONFLICTING_INSTANCE_METHOD_SETTER warning.
        if (isMethod) {
          String setterName = name.getName() + "=";
          Element enclosingElementOfSetter = null;
          ClassMember conflictingSetter = memberHashMap.get(setterName);
          if (conflictingSetter != null) {
            enclosingElementOfSetter = conflictingSetter.getElement().getEnclosingElement();
          } else {
            ExecutableElement elementFromInheritance = inheritanceManager.lookupInheritance(
                enclosingClass,
                setterName);
            if (elementFromInheritance != null) {
              enclosingElementOfSetter = elementFromInheritance.getEnclosingElement();
            }
          }
          if (enclosingElementOfSetter != null) {
            // report problem
            errorReporter.reportErrorForNode(
                StaticWarningCode.CONFLICTING_INSTANCE_METHOD_SETTER,
                name,
                enclosingClass.getDisplayName(),
                name.getName(),
                enclosingElementOfSetter.getDisplayName());
            foundError |= true;
            addThisMemberToTheMap = false;
          }
        } else if (isSetter) {
          String methodName = name.getName();

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        Directive directive = directives.get(i);
        if (directive instanceof ImportDirective) {
          ImportDirective importDirective = (ImportDirective) directive;
          SimpleIdentifier prefix = importDirective.getPrefix();
          if (prefix != null) {
            Element element = prefix.getStaticElement();
            if (element instanceof PrefixElement) {
              PrefixElement prefixElement = (PrefixElement) element;
              ArrayList<ImportDirective> elements = prefixToDirectivesMap.get(prefixElement);
              if (elements == null) {
                elements = new ArrayList<ImportDirective>();

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com.google.dart.engine.ast.PrefixedIdentifier

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