com.sun.source.tree.ArrayTypeTree#javax.lang.model.element.NestingKind源码实例Demo

@Override
public List<Fix> run(CompilationInfo info, String diagnosticKey, int offset, TreePath treePath, Data<Void> data) {
    if (treePath == null || !TreeUtilities.CLASS_TREE_KINDS.contains(treePath.getLeaf().getKind())) {
        return null;
    }
    if (treePath.getLeaf().getKind() == Tree.Kind.INTERFACE) {
        return null;
    }
    
    TypeElement type = (TypeElement) info.getTrees().getElement(treePath);
    if (type == null) {
        return null;
    }
    List<Fix> fixes = new ArrayList<Fix>();

    fixes.add(new FixImpl(TreePathHandle.create(treePath, info), false).toEditorFix());
    // fixes.add(new FixImpl(TreePathHandle.create(treePath, info), true));

    if (!type.getNestingKind().equals(NestingKind.ANONYMOUS)) {
        // add SuppressWarning only to non-anonymous class
        fixes.addAll(FixFactory.createSuppressWarnings(info, treePath, SERIAL));
    }

    return fixes;
}
 

public static TargetDescription create(CompilationInfo info, TypeElement type, TreePath path, boolean allowForDuplicates, boolean iface) {
    boolean canStatic = true;
    if (iface) {
        // interface cannot have static methods
        canStatic = false;
    } else {
        if (type.getNestingKind() == NestingKind.ANONYMOUS || 
            type.getNestingKind() == NestingKind.LOCAL ||
            (type.getNestingKind() != NestingKind.TOP_LEVEL && !type.getModifiers().contains(Modifier.STATIC))) {
            canStatic = false;
        }
    }
    return new TargetDescription(Utilities.target2String(type), 
            ElementHandle.create(type), 
            TreePathHandle.create(path, info),
            allowForDuplicates, 
            type.getSimpleName().length() == 0, iface, canStatic);
}
 

private static GeneratedTypeElement newEmulatedType(
    String qualifiedName, ElementKind kind, TypeMirror superclass) {
  int idx = qualifiedName.lastIndexOf('.');
  String packageName = idx < 0 ? "" : qualifiedName.substring(0, idx);
  PackageElement packageElement = new GeneratedPackageElement(packageName);
  return new GeneratedTypeElement(
      qualifiedName.substring(idx + 1), kind, packageElement, superclass, NestingKind.TOP_LEVEL,
      null, false, false);
}
 

@Override
public NestingKind getNestingKind() {
	ReferenceBinding refBinding = (ReferenceBinding)_binding;
	if (refBinding.isAnonymousType()) {
		return NestingKind.ANONYMOUS;
	} else if (refBinding.isLocalType()) {
		return NestingKind.LOCAL;
	} else if (refBinding.isMemberType()) {
		return NestingKind.MEMBER;
	}
	return NestingKind.TOP_LEVEL;
}
 

@Test
public void newType() {
  TypeElement type = model.newType(
      "package foo.bar;",
      "public class MyType {",
      "  public void doNothing() { }",
      "}");
  assertEquals(ElementKind.CLASS, type.getKind());
  assertEquals(NestingKind.TOP_LEVEL, type.getNestingKind());
  assertEquals("MyType", type.getSimpleName().toString());
  assertEquals("foo.bar.MyType", type.toString());
  assertEquals("doNothing",
      getOnlyElement(methodsIn(type.getEnclosedElements())).getSimpleName().toString());
}
 

void validateEnclosingElement(Element element) {
  TypeElement typeElement = ctx.getMoreElements().toTypeElement(element);
  if (typeElement == null) {
    return;
  }
  String simpleName = typeElement.getSimpleName().toString();
  if (simpleName.contains(Constants.BINARY_NAME_DELIMITER)
      || simpleName.contains(Constants.TYPE_NAME_DELIMITER)) {
    throw new AptException(
        Message.DOMA4277, typeElement, new Object[] {typeElement.getQualifiedName()});
  }
  NestingKind nestingKind = typeElement.getNestingKind();
  if (nestingKind == NestingKind.TOP_LEVEL) {
    return;
  } else if (nestingKind == NestingKind.MEMBER) {
    Set<Modifier> modifiers = typeElement.getModifiers();
    if (modifiers.containsAll(Arrays.asList(Modifier.STATIC, Modifier.PUBLIC))) {
      validateEnclosingElement(typeElement.getEnclosingElement());
    } else {
      throw new AptException(
          Message.DOMA4275, typeElement, new Object[] {typeElement.getQualifiedName()});
    }
  } else {
    throw new AptException(
        Message.DOMA4276, typeElement, new Object[] {typeElement.getQualifiedName()});
  }
}
 

/** Is t an anonymous inner class or a lambda? */
private boolean isValidTreeType(Tree t) {
  if (t instanceof LambdaExpressionTree) {
    return true;
  }
  if (t instanceof ClassTree) {
    NestingKind nestingKind = ASTHelpers.getSymbol((ClassTree) t).getNestingKind();
    return nestingKind.equals(NestingKind.ANONYMOUS) || nestingKind.equals(NestingKind.LOCAL);
  }
  return false;
}
 

public ClassInfo asClassInfo() {
	String fqpn = fullyQualifiedPackageName();
	String className;
	if (enclosingClass.getNestingKind() != NestingKind.TOP_LEVEL) {
		// in case of the static class, we get all the nested classes and
		// replace '.' with '$'
		className = CharMatcher.is('.')
				.replaceFrom(fullyQualifiedName().replace(fqpn + ".", ""), '$');
	} else {
		className = simpleName();
	}
	return new ClassInfo(fqpn, className);
}
 

@Test
public void newType_annotation() {
  TypeElement type = model.newType(
      "package foo.bar;",
      "public @interface MyType {",
      "  String param();",
      "}");
  assertEquals(ElementKind.ANNOTATION_TYPE, type.getKind());
  assertEquals(NestingKind.TOP_LEVEL, type.getNestingKind());
  assertEquals("MyType", type.getSimpleName().toString());
  assertEquals("foo.bar.MyType", type.toString());
  assertEquals("param",
      getOnlyElement(methodsIn(type.getEnclosedElements())).getSimpleName().toString());
}
 

@DefinedBy(Api.LANGUAGE_MODEL)
public NestingKind getNestingKind() {
    complete();
    if (owner.kind == PCK)
        return NestingKind.TOP_LEVEL;
    else if (name.isEmpty())
        return NestingKind.ANONYMOUS;
    else if (owner.kind == MTH)
        return NestingKind.LOCAL;
    else
        return NestingKind.MEMBER;
}
 

@Override
public NestingKind getNestingKind() {
  // We'll never need to infer local or anonymous classes, so there are only two options left
  // and we can tell the difference:
  if (getEnclosingElement() instanceof InferredTypeElement) {
    return NestingKind.MEMBER;
  }

  return NestingKind.TOP_LEVEL;
}
 

private ReplaceConstructorWithBuilderUI(TreePathHandle constructor, CompilationInfo info) {
    this.refactoring = new ReplaceConstructorWithBuilderRefactoring(constructor);
    ExecutableElement contructorElement = (ExecutableElement) constructor.resolveElement(info);
    this.name = contructorElement.getSimpleName().toString();
    MethodTree constTree = (MethodTree) constructor.resolve(info).getLeaf();
    paramaterNames = new ArrayList<String>();
    parameterTypes = new ArrayList<String>();
    parameterTypeVars = new ArrayList<Boolean>();
    boolean varargs = contructorElement.isVarArgs();
    List<? extends VariableElement> parameterElements = contructorElement.getParameters();
    List<? extends VariableTree> parameters = constTree.getParameters();
    for (int i = 0; i < parameters.size(); i++) {
        VariableTree var = parameters.get(i);
        paramaterNames.add(var.getName().toString());
        String type = contructorElement.getParameters().get(i).asType().toString();
        if(varargs && i+1 == parameters.size()) {
            if(var.getType().getKind() == Tree.Kind.ARRAY_TYPE) {
                ArrayTypeTree att = (ArrayTypeTree) var.getType();
                type = att.getType().toString();
                type += "..."; //NOI18N
            }
        }
        parameterTypes.add(type);
        parameterTypeVars.add(parameterElements.get(i).asType().getKind() == TypeKind.TYPEVAR);
    }
    TypeElement typeEl = (TypeElement) contructorElement.getEnclosingElement();
    if(typeEl.getNestingKind() != NestingKind.TOP_LEVEL) {
        PackageElement packageOf = info.getElements().getPackageOf(typeEl);
        builderFQN = packageOf.toString() + "." + typeEl.getSimpleName().toString();
    } else {
        builderFQN = typeEl.getQualifiedName().toString();
    }
    buildMethodName = "create" + typeEl.getSimpleName();
}
 

@Override
public Description matchClass(ClassTree tree, VisitorState state) {
  // check if the class is excluded according to the filter
  // if so, set the flag to match within the class to false
  // NOTE: for this mechanism to work, we rely on the enclosing ClassTree
  // always being visited before code within that class.  We also
  // assume that a single checker object is not being
  // used from multiple threads
  Symbol.ClassSymbol classSymbol = ASTHelpers.getSymbol(tree);
  // we don't want to update the flag for nested classes.
  // ideally we would keep a stack of flags to handle nested types,
  // but this is not easy within the Error Prone APIs
  NestingKind nestingKind = classSymbol.getNestingKind();
  if (!nestingKind.isNested()) {
    matchWithinClass = !isExcludedClass(classSymbol);
    // since we are processing a new top-level class, invalidate any cached
    // results for previous classes
    handler.onMatchTopLevelClass(this, tree, state, classSymbol);
    getNullnessAnalysis(state).invalidateCaches();
    initTree2PrevFieldInit.clear();
    class2Entities.clear();
    class2ConstructorUninit.clear();
    computedNullnessMap.clear();
    EnclosingEnvironmentNullness.instance(state.context).clear();
  }
  if (matchWithinClass) {
    // we need to update the environment before checking field initialization, as the latter
    // may run dataflow analysis
    if (nestingKind.equals(NestingKind.LOCAL) || nestingKind.equals(NestingKind.ANONYMOUS)) {
      updateEnvironmentMapping(tree, state);
    }
    checkFieldInitialization(tree, state);
  }
  return Description.NO_MATCH;
}
 

private static boolean enclosingClassValid(ProcessorContext context, Element element) {
	Element enclosingElement = element.getEnclosingElement();
	while (enclosingElement != null) {
		// skip until we find a class
		if (!enclosingElement.getKind().equals(ElementKind.CLASS))
			break;

		if (!enclosingElement.getKind().equals(ElementKind.CLASS)) {
			context.messager().printMessage(Kind.ERROR,
					"enclosing element(" + enclosingElement.toString() + ") is not a class",
					element);
			return false;
		}

		TypeElement enclosingClass = (TypeElement) enclosingElement;

		// protected, package-private, and public all allow same package
		// access
		if (enclosingClass.getModifiers().contains(Modifier.PRIVATE)) {
			context.messager().printMessage(Kind.ERROR,
					"enclosing class (" + enclosingElement.toString() + ") cannot be private",
					element);
			return false;
		}

		if (enclosingClass.getNestingKind() != NestingKind.TOP_LEVEL
				&& !enclosingClass.getModifiers().contains(Modifier.STATIC)) {
			context.messager().printMessage(Kind.ERROR,
					"enclosing class is nested but not static", element);
			return false;
		}
		enclosingElement = enclosingClass.getEnclosingElement();
	}

	return true;
}
 

private void validateEnclosingElement(Element element) {
  TypeElement typeElement = ctx.getMoreElements().toTypeElement(element);
  if (typeElement == null) {
    return;
  }
  String simpleName = typeElement.getSimpleName().toString();
  if (simpleName.contains(Constants.BINARY_NAME_DELIMITER)
      || simpleName.contains(Constants.TYPE_NAME_DELIMITER)) {
    throw new AptException(
        Message.DOMA4280, typeElement, new Object[] {typeElement.getQualifiedName()});
  }
  NestingKind nestingKind = typeElement.getNestingKind();
  if (nestingKind == NestingKind.TOP_LEVEL) {
    return;
  } else if (nestingKind == NestingKind.MEMBER) {
    Set<Modifier> modifiers = typeElement.getModifiers();
    if (modifiers.containsAll(Arrays.asList(Modifier.STATIC, Modifier.PUBLIC))) {
      validateEnclosingElement(typeElement.getEnclosingElement());
    } else {
      throw new AptException(
          Message.DOMA4278, typeElement, new Object[] {typeElement.getQualifiedName()});
    }
  } else {
    throw new AptException(
        Message.DOMA4279, typeElement, new Object[] {typeElement.getQualifiedName()});
  }
}
 

public static boolean isAnonymousType(TypeMirror type) {
    if (type.getKind() == TypeKind.DECLARED) {
        DeclaredType dt = (DeclaredType) type;
        TypeElement typeElem = (TypeElement) dt.asElement();
        if (typeElem.getNestingKind() == NestingKind.ANONYMOUS) {
            return true;
        }
    }
    return false;
}
 

public LambdaTypeElement(
    String name, Element enclosingElement, TypeMirror superclass, boolean isWeakOuter) {
  super(name, ElementKind.CLASS, enclosingElement, superclass, NestingKind.ANONYMOUS, null,
        false, false);
  this.isWeakOuter = isWeakOuter;
  addModifiers(Modifier.PRIVATE);
}
 

public NestingKind getNestingKind() {
    return file.getNestingKind();
}
 

@Override
public NestingKind getNestingKind() {
	return delegate.getNestingKind();
}
 

@Override
public NestingKind getNestingKind() {
	return null;
}
 

public NestingKind getNestingKind() {
    return javaFileObject.getNestingKind();
}
 

public NestingKind getNestingKind() {
    return javaFileObject.getNestingKind();
}
 

@Override
public NestingKind getNestingKind() {
    return null;
}
 

public NestingKind getNestingKind() {
    return file.getNestingKind();
}
 

public NestingKind getNestingKind() {
    return delegate.getNestingKind();
}
 

public NestingKind getNestingKind() {
    return javaFileObject.getNestingKind();
}
 

@DefinedBy(Api.COMPILER)
public NestingKind getNestingKind() {
    return javaFileObject.getNestingKind();
}
 

@Override
public NestingKind getNestingKind() {
    return null;
}
 

@Override
@Nullable
public NestingKind getNestingKind() {
  return null;
}
 

public static boolean isAnonymous(TypeElement type) {
  return type.getNestingKind() == NestingKind.ANONYMOUS;
}