javax.lang.model.element.ElementKind#PACKAGE源码实例Demo

private ExpressionTree qualIdentFor(Element e) {
    TreeMaker tm = copy.getTreeMaker();
    if (e.getKind() == ElementKind.PACKAGE) {
        String name = ((PackageElement)e).getQualifiedName().toString();
        if (e instanceof Symbol) {
            int lastDot = name.lastIndexOf('.');
            if (lastDot < 0)
                return tm.Identifier(e);
            return tm.MemberSelect(qualIdentFor(name.substring(0, lastDot)), e);
        }
        return qualIdentFor(name);
    }
    Element ee = e.getEnclosingElement();
    if (e instanceof Symbol)
        return ee.getSimpleName().length() > 0 ? tm.MemberSelect(qualIdentFor(ee), e) : tm.Identifier(e);
    return ee.getSimpleName().length() > 0 ? tm.MemberSelect(qualIdentFor(ee), e.getSimpleName()) : tm.Identifier(e.getSimpleName());
}
 

private String fqnFor(Tree t) {
    Element el = ASTService.getElementImpl(t);

    if (el != null) {
        if (el.getKind().isClass() || el.getKind().isInterface() || el.getKind() == ElementKind.PACKAGE) {
            return ((QualifiedNameable) el).getQualifiedName().toString();
        } else {
            Logger.getLogger(ElementOverlay.class.getName()).log(Level.SEVERE, "Not a QualifiedNameable: {0}", el);
            return null;
        }
    } else if (t instanceof QualIdentTree) {
        return ((QualIdentTree) t).getFQN();
    } else if (t.getKind() == Kind.PARAMETERIZED_TYPE) {
        return fqnFor(((ParameterizedTypeTree) t).getType());
    } else {
        Logger.getLogger(ElementOverlay.class.getName()).log(Level.FINE, "No element and no QualIdent");
        return null;
    }
}
 

/**
 * Returns a {@link QualifiedName} for {@code type}.
 */
public static QualifiedName of(TypeElement type) {
  switch (type.getNestingKind()) {
    case TOP_LEVEL:
      PackageElement pkg = (PackageElement) type.getEnclosingElement();
      return QualifiedName.of(pkg.getQualifiedName().toString(), type.getSimpleName().toString());

    case MEMBER:
      List<String> reversedNames = new ArrayList<String>();
      reversedNames.add(type.getSimpleName().toString());
      Element parent = type.getEnclosingElement();
      while (parent.getKind() != ElementKind.PACKAGE) {
        reversedNames.add(parent.getSimpleName().toString());
        parent = parent.getEnclosingElement();
      }
      return new QualifiedName(
          ((PackageElement) parent).getQualifiedName().toString(),
          ImmutableList.copyOf(Lists.reverse(reversedNames)));

    default:
      throw new IllegalArgumentException("Cannot determine qualified name of " + type);
  }
}
 

private void addAllElements(Element rootElement, Map<Path, Element> elements) {
  if (rootElement.getKind() == ElementKind.PACKAGE) {
    PackageElement packageElement = (PackageElement) rootElement;
    if (!packageElement.getAnnotationMirrors().isEmpty()) {
      elements.put(
          getRelativePathToClass(packageElement.getQualifiedName() + ".package-info"),
          packageElement);
    }
  }

  if (!rootElement.getKind().isClass() && !rootElement.getKind().isInterface()) {
    return;
  }

  TypeElement typeElement = (TypeElement) rootElement;
  elements.put(getRelativePath(typeElement), typeElement);
  for (Element enclosed : typeElement.getEnclosedElements()) {
    addAllElements(enclosed, elements);
  }
}
 

@Nullable
private TypeElement validated(Element element) {
  Element enclosingElement = element.getEnclosingElement();

  if (element.getKind() == ElementKind.CLASS
      && element.getModifiers().contains(Modifier.PUBLIC)
      && enclosingElement != null) {

    if (enclosingElement.getKind() == ElementKind.PACKAGE
        && !element.getModifiers().contains(Modifier.ABSTRACT)
        && !((PackageElement) enclosingElement).isUnnamed()) {
      return (TypeElement) element;
    }

    if (enclosingElement.getKind() == ElementKind.CLASS
       && element.getModifiers().contains(Modifier.STATIC)) {
        return (TypeElement) element;
    }
  }

  processing().getMessager()
      .printMessage(Diagnostic.Kind.ERROR,
          "Element annotated with @Metainf.Service annotation should be public top-level non-abstract or static class in a package",
          element);

  return null;
}
 

protected boolean isNonStaticInnerClass(TypeElement typeElement) {
  Element outerClassOrPackage = typeElement.getEnclosingElement();
  if (outerClassOrPackage.getKind() != ElementKind.PACKAGE
      && !typeElement.getModifiers().contains(Modifier.STATIC)) {
    error(
        typeElement,
        "Class %s is a non static inner class. @Inject constructors are not allowed in non static inner classes.",
        typeElement.getQualifiedName());
    return true;
  }
  return false;
}
 

private static Element handlePossibleAnonymousInnerClass(CompilationInfo info, final Element el) {
    Element encl = el.getEnclosingElement();
    Element doubleEncl = encl != null ? encl.getEnclosingElement() : null;
    
    if (   doubleEncl != null
        && !doubleEncl.getKind().isClass()
        && !doubleEncl.getKind().isInterface()
        && doubleEncl.getKind() != ElementKind.PACKAGE
        && encl.getKind() == ElementKind.CLASS) {
        TreePath enclTreePath = info.getTrees().getPath(encl);
        Tree enclTree = enclTreePath != null ? enclTreePath.getLeaf() : null;
        
        if (enclTree != null && TreeUtilities.CLASS_TREE_KINDS.contains(enclTree.getKind()) && enclTreePath.getParentPath().getLeaf().getKind() == Tree.Kind.NEW_CLASS) {
            NewClassTree nct = (NewClassTree) enclTreePath.getParentPath().getLeaf();
            
            if (nct.getClassBody() != null) {
                Element parentElement = info.getTrees().getElement(new TreePath(enclTreePath, nct.getIdentifier()));
                
                if (parentElement == null || parentElement.getKind().isInterface()) {
                    return parentElement;
                } else {
                    //annonymous innerclass extending a class. Find out which constructor is used:
                    TreePath superConstructorCall = new FindSuperConstructorCall().scan(enclTreePath, null);
                    
                    if (superConstructorCall != null) {
                        return info.getTrees().getElement(superConstructorCall);
                    }
                }
            }
        }
        
        return null;//prevent jumps to incorrect positions
    } else {
        if (encl != null) {
            return encl;
        } else {
            return el;
        }
    }
}
 

/**
 * Creates an {@link ElementHandle} representing a {@link PackageElement}.
 * @param packageName the name of the package
 * @return the created {@link ElementHandle}
 * @since 0.98
 */
@NonNull
public static ElementHandle<PackageElement> createPackageElementHandle (
    @NonNull final String packageName) {
    Parameters.notNull("packageName", packageName); //NOI18N
    return new ElementHandle<PackageElement>(ElementKind.PACKAGE, packageName);
}
 

private TypeElement outermostTypeElement(Element el) {
    while (el.getEnclosingElement().getKind() != ElementKind.PACKAGE) {
        el = el.getEnclosingElement();
    }

    return (TypeElement) el;
}
 

@Override
@Value.Derived
@Value.Auxiliary
public DeclaringPackage packageOf() {
  Element e = element();
  for (; e.getKind() != ElementKind.PACKAGE; e = e.getEnclosingElement()) {
  }
  return interner().forPackage(
      ImmutableProto.DeclaringPackage.builder()
          .environment(environment())
          .interner(interner())
          .element((PackageElement) e)
          .build());
}
 

private static boolean isLocalized(final URL docURL, final Element element) {
    if (docURL == null) {
        return false;
    }
    Element pkg = element;
    while (pkg.getKind() != ElementKind.PACKAGE) {
        pkg = pkg.getEnclosingElement();
        if (pkg == null) {
            return false;
        }
    }
    String pkgBinName = ((PackageElement)pkg).getQualifiedName().toString();
    String surl = docURL.toString();
    int index = surl.lastIndexOf('/');      //NOI18N
    if (index < 0) {
        return false;
    }
    index-=(pkgBinName.length()+1);
    if (index < 0) {
        return false;
    }
    index-=API.length();        
    if (index < 0 || !surl.regionMatches(index,API,0,API.length())) {
        return false;
    }
    int index2 = surl.lastIndexOf('/', index-1);  //NOI18N
    if (index2 < 0) {
        return false;
    }
    String lang = surl.substring(index2+1, index);        
    return LANGS.contains(lang);
}
 

private PackageElement getPackageOf(Element el) {
    while ((el != null) && (el.getKind() != ElementKind.PACKAGE)) el = el.getEnclosingElement();

    return (PackageElement) el;
}
 

@Override
public int compare(Object o1, Object o2) {
    if (o1 == o2)
        return 0;
    
    boolean isStatic1 = false;
    StringBuilder sb1 = new StringBuilder();
    if (o1 instanceof ImportTree) {
        isStatic1 = ((ImportTree)o1).isStatic();
        sb1.append(((ImportTree)o1).getQualifiedIdentifier().toString());
    } else if (o1 instanceof Element) {
        Element e1 = (Element)o1;
        if (e1.getKind().isField() || e1.getKind() == ElementKind.METHOD) {
            sb1.append('.').append(e1.getSimpleName());
            e1 = e1.getEnclosingElement();
            isStatic1 = true;
        }
        if (e1.getKind().isClass() || e1.getKind().isInterface()) {
            sb1.insert(0, ((TypeElement)e1).getQualifiedName());
        } else if (e1.getKind() == ElementKind.PACKAGE) {
            sb1.insert(0, ((PackageElement)e1).getQualifiedName());
        }
    }
    String s1 = sb1.toString();
        
    boolean isStatic2 = false;
    StringBuilder sb2 = new StringBuilder();
    if (o2 instanceof ImportTree) {
        isStatic2 = ((ImportTree)o2).isStatic();
        sb2.append(((ImportTree)o2).getQualifiedIdentifier().toString());
    } else if (o2 instanceof Element) {
        Element e2 = (Element)o2;
        if (e2.getKind().isField() || e2.getKind() == ElementKind.METHOD) {
            sb2.append('.').append(e2.getSimpleName());
            e2 = e2.getEnclosingElement();
            isStatic2 = true;
        }
        if (e2.getKind().isClass() || e2.getKind().isInterface()) {
            sb2.insert(0, ((TypeElement)e2).getQualifiedName());
        } else if (e2.getKind() == ElementKind.PACKAGE) {
            sb2.insert(0, ((PackageElement)e2).getQualifiedName());
        }
    }
    String s2 = sb2.toString();

    int bal = groups.getGroupId(s1, isStatic1) - groups.getGroupId(s2, isStatic2);

    return bal == 0 ? s1.compareTo(s2) : bal;
}
 

private static PackageElement getPackage(Element type) {
  while (type.getKind() != ElementKind.PACKAGE) {
    type = type.getEnclosingElement();
  }
  return (PackageElement) type;
}
 

@Override
public <T> void search (
        @NonNull final ElementHandle<?> element,
        @NonNull final Set<? extends UsageType> usageType,
        @NonNull final Set<? extends ClassIndex.SearchScopeType> scope,
        @NonNull final Convertor<? super Document, T> convertor,
        @NonNull final Set<? super T> result) throws InterruptedException, IOException {
    Parameters.notNull("element", element); //NOI18N
    Parameters.notNull("usageType", usageType); //NOI18N
    Parameters.notNull("scope", scope); //NOI18N
    Parameters.notNull("convertor", convertor); //NOI18N
    Parameters.notNull("result", result);   //NOI18N
    final Pair<Convertor<? super Document, T>,Index> ctu = indexPath.getPatch(convertor);
    try {
        final String binaryName = SourceUtils.getJVMSignature(element)[0];
        final ElementKind kind = element.getKind();
        if (kind == ElementKind.PACKAGE) {
            IndexManager.priorityAccess(() -> {
                final Query q = QueryUtil.scopeFilter(
                        QueryUtil.createPackageUsagesQuery(binaryName,usageType,Occur.SHOULD),
                        scope);
                if (q != null) {
                    index.query(result, ctu.first(), DocumentUtil.declaredTypesFieldSelector(false, false), cancel.get(), q);
                    if (ctu.second() != null) {
                        ctu.second().query(result, convertor, DocumentUtil.declaredTypesFieldSelector(false, false), cancel.get(), q);
                    }
                }
                return null;
            });
        } else if (kind.isClass() ||
                   kind.isInterface() ||
                   kind == ElementKind.OTHER) {
            if (BinaryAnalyser.OBJECT.equals(binaryName)) {
                getDeclaredElements(
                    "", //NOI18N
                    ClassIndex.NameKind.PREFIX,
                    scope,
                    DocumentUtil.declaredTypesFieldSelector(false, false),
                    convertor,
                    result);
            } else {
                IndexManager.priorityAccess(() -> {
                    final Query usagesQuery = QueryUtil.scopeFilter(
                            QueryUtil.createUsagesQuery(binaryName, usageType, Occur.SHOULD),
                            scope);
                    if (usagesQuery != null) {
                        index.query(result, ctu.first(), DocumentUtil.declaredTypesFieldSelector(false, false), cancel.get(), usagesQuery);
                        if (ctu.second() != null) {
                            ctu.second().query(result, convertor, DocumentUtil.declaredTypesFieldSelector(false, false), cancel.get(), usagesQuery);
                        }
                    }
                    return null;
                });
            }
        } else {
            throw new IllegalArgumentException(element.toString());
        }
    } catch (IOException ioe) {
        this.<Void,IOException>handleException(null, ioe, root);
    }
}
 

@TriggerTreeKind({Tree.Kind.CLASS, Tree.Kind.INTERFACE})
public static ErrorDescription check(HintContext context) {
    TreePath tp = context.getPath();
    ClassTree cls = (ClassTree) tp.getLeaf();
    CompilationInfo info = context.getInfo();
    SourcePositions sourcePositions = info.getTrees().getSourcePositions();
    long startPos = sourcePositions.getStartPosition(tp.getCompilationUnit(), cls);
    if (startPos > Integer.MAX_VALUE) {
        return null;
    }
    int[] bodySpan = info.getTreeUtilities().findBodySpan(cls);
    if (bodySpan == null || bodySpan[0] <= startPos) {
        return null;
    }
    int caret = context.getCaretLocation();
    if (startPos < 0 || caret < 0 || caret < startPos || caret >= bodySpan[0]) {
        return null;
    }

    // #222487
    // If there is a compile-time error on the class, then don't offer to
    // create a subclass.
    List<Diagnostic> errors = info.getDiagnostics();
    if (!errors.isEmpty()) {
        for (Diagnostic d : errors) {
            if (d.getKind() != Diagnostic.Kind.ERROR) {
                continue;
            }
            // Check that the error's start position is within the class header
            // Note: d.getEndPosition() is not used because, for example,
            // a "compiler.err.does.not.override.abstract" error ends at
            // the end of the class tree.
            if (startPos <= d.getStartPosition() && d.getStartPosition() <= bodySpan[0]) {
                return null;
            }
        }
    }

    TypeElement typeElement = (TypeElement) info.getTrees().getElement(tp);
    
    if (typeElement == null || typeElement.getModifiers().contains(Modifier.FINAL)) return null;

    Element outer = typeElement.getEnclosingElement();
    // do not offer the hint for non-static inner classes. Permit for classes nested into itnerface - no enclosing instance
    if (outer != null && outer.getKind() != ElementKind.PACKAGE && outer.getKind() != ElementKind.INTERFACE) {
        if (outer.getKind() != ElementKind.CLASS && outer.getKind() != ElementKind.ENUM) {
            return null;
        }
        if (!typeElement.getModifiers().contains(Modifier.STATIC)) {
            return null;
        }
    }

    
    ClassPath cp = info.getClasspathInfo().getClassPath(PathKind.SOURCE);
    FileObject root = cp.findOwnerRoot(info.getFileObject());
    if (root == null) { //File not part of any project
        return null;
    }

    PackageElement packageElement = (PackageElement) info.getElementUtilities().outermostTypeElement(typeElement).getEnclosingElement();
    CreateSubclassFix fix = new CreateSubclassFix(info, root, packageElement.getQualifiedName().toString(), typeElement.getSimpleName().toString() + "Impl", typeElement); //NOI18N
    return ErrorDescriptionFactory.forTree(context, context.getPath(), NbBundle.getMessage(CreateSubclass.class, typeElement.getKind() == ElementKind.CLASS
            ? typeElement.getModifiers().contains(Modifier.ABSTRACT) ? "ERR_ImplementAbstractClass" : "ERR_CreateSubclass" : "ERR_ImplementInterface"), fix); //NOI18N
}
 

private PackageElement getPackage(Element element) {
    while (element.getKind() != ElementKind.PACKAGE) {
        element = element.getEnclosingElement();
    }
    return (PackageElement) element;
}
 

public PackageElement getPackage(Element type) {
  while (type.getKind() != ElementKind.PACKAGE) {
    type = type.getEnclosingElement();
  }
  return (PackageElement) type;
}
 

@Override
public RefactoringUI create(CompilationInfo info, TreePathHandle[] handles, FileObject[] files, NonRecursiveFolder[] packages) {
    final boolean b = lookup.lookup(ExplorerContext.class)!=null;
    if (packages != null && packages.length == 1) {
        return new SafeDeleteUI(packages[0], b);
    }
    if (handles != null && handles.length == 0 || (files!=null && files.length > 1)) {
        return new SafeDeleteUI(files, Arrays.asList(handles), b);
    }
    
    if (b && files!=null && files.length == 1) {
        return new SafeDeleteUI(files, Arrays.asList(handles), b);
    }
    
    if (info == null) {
        return new SafeDeleteUI(handles);
    }
    
    TreePathHandle selectedElement = handles[0];
    Element selected = selectedElement.resolveElement(info);
    TreePath selectedTree = selectedElement.resolve(info);
    if (selected == null || selectedTree == null) {
        return null;
    }
    if (selected.getKind() == ElementKind.PACKAGE || selected.getEnclosingElement().getKind() == ElementKind.PACKAGE) {
        ElementHandle<Element> handle = ElementHandle.create(selected);
        FileObject file = SourceUtils.getFile(handle, info.getClasspathInfo());
        if (file == null) {
            return null;
        }
        if (file.getName().equals(selected.getSimpleName().toString())) {
            return new SafeDeleteUI(new FileObject[]{file}, Collections.singleton(selectedElement), b);
        }
    }
    if(!TreeUtilities.CLASS_TREE_KINDS.contains(selectedTree.getParentPath().getLeaf().getKind())
            && selectedTree.getParentPath().getLeaf().getKind() != Tree.Kind.COMPILATION_UNIT
            && selectedTree.getLeaf().getKind() == Tree.Kind.VARIABLE) {
        switch (selectedTree.getParentPath().getLeaf().getKind()) {
            case BLOCK:
            case METHOD:
                break;
            default:
                return null;
        }
    }
    return new SafeDeleteUI(new TreePathHandle[]{selectedElement});
}
 

private static PackageElement findPkg(Element e) {
    while (e.getKind() != ElementKind.PACKAGE) {
        e = e.getEnclosingElement();
    }
    return (PackageElement)e;
}