javax.lang.model.element.QualifiedNameable#com.sun.source.util.TreePath源码实例Demo

private static boolean isAssigned(
        final Element what,
        final Iterable<? extends TreePath> where,
        final Trees trees) {
    ErrorAwareTreePathScanner<Boolean, Void> scanner = new ErrorAwareTreePathScanner<Boolean, Void>() {
        @Override public Boolean visitAssignment(AssignmentTree node, Void p) {
            if (trees.getElement(new TreePath(getCurrentPath(), node.getVariable())) == what) {
                return true;
            }
            return super.visitAssignment(node, p);
        }
        @Override
        public Boolean reduce(Boolean r1, Boolean r2) {
            return r1 == Boolean.TRUE || r2 == Boolean.TRUE;
        }
    };
    
    for (TreePath usage : where) {
        if (scanner.scan(usage, null) == Boolean.TRUE) {
            return true;
        }
    }
    return false;
}
 

private Symbol attributeParamIdentifier(TreePath path, DCParam ptag) {
    Symbol javadocSymbol = getElement(path);
    if (javadocSymbol == null)
        return null;
    ElementKind kind = javadocSymbol.getKind();
    List<? extends Symbol> params = List.nil();
    if (kind == ElementKind.METHOD || kind == ElementKind.CONSTRUCTOR) {
        MethodSymbol ee = (MethodSymbol) javadocSymbol;
        params = ptag.isTypeParameter()
                ? ee.getTypeParameters()
                : ee.getParameters();
    } else if (kind.isClass() || kind.isInterface()) {
        ClassSymbol te = (ClassSymbol) javadocSymbol;
        params = te.getTypeParameters();
    }

    for (Symbol param : params) {
        if (param.getSimpleName() == ptag.getName().getName()) {
            return param;
        }
    }
    return null;
}
 

private static List<? extends TypeMirror> computeParenthesis(Set<ElementKind> types, CompilationInfo info, TreePath parent, Tree error, int offset) {
    ParenthesizedTree pt = (ParenthesizedTree) parent.getLeaf();
    
    if (pt.getExpression() != error) {
        return null;
    }
    
    TreePath parentParent = parent.getParentPath();
    List<? extends TypeMirror> upperTypes = resolveType(types, info, parentParent, pt, offset, null, null);
    
    if (upperTypes == null) {
        return null;
    }
    
    return upperTypes;
}
 

static boolean isValid(CompilationInfo javac, TreePath path, Severity severity, Access access, int caret) {
    Tree leaf = path.getLeaf();
    boolean onLine = severity == Severity.HINT && caret > -1;
    switch (leaf.getKind()) {
        case ANNOTATION_TYPE:
        case CLASS:
        case ENUM:
        case INTERFACE:
            return access.isAccessible(javac, path, false) && (!onLine || isInHeader(javac, (ClassTree) leaf, caret));
        case METHOD:
            return access.isAccessible(javac, path, false) && (!onLine || isInHeader(javac, (MethodTree) leaf, caret));
        case VARIABLE:
            return access.isAccessible(javac, path, false);
    }
    return false;
}
 

public List<? extends CodeGenerator> create(Lookup context) {
    ArrayList<CodeGenerator> ret = new ArrayList<CodeGenerator>();
    JTextComponent component = context.lookup(JTextComponent.class);
    CompilationController controller = context.lookup(CompilationController.class);
    TreePath path = context.lookup(TreePath.class);
    path = path != null ? getPathElementOfKind(Tree.Kind.CLASS, path) : null;
    if (component == null || controller == null || path == null)
        return ret;
    try {
        controller.toPhase(JavaSource.Phase.ELEMENTS_RESOLVED);
        Element elem = controller.getTrees().getElement(path);
        if (elem != null) {
            SendEmailCodeGenerator gen = createSendEmailGenerator(component, controller, elem);
            if (gen != null)
                ret.add(gen);
        }
    } catch (IOException ioe) {
        ioe.printStackTrace();
    }
    return ret;
}
 

private void resumeAfter(Tree target, Map< Element, State> state) {
    for (TreePath tp : pendingFinally) {
        boolean shouldBeRun = false;

        for (Tree t : tp) {
            if (t == target) {
                shouldBeRun = true;
                break;
            }
        }

        if (shouldBeRun) {
            recordResume(resumeBefore, tp.getLeaf(), state);
        } else {
            break;
        }
    }

    recordResume(resumeAfter, target, state);
}
 

public Boolean visitBlock(BlockTree node, ConstructorData p) {
    List<? extends StatementTree> statements = new ArrayList<StatementTree>(node.getStatements());
    
    for (int i = 0; i < statements.size(); i++) {
        StatementTree st = statements.get(i);
        
        if (st.getKind() == Kind.IF) {
            IfTree it = (IfTree) st; 
            if (it.getElseStatement() == null && Utilities.exitsFromAllBranchers(info, new TreePath(new TreePath(getCurrentPath(), it), it.getThenStatement()))) {
                generalizedIf(it.getCondition(), it.getThenStatement(), statements.subList(i + 1, statements.size()), false);
                break;
            }
        }
        
        scan(st, null);
    }
    
    return null;
}
 

private boolean isLastInControlFlow(TreePath pathToInstruction) {
    Tree currentTree = pathToInstruction.getLeaf();
    Tree parentTree = pathToInstruction.getParentPath().getLeaf();
    if (parentTree.equals(this.loop)) {
        return true;
    } else if (parentTree.getKind() == Tree.Kind.BLOCK) {
        List<? extends StatementTree> ls = ((BlockTree) parentTree).getStatements();
        if (ls.get(ls.size() - 1).equals(currentTree)) {
            return isLastInControlFlow(pathToInstruction.getParentPath());
        } else {
            return false;
        }

    } else if (parentTree.getKind() == Tree.Kind.AND.IF && ((IfTree) parentTree).getElseStatement() != null) {
        return false;
    } else {
        return this.isLastInControlFlow(pathToInstruction.getParentPath());
    }


}
 

@Override
public void run(WorkingCopy parameter) throws Exception {
    parameter.toPhase(JavaSource.Phase.ELEMENTS_RESOLVED);
    TypeElement resolved = handle.resolve(parameter);
    if (!Utilities.isValidElement(resolved)) {
        return;
    }
    TreePath path = parameter.getTrees().getPath(resolved);
    if (path == null) {
        return;
    }
    
    ProcessorHintSupport supp = new ProcessorHintSupport(parameter, path);
    if (!supp.initialize() || !supp.canOverrideProcessor(true)) {
        return;
    }
    supp.makeGetSupportedOverride(parameter, null, true);
}
 

private static boolean isSynced(HintContext ctx, TreePath inspect) {
    while (inspect != null && !TreeUtilities.CLASS_TREE_KINDS.contains(inspect.getLeaf().getKind())) {
        if (inspect.getLeaf().getKind() == Kind.SYNCHRONIZED) {
            return true;
        }

        if (inspect.getLeaf().getKind() == Kind.METHOD) {
            if (((MethodTree) inspect.getLeaf()).getModifiers().getFlags().contains(Modifier.SYNCHRONIZED)) {
                return true;
            }

            break;
        }

        inspect = inspect.getParentPath();
    }

    return false;
}
 

private static CatchTree createCatch(WorkingCopy info, TreeMaker make, TreePath statement, String name, TypeMirror type) {
    StatementTree logStatement = createExceptionsStatement(info, make, name);

    if (logStatement == null) {
        logStatement = createLogStatement(info, make, statement, name);
    }
    
    if (logStatement == null) {
        logStatement = createRethrowAsRuntimeExceptionStatement(info, make, name);
    }
    
    if (logStatement == null) {
        logStatement = createRethrow(info, make, name);
    }

    if (logStatement == null) {
        logStatement = createPrintStackTraceStatement(info, make, name);
    }

    return make.Catch(make.Variable(make.Modifiers(EnumSet.noneOf(Modifier.class)), name, make.Type(type), null), make.Block(Collections.singletonList(logStatement), false));
}
 

public FixImport(FileObject file, String fqn, ElementHandle<Element> toImport, String sortText, boolean isValid, CompilationInfo info, @NullAllowed TreePath replacePath, @NullAllowed String replaceSuffix, 
        boolean doOrganize) {
    super(file, fqn, toImport, sortText, isValid);
    if (replacePath != null) {
        this.replacePathHandle = TreePathHandle.create(replacePath, info);
        this.suffix = replaceSuffix;
        while (replacePath != null && replacePath.getLeaf().getKind() != Kind.IMPORT) {
            replacePath = replacePath.getParentPath();
        }
        this.statik = replacePath != null ? ((ImportTree) replacePath.getLeaf()).isStatic() : false;
    } else {
        this.replacePathHandle = null;
        this.suffix = null;
        this.statik = false;
    }
    this.doOrganize = doOrganize;
}
 

@Override
    void check(TreePath path, Name name) throws Exception {
        String raw = trees.getDocComment(path);
        String normRaw = normalize(raw);

        StringWriter out = new StringWriter();
        DocPretty dp = new DocPretty(out);
        dp.print(trees.getDocCommentTree(path));
        String pretty = out.toString();

        if (!pretty.equals(normRaw)) {
            error("mismatch");
            System.err.println("*** expected:");
            System.err.println(normRaw.replace(" ", "_"));
            System.err.println("*** found:");
            System.err.println(pretty.replace(" ", "_"));
//            throw new Error();
        }
    }
 

/**
 * Returns tree which was reparsed by an incremental reparse.
 * When the source file wasn't parsed yet or the parse was a full parse
 * this method returns null.
 * <p class="nonnormative">
 * Currently the leaf tree is a MethodTree but this may change in the future.
 * Client of this method is responsible to check the corresponding TreeKind
 * to find out if it may perform on the changed subtree or it needs to
 * reprocess the whole tree.
 * </p>
 * @return {@link TreePath} or null
 * @since 0.31
 */
public @CheckForNull @CheckReturnValue TreePath getChangedTree () {
    checkConfinement();
    if (JavaSource.Phase.PARSED.compareTo (impl.getPhase())>0) {
        return null;
    }
    final Pair<DocPositionRegion,MethodTree> changedTree = impl.getChangedTree();
    if (changedTree == null) {
        return null;
    }
    final CompilationUnitTree cu = impl.getCompilationUnit();
    if (cu == null) {
        return null;
    }
    return TreePath.getPath(cu, changedTree.second());
}
 

private void addPackageContent(PackageElement pe, EnumSet<ElementKind> kinds, DeclaredType baseType, Set<? extends Element> toExclude, String prefix, int substitutionOffset, JavadocContext jdctx) {
    CompilationInfo controller = jdctx.javac;
    Element srcEl = jdctx.handle.resolve(controller);
    Elements elements = controller.getElements();
    Types types = controller.getTypes();
    Trees trees = controller.getTrees();
    TreeUtilities tu = controller.getTreeUtilities();
    ElementUtilities eu = controller.getElementUtilities();
    TreePath docpath = srcEl != null ? trees.getPath(srcEl) : null;
    Scope scope = docpath != null ? trees.getScope(docpath) : tu.scopeFor(caretOffset);
    for(Element e : pe.getEnclosedElements()) {
        if ((e.getKind().isClass() || e.getKind().isInterface()) && (toExclude == null || !toExclude.contains(e))) {
            String name = e.getSimpleName().toString();
                if (Utilities.startsWith(name, prefix) && (Utilities.isShowDeprecatedMembers() || !elements.isDeprecated(e))
                    && trees.isAccessible(scope, (TypeElement)e)
                    && isOfKindAndType(e.asType(), e, kinds, baseType, scope, trees, types)
                    && !Utilities.isExcluded(eu.getElementName(e, true))) {
                    items.add(JavadocCompletionItem.createTypeItem(jdctx.javac, (TypeElement) e, substitutionOffset, null, elements.isDeprecated(e)/*, isOfSmartType(env, e.asType(), smartTypes)*/));
            }
        }
    }
}
 

private static List<? extends TypeMirror> computeClass(Set<ElementKind> types, CompilationInfo info, TreePath parent, Tree error, int offset) {
    ClassTree ct = (ClassTree) parent.getLeaf();
    
    if (ct.getExtendsClause() == error) {
        types.add(ElementKind.CLASS);
        return null;
    }
    
    for (Tree t : ct.getImplementsClause()) {
        if (t == error) {
            types.add(ElementKind.INTERFACE);
            return null;
        }
    }
    
    //XXX: annotation types...
    
    return null;
}
 

public List<Fix> run(CompilationInfo info, String diagnosticKey, int offset, TreePath treePath, Data<Void> data) {
    List<Fix> result = new ArrayList<Fix>();
    List<TypeMirror> targetType = new ArrayList<TypeMirror>();
    TreePath[] tmTree = new TreePath[1];
    ExpressionTree[] expression = new ExpressionTree[1];
    Tree[] leaf = new Tree[1];
    
    computeType(info, offset, targetType, tmTree, expression, leaf);
    
    if (!targetType.isEmpty()) {
        TreePath expressionPath = TreePath.getPath(info.getCompilationUnit(), expression[0]); //XXX: performance
        for (TypeMirror type : targetType) {
            if (type.getKind() != TypeKind.NULL) {
                result.add(new AddCastFix(info, expressionPath, tmTree[0], type).toEditorFix());
            }
        }
    }
    
    return result;
}
 

/** Set the current declaration and its doc comment. */
void setCurrent(TreePath path, DocCommentTree comment) {
    currPath = path;
    currDocComment = comment;
    currElement = trees.getElement(currPath);
    currOverriddenMethods = ((JavacTypes) types).getOverriddenMethods(currElement);

    AccessKind ak = AccessKind.PUBLIC;
    for (TreePath p = path; p != null; p = p.getParentPath()) {
        Element e = trees.getElement(p);
        if (e != null && e.getKind() != ElementKind.PACKAGE && e.getKind() != ElementKind.MODULE) {
            ak = min(ak, AccessKind.of(e.getModifiers()));
        }
    }
    currAccess = ak;
}
 

private static String getCommentText(TreePath p) {
    if (p == null)
        return null;

    JCCompilationUnit topLevel = (JCCompilationUnit) p.getCompilationUnit();
    JCTree tree = (JCTree) p.getLeaf();
    return topLevel.docComments.getCommentText(tree);
}
 

@Override
public Void visitContinue(ContinueTree node, Collection<TreePath> trees) {
    if (!analyzeThrows && !seenTrees.contains(info.getTreeUtilities().getBreakContinueTarget(getCurrentPath()))) {
        trees.add(getCurrentPath());
    }
    return null;
}
 

public static TypeElement getTopLevelClassElement(CompilationController controller) {
    ClassTree classTree = getTopLevelClassTree(controller);
    if (classTree == null) {
        return null;
    }
    Trees trees = controller.getTrees();
    TreePath path = trees.getPath(controller.getCompilationUnit(), classTree);

    return (TypeElement) trees.getElement(path);
}
 

@Override
public Void scan(Tree tree, Void p) {
    if (tree == null) {
        return null;
    } else {
        //XXX:
        boolean oldMapComments = mapComments;
        try {
            limit = -1;
            mapComments |= tree == commentMapTarget;
            if ((commentMapTarget != null) && info.getTreeUtilities().isSynthetic(new TreePath(new TreePath(unit), tree)))
                return null;
            limit = setupLimit(tree);
            if (commentMapTarget != null) {
                mapComments2(tree, true, false);
            }
            Tree oldParent = parent;
            try {
                parent = tree;
                super.scan(tree, p);
            } finally {
                parent = oldParent;
            }
            if (commentMapTarget != null) {
                mapComments2(tree, false, tree.getKind() != Tree.Kind.BLOCK || parent == null || parent.getKind() != Tree.Kind.METHOD);
                if (mapComments) {
                    ((CommentSetImpl) createCommentSet(tree)).commentsMapped();
                }
            }
            return null;
        } finally {
            mapComments = oldMapComments;
        }
    }
}
 

/**
 */
public void run(CompilationController controller) throws IOException {
    controller.toPhase(Phase.RESOLVED);     //cursor position needed
    if (cancelled) {
        return;
    }

    TreePath treePath = controller.getTreeUtilities()
                                  .pathFor(caretPosition);
    if (treePath != null) {
        if (cancelled) {
            return;
        }
        
        TreePath parent = treePath.getParentPath();
        while (parent != null) {
            Tree.Kind parentKind = parent.getLeaf().getKind();
            if ((TreeUtilities.CLASS_TREE_KINDS.contains(parentKind))
                    || (parentKind == Tree.Kind.COMPILATION_UNIT)) {
                break;
            }
            treePath = parent;
            parent = treePath.getParentPath();
        }

    }

    if (treePath != null) {
        if (cancelled) {
            return;
        }

        try {
            element = controller.getTrees().getElement(treePath);
        } catch (IllegalArgumentException ex) {
            Logger.getLogger("global").log(Level.WARNING, null, ex);
        }
    }
}
 

private static VariableElement attributeThis(CompilationInfo info, TreePath tp) {
    //XXX:
    VariableElement thisVE = Hacks.attributeThis(info, tp);
    
    if (thisVE == null) {
        Logger.getLogger(Tiny.class.getName()).log(Level.WARNING, "m.localEnv == null");
        return null;
    }

    return thisVE;
}
 

@TriggerPatterns({
    @TriggerPattern(value = "java.lang.StringBuffer $x = $expr;"),
    @TriggerPattern(value = "java.lang.StringBuilder $x = $expr;"),
})
public static ErrorDescription checkReplace(HintContext ctx) {
    CompilationInfo ci = ctx.getInfo();
    TreePath vp = ctx.getVariables().get("$x"); // NOI18N
    TreePath initP = ctx.getVariables().get("$expr"); // NOI18N
    Element el = ci.getTrees().getElement(vp);
    if (el == null || el.getKind() != ElementKind.LOCAL_VARIABLE) {
        return null;
    }
    
    StringBufferUsageScanner scanner = new StringBufferUsageScanner(ci, ((VariableElement)el));
    TreePath declRoot = ctx.getPath().getParentPath();
    scanner.scan(declRoot, null);
    if (scanner.isIncompatible()) {
        return null;
    }
    NewAppendScanner newScan = new NewAppendScanner(ci);
    if (newScan.scan(initP, null) != Boolean.TRUE || !newScan.hasContents) {
        return null;
    }
    
    return ErrorDescriptionFactory.forTree(ctx, ctx.getPath(), Bundle.TEXT_ReplaceStringBufferByString(), 
            new RewriteToStringFix(
                TreePathHandle.create(vp, ci),
                TreePathHandle.create(declRoot, ci)
            ).toEditorFix());
}
 

/**
 * Returns list of problems. For the change method signature, there are two
 * possible warnings - if the method is overriden or if it overrides
 * another method.
 * @return  overrides or overriden problem or both
 */
@Override
protected Problem preCheck(CompilationController info) throws IOException {
    fireProgressListenerStart(refactoring.PRE_CHECK, 4);
    Problem preCheckProblem = null;
    info.toPhase(JavaSource.Phase.RESOLVED);

    TreePath tp = treePathHandle.resolve(info);
    TreePath method = JavaPluginUtils.findMethod(tp);
    if (method == null) {
        preCheckProblem = createProblem(preCheckProblem, true, NbBundle.getMessage(IntroduceParameterPlugin.class, "ERR_ChangeParamsWrongType")); //NOI18N
        return preCheckProblem;
    }

    Element el = info.getTrees().getElement(method);
    if (!RefactoringUtils.isExecutableElement(el)) {
        preCheckProblem = createProblem(preCheckProblem, true, NbBundle.getMessage(IntroduceParameterPlugin.class, "ERR_ChangeParamsWrongType")); //NOI18N
        return preCheckProblem;
    }

    preCheckProblem = JavaPluginUtils.isSourceElement(el, info);
    if (preCheckProblem != null) {
        return preCheckProblem;
    }

    if (info.getElementUtilities().enclosingTypeElement(el).getKind() == ElementKind.ANNOTATION_TYPE) {
        preCheckProblem = new Problem(true, NbBundle.getMessage(IntroduceParameterPlugin.class, "ERR_MethodsInAnnotationsNotSupported")); //NOI18N
        return preCheckProblem;
    }

    for (ExecutableElement e : JavaRefactoringUtils.getOverriddenMethods((ExecutableElement) el, info)) {
        ElementHandle<ExecutableElement> handle = ElementHandle.create(e);
        if (RefactoringUtils.isFromLibrary(handle, info.getClasspathInfo())) {
            preCheckProblem = createProblem(preCheckProblem, true, NbBundle.getMessage(IntroduceParameterPlugin.class, "ERR_CannnotRefactorLibrary", el)); //NOI18N
        }
    }

    fireProgressListenerStop();
    return preCheckProblem;
}
 

public ChangeInfo implement() throws Exception {
    js.runModificationTask(new Task<WorkingCopy>() {
        public void run(WorkingCopy wc) throws Exception {
            wc.toPhase(Phase.RESOLVED);
            
            TreePath ifTP = ifHandle.resolve(wc);
            TreePath resolvedExpression = expression.resolve(wc);
            TypeMirror resolvedType = type.resolve(wc);
            
            if (ifTP == null || resolvedType == null || resolvedExpression == null) {
                return ;
            }
            
            IfTree ift = (IfTree) ifTP.getLeaf();
            StatementTree then = ift.getThenStatement();
            
            if (then.getKind() == Kind.ERRONEOUS) {
                return ; //TODO.
            }
            
            List<StatementTree> statements = new LinkedList<StatementTree>();
            
            if (then.getKind() == Kind.BLOCK) {
                statements.addAll(((BlockTree) then).getStatements());
            } else {
                statements.add(then);
            }
            
            TreeMaker make = wc.getTreeMaker();
            VariableTree decl = make.Variable(make.Modifiers(EnumSet.noneOf(Modifier.class)), name, make.Type(resolvedType), make.TypeCast(make.Type(resolvedType), (ExpressionTree) resolvedExpression.getLeaf()));
            
            statements.add(0, decl);
            
            BlockTree nue = make.Block(statements, false);
            
            wc.rewrite(then, nue);
        }
    }).commit();
    return null;
}
 

boolean traceThrowable(TreePath path) {
    Boolean b = processEnclosingStatement(path);
    if (b != null) {
        return b;
    }
    // recursively process pass through variables.
    while ((b = processVariables()) == null) {
        // OK
    }
        
    return b;
}
 

/**
 * @param tp tested {@link TreePath}
 * @return true if <code>tp</code> is an IDENTIFIER in a VARIABLE in an ENHANCED_FOR_LOOP
 */
public static boolean isEnhancedForLoopIdentifier(TreePath tp) {
    if (tp == null || tp.getLeaf().getKind() != Kind.IDENTIFIER)
        return false;
    TreePath parent = tp.getParentPath();
    if (parent == null || parent.getLeaf().getKind() != Kind.VARIABLE)
        return false;
    TreePath context = parent.getParentPath();
    if (context == null || context.getLeaf().getKind() != Kind.ENHANCED_FOR_LOOP)
        return false;
    return true;
}
 

private Boolean scan(Tree node, Tree p, TreePath pOrigin) {
    if (node == null && p == null)
        return true;

    if (node != null && p == null)
        return false;
    
    return scan(node, new TreePath(pOrigin, p));
}