Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 package com.sun.tools.doclint;

 import java.util.Set;

 import javax.lang.model.element.Element;

 import javax.lang.model.element.ExecutableElement;

 import javax.lang.model.element.Modifier;

 import javax.lang.model.type.TypeMirror;

 import javax.lang.model.util.Elements;

 import javax.lang.model.util.Types;

 import com.sun.source.doctree.DocCommentTree;

 import com.sun.source.util.DocTrees;

 import com.sun.source.util.JavacTask;

 import com.sun.source.util.SourcePositions;

 import com.sun.source.util.TreePath;

 import com.sun.tools.javac.model.JavacTypes;

 import com.sun.tools.javac.tree.JCTree;

 /**

  * Utility container for current execution environment,

  * providing the current declaration and its doc comment.

  *

  * <p><b>This is NOT part of any supported API.

  * If you write code that depends on this, you do so at your own

  * risk.  This code and its internal interfaces are subject to change

  * or deletion without notice.</b></p>

  */

 public class Env {

     /**

      * Access kinds for declarations.

      */

     public enum AccessKind {

         PRIVATE,

         PACKAGE,

         PROTECTED,

         PUBLIC;

         static boolean accepts(String opt) {

             for (AccessKind g: values())

                 if (opt.equals(g.name().toLowerCase())) return true;

             return false;

         }

         static AccessKind of(Set<Modifier> mods) {

             if (mods.contains(Modifier.PUBLIC))

                 return AccessKind.PUBLIC;

             else if (mods.contains(Modifier.PROTECTED))

                 return AccessKind.PROTECTED;

             else if (mods.contains(Modifier.PRIVATE))

                 return AccessKind.PRIVATE;

             else

                 return AccessKind.PACKAGE;

         }

     };

     /** Message handler. */

     final Messages messages;

     // Utility classes

     DocTrees trees;

     Elements elements;

     Types types;

     // Types used when analysing doc comments.

     TypeMirror java_lang_Error;

     TypeMirror java_lang_RuntimeException;

     TypeMirror java_lang_Throwable;

     TypeMirror java_lang_Void;

     /** The path for the declaration containing the comment currently being analyzed. */

     TreePath currPath;

     /** The element for the declaration containing the comment currently being analyzed. */

     Element currElement;

     /** The comment current being analyzed. */

     DocCommentTree currDocComment;

     /**

      * The access kind of the declaration containing the comment currently being analyzed.

      * This is the minimum (most restrictive) access kind of the declaration iteself

      * and that of its containers. For example, a public method in a private class is

      * noted as private.

      */

     AccessKind currAccess;

     /** The set of methods, if any, that the current declaration overrides. */

     Set<? extends ExecutableElement> currOverriddenMethods;

     Env() {

         messages = new Messages(this);

     }

     void init(JavacTask task) {

         init(DocTrees.instance(task), task.getElements(), task.getTypes());

     }

     void init(DocTrees trees, Elements elements, Types types) {

         this.trees = trees;

         this.elements = elements;

         this.types = types;

         java_lang_Error = elements.getTypeElement("java.lang.Error").asType();

         java_lang_RuntimeException = elements.getTypeElement("java.lang.RuntimeException").asType();

         java_lang_Throwable = elements.getTypeElement("java.lang.Throwable").asType();

         java_lang_Void = elements.getTypeElement("java.lang.Void").asType();

     }

     /** 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 = null;

         for (TreePath p = path; p != null; p = p.getParentPath()) {

             Element e = trees.getElement(p);

             if (e != null) {

                 ak = min(ak, AccessKind.of(e.getModifiers()));

             }

         }

         currAccess = ak;

     }

     AccessKind getAccessKind() {

         return currAccess;

     }

     long getPos(TreePath p) {

         return ((JCTree) p.getLeaf()).pos;

     }

     long getStartPos(TreePath p) {

         SourcePositions sp = trees.getSourcePositions();

         return sp.getStartPosition(p.getCompilationUnit(), p.getLeaf());

     }

     private <T extends Comparable<T>> T min(T item1, T item2) {

         return (item1 == null) ? item2

                 : (item2 == null) ? item1

                 : item1.compareTo(item2) <= 0 ? item1 : item2;

     }

 }