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

 /*

  * Copyright (c) 2005, 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

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 package com.sun.source.util;

 import java.lang.reflect.Method;

 import javax.annotation.processing.ProcessingEnvironment;

 import javax.lang.model.element.AnnotationMirror;

 import javax.lang.model.element.AnnotationValue;

 import javax.lang.model.element.Element;

 import javax.lang.model.element.ExecutableElement;

 import javax.lang.model.element.TypeElement;

 import javax.lang.model.type.DeclaredType;

 import javax.lang.model.type.ErrorType;

 import javax.lang.model.type.TypeMirror;

 import javax.tools.Diagnostic;

 import javax.tools.JavaCompiler.CompilationTask;

 import com.sun.source.tree.CatchTree;

 import com.sun.source.tree.ClassTree;

 import com.sun.source.tree.CompilationUnitTree;

 import com.sun.source.tree.MethodTree;

 import com.sun.source.tree.Scope;

 import com.sun.source.tree.Tree;

 /**

  * Bridges JSR 199, JSR 269, and the Tree API.

  *

  * @author Peter von der Ahé

  */

 public abstract class Trees {

     /**

      * Gets a Trees object for a given CompilationTask.

      * @param task the compilation task for which to get the Trees object

      * @throws IllegalArgumentException if the task does not support the Trees API.

      */

     public static Trees instance(CompilationTask task) {

         String taskClassName = task.getClass().getName();

         if (!taskClassName.equals("com.sun.tools.javac.api.JavacTaskImpl")

                 && !taskClassName.equals("com.sun.tools.javac.api.BasicJavacTask"))

             throw new IllegalArgumentException();

         return getJavacTrees(CompilationTask.class, task);

     }

     /**

      * Gets a Trees object for a given ProcessingEnvironment.

      * @param env the processing environment for which to get the Trees object

      * @throws IllegalArgumentException if the env does not support the Trees API.

      */

     public static Trees instance(ProcessingEnvironment env) {

         if (!env.getClass().getName().equals("com.sun.tools.javac.processing.JavacProcessingEnvironment"))

             throw new IllegalArgumentException();

         return getJavacTrees(ProcessingEnvironment.class, env);

     }

     static Trees getJavacTrees(Class<?> argType, Object arg) {

         try {

             ClassLoader cl = arg.getClass().getClassLoader();

             Class<?> c = Class.forName("com.sun.tools.javac.api.JavacTrees", false, cl);

             argType = Class.forName(argType.getName(), false, cl);

             Method m = c.getMethod("instance", new Class<?>[] { argType });

             return (Trees) m.invoke(null, new Object[] { arg });

         } catch (Throwable e) {

             throw new AssertionError(e);

         }

     }

     /**

      * Gets a utility object for obtaining source positions.

      */

     public abstract SourcePositions getSourcePositions();

     /**

      * Gets the Tree node for a given Element.

      * Returns null if the node can not be found.

      */

     public abstract Tree getTree(Element element);

     /**

      * Gets the ClassTree node for a given TypeElement.

      * Returns null if the node can not be found.

      */

     public abstract ClassTree getTree(TypeElement element);

     /**

      * Gets the MethodTree node for a given ExecutableElement.

      * Returns null if the node can not be found.

      */

     public abstract MethodTree getTree(ExecutableElement method);

     /**

      * Gets the Tree node for an AnnotationMirror on a given Element.

      * Returns null if the node can not be found.

      */

     public abstract Tree getTree(Element e, AnnotationMirror a);

     /**

      * Gets the Tree node for an AnnotationValue for an AnnotationMirror on a given Element.

      * Returns null if the node can not be found.

      */

     public abstract Tree getTree(Element e, AnnotationMirror a, AnnotationValue v);

     /**

      * Gets the path to tree node within the specified compilation unit.

      */

     public abstract TreePath getPath(CompilationUnitTree unit, Tree node);

     /**

      * Gets the TreePath node for a given Element.

      * Returns null if the node can not be found.

      */

     public abstract TreePath getPath(Element e);

     /**

      * Gets the TreePath node for an AnnotationMirror on a given Element.

      * Returns null if the node can not be found.

      */

     public abstract TreePath getPath(Element e, AnnotationMirror a);

     /**

      * Gets the TreePath node for an AnnotationValue for an AnnotationMirror on a given Element.

      * Returns null if the node can not be found.

      */

     public abstract TreePath getPath(Element e, AnnotationMirror a, AnnotationValue v);

     /**

      * Gets the Element for the Tree node identified by a given TreePath.

      * Returns null if the element is not available.

      * @throws IllegalArgumentException is the TreePath does not identify

      * a Tree node that might have an associated Element.

      */

     public abstract Element getElement(TreePath path);

     /**

      * Gets the TypeMirror for the Tree node identified by a given TreePath.

      * Returns null if the TypeMirror is not available.

      * @throws IllegalArgumentException is the TreePath does not identify

      * a Tree node that might have an associated TypeMirror.

      */

     public abstract TypeMirror getTypeMirror(TreePath path);

     /**

      * Gets the Scope for the Tree node identified by a given TreePath.

      * Returns null if the Scope is not available.

      */

     public abstract Scope getScope(TreePath path);

     /**

      * Gets the doc comment, if any, for the Tree node identified by a given TreePath.

      * Returns null if no doc comment was found.

      * @see DocTrees#getDocCommentTree(TreePath)

      */

     public abstract String getDocComment(TreePath path);

     /**

      * Checks whether a given type is accessible in a given scope.

      * @param scope the scope to be checked

      * @param type the type to be checked

      * @return true if {@code type} is accessible

      */

     public abstract boolean isAccessible(Scope scope, TypeElement type);

     /**

      * Checks whether the given element is accessible as a member of the given

      * type in a given scope.

      * @param scope the scope to be checked

      * @param member the member to be checked

      * @param type the type for which to check if the member is accessible

      * @return true if {@code member} is accessible in {@code type}

      */

     public abstract boolean isAccessible(Scope scope, Element member, DeclaredType type);

     /**

       * Gets the original type from the ErrorType object.

       * @param errorType The errorType for which we want to get the original type.

       * @return javax.lang.model.type.TypeMirror corresponding to the original type, replaced by the ErrorType.

       */

     public abstract TypeMirror getOriginalType(ErrorType errorType);

     /**

      * Prints a message of the specified kind at the location of the

      * tree within the provided compilation unit

      *

      * @param kind the kind of message

      * @param msg  the message, or an empty string if none

      * @param t    the tree to use as a position hint

      * @param root the compilation unit that contains tree

      */

     public abstract void printMessage(Diagnostic.Kind kind, CharSequence msg,

             com.sun.source.tree.Tree t,

             com.sun.source.tree.CompilationUnitTree root);

     /**

      * Gets the lub of an exception parameter declared in a catch clause.

      * @param tree the tree for the catch clause

      * @return The lub of the exception parameter

      */

     public abstract TypeMirror getLub(CatchTree tree);

 }