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264 lines
9.9 KiB
Java
264 lines
9.9 KiB
Java
/*
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* Copyright (c) 2005, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.source.util;
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import java.lang.reflect.Method;
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import javax.annotation.processing.ProcessingEnvironment;
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import javax.lang.model.element.AnnotationMirror;
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import javax.lang.model.element.AnnotationValue;
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import javax.lang.model.element.Element;
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import javax.lang.model.element.ExecutableElement;
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import javax.lang.model.element.TypeElement;
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import javax.lang.model.type.DeclaredType;
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import javax.lang.model.type.ErrorType;
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import javax.lang.model.type.TypeMirror;
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import javax.tools.Diagnostic;
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import javax.tools.JavaCompiler.CompilationTask;
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import com.sun.source.tree.CatchTree;
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import com.sun.source.tree.ClassTree;
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import com.sun.source.tree.CompilationUnitTree;
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import com.sun.source.tree.MethodTree;
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import com.sun.source.tree.Scope;
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import com.sun.source.tree.Tree;
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/**
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* Bridges JSR 199, JSR 269, and the Tree API.
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*
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* @author Peter von der Ahé
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*/
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public abstract class Trees {
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/**
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* Constructor for subclasses to call.
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*/
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public Trees() {}
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/**
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* Returns a Trees object for a given CompilationTask.
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* @param task the compilation task for which to get the Trees object
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* @throws IllegalArgumentException if the task does not support the Trees API.
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* @return the Trees object
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*/
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public static Trees instance(CompilationTask task) {
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String taskClassName = task.getClass().getName();
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if (!taskClassName.equals("com.sun.tools.javac.api.JavacTaskImpl")
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&& !taskClassName.equals("com.sun.tools.javac.api.BasicJavacTask"))
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throw new IllegalArgumentException();
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return getJavacTrees(CompilationTask.class, task);
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}
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/**
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* Returns a Trees object for a given ProcessingEnvironment.
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* @param env the processing environment for which to get the Trees object
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* @throws IllegalArgumentException if the env does not support the Trees API.
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* @return the Trees object
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*/
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public static Trees instance(ProcessingEnvironment env) {
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if (!env.getClass().getName().equals("com.sun.tools.javac.processing.JavacProcessingEnvironment"))
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throw new IllegalArgumentException();
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return getJavacTrees(ProcessingEnvironment.class, env);
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}
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static Trees getJavacTrees(Class<?> argType, Object arg) {
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try {
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ClassLoader cl = arg.getClass().getClassLoader();
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Class<?> c = Class.forName("com.sun.tools.javac.api.JavacTrees", false, cl);
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argType = Class.forName(argType.getName(), false, cl);
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Method m = c.getMethod("instance", argType);
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return (Trees) m.invoke(null, arg);
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} catch (ReflectiveOperationException e) {
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throw new AssertionError(e);
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}
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}
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/**
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* Returns a utility object for obtaining source positions.
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* @return the utility object for obtaining source positions
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*/
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public abstract SourcePositions getSourcePositions();
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/**
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* Returns the Tree node for a given Element.
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* Returns {@code null} if the node can not be found.
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* @param element the element
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* @return the tree node
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*/
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public abstract Tree getTree(Element element);
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/**
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* Returns the ClassTree node for a given TypeElement.
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* Returns {@code null} if the node can not be found.
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* @param element the element
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* @return the class tree node
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*/
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public abstract ClassTree getTree(TypeElement element);
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/**
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* Returns the MethodTree node for a given ExecutableElement.
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* Returns {@code null} if the node can not be found.
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* @param method the executable element
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* @return the method tree node
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*/
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public abstract MethodTree getTree(ExecutableElement method);
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/**
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* Returns the Tree node for an AnnotationMirror on a given Element.
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* Returns {@code null} if the node can not be found.
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* @param e the element
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* @param a the annotation mirror
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* @return the tree node
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*/
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public abstract Tree getTree(Element e, AnnotationMirror a);
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/**
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* Returns the Tree node for an AnnotationValue for an AnnotationMirror on a given Element.
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* Returns {@code null} if the node can not be found.
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* @param e the element
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* @param a the annotation mirror
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* @param v the annotation value
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* @return the tree node
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*/
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public abstract Tree getTree(Element e, AnnotationMirror a, AnnotationValue v);
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/**
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* Returns the path to tree node within the specified compilation unit.
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* @param unit the compilation unit
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* @param node the tree node
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* @return the tree path
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*/
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public abstract TreePath getPath(CompilationUnitTree unit, Tree node);
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/**
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* Returns the TreePath node for a given Element.
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* Returns {@code null} if the node can not be found.
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* @param e the element
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* @return the tree path
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*/
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public abstract TreePath getPath(Element e);
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/**
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* Returns the TreePath node for an AnnotationMirror on a given Element.
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* Returns {@code null} if the node can not be found.
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* @param e the element
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* @param a the annotation mirror
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* @return the tree path
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*/
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public abstract TreePath getPath(Element e, AnnotationMirror a);
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/**
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* Returns the TreePath node for an AnnotationValue for an AnnotationMirror on a given Element.
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* Returns {@code null} if the node can not be found.
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* @param e the element
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* @param a the annotation mirror
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* @param v the annotation value
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* @return the tree path
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*/
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public abstract TreePath getPath(Element e, AnnotationMirror a, AnnotationValue v);
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/**
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* Returns the Element for the Tree node identified by a given TreePath.
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* Returns {@code null} if the element is not available.
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* @param path the tree path
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* @return the element
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* @throws IllegalArgumentException is the TreePath does not identify
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* a Tree node that might have an associated Element.
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*/
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public abstract Element getElement(TreePath path);
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/**
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* Returns the TypeMirror for the Tree node identified by a given TreePath.
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* Returns {@code null} if the TypeMirror is not available.
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* @param path the tree path
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* @return the type mirror
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* @throws IllegalArgumentException is the TreePath does not identify
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* a Tree node that might have an associated TypeMirror.
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*/
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public abstract TypeMirror getTypeMirror(TreePath path);
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/**
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* Returns the Scope for the Tree node identified by a given TreePath.
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* Returns {@code null} if the Scope is not available.
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* @param path the tree path
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* @return the scope
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*/
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public abstract Scope getScope(TreePath path);
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/**
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* Returns the doc comment, if any, for the Tree node identified by a given TreePath.
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* Returns {@code null} if no doc comment was found.
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* @see DocTrees#getDocCommentTree(TreePath)
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* @param path the tree path
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* @return the doc comment
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*/
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public abstract String getDocComment(TreePath path);
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/**
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* Checks whether a given type is accessible in a given scope.
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* @param scope the scope to be checked
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* @param type the type to be checked
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* @return true if {@code type} is accessible
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*/
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public abstract boolean isAccessible(Scope scope, TypeElement type);
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/**
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* Checks whether the given element is accessible as a member of the given
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* type in a given scope.
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* @param scope the scope to be checked
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* @param member the member to be checked
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* @param type the type for which to check if the member is accessible
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* @return true if {@code member} is accessible in {@code type}
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*/
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public abstract boolean isAccessible(Scope scope, Element member, DeclaredType type);
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/**
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* Returns the original type from the ErrorType object.
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* @param errorType The errorType for which we want to get the original type.
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* @return javax.lang.model.type.TypeMirror corresponding to the original type, replaced by the ErrorType.
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*/
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public abstract TypeMirror getOriginalType(ErrorType errorType);
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/**
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* Prints a message of the specified kind at the location of the
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* tree within the provided compilation unit
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*
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* @param kind the kind of message
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* @param msg the message, or an empty string if none
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* @param t the tree to use as a position hint
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* @param root the compilation unit that contains tree
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*/
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public abstract void printMessage(Diagnostic.Kind kind, CharSequence msg,
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com.sun.source.tree.Tree t,
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com.sun.source.tree.CompilationUnitTree root);
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/**
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* Returns the lub of an exception parameter declared in a catch clause.
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* @param tree the tree for the catch clause
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* @return The lub of the exception parameter
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*/
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public abstract TypeMirror getLub(CatchTree tree);
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}
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