src/share/classes/com/sun/source/util/DocTrees.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
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 * 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
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package com.sun.source.util;

import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.Element;
import javax.tools.JavaCompiler.CompilationTask;

import com.sun.source.doctree.DocCommentTree;
import javax.tools.Diagnostic;

/**
 * Provides access to syntax trees for doc comments.
 *
 * @since 1.8
 */
@jdk.Exported
public abstract class DocTrees extends Trees {
    /**
     * Returns a DocTrees object for a given CompilationTask.
     * @param task the compilation task for which to get the Trees object
     * @return the DocTrees object
     * @throws IllegalArgumentException if the task does not support the Trees API.
     */
    public static DocTrees instance(CompilationTask task) {
        return (DocTrees) Trees.instance(task);
    }

    /**
     * Returns a DocTrees object for a given ProcessingEnvironment.
     * @param env the processing environment for which to get the Trees object
     * @return the DocTrees object
     * @throws IllegalArgumentException if the env does not support the Trees API.
     */
    public static DocTrees instance(ProcessingEnvironment env) {
        if (!env.getClass().getName().equals("com.sun.tools.javac.processing.JavacProcessingEnvironment"))
            throw new IllegalArgumentException();
        return (DocTrees) getJavacTrees(ProcessingEnvironment.class, env);
    }

    /**
     * Returns the doc comment tree, if any, for the Tree node identified by a given TreePath.
     * Returns {@code null} if no doc comment was found.
     * @param path the path for the tree node
     * @return the doc comment tree
     */
    public abstract DocCommentTree getDocCommentTree(TreePath path);

    /**
     * Returns the language model element referred to by the leaf node of the given
     * {@link DocTreePath}, or {@code null} if unknown.
     * @param path the path for the tree node
     * @return the element
     */
    public abstract Element getElement(DocTreePath path);

    /**
     * Returns a utility object for accessing the source positions
     * of documentation tree nodes.
     * @return the utility object
     */
    public abstract DocSourcePositions getSourcePositions();

    /**
     * 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 c    the doc comment 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.doctree.DocTree t,
            com.sun.source.doctree.DocCommentTree c,
            com.sun.source.tree.CompilationUnitTree root);
}