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/*
* Copyright (c) 2011, 2020, 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.sun.source.util;
import java.io.IOException;
import java.text.BreakIterator;
import java.util.List;
import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.Element;
import javax.lang.model.element.PackageElement;
import javax.lang.model.type.TypeMirror;
import javax.tools.Diagnostic;
import javax.tools.FileObject;
import javax.tools.JavaCompiler.CompilationTask;
import com.sun.source.doctree.DocCommentTree;
import com.sun.source.doctree.DocTree;
import com.sun.source.doctree.EntityTree;
import com.sun.source.tree.CompilationUnitTree;
/**
* Provides access to syntax trees for doc comments.
*
* @since 1.8
*/
public abstract class DocTrees extends Trees {
/**
* Constructor for subclasses to call.
*/
public DocTrees() {}
/**
* 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 break iterator used to compute the first sentence of
* documentation comments.
* Returns {@code null} if none has been specified.
* @return the break iterator
*
* @since 9
*/
public abstract BreakIterator getBreakIterator();
/**
* 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 doc comment tree of the given element.
* Returns {@code null} if no doc comment was found.
* @param e an element whose documentation is required
* @return the doc comment tree
*
* @since 9
*/
public abstract DocCommentTree getDocCommentTree(Element e);
/**
* Returns the doc comment tree of the given file. The file must be
* an HTML file, in which case the doc comment tree represents the
* entire contents of the file.
* Returns {@code null} if no doc comment was found.
* Future releases may support additional file types.
*
* @param fileObject the content container
* @return the doc comment tree
* @since 9
*/
public abstract DocCommentTree getDocCommentTree(FileObject fileObject);
/**
* Returns the doc comment tree of the given file whose path is
* specified relative to the given element. The file must be an HTML
* file, in which case the doc comment tree represents the contents
* of the <body> tag, and any enclosing tags are ignored.
* Returns {@code null} if no doc comment was found.
* Future releases may support additional file types.
*
* @param e an element whose path is used as a reference
* @param relativePath the relative path from the Element
* @return the doc comment tree
* @throws java.io.IOException if an exception occurs
*
* @since 9
*/
public abstract DocCommentTree getDocCommentTree(Element e, String relativePath) throws IOException;
/**
* Returns a doc tree path containing the doc comment tree of the given file.
* The file must be an HTML file, in which case the doc comment tree represents
* the contents of the {@code } tag, and any enclosing tags are ignored.
* Any references to source code elements contained in {@code @see} and
* {@code {@link}} tags in the doc comment tree will be evaluated in the
* context of the given package element.
* Returns {@code null} if no doc comment was found.
*
* @param fileObject a file object encapsulating the HTML content
* @param packageElement a package element to associate with the given file object
* representing a legacy package.html, null otherwise
* @return a doc tree path containing the doc comment parsed from the given file
* @throws IllegalArgumentException if the fileObject is not an HTML file
*
* @since 9
*/
public abstract DocTreePath getDocTreePath(FileObject fileObject, PackageElement packageElement);
/**
* 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 the language model type referred to by the leaf node of the given
* {@link DocTreePath}, or {@code null} if unknown. This method usually
* returns the same value as {@code getElement(path).asType()} for a
* {@code path} argument for which {@link #getElement(DocTreePath)} returns
* a non-null value, but may return a type that includes additional
* information, such as a parameterized generic type instead of a raw type.
*
* @param path the path for the tree node
* @return the referenced type, or null
*
* @since 15
*/
public abstract TypeMirror getType(DocTreePath path);
/**
* Returns the list of {@link DocTree} representing the first sentence of
* a comment.
*
* @param list the DocTree list to interrogate
* @return the first sentence
*
* @since 9
*/
public abstract List getFirstSentence(List list);
/**
* 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,
DocTree t, DocCommentTree c, CompilationUnitTree root);
/**
* Sets the break iterator to compute the first sentence of
* documentation comments.
* @param breakIterator a break iterator or {@code null} to specify the default
* sentence breaker
*
* @since 9
*/
public abstract void setBreakIterator(BreakIterator breakIterator);
/**
* Returns a utility object for creating {@code DocTree} objects.
* @return a utility object for creating {@code DocTree} objects
*
* @since 9
*/
public abstract DocTreeFactory getDocTreeFactory();
/**
* Returns a string containing the characters for the entity in a given entity tree,
* or {@code null} if the tree does not represent a valid series of characters.
*
* The interpretation of entities is based on section
* 8.1.4. Character references
* in the HTML 5.2 specification.
*
* @param tree the tree containing the entity
* @return a string containing the characters
*/
public abstract String getCharacters(EntityTree tree);
}