/*

 * Copyright (c) 1999, 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.javac.parser;

import java.util.HashMap;

import java.util.Map;

import com.sun.tools.javac.parser.Tokens.Comment;

import com.sun.tools.javac.tree.DCTree.DCDocComment;

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

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

import com.sun.tools.javac.util.DiagnosticSource;

/**

 *

 *  <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>

 */

public class LazyDocCommentTable implements DocCommentTable {

    private static class Entry {

        final Comment comment;

        DCDocComment tree;

        Entry(Comment c) {

            comment = c;

        }

    }

    ParserFactory fac;

    DiagnosticSource diagSource;

    Map<JCTree, Entry> table;

    LazyDocCommentTable(ParserFactory fac) {

        this.fac = fac;

        diagSource = fac.log.currentSource();

    }

    public boolean hasComment(JCTree tree) {

        return table.containsKey(tree);

    }

    public Comment getComment(JCTree tree) {

        Entry e = table.get(tree);

        return (e == null) ? null : e.comment;

    }

    public String getCommentText(JCTree tree) {

        Comment c = getComment(tree);

        return (c == null) ? null : c.getText();

    }

    public DCDocComment getCommentTree(JCTree tree) {

        Entry e = table.get(tree);

        if (e == null)

            return null;

        if (e.tree == null)

            e.tree = new DocCommentParser(fac, diagSource, e.comment).parse();

        return e.tree;

    }

    public void putComment(JCTree tree, Comment c) {

        table.put(tree, new Entry(c));

    }

}