ParserFactory.java revision 2571:10fc81ac75b4 
1/*
2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.tools.javac.parser;
27
28import java.util.Locale;
29
30import com.sun.tools.javac.code.Source;
31import com.sun.tools.javac.tree.DocTreeMaker;
32import com.sun.tools.javac.tree.TreeMaker;
33import com.sun.tools.javac.util.Context;
34import com.sun.tools.javac.util.Log;
35import com.sun.tools.javac.util.Names;
36import com.sun.tools.javac.util.Options;
37
38/**
39 * A factory for creating parsers.
40 *
41 * <p><b>This is NOT part of any supported API.
42 * If you write code that depends on this, you do so at your own risk.
43 * This code and its internal interfaces are subject to change or
44 * deletion without notice.</b>
45 */
46public class ParserFactory {
47
48    /** The context key for the parser factory. */
49    protected static final Context.Key<ParserFactory> parserFactoryKey = new Context.Key<>();
50
51    public static ParserFactory instance(Context context) {
52        ParserFactory instance = context.get(parserFactoryKey);
53        if (instance == null) {
54            instance = new ParserFactory(context);
55        }
56        return instance;
57    }
58
59    final TreeMaker F;
60    final DocTreeMaker docTreeMaker;
61    final Log log;
62    final Tokens tokens;
63    final Source source;
64    final Names names;
65    final Options options;
66    final ScannerFactory scannerFactory;
67    final Locale locale;
68
69    protected ParserFactory(Context context) {
70        super();
71        context.put(parserFactoryKey, this);
72        this.F = TreeMaker.instance(context);
73        this.docTreeMaker = DocTreeMaker.instance(context);
74        this.log = Log.instance(context);
75        this.names = Names.instance(context);
76        this.tokens = Tokens.instance(context);
77        this.source = Source.instance(context);
78        this.options = Options.instance(context);
79        this.scannerFactory = ScannerFactory.instance(context);
80        this.locale = context.get(Locale.class);
81    }
82
83    public JavacParser newParser(CharSequence input, boolean keepDocComments, boolean keepEndPos, boolean keepLineMap) {
84        Lexer lexer = scannerFactory.newScanner(input, keepDocComments);
85        return new JavacParser(this, lexer, keepDocComments, keepLineMap, keepEndPos);
86    }
87}
88