001    /*
002     * Copyright 1999-2008 Sun Microsystems, Inc.  All Rights Reserved.
003     * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004     *
005     * This code is free software; you can redistribute it and/or modify it
006     * under the terms of the GNU General Public License version 2 only, as
007     * published by the Free Software Foundation.  Sun designates this
008     * particular file as subject to the "Classpath" exception as provided
009     * by Sun in the LICENSE file that accompanied this code.
010     *
011     * This code is distributed in the hope that it will be useful, but WITHOUT
012     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013     * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014     * version 2 for more details (a copy is included in the LICENSE file that
015     * accompanied this code).
016     *
017     * You should have received a copy of the GNU General Public License version
018     * 2 along with this work; if not, write to the Free Software Foundation,
019     * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020     *
021     * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022     * CA 95054 USA or visit www.sun.com if you need additional information or
023     * have any questions.
024     */
025    
026    package com.sun.tools.javac.parser;
027    
028    import com.sun.tools.javac.code.Source;
029    import com.sun.tools.javac.tree.TreeMaker;
030    import com.sun.tools.javac.util.Context;
031    import com.sun.tools.javac.util.Log;
032    import com.sun.tools.javac.util.Names;
033    import com.sun.tools.javac.util.Options;
034    
035    /**
036     * A factory for creating parsers.
037     */
038    public class ParserFactory {
039    
040        /** The context key for the parser factory. */
041        protected static final Context.Key<ParserFactory> parserFactoryKey = new Context.Key<ParserFactory>();
042    
043        public static ParserFactory instance(Context context) {
044            ParserFactory instance = context.get(parserFactoryKey);
045            if (instance == null) {
046                instance = new ParserFactory(context);
047            }
048            return instance;
049        }
050    
051        final TreeMaker F;
052        final Log log;
053        final Keywords keywords;
054        final Source source;
055        final Names names;
056        final Options options;
057        final Scanner.Factory scannerFactory;
058    
059        protected ParserFactory(Context context) {
060            super();
061            context.put(parserFactoryKey, this);
062            this.F = TreeMaker.instance(context);
063            this.log = Log.instance(context);
064            this.names = Names.instance(context);
065            this.keywords = Keywords.instance(context);
066            this.source = Source.instance(context);
067            this.options = Options.instance(context);
068            this.scannerFactory = Scanner.Factory.instance(context);
069        }
070    
071        public Parser newParser(CharSequence input, boolean keepDocComments, boolean keepEndPos, boolean keepLineMap) {
072            Lexer lexer = scannerFactory.newScanner(input);
073            if (keepEndPos) {
074                return new EndPosParser(this, lexer, keepDocComments, keepLineMap);
075            } else {
076                return new JavacParser(this, lexer, keepDocComments, keepLineMap);
077            }
078        }
079    }