1 /*

     2  * Copyright 1999-2008 Sun Microsystems, Inc.  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.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package com.sun.tools.javac.parser;

    27 

    28 import com.sun.tools.javac.code.Source;

    29 import com.sun.tools.javac.tree.TreeMaker;

    30 import com.sun.tools.javac.util.Context;

    31 import com.sun.tools.javac.util.Log;

    32 import com.sun.tools.javac.util.Name;

    33 import com.sun.tools.javac.util.Options;

    34 

    35 /**

    36  * A factory for creating parsers.

    37  */

    38 public class ParserFactory {

    39 

    40     /** The context key for the parser factory. */

    41     protected static final Context.Key<ParserFactory> parserFactoryKey = new Context.Key<ParserFactory>();

    42 

    43     public static ParserFactory instance(Context context) {

    44         ParserFactory instance = context.get(parserFactoryKey);

    45         if (instance == null) {

    46             instance = new ParserFactory(context);

    47         }

    48         return instance;

    49     }

    50 

    51     final TreeMaker F;

    52     final Log log;

    53     final Keywords keywords;

    54     final Source source;

    55     final Name.Table names;

    56     final Options options;

    57     final Scanner.Factory scannerFactory;

    58 

    59     protected ParserFactory(Context context) {

    60         super();

    61         context.put(parserFactoryKey, this);

    62         this.F = TreeMaker.instance(context);

    63         this.log = Log.instance(context);

    64         this.names = Name.Table.instance(context);

    65         this.keywords = Keywords.instance(context);

    66         this.source = Source.instance(context);

    67         this.options = Options.instance(context);

    68         this.scannerFactory = Scanner.Factory.instance(context);

    69     }

    70 

    71     public Parser newParser(CharSequence input, boolean keepDocComments, boolean keepEndPos, boolean keepLineMap) {

    72         Lexer lexer = scannerFactory.newScanner(input);

    73         if (keepEndPos) {

    74             return new EndPosParser(this, lexer, keepDocComments, keepLineMap);

    75         } else {

    76             return new JavacParser(this, lexer, keepDocComments, keepLineMap);

    77         }

    78     }

    79 }