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    1   /*
    2    * Copyright (c) 1999, 2010, 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   
   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.Names;
   33   import com.sun.tools.javac.util.Options;
   34   
   35   /**
   36    * A factory for creating parsers.
   37    *
   38    * <p><b>This is NOT part of any supported API.
   39    * If you write code that depends on this, you do so at your own risk.
   40    * This code and its internal interfaces are subject to change or
   41    * deletion without notice.</b>
   42    */
   43   public class ParserFactory {
   44   
   45       /** The context key for the parser factory. */
   46       protected static final Context.Key<ParserFactory> parserFactoryKey = new Context.Key<ParserFactory>();
   47   
   48       public static ParserFactory instance(Context context) {
   49           ParserFactory instance = context.get(parserFactoryKey);
   50           if (instance == null) {
   51               instance = new ParserFactory(context);
   52           }
   53           return instance;
   54       }
   55   
   56       final TreeMaker F;
   57       final Log log;
   58       final Keywords keywords;
   59       final Source source;
   60       final Names names;
   61       final Options options;
   62       final ScannerFactory scannerFactory;
   63   
   64       protected ParserFactory(Context context) {
   65           super();
   66           context.put(parserFactoryKey, this);
   67           this.F = TreeMaker.instance(context);
   68           this.log = Log.instance(context);
   69           this.names = Names.instance(context);
   70           this.keywords = Keywords.instance(context);
   71           this.source = Source.instance(context);
   72           this.options = Options.instance(context);
   73           this.scannerFactory = ScannerFactory.instance(context);
   74       }
   75   
   76       public Parser newParser(CharSequence input, boolean keepDocComments, boolean keepEndPos, boolean keepLineMap) {
   77           Lexer lexer = scannerFactory.newScanner(input, keepDocComments);
   78           if (keepEndPos) {
   79               return new EndPosParser(this, lexer, keepDocComments, keepLineMap);
   80           } else {
   81               return new JavacParser(this, lexer, keepDocComments, keepLineMap);
   82           }
   83       }
   84   }

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