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
26package com.sun.tools.javac.parser;
27
28import java.nio.CharBuffer;
29
30import com.sun.tools.javac.code.Source;
31import com.sun.tools.javac.util.Context;
32import com.sun.tools.javac.util.Log;
33import com.sun.tools.javac.util.Names;
34
35
36/**
37 * A factory for creating scanners.
38 *
39 *  <p><b>This is NOT part of any supported API.
40 *  If you write code that depends on this, you do so at your own
41 *  risk.  This code and its internal interfaces are subject to change
42 *  or deletion without notice.</b>
43 */
44public class ScannerFactory {
45    /** The context key for the scanner factory. */
46    public static final Context.Key<ScannerFactory> scannerFactoryKey = new Context.Key<>();
47
48    /** Get the Factory instance for this context. */
49    public static ScannerFactory instance(Context context) {
50        ScannerFactory instance = context.get(scannerFactoryKey);
51        if (instance == null)
52            instance = new ScannerFactory(context);
53        return instance;
54    }
55
56    final Log log;
57    final Names names;
58    final Source source;
59    final Tokens tokens;
60
61    /** Create a new scanner factory. */
62    protected ScannerFactory(Context context) {
63        context.put(scannerFactoryKey, this);
64        this.log = Log.instance(context);
65        this.names = Names.instance(context);
66        this.source = Source.instance(context);
67        this.tokens = Tokens.instance(context);
68    }
69
70    public Scanner newScanner(CharSequence input, boolean keepDocComments) {
71        if (input instanceof CharBuffer) {
72            CharBuffer buf = (CharBuffer) input;
73            if (keepDocComments)
74                return new Scanner(this, new JavadocTokenizer(this, buf));
75            else
76                return new Scanner(this, buf);
77        } else {
78            char[] array = input.toString().toCharArray();
79            return newScanner(array, array.length, keepDocComments);
80        }
81    }
82
83    public Scanner newScanner(char[] input, int inputLength, boolean keepDocComments) {
84        if (keepDocComments)
85            return new Scanner(this, new JavadocTokenizer(this, input, inputLength));
86        else
87            return new Scanner(this, input, inputLength);
88    }
89}
90