/*
 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.tools.javac.parser;

import java.nio.CharBuffer;

import com.sun.tools.javac.code.Preview;
import com.sun.tools.javac.code.Source;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Log;
import com.sun.tools.javac.util.Names;


A factory for creating scanners.
 
This is NOT part of any supported API.
 If you write code that depends on this, you do so at your own
 risk.  This code and its internal interfaces are subject to change
 or deletion without notice.
/**
 * A factory for creating scanners.
 *
 *  <p><b>This is NOT part of any supported API.
 *  If you write code that depends on this, you do so at your own
 *  risk.  This code and its internal interfaces are subject to change
 *  or deletion without notice.</b>
 */
public class ScannerFactory {
    
The context key for the scanner factory. /** The context key for the scanner factory. */
    public static final Context.Key<ScannerFactory> scannerFactoryKey = new Context.Key<>();

    
Get the Factory instance for this context. /** Get the Factory instance for this context. */
    public static ScannerFactory instance(Context context) {
        ScannerFactory instance = context.get(scannerFactoryKey);
        if (instance == null)
            instance = new ScannerFactory(context);
        return instance;
    }

    final Log log;
    final Names names;
    final Source source;
    final Preview preview;
    final Tokens tokens;

    
Create a new scanner factory. /** Create a new scanner factory. */
    protected ScannerFactory(Context context) {
        context.put(scannerFactoryKey, this);
        this.log = Log.instance(context);
        this.names = Names.instance(context);
        this.source = Source.instance(context);
        this.preview = Preview.instance(context);
        this.tokens = Tokens.instance(context);
    }

    public Scanner newScanner(CharSequence input, boolean keepDocComments) {
        if (input instanceof CharBuffer) {
            CharBuffer buf = (CharBuffer) input;
            if (keepDocComments)
                return new Scanner(this, new JavadocTokenizer(this, buf));
            else
                return new Scanner(this, buf);
        } else {
            char[] array = input.toString().toCharArray();
            return newScanner(array, array.length, keepDocComments);
        }
    }

    public Scanner newScanner(char[] input, int inputLength, boolean keepDocComments) {
        if (keepDocComments)
            return new Scanner(this, new JavadocTokenizer(this, input, inputLength));
        else
            return new Scanner(this, input, inputLength);
    }
}