/*

 * 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.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.

 *

 *  <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. */

    /** 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 Tokens tokens;

    /** 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.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);

    }

}