/*

 * Copyright (c) 1998, 2016, 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

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 */

package com.sun.tools.doclets.internal.toolkit.util;

import java.util.Map;

import java.util.WeakHashMap;

import javax.tools.JavaFileManager;

import javax.tools.JavaFileManager.Location;

import javax.tools.StandardJavaFileManager;

import javax.tools.StandardLocation;

import com.sun.tools.doclets.internal.toolkit.Configuration;

/**

 * Factory for DocFile objects.

 *

 *  <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>

 *

 * @since 1.8

 */

abstract class DocFileFactory {

    private static final Map<Configuration, DocFileFactory> factories = new WeakHashMap<>();

    /**

     * Get the appropriate factory, based on the file manager given in the

     * configuration.

     */

    static synchronized DocFileFactory getFactory(Configuration configuration) {

        DocFileFactory f = factories.get(configuration);

        if (f == null) {

            JavaFileManager fm = configuration.getFileManager();

            if (fm instanceof StandardJavaFileManager) {

                f = new StandardDocFileFactory(configuration);

            } else {

                throw new IllegalStateException();

            }

            factories.put(configuration, f);

        }

        return f;

    }

    protected Configuration configuration;

    protected DocFileFactory(Configuration configuration) {

        this.configuration = configuration;

    }

    /** Create a DocFile for a directory. */

    abstract DocFile createFileForDirectory(String file);

    /** Create a DocFile for a file that will be opened for reading. */

    abstract DocFile createFileForInput(String file);

    /** Create a DocFile for a file that will be opened for writing. */

    abstract DocFile createFileForOutput(DocPath path);

    /**

     * List the directories and files found in subdirectories along the

     * elements of the given location.

     * @param location currently, only {@link StandardLocation#SOURCE_PATH} is supported.

     * @param path the subdirectory of the directories of the location for which to

     *  list files

     */

    abstract Iterable<DocFile> list(Location location, DocPath path);

}