/*

 * Copyright (c) 2009, 2018, 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 jdk.nio.zipfs;

import java.io.IOException;

import java.nio.file.FileStore;

import java.nio.file.FileSystems;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.attribute.BasicFileAttributeView;

import java.nio.file.attribute.FileAttributeView;

import java.nio.file.attribute.FileStoreAttributeView;

/**

 * @author Xueming Shen, Rajendra Gutupalli, Jaya Hangal

 */

class ZipFileStore extends FileStore {

    private final ZipFileSystem zfs;

    ZipFileStore(ZipPath zpath) {

        this.zfs = zpath.getFileSystem();

    }

    @Override

    public String name() {

        return zfs.toString() + "/";

    }

    @Override

    public String type() {

        return "zipfs";

    }

    @Override

    public boolean isReadOnly() {

        return zfs.isReadOnly();

    }

    @Override

    public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) {

        return (type == BasicFileAttributeView.class ||

                type == ZipFileAttributeView.class);

    }

    @Override

    public boolean supportsFileAttributeView(String name) {

        return name.equals("basic") || name.equals("zip");

    }

    @Override

    public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> type) {

        if (type == null)

            throw new NullPointerException();

        return (V)null;

    }

    @Override

    public long getTotalSpace() throws IOException {

         return new ZipFileStoreAttributes(this).totalSpace();

    }

    @Override

    public long getUsableSpace() throws IOException {

         return new ZipFileStoreAttributes(this).usableSpace();

    }

    @Override

    public long getUnallocatedSpace() throws IOException {

         return new ZipFileStoreAttributes(this).unallocatedSpace();

    }

    @Override

    public Object getAttribute(String attribute) throws IOException {

         if (attribute.equals("totalSpace"))

               return getTotalSpace();

         if (attribute.equals("usableSpace"))

               return getUsableSpace();

         if (attribute.equals("unallocatedSpace"))

               return getUnallocatedSpace();

         throw new UnsupportedOperationException("does not support the given attribute");

    }

    private static class ZipFileStoreAttributes {

        final FileStore fstore;

        final long size;

        public ZipFileStoreAttributes(ZipFileStore fileStore)

            throws IOException

        {

            Path path = FileSystems.getDefault().getPath(fileStore.name());

            this.size = Files.size(path);

            this.fstore = Files.getFileStore(path);

        }

        public long totalSpace() {

            return size;

        }

        public long usableSpace() throws IOException {

            if (!fstore.isReadOnly())

                return fstore.getUsableSpace();

            return 0;

        }

        public long unallocatedSpace()  throws IOException {

            if (!fstore.isReadOnly())

                return fstore.getUnallocatedSpace();

            return 0;

        }

    }

}