/*

 * Copyright (c) 2014, 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 jdk.internal.jrtfs;

import java.io.IOException;

import java.nio.file.FileStore;

import java.nio.file.FileSystem;

import java.nio.file.attribute.FileAttributeView;

import java.nio.file.attribute.BasicFileAttributeView;

import java.nio.file.attribute.FileStoreAttributeView;

import java.util.Objects;

/**

 * File store implementation for jrt file systems.

 *

 * @implNote This class needs to maintain JDK 8 source compatibility.

 *

 * It is used internally in the JDK to implement jimage/jrtfs access,

 * but also compiled and delivered as part of the jrtfs.jar to support access

 * to the jimage file provided by the shipped JDK by tools running on JDK 8.

 */

final class JrtFileStore extends FileStore {

    protected final FileSystem jrtfs;

    JrtFileStore(JrtPath jrtPath) {

        this.jrtfs = jrtPath.getFileSystem();

    }

    @Override

    public String name() {

        return jrtfs.toString() + "/";

    }

    @Override

    public String type() {

        return "jrtfs";

    }

    @Override

    public boolean isReadOnly() {

        return jrtfs.isReadOnly();

    }

    @Override

    public boolean supportsFileAttributeView(String name) {

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

    }

    @Override

    @SuppressWarnings("unchecked")

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

        Objects.requireNonNull(type, "type");

        return (V) null;

    }

    @Override

    public long getTotalSpace() throws IOException {

        throw new UnsupportedOperationException("getTotalSpace");

    }

    @Override

    public long getUsableSpace() throws IOException {

        throw new UnsupportedOperationException("getUsableSpace");

    }

    @Override

    public long getUnallocatedSpace() throws IOException {

        throw new UnsupportedOperationException("getUnallocatedSpace");

    }

    @Override

    public Object getAttribute(String attribute) throws IOException {

        throw new UnsupportedOperationException("does not support " + attribute);

    }

    @Override

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

        return type == BasicFileAttributeView.class ||

               type == JrtFileAttributeView.class;

    }

}