/*

 * Copyright 2008-2009 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.nio.fs;

import java.nio.file.attribute.*;

import java.io.IOException;

import java.util.*;

/**

 * Base implementation of FileStoreSpaceAttributeView

 */

abstract class AbstractFileStoreSpaceAttributeView

    implements FileStoreSpaceAttributeView

{

    private static final String TOTAL_SPACE_NAME = "totalSpace";

    private static final String USABLE_SPACE_NAME = "usableSpace";

    private static final String UNALLOCATED_SPACE_NAME = "unallocatedSpace";

    @Override

    public final String name() {

        return "space";

    }

    @Override

    public final Object getAttribute(String attribute) throws IOException {

        FileStoreSpaceAttributes attrs = readAttributes();

        if (attribute.equals(TOTAL_SPACE_NAME))

            return attrs.totalSpace();

        if (attribute.equals(USABLE_SPACE_NAME))

            return attrs.usableSpace();

        if (attribute.equals(UNALLOCATED_SPACE_NAME))

            return attrs.unallocatedSpace();

        return null;

    }

    @Override

    public final void setAttribute(String attribute, Object value)

        throws IOException

    {

        if (attribute == null || value == null)

            throw new NullPointerException();

        throw new UnsupportedOperationException();

    }

    @Override

    public final Map<String,?> readAttributes(String first, String[] rest)

        throws IOException

    {

        boolean total = false;

        boolean usable = false;

        boolean unallocated = false;

        if (first.equals(TOTAL_SPACE_NAME)) total = true;

        else if (first.equals(USABLE_SPACE_NAME)) usable = true;

        else if (first.equals(UNALLOCATED_SPACE_NAME)) unallocated = true;

        else if (first.equals("*")) {

            total = true;

            usable = true;

            unallocated = true;

        }

        if (!total || !usable || !unallocated) {

            for (String attribute: rest) {

                if (attribute.equals("*")) {

                    total = true;

                    usable = true;

                    unallocated = true;

                    break;

                }

                if (attribute.equals(TOTAL_SPACE_NAME)) {

                    total = true;

                    continue;

                }

                if (attribute.equals(USABLE_SPACE_NAME)) {

                    usable = true;

                    continue;

                }

                if (attribute.equals(UNALLOCATED_SPACE_NAME)) {

                    unallocated = true;

                    continue;

                }

            }

        }

        FileStoreSpaceAttributes attrs = readAttributes();

        Map<String,Object> result = new HashMap<String,Object>(2);

        if (total)

            result.put(TOTAL_SPACE_NAME, attrs.totalSpace());

        if (usable)

            result.put(USABLE_SPACE_NAME, attrs.usableSpace());

        if (unallocated)

            result.put(UNALLOCATED_SPACE_NAME, attrs.unallocatedSpace());

        return Collections.unmodifiableMap(result);

    }

}