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/*
 * Copyright 2011 Stephen Connolly
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.codehaus.mojo.mrm.api;

import java.io.IOException;

/**
 * Default implementation of {@link DirectoryEntry}.
 *
 * @since 1.0
 */
public class DefaultDirectoryEntry
    extends AbstractEntry
    implements DirectoryEntry
{
    /**
     * Ensure consistent serialization.
     *
     * @since 1.0
     */
    private static final long serialVersionUID = 1L;

    /**
     * Creates an entry in the specified file system with the specified parent and name.
     *
     * @param fileSystem The filesystem.
     * @param parent     The parent (or null if this is the root entry).
     * @param name       The name of the entry (or the empty string if this is the root entry).
     * @since 1.0
     */
    public DefaultDirectoryEntry( FileSystem fileSystem, DirectoryEntry parent, String name )
    {
        super( fileSystem, parent, name );
    }

    /**
     * Creates a {@link DefaultDirectoryEntry} that is equivalent to the supplied {@link DirectoryEntry} only in
     * the specified target {@link FileSystem}.
     *
     * @param target    the filesystem.
     * @param directory the directory.
     * @return a {@link DirectoryEntry} in the target filesystem.
     * @since 1.0
     */
    public static DirectoryEntry equivalent( FileSystem target, DirectoryEntry directory )
    {
        if ( target.equals( directory.getFileSystem() ) )
        {
            return directory;
        }
        if ( directory.getParent() == null )
        {
            return target.getRoot();
        }
        return new DefaultDirectoryEntry( target, equivalent( target, directory.getParent() ), directory.getName() );
    }

    /**
     * {@inheritDoc}
     */
    public long getLastModified()
        throws IOException
    {
        return getFileSystem().getLastModified( this );
    }
}