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/*
 * Copyright (c) 2008, Christophe Delory
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY CHRISTOPHE DELORY ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL CHRISTOPHE DELORY BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package chameleon;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import chameleon.content.ContentMetadataCenter;
import chameleon.content.type.ContentType;
import chameleon.content.type.ContentTypeFactory;
import chameleon.playlist.BasePlaylistVisitor;
import chameleon.playlist.Media;

/**
 * Fetches if possible the metadata of all media contents.
 * @version $Revision: 90 $
 * @author Christophe Delory
 */
public class FetchContentMetadata extends BasePlaylistVisitor
{
    /**
     * The logger.
     */
    private final Log _logger = LogFactory.getLog(getClass()); // May throw LogConfigurationException.

    /**
     * Specifies if we must connect to the media content URL in order to fetch additional metadata.
     */
    private boolean _connect = false;

    /**
     * Specifies if we must connect to the media content URL in order to fetch additional metadata.
     * Defaults to false.
     * @param connect the corresponding boolean.
     */
    public void setConnect(final boolean connect)
    {
        _connect = connect;
    }

    @Override
    public void beginVisitMedia(final Media target) throws Exception
    {
        if (target.getSource() != null)
        {
            if (_connect)
            {
                try
                {
                    target.getSource().connect(); // May throw IOException, SecurityException, IllegalArgumentException.
                }
                catch (Exception e)
                {
                    _logger.warn("Cannot access media content " + target.getSource(), e);
                }

                ContentMetadataCenter.getInstance().fillMetadata(target.getSource());
            }

            // Override the type, if we can find a valid one.
            try
            {
                final ContentType contentType = ContentTypeFactory.getInstance().getContentType(target.getSource().getURI()); // May throw SecurityException, URISyntaxException.

                if (contentType != null)
                {
                    target.getSource().setType(contentType.getMimeTypes()[0]);
                }
            }
            catch (Exception e)
            {
                _logger.warn("Cannot build URI for media content " + target.getSource(), e);
            }
        }
    }
}