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package javax.media.protocol;

import javax.media.*;

/**
 * Standard JMF class -- see this class in the JMF Javadoc. Complete
 *
 * @author Ken Larson
 *
 */
public class ContentDescriptor extends Format
{
    public static final String RAW = "raw";

    public static final String RAW_RTP = "raw.rtp";

    // TODO: content types need to have special characters replaced
    // according to mimeTypeToPackageName. If a web server ever returned this
    // content type as application/mixed-data
    // it would be converted to application.mixed_data, and it would never match
    // any demux for MIXED.
    // However, this is how it is defined in JMF.
    public static final String MIXED = "application.mixed-data";

    public static final String CONTENT_UNKNOWN = "UnknownContent";

    private static final boolean isAlpha(char c)
    {
        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
    }

    private static final boolean isNumeric(char c)
    {
        return c >= '0' && c <= '9';
    }

    private static final boolean isUpperAlpha(char c)
    {
        return c >= 'A' && c <= 'Z';
    }

    /**
     * Convert to package name. a-z -> a-z 0-9 -> 0->9 A-Z -> a-z / -> . . -> .
     * everything else -> _
     */
    public static final String mimeTypeToPackageName(String mimeType)
    {
        final StringBuffer b = new StringBuffer();
        for (int i = 0; i < mimeType.length(); ++i)
        {
            char c = mimeType.charAt(i);
            if (c == '/' || c == '.')
                b.append('.');
            else if (isAlpha(c) || isNumeric(c))
            {
                if (isUpperAlpha(c))
                    b.append(Character.toLowerCase(c));
                else
                    b.append(c);
            } else
                b.append('_');
        }
        return b.toString();
    }

    public ContentDescriptor(String cdName)
    {
        super(cdName);
        dataType = byteArray;
    }

    public String getContentType()
    {
        return super.getEncoding();
    }

    @Override
    public String toString()
    {
        return getContentType();
    }

}