MediaTypeProvider.java

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package org.glassfish.jersey.message.internal;

import java.text.ParseException;
import java.util.Map;

import javax.ws.rs.core.MediaType;

import javax.inject.Singleton;

import org.glassfish.jersey.internal.LocalizationMessages;
import org.glassfish.jersey.spi.HeaderDelegateProvider;
import static org.glassfish.jersey.message.internal.Utils.throwIllegalArgumentExceptionIfNull;

/**
 * Header delegate provider for MediaType.
 *
 * @author Marc Hadley
 * @author Marek Potociar (marek.potociar at oracle.com)
 * @author Martin Matula
 */
@Singleton
public class MediaTypeProvider implements HeaderDelegateProvider<MediaType> {

    private static final String MEDIA_TYPE_IS_NULL = LocalizationMessages.MEDIA_TYPE_IS_NULL();

    @Override
    public boolean supports(Class<?> type) {
        return MediaType.class.isAssignableFrom(type);
    }

    @Override
    public String toString(MediaType header) {

        throwIllegalArgumentExceptionIfNull(header, MEDIA_TYPE_IS_NULL);

        StringBuilder b = new StringBuilder();
        b.append(header.getType()).append('/').append(header.getSubtype());
        for (Map.Entry<String, String> e : header.getParameters().entrySet()) {
            b.append(";").append(e.getKey()).append('=');
            StringBuilderUtils.appendQuotedIfNonToken(b, e.getValue());
        }
        return b.toString();
    }

    @Override
    public MediaType fromString(String header) {

        throwIllegalArgumentExceptionIfNull(header, MEDIA_TYPE_IS_NULL);

        try {
            return valueOf(HttpHeaderReader.newInstance(header));
        } catch (ParseException ex) {
            throw new IllegalArgumentException(
                    "Error parsing media type '" + header + "'", ex);
        }
    }

    /**
     * Create a new {@link javax.ws.rs.core.MediaType} instance from a header reader.
     *
     * @param reader header reader.
     * @return new {@code MediaType} instance.
     *
     * @throws ParseException in case of a header parsing error.
     */
    public static MediaType valueOf(HttpHeaderReader reader) throws ParseException {
        // Skip any white space
        reader.hasNext();

        // Get the type
        final String type = reader.nextToken().toString();
        reader.nextSeparator('/');
        // Get the subtype
        final String subType = reader.nextToken().toString();

        Map<String, String> params = null;

        if (reader.hasNext()) {
            params = HttpHeaderReader.readParameters(reader);
        }

        return new MediaType(type, subType, params);
    }
}