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package org.jboss.resteasy.plugins.providers.multipart;

import java.util.Map;

/**
 * Represents a multipart/related (RFC2387) incoming mime message. A
 * multipart/related message is used to hold a root or start part and other
 * parts which are referenced from the root part. All parts have a unique id.
 * The type and the id of the start part is presented in parameters in the
 * message content-type header.
 *
 * @author Attila Kiraly
 * @version $Revision: 1 $
 */
public interface MultipartRelatedInput extends MultipartInput {

    /**
     * The type parameter as it was read from the content-type header of the
     * multipart/related message. A well formed multipart/related message always
     * has this parameter. This is the type of the root part of the message. If
     * a content-type header is presented in the root part as well it should
     * hold the same value.
     *
     * @return the type parameter of the content-type header of the message,
     *         null if there was no such parameter
     */
    String getType();

    /**
     * A start parameter is not mandatory in a message. If it is presented it
     * holds the id of the root part.
     *
     * @return the start parameter of the content-type header of the message,
     *         null if there was no such parameter
     */
    String getStart();

    /**
     * Optional.
     *
     * @return the start-info parameter of the content-type header of the
     *         message, null if there was no such parameter
     */
    String getStartInfo();

    /**
     * @return the root part of the message. If a start parameter was set in the
     *         message header the part with that id is returned. If no start
     *         parameter was set the first part is returned.
     */
    InputPart getRootPart();

    /**
     * @return a map holding all parts with their unique id-s as keys. The root
     *         part and the related parts too.
     */
    Map getRelatedMap();
}