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package org.directwebremoting.dwrp;

import java.io.IOException;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.directwebremoting.extend.FormField;
import org.directwebremoting.extend.ServerException;

/**
 * An interface to allow us to plug alternative FileUpload components into DWR,
 * and more specifically, to plug in a null implementation if file commons
 * file-upload.jar is not available on the classpath.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface FileUpload
{
    /**
     * Process an inbound request into a set of name/value pairs where the
     * values could be file uploads.
     * @param req The request to parse
     * @return A map of the fields in the input request
     * @throws ServerException If there is an {@link IOException} while reading the request
     */
    public Map parseRequest(HttpServletRequest req) throws ServerException;
}