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package org.apache.catalina.fileupload;

import java.io.IOException;
import java.io.InputStream;


/**
 *  This interface provides access to a file or form item that was
 * received within a multipart/form-data POST request.
 * The items contents are retrieved by calling {@link #openStream()}.
 * Instances of this class are created by accessing the
 * iterator, returned by * {@link RequestItemIterator()}.
 *
 * Original authors from org.apache.common.fileupload.FileItem:
 * @author Rafal Krzewski
 * @author Sean Legassick
 * @author Jason van Zyl
 * @author Martin Cooper
 *
 * Adopted for Glassfish:
 * @author Kin-man Chung
 */

interface RequestItem {

    /** Creates an {@link InputStream}, which allows to read the
     * items contents.
     * @return The input stream, from which the items data may
     *   be read.
     * @throws IllegalStateException The method was already invoked on
     * this item. It is not possible to recreate the data stream.
     * @throws IOException An I/O error occurred.
     * @see ItemSkippedException
     */
    InputStream openStream() throws IOException;

    /**
     * Closes the file item.
     * @throws IOException An I/O error occurred.
     */
    void close() throws IOException;

    /**
     * Returns the content type passed by the browser or null if
     * not defined.
     *
     * @return The content type passed by the browser or null if
     *         not defined.
     */
    String getContentType();

    /**
     * Returns the original filename in the client's filesystem, as provided by
     * the browser (or other client software). In most cases, this will be the
     * base file name, without path information. However, some clients, such as
     * the Opera browser, do include path information.
     *
     * @return The original filename in the client's filesystem.
     */
    String getSubmittedFileName();

    /**
     * Returns the name of the field in the multipart form corresponding to
     * this file item.
     *
     * @return The name of the form field.
     */
    String getFieldName();

    /**
     * Determines whether or not a FileItem instance represents
     * a simple form field.
     *
     * @return true if the instance represents a simple form
     *         field; false if it represents an uploaded file.
     */
    boolean isFormField();
    
    /**
     * Returns the item headers.
     * @return The items header object
     */
    public PartHeaders getHeaders();

}