/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.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 openStream().
Instances of this class are created by accessing the iterator, returned by FileUploadBase.getItemIterator(RequestContext).
Note: There is an interaction between the iterator and its associated instances of FileItemStream: By invoking Iterator.hasNext() on the iterator, you discard all data, which hasn't been read so far from the previous data.
/**
 * <p> This interface provides access to a file or form item that was
 * received within a <code>multipart/form-data</code> POST request.
 * The items contents are retrieved by calling {@link #openStream()}.</p>
 * <p>Instances of this class are created by accessing the
 * iterator, returned by
 * {@link FileUploadBase#getItemIterator(RequestContext)}.</p>
 * <p><em>Note</em>: There is an interaction between the iterator and
 * its associated instances of {@link FileItemStream}: By invoking
 * {@link java.util.Iterator#hasNext()} on the iterator, you discard all data,
 * which hasn't been read so far from the previous data.</p>
 */
public interface FileItemStream extends FileItemHeadersSupport {

    
This exception is thrown, if an attempt is made to read data from the InputStream, which has been returned by FileItemStream.openStream(), after Iterator.hasNext() has been invoked on the iterator, which created the FileItemStream. /**
     * This exception is thrown, if an attempt is made to read
     * data from the {@link InputStream}, which has been returned
     * by {@link FileItemStream#openStream()}, after
     * {@link java.util.Iterator#hasNext()} has been invoked on the
     * iterator, which created the {@link FileItemStream}.
     */
    public static class ItemSkippedException extends IOException {

        
The exceptions serial version UID, which is being used
when serializing an exception instance.
/**
         * The exceptions serial version UID, which is being used
         * when serializing an exception instance.
         */
        private static final long serialVersionUID = -7280778431581963740L;

    }

    
Creates an InputStream, which allows to read the items contents. 
Throws:
IllegalStateException – The method was already invoked on
this item. It is not possible to recreate the data stream.
IOException – An I/O error occurred.
See Also:
ItemSkippedException
Returns:
The input stream, from which the items data may
  be read./**
     * 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;

    
Returns the content type passed by the browser or null if
not defined.
Returns:
The content type passed by the browser or null if
        not defined./**
     * Returns the content type passed by the browser or <code>null</code> if
     * not defined.
     *
     * @return The content type passed by the browser or <code>null</code> 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.
Returns:
The original filename in the client's filesystem./**
     * 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 getName();

    
Returns the name of the field in the multipart form corresponding to
this file item.
Returns:
The name of the form field./**
     * 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.
Returns:
true if the instance represents a simple form
        field; false if it represents an uploaded file./**
     * Determines whether or not a <code>FileItem</code> instance represents
     * a simple form field.
     *
     * @return <code>true</code> if the instance represents a simple form
     *         field; <code>false</code> if it represents an uploaded file.
     */
    boolean isFormField();

}