001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.fileupload2.javax;
018
019import java.io.IOException;
020import java.util.List;
021import java.util.Map;
022
023import javax.servlet.http.HttpServletRequest;
024
025import org.apache.commons.fileupload2.core.AbstractFileUpload;
026import org.apache.commons.fileupload2.core.FileItem;
027import org.apache.commons.fileupload2.core.FileItemFactory;
028import org.apache.commons.fileupload2.core.FileItemInputIterator;
029import org.apache.commons.fileupload2.core.FileUploadException;
030
031/**
032 * High level API for processing file uploads.
033 * <p>
034 * This class handles multiple files per single HTML widget, sent using {@code multipart/mixed} encoding type, as specified by
035 * <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a>. Use {@link #parseRequest(HttpServletRequest)} to acquire a list of {@link FileItem}s associated
036 * with a given HTML widget.
037 * </p>
038 * <p>
039 * How the data for individual parts is stored is determined by the factory used to create them; a given part may be in memory, on disk, or somewhere else.
040 * </p>
041 *
042 * @param <I> The FileItem type.
043 * @param <F> the FileItemFactory type.
044 */
045public class JavaxServletFileUpload<I extends FileItem<I>, F extends FileItemFactory<I>> extends AbstractFileUpload<HttpServletRequest, I, F> {
046
047    /**
048     * Constant for HTTP POST method.
049     */
050    private static final String POST_METHOD = "POST";
051
052    /**
053     * Tests whether the request contains multipart content.
054     *
055     * @param request The servlet request to be evaluated. Must be non-null.
056     *
057     * @return {@code true} if the request is multipart; {@code false} otherwise.
058     */
059    public static final boolean isMultipartContent(final HttpServletRequest request) {
060        return POST_METHOD.equalsIgnoreCase(request.getMethod()) && AbstractFileUpload.isMultipartContent(new JavaxServletRequestContext(request));
061    }
062
063    /**
064     * Constructs an uninitialized instance of this class. A factory must be configured, using {@code setFileItemFactory()}, before attempting to parse
065     * requests.
066     *
067     * @see AbstractFileUpload#AbstractFileUpload()
068     */
069    public JavaxServletFileUpload() {
070    }
071
072    /**
073     * Constructs an instance of this class which uses the supplied factory to create {@code FileItem} instances.
074     *
075     * @see AbstractFileUpload#AbstractFileUpload()
076     * @param fileItemFactory The factory to use for creating file items.
077     */
078    public JavaxServletFileUpload(final F fileItemFactory) {
079        setFileItemFactory(fileItemFactory);
080    }
081
082    /**
083     * Gets an <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a> compliant {@code multipart/form-data} file item iterator.
084     *
085     * @param request The servlet request to be parsed.
086     * @return An iterator to instances of {@code FileItemInput} parsed from the request, in the order that they were transmitted.
087     * @throws FileUploadException if there are problems reading/parsing the request or storing files.
088     * @throws IOException         An I/O error occurred. This may be a network error while communicating with the client or a problem while storing the
089     *                             uploaded content.
090     */
091    @Override
092    public FileItemInputIterator getItemIterator(final HttpServletRequest request) throws FileUploadException, IOException {
093        return super.getItemIterator(new JavaxServletRequestContext(request));
094    }
095
096    /**
097     * Parses an <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a> compliant {@code multipart/form-data} stream.
098     *
099     * @param request The servlet request to be parsed.
100     * @return A map of {@code FileItem} instances parsed from the request.
101     * @throws FileUploadException if there are problems reading/parsing the request or storing files.
102     */
103    @Override
104    public Map<String, List<I>> parseParameterMap(final HttpServletRequest request) throws FileUploadException {
105        return parseParameterMap(new JavaxServletRequestContext(request));
106    }
107
108    /**
109     * Parses an <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a> compliant {@code multipart/form-data} stream.
110     *
111     * @param request The servlet request to be parsed.
112     * @return A list of {@code FileItem} instances parsed from the request, in the order that they were transmitted.
113     * @throws FileUploadException if there are problems reading/parsing the request or storing files.
114     */
115    @Override
116    public List<I> parseRequest(final HttpServletRequest request) throws FileUploadException {
117        return parseRequest(new JavaxServletRequestContext(request));
118    }
119
120}