001/*
002 * Copyright 2002-2017 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.web.multipart.support;
018
019import java.beans.PropertyEditorSupport;
020import java.io.IOException;
021
022import org.springframework.lang.Nullable;
023import org.springframework.web.multipart.MultipartFile;
024
025/**
026 * Custom {@link java.beans.PropertyEditor} for converting
027 * {@link MultipartFile MultipartFiles} to Strings.
028 *
029 * <p>Allows one to specify the charset to use.
030 *
031 * @author Juergen Hoeller
032 * @since 13.10.2003
033 */
034public class StringMultipartFileEditor extends PropertyEditorSupport {
035
036        @Nullable
037        private final String charsetName;
038
039
040        /**
041         * Create a new {@link StringMultipartFileEditor}, using the default charset.
042         */
043        public StringMultipartFileEditor() {
044                this.charsetName = null;
045        }
046
047        /**
048         * Create a new {@link StringMultipartFileEditor}, using the given charset.
049         * @param charsetName valid charset name
050         * @see java.lang.String#String(byte[],String)
051         */
052        public StringMultipartFileEditor(String charsetName) {
053                this.charsetName = charsetName;
054        }
055
056
057        @Override
058        public void setAsText(String text) {
059                setValue(text);
060        }
061
062        @Override
063        public void setValue(Object value) {
064                if (value instanceof MultipartFile) {
065                        MultipartFile multipartFile = (MultipartFile) value;
066                        try {
067                                super.setValue(this.charsetName != null ?
068                                                new String(multipartFile.getBytes(), this.charsetName) :
069                                                new String(multipartFile.getBytes()));
070                        }
071                        catch (IOException ex) {
072                                throw new IllegalArgumentException("Cannot read contents of multipart file", ex);
073                        }
074                }
075                else {
076                        super.setValue(value);
077                }
078        }
079
080}