/*
 * Copyright 2002-2004 the original author or authors.
 * 
 * Licensed 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.springframework.web.multipart.support;

import java.beans.PropertyEditorSupport;
import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.web.multipart.MultipartFile;

/**
 * Custom PropertyEditor for converting MultipartFiles to Strings.
 * Allows to specify the charset to use.
 * @author Juergen Hoeller
 * @since 13.10.2003
 */
public class StringMultipartFileEditor extends PropertyEditorSupport {

	protected final Log logger = LogFactory.getLog(getClass());

	private String charsetName;

	/**
	 * Create a new StringMultipartFileEditor, using the default charset.
	 */
	public StringMultipartFileEditor() {
	}

	/**
	 * Create a new StringMultipartFileEditor, using the given charset.
	 * @param charsetName valid charset name
	 * @see java.lang.String#String(byte[],String)
	 */
	public StringMultipartFileEditor(String charsetName) {
		this.charsetName = charsetName;
	}

	public void setValue(Object value) {
		if (value instanceof MultipartFile) {
			MultipartFile multipartFile = (MultipartFile) value;
			try {
				super.setValue(this.charsetName != null ?
											 new String(multipartFile.getBytes(), this.charsetName) :
											 new String(multipartFile.getBytes()));
			}
			catch (IOException ex) {
				logger.error("Cannot read contents of multipart file", ex);
				throw new IllegalArgumentException("Cannot read contents of multipart file: " + ex.getMessage());
			}
		}
	}

}
