/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package com.foxinmy.weixin4j.http.apache.content;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  import com.foxinmy.weixin4j.http.ContentType;
  import com.foxinmy.weixin4j.http.apache.mime.MIME;
  
  /**
   * Binary body part backed by a file.
   *
   * @see org.apache.http.entity.mime.MultipartEntityBuilder
   *
   * @since 4.0
   */
  public class FileBody extends AbstractContentBody {
  
  	private final File file;
  	private final String filename;
  
  	/**
  	 * @since 4.1
  	 *
  	 */
  	public FileBody(final File file, final String filename,
  			final String mimeType, final String charset) {
  		this(file, ContentType.create(mimeType, charset), filename);
  	}
  
  	/**
  	 * @since 4.1
  	 *
  	 */
  	public FileBody(final File file, final String mimeType, final String charset) {
  		this(file, null, mimeType, charset);
  	}
  
  	/**
       */
  	public FileBody(final File file, final String mimeType) {
  		this(file, ContentType.create(mimeType), null);
  	}
  
  	public FileBody(final File file) {
  		this(file, ContentType.DEFAULT_BINARY, file != null ? file.getName()
  				: null);
  	}
  
  	/**
  	 * @since 4.3
  	 */
  	public FileBody(final File file, final ContentType contentType,
  			final String filename) {
  		super(contentType);
  		this.file = file;
  		this.filename = filename == null ? file.getName() : filename;
  	}
  
  	/**
  	 * @since 4.3
  	 */
  	public FileBody(final File file, final ContentType contentType) {
  		this(file, contentType, file != null ? file.getName() : null);
  	}
  
  	public InputStream getInputStream() throws IOException {
  		return new FileInputStream(this.file);
  	}
  
 	@Override
 	public void writeTo(final OutputStream out) throws IOException {
 		final InputStream in = new FileInputStream(this.file);
 		try {
 			final byte[] tmp = new byte[4096];
 			int l;
 			while ((l = in.read(tmp)) != -1) {
 				out.write(tmp, 0, l);
 			}
 			out.flush();
 		} finally {
 			in.close();
 		}
 	}
 
 	@Override
 	public String getTransferEncoding() {
 		return MIME.ENC_BINARY;
 	}
 
 	@Override
 	public long getContentLength() {
 		return this.file.length();
 	}
 
 	@Override
 	public String getFilename() {
 		return filename;
 	}
 
 	public File getFile() {
 		return this.file;
 	}
 
 }