/*
    * ====================================================================
    * 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.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 an input stream.
   *
   * @see org.apache.http.entity.mime.MultipartEntityBuilder
   *
   * @since 4.0
   */
  public class InputStreamBody extends AbstractContentBody {
  
  	private final InputStream in;
  	private final String filename;
  
  	/**
  	 * @since 4.1
  	 *
  	 */
  	public InputStreamBody(final InputStream in, final String mimeType,
  			final String filename) {
  		this(in, ContentType.create(mimeType), filename);
  	}
  
  	public InputStreamBody(final InputStream in, final String filename) {
  		this(in, ContentType.DEFAULT_BINARY, filename);
  	}
  
  	/**
  	 * @since 4.3
  	 */
  	public InputStreamBody(final InputStream in, final ContentType contentType,
  			final String filename) {
  		super(contentType);
  		this.in = in;
  		this.filename = filename;
  	}
  
  	/**
  	 * @since 4.3
  	 */
  	public InputStreamBody(final InputStream in, final ContentType contentType) {
  		this(in, contentType, null);
  	}
  
  	public InputStream getInputStream() {
  		return this.in;
  	}
  
  	@Override
  	public void writeTo(final OutputStream out) throws IOException {
  		try {
  			final byte[] tmp = new byte[4096];
  			int l;
  			while ((l = this.in.read(tmp)) != -1) {
  				out.write(tmp, 0, l);
  			}
  			out.flush();
  		} finally {
  			this.in.close();
  		}
  	}
  
  	@Override
  	public String getTransferEncoding() {
  		return MIME.ENC_BINARY;
 	}
 
 	@Override
 	public long getContentLength() {
 		try {
 			return in.available();
 		} catch (IOException e) {
 			return -1;
 		}
 	}
 
 	@Override
 	public String getFilename() {
 		return this.filename;
 	}
 
 }