/*
    * ====================================================================
    * 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.mime;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  import com.foxinmy.weixin4j.http.ContentType;
  import com.foxinmy.weixin4j.http.entity.HttpEntity;
  
  class MultipartFormEntity implements HttpEntity {
  
  	private final AbstractMultipartForm multipart;
  	private final ContentType contentType;
  	private final long contentLength;
  
  	MultipartFormEntity(final AbstractMultipartForm multipart,
  			final ContentType contentType, final long contentLength) {
  		super();
  		this.multipart = multipart;
  		this.contentType = contentType;
  		this.contentLength = contentLength;
  	}
  
  	AbstractMultipartForm getMultipart() {
  		return this.multipart;
  	}
  
  	public boolean isRepeatable() {
  		return this.contentLength != -1;
  	}
  
  	public boolean isChunked() {
  		return !isRepeatable();
  	}
  
  	public boolean isStreaming() {
  		return !isRepeatable();
  	}
  
  	@Override
  	public long getContentLength() {
  		return this.contentLength;
  	}
  
  	public ContentType getContentType() {
  		return this.contentType;
  	}
  
  	@Override
  	public InputStream getContent() throws IOException {
  		if (this.contentLength < 0) {
  			throw new IllegalArgumentException("Content length is unknown");
  		} else if (this.contentLength > 5 * 1024 * 1024) {
  			throw new IllegalArgumentException("Content length is too long: "
  					+ this.contentLength);
  		}
  		final ByteArrayOutputStream outstream = new ByteArrayOutputStream();
  		writeTo(outstream);
  		outstream.flush();
  		return new ByteArrayInputStream(outstream.toByteArray());
  	}
  
  	@Override
  	public void writeTo(final OutputStream outstream) throws IOException {
  		this.multipart.writeTo(outstream);
  	}
  }