/*
 * ====================================================================
 * 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;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 *
 * @since 4.0
 */
public class InputStreamBody extends AbstractContentBody {

	private final InputStream in;
	private final String filename;
	private int contentLength;

	public InputStreamBody(final InputStream in, final String mimeType,
			final String filename) {
		super(mimeType);
		if (in == null) {
			throw new IllegalArgumentException("Input stream may not be null");
		}
		this.in = in;
		this.filename = filename;
	}

	public InputStreamBody(final InputStream in, final String filename) {
		this(in, "application/octet-stream", filename);
	}

	public InputStream getInputStream() {
		return this.in;
	}

	public void writeTo(final OutputStream out) throws IOException {
		if (out == null) {
			throw new IllegalArgumentException("Output stream may not be null");
		}
		try {
			byte[] tmp = new byte[4096];
			int l;
			while ((l = this.in.read(tmp)) != -1) {
				out.write(tmp, 0, l);
				contentLength += l;
			}
			out.flush();
		} finally {
			this.in.close();
		}
	}

	public String getTransferEncoding() {
		return MIME.ENC_BINARY;
	}

	public String getCharset() {
		return null;
	}

	public long getContentLength() {
		try {
			return Math.max(contentLength, this.in.available());
		} catch (IOException e) {
			return -1;
		}
	}

	public String getFilename() {
		return this.filename;
	}

}
