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Apache HttpComponents HttpClient - MIME coded entities
There is a newer version: 4.5.14
/*
 * ====================================================================
 * 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
 * .
 *
 */

package org.apache.http.entity.mime;

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

import org.apache.http.ContentTooLongException;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.entity.ContentType;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;

@SuppressWarnings("deprecation")
class MultipartFormEntity implements HttpEntity {

    private final AbstractMultipartForm multipart;
    private final Header contentType;
    private final long contentLength;

    MultipartFormEntity(
            final AbstractMultipartForm multipart,
            final ContentType contentType,
            final long contentLength) {
        super();
        this.multipart = multipart;
        this.contentType = new BasicHeader(HTTP.CONTENT_TYPE, contentType.toString());
        this.contentLength = contentLength;
    }

    AbstractMultipartForm getMultipart() {
        return this.multipart;
    }

    @Override
    public boolean isRepeatable() {
        return this.contentLength != -1;
    }

    @Override
    public boolean isChunked() {
        return !isRepeatable();
    }

    @Override
    public boolean isStreaming() {
        return !isRepeatable();
    }

    @Override
    public long getContentLength() {
        return this.contentLength;
    }

    @Override
    public Header getContentType() {
        return this.contentType;
    }

    @Override
    public Header getContentEncoding() {
        return null;
    }

    @Override
    public void consumeContent() {
    }

    @Override
    public InputStream getContent() throws IOException {
        if (this.contentLength < 0) {
            throw new ContentTooLongException("Content length is unknown");
        } else if (this.contentLength > 25 * 1024) {
            throw new ContentTooLongException("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);
    }

}