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The Async Http Client (AHC) classes.
There is a newer version: 3.0.0
/*
 * Copyright (c) 2014 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.request.body.multipart;

import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

import org.asynchttpclient.Param;

public abstract class PartBase implements Part {

    /**
     * The name of the form field, part of the Content-Disposition header
     */
    private final String name;

    /**
     * The main part of the Content-Type header
     */
    private final String contentType;

    /**
     * The charset (part of Content-Type header)
     */
    private final Charset charset;

    /**
     * The Content-Transfer-Encoding header value.
     */
    private final String transferEncoding;

    /**
     * The Content-Id
     */
    private final String contentId;

    /**
     * The disposition type (part of Content-Disposition)
     */
    private String dispositionType;

    /**
     * Additional part headers
     */
    private List customHeaders;

    /**
     * Constructor.
     * 
     * @param name The name of the part, or null
     * @param contentType The content type, or null
     * @param charset The character encoding, or null
     * @param contentId The content id, or null
     * @param transferEncoding The transfer encoding, or null
     */
    public PartBase(String name, String contentType, Charset charset, String contentId, String transferEncoding) {
        this.name = name;
        this.contentType = contentType;
        this.charset = charset;
        this.contentId = contentId;
        this.transferEncoding = transferEncoding;
    }

    @Override
    public String getName() {
        return this.name;
    }

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

    @Override
    public Charset getCharset() {
        return this.charset;
    }

    @Override
    public String getTransferEncoding() {
        return transferEncoding;
    }

    @Override
    public String getContentId() {
        return contentId;
    }

    @Override
    public String getDispositionType() {
        return dispositionType;
    }

    @Override
    public List getCustomHeaders() {
        return customHeaders;
    }

    public void setDispositionType(String dispositionType) {
        this.dispositionType = dispositionType;
    }

    public void addCustomHeader(String name, String value) {
        if (customHeaders == null) {
            customHeaders = new ArrayList(2);
        }
        customHeaders.add(new Param(name, value));
    }

    public void setCustomHeaders(List customHeaders) {
        this.customHeaders = customHeaders;
    }

    public String toString() {
        return new StringBuilder()//
                .append(getClass().getSimpleName())//
                .append(" name=").append(getName())//
                .append(" contentType=").append(getContentType())//
                .append(" charset=").append(getCharset())//
                .append(" tranferEncoding=").append(getTransferEncoding())//
                .append(" contentId=").append(getContentId())//
                .append(" dispositionType=").append(getDispositionType())//
                .toString();
    }
}