k-9/src/com/fsck/k9/mail/Multipart.java

package com.fsck.k9.mail;

import java.util.ArrayList;

import com.fsck.k9.mail.internet.MimeHeader;
import com.fsck.k9.mail.internet.MimeUtility;
import com.fsck.k9.mail.internet.TextBody;

public abstract class Multipart implements Body {
    protected Part mParent;

    protected ArrayList<BodyPart> mParts = new ArrayList<BodyPart>();

    protected String mContentType;

    public void addBodyPart(BodyPart part) {
        mParts.add(part);
        part.setParent(this);
    }

    public void addBodyPart(BodyPart part, int index) {
        mParts.add(index, part);
        part.setParent(this);
    }

    public BodyPart getBodyPart(int index) {
        return mParts.get(index);
    }

    public String getContentType() {
        return mContentType;
    }

    public int getCount() {
        return mParts.size();
    }

    public boolean removeBodyPart(BodyPart part) {
        part.setParent(null);
        return mParts.remove(part);
    }

    public void removeBodyPart(int index) {
        mParts.get(index).setParent(null);
        mParts.remove(index);
    }

    public Part getParent() {
        return mParent;
    }

    public void setParent(Part parent) {
        this.mParent = parent;
    }

    public void setEncoding(String encoding) {
        for (BodyPart part : mParts) {
            try {
                Body body = part.getBody();
                if (body instanceof TextBody) {
                    part.setHeader(MimeHeader.HEADER_CONTENT_TRANSFER_ENCODING, encoding);
                    ((TextBody)body).setEncoding(encoding);
                }
            } catch (MessagingException e) {
                // Ignore
            }
        }

    }

    public void setCharset(String charset) throws MessagingException {
        if (mParts.isEmpty())
            return;

        BodyPart part = mParts.get(0);
        Body body = part.getBody();
        if (body instanceof TextBody) {
            MimeUtility.setCharset(charset, part);
            ((TextBody)body).setCharset(charset);
        }
    }
}