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Open source Reference Implementation of JSR-67: SOAP with Attachments API for Java (SAAJ MR: 1.4)
There is a newer version: 3.0.4
/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.messaging.saaj.soap;

import java.awt.datatransfer.DataFlavor;
import java.io.*;

import javax.activation.*;
import com.sun.xml.messaging.saaj.packaging.mime.internet.MimeUtility;
import com.sun.xml.messaging.saaj.packaging.mime.internet.ContentType;

/**
 * JAF data content handler for text/plain --> String
 *
 */
public class StringDataContentHandler implements DataContentHandler {
    private static ActivationDataFlavor myDF = new ActivationDataFlavor(
	java.lang.String.class,
	"text/plain",
	"Text String");

    protected ActivationDataFlavor getDF() {
	return myDF;
    }

    /**
     * Return the DataFlavors for this DataContentHandler.
     *
     * @return The DataFlavors
     */
    @Override
    public DataFlavor[] getTransferDataFlavors() {
	return new DataFlavor[] { getDF() };
    }

    /**
     * Return the Transfer Data of type DataFlavor from InputStream.
     *
     * @param df The DataFlavor
     * @param ds The DataSource corresponding to the data
     * @return String object
     */
    @Override
    public Object getTransferData(DataFlavor df, DataSource ds)
			throws IOException {
	// use myDF.equals to be sure to get ActivationDataFlavor.equals,
	// which properly ignores Content-Type parameters in comparison
	if (getDF().equals(df))
	    return getContent(ds);
	else
	    return null;
    }

    @Override
    public Object getContent(DataSource ds) throws IOException {
	String enc = null;
	InputStreamReader is = null;
	
	try {
	    enc = getCharset(ds.getContentType());
	    is = new InputStreamReader(ds.getInputStream(), enc);
	} catch (IllegalArgumentException iex) {
	    /*
	     * An unknown charset of the form ISO-XXX-XXX will cause
	     * the JDK to throw an IllegalArgumentException.  The
	     * JDK will attempt to create a classname using this string,
	     * but valid classnames must not contain the character '-',
	     * and this results in an IllegalArgumentException, rather than
	     * the expected UnsupportedEncodingException.  Yikes.
	     */
	    throw new UnsupportedEncodingException(enc);
	}

	try {
	    int pos = 0;
	    int count;
	    char buf[] = new char[1024];

	    while ((count = is.read(buf, pos, buf.length - pos)) != -1) {
		pos += count;
		if (pos >= buf.length) {
		    int size = buf.length;
		    if (size < 256*1024)
			size += size;
		    else
			size += 256*1024;
		    char tbuf[] = new char[size];
		    System.arraycopy(buf, 0, tbuf, 0, pos);
		    buf = tbuf;
		}
	    }
	    return new String(buf, 0, pos);
	} finally {
	    try {
		is.close();
	    } catch (IOException ex) { }
	}
    }
    
    /**
     * Write the object to the output stream, using the specified MIME type.
     */
    @Override
    public void writeTo(Object obj, String type, OutputStream os)
			throws IOException {
	if (!(obj instanceof String))
	    throw new IOException("\"" + getDF().getMimeType() +
		"\" DataContentHandler requires String object, " +
		"was given object of type " + obj.getClass().toString());

	String enc = null;
	OutputStreamWriter osw = null;

	try {
	    enc = getCharset(type);
	    osw = new OutputStreamWriter(os, enc);
	} catch (IllegalArgumentException iex) {
	    /*
	     * An unknown charset of the form ISO-XXX-XXX will cause
	     * the JDK to throw an IllegalArgumentException.  The
	     * JDK will attempt to create a classname using this string,
	     * but valid classnames must not contain the character '-',
	     * and this results in an IllegalArgumentException, rather than
	     * the expected UnsupportedEncodingException.  Yikes.
	     */
	    throw new UnsupportedEncodingException(enc);
	}

	String s = (String)obj;
	osw.write(s, 0, s.length());
	osw.flush();
    }

    private String getCharset(String type) {
	try {
	    ContentType ct = new ContentType(type);
	    String charset = ct.getParameter("charset");
	    if (charset == null)
		// If the charset parameter is absent, use US-ASCII.
		charset = "us-ascii";
	    return MimeUtility.javaCharset(charset);
	} catch (Exception ex) {
	    return null;
	}
    }

}