JAF 1.2.0 Java Source Code Files are important if you want to compile them with different JDK releases.

You can get JAF 1.2.0 Java Source Code Files from JAF GitHub Website in the "activation/src/main/java/" folder.

You can also browse JAF 1.2.0 Client Source Code files below:

⏎ javax/activation/DataContentHandler.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
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 * If you wish your version of this file to be governed by only the CDDL or
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
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 */

package javax.activation;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.activation.DataSource;

/**
 * The DataContentHandler interface is implemented by objects that can
 * be used to extend the capabilities of the DataHandler's implementation
 * of the Transferable interface. Through <code>DataContentHandlers</code>
 * the framework can be extended to convert streams in to objects, and
 * to write objects to streams. <p>
 *
 * Applications don't generally call the methods in DataContentHandlers
 * directly. Instead, an application calls the equivalent methods in
 * DataHandler. The DataHandler will attempt to find an appropriate
 * DataContentHandler that corresponds to its MIME type using the
 * current DataContentHandlerFactory. The DataHandler then calls
 * through to the methods in the DataContentHandler.
 */

public interface DataContentHandler {
    /**
     * Returns an array of DataFlavor objects indicating the flavors the
     * data can be provided in. The array should be ordered according to
     * preference for providing the data (from most richly descriptive to
     * least descriptive).
     *
     * @return The DataFlavors.
     */
    public DataFlavor[] getTransferDataFlavors();

    /**
     * Returns an object which represents the data to be transferred.
     * The class of the object returned is defined by the representation class
     * of the flavor.
     *
     * @param df The DataFlavor representing the requested type.
     * @param ds The DataSource representing the data to be converted.
     * @return The constructed Object.
     * @exception UnsupportedFlavorException	if the handler doesn't
     *						support the requested flavor
     * @exception IOException	if the data can't be accessed
     */
    public Object getTransferData(DataFlavor df, DataSource ds)
				throws UnsupportedFlavorException, IOException;

    /**
     * Return an object representing the data in its most preferred form.
     * Generally this will be the form described by the first DataFlavor
     * returned by the <code>getTransferDataFlavors</code> method.
     *
     * @param ds The DataSource representing the data to be converted.
     * @return The constructed Object.
     * @exception IOException	if the data can't be accessed
     */
    public Object getContent(DataSource ds) throws IOException;

    /**
     * Convert the object to a byte stream of the specified MIME type
     * and write it to the output stream.
     *
     * @param obj	The object to be converted.
     * @param mimeType	The requested MIME type of the resulting byte stream.
     * @param os	The output stream into which to write the converted
     *			byte stream.
     * @exception IOException	errors writing to the stream
     */
    public void writeTo(Object obj, String mimeType, OutputStream os)
	                                               throws IOException;
}

⏎ javax/activation/DataContentHandler.java

Or download all of them as a single archive file:

File name: javax.activation-1.2.0-fyi.zip
File size: 78269 bytes
Release date: 2018-09-07
Download 

⇒ Older Releases of JAF (JavaBeans Activation Framework)

⇐ JAF 1.2.0 JAR File - javax.activation-1.2.0.jar

⇑ Downloading activation.jar - JavaBeans Activation Framework

⇑⇑ activation.jar - JAF (JavaBeans Activation Framework)