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/URLDataSource.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]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * 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
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package javax.activation;

import java.net.URL;
import java.net.URLConnection;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;

/**
 * The URLDataSource class provides an object that wraps a <code>URL</code>
 * object in a DataSource interface. URLDataSource simplifies the handling
 * of data described by URLs within the JavaBeans Activation Framework
 * because this class can be used to create new DataHandlers. <i>NOTE: The
 * DataHandler object creates a URLDataSource internally,
 * when it is constructed with a URL.</i>
 *
 * @see javax.activation.DataSource
 * @see javax.activation.DataHandler
 */
public class URLDataSource implements DataSource {
    private URL url = null;
    private URLConnection url_conn = null;

    /**
     * URLDataSource constructor. The URLDataSource class will
     * not open a connection to the URL until a method requiring it
     * to do so is called.
     *
     * @param url The URL to be encapsulated in this object.
     */
    public URLDataSource(URL url) {
	this.url = url;
    }

    /**
     * Returns the value of the URL content-type header field.
     * It calls the URL's <code>URLConnection.getContentType</code> method
     * after retrieving a URLConnection object.
     * <i>Note: this method attempts to call the <code>openConnection</code>
     * method on the URL. If this method fails, or if a content type is not
     * returned from the URLConnection, getContentType returns
     * "application/octet-stream" as the content type.</i>
     *
     * @return the content type.
     */
    public String getContentType() {
	String type = null;

	try {
	    if (url_conn == null)
		url_conn = url.openConnection();
	} catch (IOException e) { }
	
	if (url_conn != null)
	    type = url_conn.getContentType();

	if (type == null)
	    type = "application/octet-stream";
	
	return type;
    }

    /**
     * Calls the <code>getFile</code> method on the URL used to
     * instantiate the object.
     *
     * @return the result of calling the URL's getFile method.
     */
    public String getName() {
	return url.getFile();
    }

    /**
     * The getInputStream method from the URL. Calls the
     * <code>openStream</code> method on the URL.
     *
     * @return the InputStream.
     */
    public InputStream getInputStream() throws IOException {
	return url.openStream();
    }

    /**
     * The getOutputStream method from the URL. First an attempt is
     * made to get the URLConnection object for the URL. If that
     * succeeds, the getOutputStream method on the URLConnection
     * is returned.
     *
     * @return the OutputStream.
     */
    public OutputStream getOutputStream() throws IOException {
	// get the url connection if it is available
	url_conn = url.openConnection();
	
	if (url_conn != null) {
	    url_conn.setDoOutput(true);
	    return url_conn.getOutputStream();
	} else
	    return null;
    }

    /**
     * Return the URL used to create this DataSource.
     *
     * @return The URL.
     */
    public URL getURL() {
	return url;
    }
}

⏎ javax/activation/URLDataSource.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)