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/FileTypeMap.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.io.File;
import java.util.Map;
import java.util.WeakHashMap;

/**
 * The FileTypeMap is an abstract class that provides a data typing
 * interface for files. Implementations of this class will
 * implement the getContentType methods which will derive a content
 * type from a file name or a File object. FileTypeMaps could use any
 * scheme to determine the data type, from examining the file extension
 * of a file (like the MimetypesFileTypeMap) to opening the file and
 * trying to derive its type from the contents of the file. The
 * FileDataSource class uses the default FileTypeMap (a MimetypesFileTypeMap
 * unless changed) to determine the content type of files.
 *
 * @see javax.activation.FileTypeMap
 * @see javax.activation.FileDataSource
 * @see javax.activation.MimetypesFileTypeMap
 */

public abstract class FileTypeMap {

    private static FileTypeMap defaultMap = null;
    private static Map<ClassLoader,FileTypeMap> map =
				new WeakHashMap<ClassLoader,FileTypeMap>();

    /**
     * The default constructor.
     */
    public FileTypeMap() {
	super();
    }

    /**
     * Return the type of the file object. This method should
     * always return a valid MIME type.
     *
     * @param file A file to be typed.
     * @return The content type.
     */
    abstract public String getContentType(File file);

    /**
     * Return the type of the file passed in.  This method should
     * always return a valid MIME type.
     *
     * @param filename the pathname of the file.
     * @return The content type.
     */
    abstract public String getContentType(String filename);

    /**
     * Sets the default FileTypeMap for the system. This instance
     * will be returned to callers of getDefaultFileTypeMap.
     *
     * @param fileTypeMap The FileTypeMap.
     * @exception SecurityException if the caller doesn't have permission
     *					to change the default
     */
    public static synchronized void setDefaultFileTypeMap(FileTypeMap fileTypeMap) {
	SecurityManager security = System.getSecurityManager();
	if (security != null) {
	    try {
		// if it's ok with the SecurityManager, it's ok with me...
		security.checkSetFactory();
	    } catch (SecurityException ex) {
		// otherwise, we also allow it if this code and the
		// factory come from the same (non-system) class loader (e.g.,
		// the JAF classes were loaded with the applet classes).
		ClassLoader cl = FileTypeMap.class.getClassLoader();
		if (cl == null || cl.getParent() == null ||
		    cl != fileTypeMap.getClass().getClassLoader())
		    throw ex;
	    }
	}
	// remove any per-thread-context-class-loader FileTypeMap
	map.remove(SecuritySupport.getContextClassLoader());
	defaultMap = fileTypeMap;	
    }

    /**
     * Return the default FileTypeMap for the system.
     * If setDefaultFileTypeMap was called, return
     * that instance, otherwise return an instance of
     * <code>MimetypesFileTypeMap</code>.
     *
     * @return The default FileTypeMap
     * @see javax.activation.FileTypeMap#setDefaultFileTypeMap
     */
    public static synchronized FileTypeMap getDefaultFileTypeMap() {
	if (defaultMap != null)
	    return defaultMap;

	// fetch per-thread-context-class-loader default
	ClassLoader tccl = SecuritySupport.getContextClassLoader();
	FileTypeMap def = map.get(tccl);
	if (def == null) {
	    def = new MimetypesFileTypeMap();
	    map.put(tccl, def);
	}
	return def;
    }
}

⏎ javax/activation/FileTypeMap.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)