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/DataHandler.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.
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 * GPL Classpath Exception:
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package javax.activation;

import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;

/**
 * The DataHandler class provides a consistent interface to data
 * available in many different sources and formats.
 * It manages simple stream to string conversions and related operations
 * using DataContentHandlers.
 * It provides access to commands that can operate on the data.
 * The commands are found using a CommandMap. <p>
 *
 * <b>DataHandler and the Transferable Interface</b><p>
 * DataHandler implements the Transferable interface so that data can
 * be used in AWT data transfer operations, such as cut and paste and
 * drag and drop. The implementation of the Transferable interface
 * relies on the availability of an installed DataContentHandler
 * object corresponding to the MIME type of the data represented in
 * the specific instance of the DataHandler.<p>
 *
 * <b>DataHandler and CommandMaps</b><p>
 * The DataHandler keeps track of the current CommandMap that it uses to
 * service requests for commands (<code>getCommand</code>,
 * <code>getAllCommands</code>, <code>getPreferredCommands</code>).
 * Each instance of a DataHandler may have a CommandMap associated with
 * it using the <code>setCommandMap</code> method.  If a CommandMap was
 * not set, DataHandler calls the <code>getDefaultCommandMap</code>
 * method in CommandMap and uses the value it returns. See
 * <i>CommandMap</i> for more information. <p>
 *
 * <b>DataHandler and URLs</b><p>
 * The current DataHandler implementation creates a private
 * instance of URLDataSource when it is constructed with a URL.
 *
 * @see javax.activation.CommandMap
 * @see javax.activation.DataContentHandler
 * @see javax.activation.DataSource
 * @see javax.activation.URLDataSource
 */

public class DataHandler implements Transferable {

    // Use the datasource to indicate whether we were started via the
    // DataSource constructor or the object constructor.
    private DataSource dataSource = null;
    private DataSource objDataSource = null;

    // The Object and mimetype from the constructor (if passed in).
    // object remains null if it was instantiated with a
    // DataSource.
    private Object object = null;
    private String objectMimeType = null;

    // Keep track of the CommandMap
    private CommandMap currentCommandMap = null;

    // our transfer flavors
    private static final DataFlavor emptyFlavors[] = new DataFlavor[0];
    private DataFlavor transferFlavors[] = emptyFlavors;

    // our DataContentHandler
    private DataContentHandler dataContentHandler = null;
    private DataContentHandler factoryDCH = null;

    // our DataContentHandlerFactory
    private static DataContentHandlerFactory factory = null;
    private DataContentHandlerFactory oldFactory = null;
    // the short representation of the ContentType (sans params)
    private String shortType = null;

    /**
     * Create a <code>DataHandler</code> instance referencing the
     * specified DataSource.  The data exists in a byte stream form.
     * The DataSource will provide an InputStream to access the data.
     *
     * @param ds	the DataSource
     */
    public DataHandler(DataSource ds) {
	// save a reference to the incoming DS
	dataSource = ds;
	oldFactory = factory; // keep track of the factory
    }

    /**
     * Create a <code>DataHandler</code> instance representing an object
     * of this MIME type.  This constructor is
     * used when the application already has an in-memory representation
     * of the data in the form of a Java Object.
     *
     * @param obj	the Java Object
     * @param mimeType	the MIME type of the object
     */
    public DataHandler(Object obj, String mimeType) {
	object = obj;
	objectMimeType = mimeType;
	oldFactory = factory; // keep track of the factory
    }

    /**
     * Create a <code>DataHandler</code> instance referencing a URL.
     * The DataHandler internally creates a <code>URLDataSource</code>
     * instance to represent the URL.
     *
     * @param url	a URL object
     */
    public DataHandler(URL url) {
	dataSource = new URLDataSource(url);
	oldFactory = factory; // keep track of the factory
    }

    /**
     * Return the CommandMap for this instance of DataHandler.
     */
    private synchronized CommandMap getCommandMap() {
	if (currentCommandMap != null)
	    return currentCommandMap;
	else
	    return CommandMap.getDefaultCommandMap();
    }

    /**
     * Return the DataSource associated with this instance
     * of DataHandler.
     * <p>
     * For DataHandlers that have been instantiated with a DataSource,
     * this method returns the DataSource that was used to create the
     * DataHandler object. In other cases the DataHandler
     * constructs a DataSource from the data used to construct
     * the DataHandler. DataSources created for DataHandlers <b>not</b>
     * instantiated with a DataSource are cached for performance
     * reasons.
     *
     * @return	a valid DataSource object for this DataHandler
     */
    public DataSource getDataSource() {
	if (dataSource == null) {
	    // create one on the fly
	    if (objDataSource == null)
		objDataSource = new DataHandlerDataSource(this);
	    return objDataSource;
	}
	return dataSource;
    }

    /**
     * Return the name of the data object. If this DataHandler
     * was created with a DataSource, this method calls through
     * to the <code>DataSource.getName</code> method, otherwise it
     * returns <i>null</i>.
     *
     * @return	the name of the object
     */
    public String getName() {
	if (dataSource != null)
	    return dataSource.getName();
	else
	    return null;
    }

    /**
     * Return the MIME type of this object as retrieved from
     * the source object. Note that this is the <i>full</i>
     * type with parameters.
     *
     * @return	the MIME type
     */
    public String getContentType() {
	if (dataSource != null) // data source case
	    return dataSource.getContentType();
	else
	    return objectMimeType; // obj/type case
    }

    /**
     * Get the InputStream for this object. <p>
     *
     * For DataHandlers instantiated with a DataSource, the DataHandler
     * calls the <code>DataSource.getInputStream</code> method and
     * returns the result to the caller.
     * <p>
     * For DataHandlers instantiated with an Object, the DataHandler
     * first attempts to find a DataContentHandler for the Object. If
     * the DataHandler can not find a DataContentHandler for this MIME
     * type, it throws an UnsupportedDataTypeException.  If it is
     * successful, it creates a pipe and a thread.  The thread uses the
     * DataContentHandler's <code>writeTo</code> method to write the
     * stream data into one end of the pipe.  The other end of the pipe
     * is returned to the caller.  Because a thread is created to copy
     * the data, IOExceptions that may occur during the copy can not be
     * propagated back to the caller. The result is an empty stream.<p>
     *
     * @return	the InputStream representing this data
     * @exception IOException	if an I/O error occurs
     *
     * @see javax.activation.DataContentHandler#writeTo
     * @see javax.activation.UnsupportedDataTypeException
     */
    public InputStream getInputStream() throws IOException {
	InputStream ins = null;

	if (dataSource != null) {
	    ins = dataSource.getInputStream();
	} else {
	    DataContentHandler dch = getDataContentHandler();
	    // we won't even try if we can't get a dch
	    if (dch == null)
		throw new UnsupportedDataTypeException(
				"no DCH for MIME type " + getBaseType());

	    if (dch instanceof ObjectDataContentHandler) {
		if (((ObjectDataContentHandler)dch).getDCH() == null)
		    throw new UnsupportedDataTypeException(
				"no object DCH for MIME type " + getBaseType());
	    }
	    // there is none but the default^^^^^^^^^^^^^^^^
	    final DataContentHandler fdch = dch;

	    // from bill s.
	    // ce n'est pas une pipe!
	    //
	    // NOTE: This block of code needs to throw exceptions, but
	    // can't because it is in another thread!!! ARG!
	    //
	    final PipedOutputStream pos = new PipedOutputStream();
	    PipedInputStream pin = new PipedInputStream(pos);
	    new Thread(
		       new Runnable() {
		public void run() {
		    try {
			fdch.writeTo(object, objectMimeType, pos);
		    } catch (IOException e) {

		    } finally {
			try {
			    pos.close();
			} catch (IOException ie) { }
		    }
		}
	    },
		      "DataHandler.getInputStream").start();
	    ins = pin;
	}

	return ins;
    }

    /**
     * Write the data to an <code>OutputStream</code>.<p>
     *
     * If the DataHandler was created with a DataSource, writeTo
     * retrieves the InputStream and copies the bytes from the
     * InputStream to the OutputStream passed in.
     * <p>
     * If the DataHandler was created with an object, writeTo
     * retrieves the DataContentHandler for the object's type.
     * If the DataContentHandler was found, it calls the
     * <code>writeTo</code> method on the <code>DataContentHandler</code>.
     *
     * @param os	the OutputStream to write to
     * @exception IOException	if an I/O error occurs
     */
    public void writeTo(OutputStream os) throws IOException {
	// for the DataSource case
	if (dataSource != null) {
	    InputStream is = null;
	    byte data[] = new byte[8*1024];
	    int bytes_read;

	    is = dataSource.getInputStream();

	    try {
		while ((bytes_read = is.read(data)) > 0) {
		    os.write(data, 0, bytes_read);
		}
	    } finally {
		is.close();
		is = null;
	    }
	} else { // for the Object case
	    DataContentHandler dch = getDataContentHandler();
	    dch.writeTo(object, objectMimeType, os);
	}
    }

    /**
     * Get an OutputStream for this DataHandler to allow overwriting
     * the underlying data.
     * If the DataHandler was created with a DataSource, the
     * DataSource's <code>getOutputStream</code> method is called.
     * Otherwise, <code>null</code> is returned.
     *
     * @return the OutputStream
     * @exception	IOException	for failures creating the OutputStream
     *
     * @see javax.activation.DataSource#getOutputStream
     * @see javax.activation.URLDataSource
     */
    public OutputStream getOutputStream() throws IOException {
	if (dataSource != null)
	    return dataSource.getOutputStream();
	else
	    return null;
    }

    /**
     * Return the DataFlavors in which this data is available. <p>
     *
     * Returns an array of DataFlavor objects indicating the flavors
     * the data can be provided in. The array is usually ordered
     * according to preference for providing the data, from most
     * richly descriptive to least richly descriptive.<p>
     *
     * The DataHandler attempts to find a DataContentHandler that
     * corresponds to the MIME type of the data. If one is located,
     * the DataHandler calls the DataContentHandler's
     * <code>getTransferDataFlavors</code> method. <p>
     *
     * If a DataContentHandler can <i>not</i> be located, and if the
     * DataHandler was created with a DataSource (or URL), one
     * DataFlavor is returned that represents this object's MIME type
     * and the <code>java.io.InputStream</code> class.  If the
     * DataHandler was created with an object and a MIME type,
     * getTransferDataFlavors returns one DataFlavor that represents
     * this object's MIME type and the object's class.
     *
     * @return	an array of data flavors in which this data can be transferred
     * @see javax.activation.DataContentHandler#getTransferDataFlavors
     */
    public synchronized DataFlavor[] getTransferDataFlavors() {
	if (factory != oldFactory) // if the factory has changed, clear cache
	    transferFlavors = emptyFlavors;

	// if it's not set, set it...
	if (transferFlavors == emptyFlavors)
	    transferFlavors = getDataContentHandler().getTransferDataFlavors();
	if (transferFlavors == emptyFlavors)
	    return transferFlavors;	// no need to clone an empty array
	else
	    return transferFlavors.clone();
    }

    /**
     * Returns whether the specified data flavor is supported
     * for this object.<p>
     *
     * This method iterates through the DataFlavors returned from
     * <code>getTransferDataFlavors</code>, comparing each with
     * the specified flavor.
     *
     * @param flavor	the requested flavor for the data
     * @return		true if the data flavor is supported
     * @see javax.activation.DataHandler#getTransferDataFlavors
     */
    public boolean isDataFlavorSupported(DataFlavor flavor) {
	DataFlavor[] lFlavors = getTransferDataFlavors();

	for (int i = 0; i < lFlavors.length; i++) {
	    if (lFlavors[i].equals(flavor))
		return true;
	}
	return false;
    }

    /**
     * Returns an object that represents the data to be
     * transferred. The class of the object returned is defined by the
     * representation class of the data flavor.<p>
     *
     * <b>For DataHandler's created with DataSources or URLs:</b><p>
     *
     * The DataHandler attempts to locate a DataContentHandler
     * for this MIME type. If one is found, the passed in DataFlavor
     * and the type of the data are passed to its <code>getTransferData</code>
     * method. If the DataHandler fails to locate a DataContentHandler
     * and the flavor specifies this object's MIME type and the
     * <code>java.io.InputStream</code> class, this object's InputStream
     * is returned.
     * Otherwise it throws an UnsupportedFlavorException. <p>
     *
     * <b>For DataHandler's created with Objects:</b><p>
     *
     * The DataHandler attempts to locate a DataContentHandler
     * for this MIME type. If one is found, the passed in DataFlavor
     * and the type of the data are passed to its getTransferData
     * method. If the DataHandler fails to locate a DataContentHandler
     * and the flavor specifies this object's MIME type and its class,
     * this DataHandler's referenced object is returned.  
     * Otherwise it throws an UnsupportedFlavorException.
     *
     * @param flavor	the requested flavor for the data
     * @return		the object
     * @exception UnsupportedFlavorException	if the data could not be
     *			converted to the requested flavor
     * @exception IOException	if an I/O error occurs
     * @see javax.activation.ActivationDataFlavor
     */
    public Object getTransferData(DataFlavor flavor)
				throws UnsupportedFlavorException, IOException {
	return getDataContentHandler().getTransferData(flavor, dataSource);
    }

    /**
     * Set the CommandMap for use by this DataHandler.
     * Setting it to <code>null</code> causes the CommandMap to revert
     * to the CommandMap returned by the
     * <code>CommandMap.getDefaultCommandMap</code> method.
     * Changing the CommandMap, or setting it to <code>null</code>,
     * clears out any data cached from the previous CommandMap.
     *
     * @param commandMap	the CommandMap to use in this DataHandler
     *
     * @see javax.activation.CommandMap#setDefaultCommandMap
     */
    public synchronized void setCommandMap(CommandMap commandMap) {
	if (commandMap != currentCommandMap || commandMap == null) {
	    // clear cached values...
	    transferFlavors = emptyFlavors;
	    dataContentHandler = null;

	    currentCommandMap = commandMap;
	}
    }

    /**
     * Return the <i>preferred</i> commands for this type of data.
     * This method calls the <code>getPreferredCommands</code> method
     * in the CommandMap associated with this instance of DataHandler.
     * This method returns an array that represents a subset of
     * available commands. In cases where multiple commands for the
     * MIME type represented by this DataHandler are present, the
     * installed CommandMap chooses the appropriate commands.
     *
     * @return	the CommandInfo objects representing the preferred commands
     *
     * @see javax.activation.CommandMap#getPreferredCommands
     */
    public CommandInfo[] getPreferredCommands() {
	if (dataSource != null)
	    return getCommandMap().getPreferredCommands(getBaseType(),
							dataSource);
	else
	    return getCommandMap().getPreferredCommands(getBaseType());
    }

    /**
     * Return all the commands for this type of data.
     * This method returns an array containing all commands
     * for the type of data represented by this DataHandler. The
     * MIME type for the underlying data represented by this DataHandler
     * is used to call through to the <code>getAllCommands</code> method
     * of the CommandMap associated with this DataHandler.
     *
     * @return	the CommandInfo objects representing all the commands
     *
     * @see javax.activation.CommandMap#getAllCommands
     */
    public CommandInfo[] getAllCommands() {
	if (dataSource != null)
	    return getCommandMap().getAllCommands(getBaseType(), dataSource);
	else
	    return getCommandMap().getAllCommands(getBaseType());
    }

    /**
     * Get the command <i>cmdName</i>. Use the search semantics as
     * defined by the CommandMap installed in this DataHandler. The
     * MIME type for the underlying data represented by this DataHandler
     * is used to call through to the <code>getCommand</code> method
     * of the CommandMap associated with this DataHandler.
     *
     * @param cmdName	the command name
     * @return	the CommandInfo corresponding to the command
     *
     * @see javax.activation.CommandMap#getCommand
     */
    public CommandInfo getCommand(String cmdName) {
	if (dataSource != null)
	    return getCommandMap().getCommand(getBaseType(), cmdName,
								dataSource);
	else
	    return getCommandMap().getCommand(getBaseType(), cmdName);
    }

    /**
     * Return the data in its preferred Object form. <p>
     *
     * If the DataHandler was instantiated with an object, return
     * the object. <p>
     *
     * If the DataHandler was instantiated with a DataSource,
     * this method uses a DataContentHandler to return the content
     * object for the data represented by this DataHandler. If no
     * <code>DataContentHandler</code> can be found for the
     * the type of this data, the DataHandler returns an
     * InputStream for the data.
     *
     * @return the content.
     * @exception IOException if an IOException occurs during
     *                              this operation.
     */
    public Object getContent() throws IOException {
	if (object != null)
	    return object;
	else
	    return getDataContentHandler().getContent(getDataSource());
    }

    /**
     * A convenience method that takes a CommandInfo object
     * and instantiates the corresponding command, usually
     * a JavaBean component.
     * <p>
     * This method calls the CommandInfo's <code>getCommandObject</code>
     * method with the <code>ClassLoader</code> used to load
     * the <code>javax.activation.DataHandler</code> class itself.
     *
     * @param cmdinfo	the CommandInfo corresponding to a command
     * @return	the instantiated command object
     */
    public Object getBean(CommandInfo cmdinfo) {
	Object bean = null;

	try {
	    // make the bean
	    ClassLoader cld = null;
	    // First try the "application's" class loader.
	    cld = SecuritySupport.getContextClassLoader();
	    if (cld == null)
		cld = this.getClass().getClassLoader();
	    bean = cmdinfo.getCommandObject(this, cld);
	} catch (IOException e) {
	} catch (ClassNotFoundException e) { }

	return bean;
    }

    /**
     * Get the DataContentHandler for this DataHandler: <p>
     *
     * If a DataContentHandlerFactory is set, use it.
     * Otherwise look for an object to serve DCH in the
     * following order: <p>
     *
     * 1) if a factory is set, use it <p>
     * 2) if a CommandMap is set, use it <p>
     * 3) use the default CommandMap <p>
     *
     * In any case, wrap the real DataContentHandler with one of our own
     * to handle any missing cases, fill in defaults, and to ensure that
     * we always have a non-null DataContentHandler.
     *
     * @return	the requested DataContentHandler
     */
    private synchronized DataContentHandler getDataContentHandler() {

	// make sure the factory didn't change
	if (factory != oldFactory) {
	    oldFactory = factory;
	    factoryDCH = null;
	    dataContentHandler = null;
	    transferFlavors = emptyFlavors;
	}

 	if (dataContentHandler != null)
 	    return dataContentHandler;

	String simpleMT = getBaseType();

	if (factoryDCH == null && factory != null)
	    factoryDCH = factory.createDataContentHandler(simpleMT);

 	if (factoryDCH != null)
 	    dataContentHandler = factoryDCH;

	if (dataContentHandler == null) {
	    if (dataSource != null)
		dataContentHandler = getCommandMap().
				createDataContentHandler(simpleMT, dataSource);
	    else
		dataContentHandler = getCommandMap().
				createDataContentHandler(simpleMT);
	}

	// getDataContentHandler always uses these 'wrapper' handlers
	// to make sure it returns SOMETHING meaningful...
	if (dataSource != null)
	    dataContentHandler = new DataSourceDataContentHandler(
						      dataContentHandler,
						      dataSource);
	else
	    dataContentHandler = new ObjectDataContentHandler(
						      dataContentHandler,
						      object,
						      objectMimeType);
	return dataContentHandler;
    }

    /**
     * Use the MimeType class to extract the MIME type/subtype,
     * ignoring the parameters.  The type is cached.
     */
    private synchronized String getBaseType() {
	if (shortType == null) {
	    String ct = getContentType();
	    try {
		MimeType mt = new MimeType(ct);
		shortType = mt.getBaseType();
	    } catch (MimeTypeParseException e) {
		shortType = ct;
	    }
	}
	return shortType;
    }

    /**
     * Sets the DataContentHandlerFactory.  The DataContentHandlerFactory
     * is called first to find DataContentHandlers.
     * The DataContentHandlerFactory can only be set once.
     * <p>
     * If the DataContentHandlerFactory has already been set,
     * this method throws an Error.
     *
     * @param newFactory	the DataContentHandlerFactory
     * @exception Error	if the factory has already been defined.
     *
     * @see javax.activation.DataContentHandlerFactory
     */
    public static synchronized void setDataContentHandlerFactory(
					 DataContentHandlerFactory newFactory) {
	if (factory != null)
	    throw new Error("DataContentHandlerFactory already defined");

	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 class loader (e.g.,
		// the JAF classes were loaded with the applet classes).
		if (DataHandler.class.getClassLoader() !=
			newFactory.getClass().getClassLoader())
		    throw ex;
	    }
	}
	factory = newFactory;
    }
}

/**
 * The DataHanderDataSource class implements the
 * DataSource interface when the DataHandler is constructed
 * with an Object and a mimeType string.
 */
class DataHandlerDataSource implements DataSource {
    DataHandler dataHandler = null;

    /**
     * The constructor.
     */
    public DataHandlerDataSource(DataHandler dh) {
	this.dataHandler = dh;
    }

    /**
     * Returns an <code>InputStream</code> representing this object.
     * @return	the <code>InputStream</code>
     */
    public InputStream getInputStream() throws IOException {
	return dataHandler.getInputStream();
    }

    /**
     * Returns the <code>OutputStream</code> for this object.
     * @return	the <code>OutputStream</code>
     */
    public OutputStream getOutputStream() throws IOException {
	return dataHandler.getOutputStream();
    }

    /**
     * Returns the MIME type of the data represented by this object.
     * @return	the MIME type
     */
    public String getContentType() {
	return dataHandler.getContentType();
    }

    /**
     * Returns the name of this object.
     * @return	the name of this object
     */
    public String getName() {
	return dataHandler.getName(); // what else would it be?
    }
}

/*
 * DataSourceDataContentHandler
 *
 * This is a <i>private</i> DataContentHandler that wraps the real
 * DataContentHandler in the case where the DataHandler was instantiated
 * with a DataSource.
 */
class DataSourceDataContentHandler implements DataContentHandler {
    private DataSource ds = null;
    private DataFlavor transferFlavors[] = null;
    private DataContentHandler dch = null;

    /**
     * The constructor.
     */
    public DataSourceDataContentHandler(DataContentHandler dch, DataSource ds) {
	this.ds = ds;
	this.dch = dch;
    }

    /**
     * Return the DataFlavors for this <code>DataContentHandler</code>.
     * @return	the DataFlavors
     */
    public DataFlavor[] getTransferDataFlavors() {

	if (transferFlavors == null) {
	    if (dch != null) { // is there a dch?
		transferFlavors = dch.getTransferDataFlavors();
	    } else {
		transferFlavors = new DataFlavor[1];
		transferFlavors[0] =
		    new ActivationDataFlavor(ds.getContentType(),
					     ds.getContentType());
	    }
	}
	return transferFlavors;
    }

    /**
     * Return the Transfer Data of type DataFlavor from InputStream.
     * @param df	the DataFlavor
     * @param ds	the DataSource
     * @return		the constructed Object
     */
    public Object getTransferData(DataFlavor df, DataSource ds) throws
				UnsupportedFlavorException, IOException {

	if (dch != null)
	    return dch.getTransferData(df, ds);
	else if (df.equals(getTransferDataFlavors()[0])) // only have one now
	    return ds.getInputStream();
	else
	    throw new UnsupportedFlavorException(df);
    }

    public Object getContent(DataSource ds) throws IOException {

	if (dch != null)
	    return dch.getContent(ds);
	else
	    return ds.getInputStream();
    }

    /**
     * Write the object to the output stream.
     */
    public void writeTo(Object obj, String mimeType, OutputStream os)
						throws IOException {
	if (dch != null)
	    dch.writeTo(obj, mimeType, os);
	else
	    throw new UnsupportedDataTypeException(
			"no DCH for content type " + ds.getContentType());
    }
}

/*
 * ObjectDataContentHandler
 *
 * This is a <i>private</i> DataContentHandler that wraps the real
 * DataContentHandler in the case where the DataHandler was instantiated
 * with an object.
 */
class ObjectDataContentHandler implements DataContentHandler {
    private DataFlavor transferFlavors[] = null;
    private Object obj;
    private String mimeType;
    private DataContentHandler dch = null;

    /**
     * The constructor.
     */
    public ObjectDataContentHandler(DataContentHandler dch,
				    Object obj, String mimeType) {
	this.obj = obj;
	this.mimeType = mimeType;
	this.dch = dch;
    }

    /**
     * Return the DataContentHandler for this object.
     * Used only by the DataHandler class.
     */
    public DataContentHandler getDCH() {
	return dch;
    }

    /**
     * Return the DataFlavors for this <code>DataContentHandler</code>.
     * @return	the DataFlavors
     */
    public synchronized DataFlavor[] getTransferDataFlavors() {
	if (transferFlavors == null) {
	    if (dch != null) {
		transferFlavors = dch.getTransferDataFlavors();
	    } else {
		transferFlavors = new DataFlavor[1];
		transferFlavors[0] = new ActivationDataFlavor(obj.getClass(),
					     mimeType, mimeType);
	    }
	}
	return transferFlavors;
    }

    /**
     * Return the Transfer Data of type DataFlavor from InputStream.
     * @param df	the DataFlavor
     * @param ds	the DataSource
     * @return		the constructed Object
     */
    public Object getTransferData(DataFlavor df, DataSource ds)
				throws UnsupportedFlavorException, IOException {

	if (dch != null)
	    return dch.getTransferData(df, ds);
	else if (df.equals(getTransferDataFlavors()[0])) // only have one now
	    return obj;
	else
	    throw new UnsupportedFlavorException(df);

    }

    public Object getContent(DataSource ds) {
	return obj;
    }

    /**
     * Write the object to the output stream.
     */
    public void writeTo(Object obj, String mimeType, OutputStream os)
						throws IOException {
	if (dch != null)
	    dch.writeTo(obj, mimeType, os);
	else if (obj instanceof byte[])
	    os.write((byte[])obj);
	else if (obj instanceof String) {
	    OutputStreamWriter osw = new OutputStreamWriter(os);
	    osw.write((String)obj);
	    osw.flush();
	} else
	    throw new UnsupportedDataTypeException(
				"no object DCH for MIME type " + this.mimeType);
    }
}

⏎ javax/activation/DataHandler.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)