image_gif.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2011 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://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/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 packager/legal/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 com.sun.mail.handlers;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.activation.ActivationDataFlavor;
import javax.activation.DataContentHandler;
import javax.activation.DataSource;

import myjava.awt.datatransfer.DataFlavor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

/**
 * DataContentHandler for image/gif.
 */
public class image_gif implements DataContentHandler {
	private static ActivationDataFlavor myDF = new ActivationDataFlavor(
			Bitmap.class, "image/gif", "GIF Image");

	protected ActivationDataFlavor getDF() {
		return myDF;
	}

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

	public Object getContent(DataSource ds) throws IOException {
		InputStream is = ds.getInputStream();
		int pos = 0;
		int count;
		byte buf[] = new byte[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;
				byte tbuf[] = new byte[size];
				System.arraycopy(buf, 0, tbuf, 0, pos);
				buf = tbuf;
			}
		}
		return BitmapFactory.decodeByteArray(buf, 0, pos);
	}

	/**
	 * Write the object to the output stream, using the specified MIME type.
	 */
	public void writeTo(Object obj, String type, OutputStream os)
			throws IOException {
		if (!(obj instanceof Bitmap))
			throw new IOException("\"" + getDF().getMimeType()
					+ "\" DataContentHandler requires Image object, "
					+ "was given object of type " + obj.getClass().toString());

		throw new IOException(getDF().getMimeType() + " encoding not supported");
	}
}