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/*
 * Copyright (c) 1997, 2022 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.messaging.saaj.soap;

import java.io.*;
import java.awt.*;

import jakarta.activation.*;

/**
 * DataContentHandler for image/gif.
 *
 * @author Ana Lindstrom-Tamer
 */
public class GifDataContentHandler extends Component implements DataContentHandler {

	private static final long serialVersionUID = -8698473820462938913L;

	private static ActivationDataFlavor myDF =
        new ActivationDataFlavor(
            java.awt.Image.class,
            "image/gif",
            "GIF Image");

	public GifDataContentHandler() {}

    protected ActivationDataFlavor getDF() {
        return myDF;
    }

    /**
     * Return the DataFlavors for this DataContentHandler.
     *
     * @return The DataFlavors
     */
    @Override
    public ActivationDataFlavor[] getTransferDataFlavors() { // throws Exception;
        return new ActivationDataFlavor[] { getDF()};
    }

    /**
     * Return the Transfer Data of type DataFlavor from InputStream.
     *
     * @param df The DataFlavor
     * @param ds The DataSource
     * @return String object
     * @exception IOException in case of an I/O error
     */
    @Override
    public Object getTransferData(ActivationDataFlavor 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;
    }

    @Override
    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;
			size += Math.min(size, 256 * 1024);
		byte[] tbuf = new byte[size];
		System.arraycopy(buf, 0, tbuf, 0, pos);
		buf = tbuf;
	    }
	}
	Toolkit tk = Toolkit.getDefaultToolkit();
	return tk.createImage(buf, 0, pos);
    }

    /**
     * Write the object to the output stream, using the specified MIME type.
     * @param obj object to write
     * @param type requested MIME type of the resulting byte stream
     * @param os OutputStream
     */
    @Override
    public void writeTo(Object obj, String type, OutputStream os)
			throws IOException {
	if (obj != null && !(obj instanceof Image))
	    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");
    }
    

}