Apache CXF example source code file (ImageDataContentHandler.java)

This example Apache CXF source code file (ImageDataContentHandler.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Apache CXF tags/keywords

awt, bufferedimage, bufferedimage, dataflavor, dataflavor, datasource, datatransfer, flavors, flavors, image, image, imagedatacontenthandler, imageio, io, ioexception, ioexception, mediatracker, object, string, util

The Apache CXF ImageDataContentHandler.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.cxf.attachment;

import java.awt.Component;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;

import javax.activation.ActivationDataFlavor;
import javax.activation.DataContentHandler;
import javax.activation.DataSource;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;

/**
 * 
 */
public class ImageDataContentHandler implements DataContentHandler {
    private static final DataFlavor[] FLAVORS;
    static {
        String[] types = ImageIO.getReaderMIMETypes();
        FLAVORS = new DataFlavor[types.length];
        int i = 0;
        for (String type : types) {
            FLAVORS[i++] = new ActivationDataFlavor(Image.class, type, "Image");
        }
    }

    public Object getContent(DataSource ds) throws IOException {
        return ImageIO.read(ds.getInputStream());
    }

    public Object getTransferData(DataFlavor df, DataSource ds) throws UnsupportedFlavorException,
        IOException {
        for (DataFlavor f : FLAVORS) {
            if (f.equals(df)) {
                return getContent(ds);
            }
        }
        return null;
    }

    public DataFlavor[] getTransferDataFlavors() {
        return FLAVORS;
    }

    public void writeTo(Object obj, String mimeType, OutputStream os) throws IOException {
        Iterator<ImageWriter> writers = ImageIO.getImageWritersByMIMEType(mimeType);
        if (writers.hasNext()) {
            ImageWriter writer = writers.next();
            
            BufferedImage bimg = convertToBufferedImage((Image)obj);
            ImageOutputStream out = ImageIO.createImageOutputStream(os); 
            writer.setOutput(out);
            writer.write(bimg);
            writer.dispose();
            out.flush();
            out.close();
        } else {
            throw new IOException("Attachment type not spported " + obj.getClass());                    
        }

    }
    private static BufferedImage convertToBufferedImage(Image image) throws IOException {
        if (image instanceof BufferedImage) {
            return (BufferedImage)image;
        }
        
        // Wait until the image is completely loaded
        MediaTracker tracker = new MediaTracker(new Component() { });
        tracker.addImage(image, 0);
        try {
            tracker.waitForAll();
        } catch (InterruptedException e) {
            IOException ioe = new IOException(e.getMessage());
            ioe.initCause(e);
            throw ioe;
        }
        
        // Create a BufferedImage so we can write it out later
        BufferedImage bufImage = new BufferedImage(
                image.getWidth(null),
                image.getHeight(null),
                BufferedImage.TYPE_INT_ARGB);

        Graphics g = bufImage.createGraphics();
        g.drawImage(image, 0, 0, null);
        g.dispose();
        return bufImage;
    }

}