ImagePngDataObject.java

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package org.demo.imageservice;

import java.awt.image.BufferedImage;
import java.io.IOException;
import org.demo.fileservice.DocumentWriter;
import org.demo.fileservice.Thumbnail;
import org.openide.filesystems.FileObject;
import org.openide.loaders.DataNode;
import org.openide.loaders.DataObjectExistsException;
import org.openide.loaders.MultiDataObject;
import org.openide.loaders.MultiFileLoader;
import org.openide.nodes.Node;
import org.openide.nodes.Children;
import org.openide.util.Lookup;

public class ImagePngDataObject extends MultiDataObject implements Thumbnail,DocumentWriter {
    public static final String EXTENSION = "png";
    public static final String DESCRIPTION = "Portable Network Graphics";

    public ImagePngDataObject(FileObject pf, MultiFileLoader loader) throws DataObjectExistsException, IOException {
        super(pf, loader);

    }

    @Override
    protected Node createNodeDelegate() {
        return new DataNode(this, Children.LEAF, getLookup());
    }

    @Override
    public Lookup getLookup() {
        return getCookieSet().getLookup();
    }

    @Override
    public BufferedImage getThumbnail() {
        return ImageIOUtils.getImage(getPrimaryFile());
    }

    @Override
    public void write(BufferedImage source) {
        ImageIOUtils.writeImage(getPrimaryFile(), EXTENSION, source);
    }

    @Override
    public String getExtension() {
        return EXTENSION;
    }
}