java.fedora.client.objecteditor.ImageContentViewer Maven / Gradle / Ivy

Go to download
/*
 * -----------------------------------------------------------------------------
 *
 * License and Copyright: The contents of this file are subject to 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.fedora-commons.org/licenses.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 *
 * The entire file consists of original code.
 * Copyright © 2008 Fedora Commons, Inc.

 * 
Copyright © 2002-2007 The Rector and Visitors of the University of 
 * Virginia and Cornell University
 
 * All rights reserved.
 *
 * -----------------------------------------------------------------------------
 */
package fedora.client.objecteditor;

import java.io.InputStream;
import java.io.IOException;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JScrollPane;

import javax.media.jai.JAI;
import com.sun.media.jai.codec.MemoryCacheSeekableStream;

/**
 * Views content of common image formats in a JComponent.
 *
 */
public class ImageContentViewer 
        extends ContentViewer {

    private JLabel m_label;
    private JScrollPane m_pane;
    private boolean s_registered;

    public ImageContentViewer() {
        if (!s_registered) {
            ContentHandlerFactory.register(this);
            s_registered=true;
        }
    }

    /**
     * Get the JComponent.
     */
    public JComponent getComponent() {
        return m_pane;
    }

    /**
     * Returns a list of content types that this component can handle.
     * This will usually be a list of MIME Types, but may also include
     * other notions of type known to be understood by the users of
     * ContentHandlerFactory.
     */
    public String[] getTypes() {
        return new String[] {"image/gif", "image/jpeg", "image/tiff",
                "image/bmp", "image/x-ms-bmp", "image/x-bitmap", "image/png"};
    }

    /**
     * Initializes the handler.  This should only be called once per instance,
     * and is guaranteed to have been called when this component is provided
     * by the ContentHandlerFactory.
     *
     * The viewOnly parameter signals to ContentEditor implementations that
     * editing capabilities are not desired by the caller.
     */
    public void init(String type, InputStream data, boolean viewOnly)
            throws IOException {
        setContent(data);
    }

    /**
     * Re-initializes the handler given new input data.
     * The old data can be discarded.
     */
    public void setContent(InputStream data) 
            throws IOException {
        try {
            ImageIcon image=new ImageIcon(JAI.create("stream", 
                new MemoryCacheSeekableStream(data)).getAsBufferedImage());
            if (m_pane==null) {
                m_label=new JLabel(image);
                m_pane=new JScrollPane(m_label);
            } else {
                m_label.setIcon(image);
            }
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }

}