Package net.sf.jpluck.apps.jpluckx.ui

Source Code of net.sf.jpluck.apps.jpluckx.ui.PreviewLabel

package net.sf.jpluck.apps.jpluckx.ui;

import net.sf.jpluck.ClientConfiguration;
import net.sf.jpluck.apps.jpluckx.JPluckX;
import net.sf.jpluck.http.HttpClient;
import net.sf.jpluck.http.HttpResponse;

import org.apache.commons.threadpool.DefaultThreadPool;
import org.apache.commons.threadpool.ThreadPool;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferedImage;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import java.net.URI;
import java.net.URL;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import javax.imageio.ImageIO;

import javax.swing.JLabel;
import javax.swing.border.LineBorder;


class PreviewLabel extends JLabel {
    public static final String LOCAL_ROOT = "http://127.0.0.1/showcase/images";
    private static final String LOCAL_CLASSPATH = "showcase/images";
    public static final String WEB_ROOT = "http://jpluck.sourceforge.net/showcase/images";
    private Set notFoundSet = new HashSet();
    private String rootPath;
    private BufferedImage image;
    private ThreadPool threadPool = new DefaultThreadPool(1);
    private String name;
    private File dir;
    private BufferedImage noPreviewImage;
    private BufferedImage downloadingImage;
    private Map imageMap = new HashMap();

    public PreviewLabel(String rootPath) {
        this.rootPath = rootPath;
        setBorder(new LineBorder(Color.BLACK, 1));
        setPreferredSize(new Dimension(160, 160));
        if (!JPluckX.getInstance().isWebStart()) {
            URL url = PreviewLabel.class.getClassLoader().getResource(LOCAL_CLASSPATH);
            URI uri = URI.create(url.toString());
            dir = new File(uri);
        }
        try {
            noPreviewImage = ImageIO.read(PreviewLabel.class.getClassLoader().getResource("net/sf/jpluck/res/showcase/nopreview.gif"));
            downloadingImage = ImageIO.read(PreviewLabel.class.getClassLoader().getResource("net/sf/jpluck/res/showcase/downloadingpreview.gif"));
        } catch (IOException e) {
        }
    }

    public synchronized void showPreview(String name) {
        if (name != null) {
            this.name = name;
        } else {
            name = this.name;
        }
        byte[] data = (byte[]) imageMap.get(name);
        if (data == null) {
            File imageFile = new File(dir, convertToFilename(name));
            if (imageFile.exists()) {
                try {
                    data = new byte[(int) imageFile.length()];
                    FileInputStream in = new FileInputStream(imageFile);
                    in.read(data);
                    in.close();
                } catch (IOException e) {
                    data = null;
                }
            } else if (notFoundSet.contains(name)) {
                image = noPreviewImage;
                repaint();
                return;
            }
        }
        if (data != null) {
            try {
                image = ImageIO.read(new ByteArrayInputStream(data));
                repaint();
            } catch (IOException e) {
            }
        } else {
            if (ClientConfiguration.getDefault().isShowcasePreview()) {
                image = downloadingImage;
                repaint();
                threadPool.invokeLater(new RetrieveTask(name));
            } else {
                image = noPreviewImage;
                repaint();
            }
        }
    }

    private String convertToFilename(String name) {
        name = name.toLowerCase();
        name = name.replace(' ', '_');
        name = name.replaceAll("[\\?:!&']", "");
        return name + ".gif";
    }

    protected void paintComponent(Graphics g) {
        if (image != null) {
            g.drawImage(image, 0, 0, this);
        } else {
            g.clearRect(0, 0, 160, 160);
        }
    }

    private class RetrieveTask implements Runnable {
        private String name;

        public RetrieveTask(String name) {
            this.name = name;
        }

        public void run() {
            try {
                HttpClient client = new HttpClient();
                String filename = convertToFilename(name);
                HttpResponse response = client.doGet(rootPath + "/" + filename);
                if (response.getStatusCode() == 200) {
                    byte[] data = response.getContent();
                    if (!JPluckX.getInstance().isWebStart()) {
                        FileOutputStream out = new FileOutputStream(new File(dir, filename));
                        out.write(data);
                        out.close();
                    }
                    imageMap.put(name, data);
                    if (PreviewLabel.this.name.equals(name)) {
                        synchronized (image) {
                            image = ImageIO.read(new ByteArrayInputStream(data));
                            repaint();
                        }
                    }
                } else {
                    notFoundSet.add(name);
                    if (PreviewLabel.this.name.equals(name)) {
                        synchronized (image) {
                            image = noPreviewImage;
                            repaint();
                        }
                    }
                }
            } catch (Exception e) {
                notFoundSet.add(name);
                if (PreviewLabel.this.name.equals(name)) {
                    synchronized (image) {
                        image = noPreviewImage;
                        repaint();
                    }
                }
            }
        }
    }
}
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