SwingResourceManager.java Source code

Introduction

Here is the source code for SwingResourceManager.java

Source

//package com.swtdesigner;

import java.awt.Image;
import java.awt.Toolkit;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import javax.swing.ImageIcon;

/**
 * Utility class for managing resources such as colors, fonts, images, etc.
 * 
 * This class may be freely distributed as part of any application or plugin.
 * <p>
 * Copyright (c) 2003 - 2004, Instantiations, Inc. <br>All Rights Reserved
 * 
 * @author scheglov_ke
 */
public class SwingResourceManager {

    /**
     * Maps image names to images
     */
    private static HashMap<String, Image> m_ClassImageMap = new HashMap<String, Image>();

    /**
     * Returns an image encoded by the specified input stream
     * @param is InputStream The input stream encoding the image data
     * @return Image The image encoded by the specified input stream
     */
    private static Image getImage(InputStream is) {
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            byte buf[] = new byte[1024 * 4];
            while (true) {
                int n = is.read(buf);
                if (n == -1)
                    break;
                baos.write(buf, 0, n);
            }
            baos.close();
            return Toolkit.getDefaultToolkit().createImage(baos.toByteArray());
        } catch (Throwable e) {
            return null;
        }
    }

    /**
     * Returns an image stored in the file at the specified path relative to the specified class
     * @param clazz Class The class relative to which to find the image
     * @param path String The path to the image file
     * @return Image The image stored in the file at the specified path
     */
    public static Image getImage(Class<?> clazz, String path) {
        String key = clazz.getName() + '|' + path;
        Image image = m_ClassImageMap.get(key);
        if (image == null) {
            if ((path.length() > 0) && (path.charAt(0) == '/')) {
                String newPath = path.substring(1, path.length());
                image = getImage(new BufferedInputStream(clazz.getClassLoader().getResourceAsStream(newPath)));
            } else {
                image = getImage(clazz.getResourceAsStream(path));
            }
            m_ClassImageMap.put(key, image);
        }
        return image;
    }

    /**
     * Returns an image stored in the file at the specified path
     * @param path String The path to the image file
     * @return Image The image stored in the file at the specified path
     */
    public static Image getImage(String path) {
        return getImage("default", path); //$NON-NLS-1$
    }

    /**
     * Returns an image stored in the file at the specified path
     * @param section String The storage section in the cache
     * @param path String The path to the image file
     * @return Image The image stored in the file at the specified path
     */
    public static Image getImage(String section, String path) {
        String key = section + '|' + SwingResourceManager.class.getName() + '|' + path;
        Image image = m_ClassImageMap.get(key);
        if (image == null) {
            try {
                FileInputStream fis = new FileInputStream(path);
                image = getImage(fis);
                m_ClassImageMap.put(key, image);
                fis.close();
            } catch (IOException e) {
                return null;
            }
        }
        return image;
    }

    /**
    * Clear cached images in specified section
    * @param section the section do clear
    */
    public static void clearImages(String section) {
        for (Iterator<String> I = m_ClassImageMap.keySet().iterator(); I.hasNext();) {
            String key = I.next();
            if (!key.startsWith(section + '|'))
                continue;
            Image image = m_ClassImageMap.get(key);
            image.flush();
            I.remove();
        }
    }

    /**
     * Returns an icon stored in the file at the specified path relative to the specified class
     * @param clazz Class The class relative to which to find the icon
     * @param path String The path to the icon file
     * @return Icon The icon stored in the file at the specified path
     */
    public static ImageIcon getIcon(Class<?> clazz, String path) {
        return getIcon(getImage(clazz, path));
    }

    /**
     * Returns an icon stored in the file at the specified path
     * @param path String The path to the icon file
     * @return Icon The icon stored in the file at the specified path
     */
    public static ImageIcon getIcon(String path) {
        return getIcon("default", path); //$NON-NLS-1$
    }

    /**
     * Returns an icon stored in the file at the specified path
     * @param section String The storage section in the cache
     * @param path String The path to the icon file
     * @return Icon The icon stored in the file at the specified path
     */
    public static ImageIcon getIcon(String section, String path) {
        return getIcon(getImage(section, path));
    }

    /**
     * Returns an icon based on the specified image
     * @param image Image The original image
     * @return Icon The icon based on the image
     */
    public static ImageIcon getIcon(Image image) {
        if (image == null)
            return null;
        return new ImageIcon(image);
    }
}