猜国旗_附程序源代码

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 I = m_ClassImageMap.keySet().iterator(); I.hasNext();) { String key = (String) 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); } }