net.roamstudio.roamflow.util.ImagesUtil.java Source code

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Here is the source code for net.roamstudio.roamflow.util.ImagesUtil.java

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/*
 * Copyright (C) 2006-2010, Roamstudio Members
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, email to roamstudio@163.com
 */
package net.roamstudio.roamflow.util;

import java.io.File;
import java.net.URL;
import java.util.HashSet;
import java.util.Set;

import net.roamstudio.roamflow.RoamflowActivator;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.osgi.framework.Bundle;

/**
 * Cache project's image by a java.util.HashSet.
 * 
 * @author chinakite zhang
 *
 */
public class ImagesUtil {

    private ImagesUtil() {
    }

    private static ImageRegistry register = new ImageRegistry();

    private static Set<String> keys = new HashSet<String>();

    static {
        initial();
    }

    /**
     * Get a ImageDescriptor.
     * @param key
     * @return
     */
    public static ImageDescriptor getDescriptor(String key) {
        ImageDescriptor image = register.getDescriptor(key);
        if (image == null) {
            image = ImageDescriptor.getMissingImageDescriptor();
        }
        return image;
    }

    /**
     * Get a Image.
     * @param key
     * @return
     */
    public static Image get(String key) {
        Image image = register.get(key);
        if (image == null) {
            image = ImageDescriptor.getMissingImageDescriptor().createImage();
        }
        return image;
    }

    public static String[] getImageKey() {
        return (String[]) keys.toArray(new String[keys.size()]);
    }

    private static void initial() {
        Bundle bundle = Platform.getBundle(RoamflowActivator.PLUGIN_ID);
        URL url = bundle.getEntry("icons");
        try {
            url = FileLocator.toFileURL(url);
        } catch (Exception e) {
            e.printStackTrace();
        }
        File file = new File(url.getPath());
        File[] images = file.listFiles();
        for (int i = 0; i < images.length; i++) {
            File f = images[i];
            if (!f.isFile()) {
                continue;
            }
            String name = f.getName();
            if (!name.endsWith(".gif") && !name.endsWith(".ico")) {
                continue;
            }
            String key = name.substring(0, name.indexOf('.'));
            URL fullPathString = bundle.getEntry("icons/" + name);
            ImageDescriptor des = ImageDescriptor.createFromURL(fullPathString);
            register.put(key, des);
            keys.add(key);
        }
    }
}