p2pactivator.java

mywork是rcp开发的很好的例子

package net.sf.p2pim;

import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

import net.sf.component.config.ConfigHelper;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.ui.internal.util.BundleUtility;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * The activator class controls the plug-in life cycle
 */
public class P2PActivator extends AbstractUIPlugin {

	// The plug-in ID
	public static final String PLUGIN_ID = "net.sf.p2pim";

	// The shared instance
	private static P2PActivator plugin;
	
	/**
	 * The constructor
	 */
	public P2PActivator() {
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext context) throws Exception {
		super.start(context);
		plugin = this;
		//判断表情符图片是否存在，不存在则拷贝一份
		if (!new File(ConfigHelper.getDataHome() + "/data/embed/faces/01.jpg").exists()) {

			final File dstFile = new File(ConfigHelper.getDataHome() + "/data/embed/faces/");
			dstFile.mkdirs();
			final String src = FileLocator.toFileURL(BundleUtility.find(P2PActivator.PLUGIN_ID, "icons/faces/")).getPath();
			File[] listFiles = new File(src).listFiles(new FileFilter() {
				public boolean accept(File arg0) {
					return arg0.getName().endsWith("jpg");
				}
			});
			for (File f : listFiles) {
				copy(f, new File(dstFile, f.getName()));
			}
		}
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext context) throws Exception {
		plugin = null;
		super.stop(context);
	}

	/**
	 * Returns the shared instance
	 *
	 * @return the shared instance
	 */
	public static P2PActivator getDefault() {
		return plugin;
	}

	/**
	 * Returns an image descriptor for the image file at the given
	 * plug-in relative path
	 *
	 * @param path the path
	 * @return the image descriptor
	 */
	public static ImageDescriptor getImageDescriptor(String path) {
		return imageDescriptorFromPlugin(PLUGIN_ID, path);
	}
	
	/** Fast & simple file copy. */
	public static void copy(File source, File dest) throws IOException {
	     FileChannel in = null, out = null;
	     try {          
	          in = new FileInputStream(source).getChannel();
	          out = new FileOutputStream(dest).getChannel();
	 
	          long size = in.size();
	          MappedByteBuffer buf = in.map(FileChannel.MapMode.READ_ONLY, 0, size);
	 
	          out.write(buf);
	 
	     } finally {
	          if (in != null)          in.close();
	          if (out != null)     out.close();
	     }
	}
}