deletemessageaction.java

mywork是rcp开发的很好的例子

package net.sf.pim.mail.reader;

import javax.mail.Flags;
import javax.mail.Message;
import javax.mail.MessagingException;

import jp.gr.java_conf.roadster.net.pop.MessageIndex;
import jp.gr.java_conf.roadster.net.pop.POP3Folder;
import jp.gr.java_conf.roadster.net.pop.POP3Message;
import net.sf.pim.mail.MailPlugin;

import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
/**
 * 删除邮件
 * @author levin
 */
public class DeleteMessageAction implements IWorkbenchWindowActionDelegate {

	protected FolderViewer folderViewer;
	
	public void dispose() {

	}

	public void init(IWorkbenchWindow window) {
		folderViewer=(FolderViewer) window.getActivePage().findView(FolderViewer.ID);
	}

	public void run(IAction action) {
		moveMessage(MailPlugin.TRASHBOX);
	}

	protected void moveMessage(String targetFolder) {
		if(folderViewer.getViewer().getSelection().isEmpty())
			return ;
		//搜索箱不操作
		if (folderViewer.getFolder().getName().equalsIgnoreCase(MailPlugin.SEARCHBOX))
			return;		
		//如果是垃圾箱，则彻底删除，其他的，则转移至垃圾箱
		POP3Message message=(POP3Message) ((StructuredSelection)folderViewer.getViewer().getSelection()).getFirstElement();
		try {
			if (!folderViewer.getFolder().getName().equalsIgnoreCase(targetFolder)) {
				message.getFolder().getStore().getFolder(targetFolder).appendMessages(new Message[] { message });
			}else if(targetFolder.equals(MailPlugin.TRASHBOX)){
				//垃圾箱的删除，清除邮件头缓存
				MessageIndex.getHEADERS_MAP().remove(message.getInternalFileName());
			}
			//清除已读标记
			FolderViewer.getReadSet().remove(message.getInternalFileName());
			message.setFlag(Flags.Flag.DELETED, true);
			((POP3Folder)message.getFolder()).expunge();
		} catch (MessagingException e) {
			e.printStackTrace();
		}
	}

	public void selectionChanged(IAction action, ISelection selection) {

	}

}