com.foosbar.mailsnag.commands.DeleteMessage.java Source code

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Here is the source code for com.foosbar.mailsnag.commands.DeleteMessage.java

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/*******************************************************************************
 * Copyright (c) 2010-2013 Foos-Bar.com
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * Kevin Kelley - initial API and implementation
 *******************************************************************************/
package com.foosbar.mailsnag.commands;

import java.util.Iterator;
import java.util.ResourceBundle;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.handlers.HandlerUtil;

import com.foosbar.mailsnag.Activator;
import com.foosbar.mailsnag.model.Message;
import com.foosbar.mailsnag.util.MessageStore;
import com.foosbar.mailsnag.views.MessagesView;

/**
 * Handler for deleting selected messages. One or more messages can be selected
 * in the Email view and deleted all at once. This handler will get an
 * IStructuredSelection object containing references to those items selected.
 * 
 * @author kkelley (dev@foos-bar.com)
 * 
 */
public class DeleteMessage extends AbstractHandler {

    /**
     * Main execution
     */
    public Object execute(ExecutionEvent event) throws ExecutionException {

        IWorkbenchPart part = HandlerUtil.getActivePart(event);

        if (part instanceof MessagesView) {

            final MessagesView viewer = (MessagesView) part;

            viewer.showLogo();

            IStructuredSelection iss = (IStructuredSelection) HandlerUtil.getCurrentSelection(event);

            if (!iss.isEmpty()) {
                String message = getConfirmationMessage(iss.size());

                ResourceBundle BUNDLE = Activator.getResourceBundle();
                boolean confirm = MessageDialog.openConfirm(viewer.getViewer().getControl().getShell(),
                        BUNDLE.getString("action.delete.confirm"), message);

                if (confirm) {
                    deleteMessages(iss, viewer);
                }
            }
        }
        return null;
    }

    /**
     * Formats the confirmation message based on the selection size to be
     * deleted.
     * 
     * @param size
     *            Number of items selected for deletion
     * @return the confirmation message
     */
    private String getConfirmationMessage(int size) {

        ResourceBundle BUNDLE = Activator.getResourceBundle();

        if (size == 1) {
            return BUNDLE.getString("action.delete.confirm.single");
        }

        return String.format(BUNDLE.getString("action.delete.confirm.plural"), size);
    }

    /**
     * Deletes the message from the filesystem and removes the entry from the
     * Mail View.
     * 
     * @param iss
     *            The selected items
     * @param viewer
     *            The viewer that contains the selected items
     */
    private void deleteMessages(IStructuredSelection iss, MessagesView viewer) {
        @SuppressWarnings("unchecked")
        Iterator<Object> it = iss.iterator();
        while (it.hasNext()) {
            Object obj = it.next();
            if (obj instanceof Message) {
                Message m = (Message) obj;
                MessageStore.delete(m);
            }
        }
        viewer.getViewer().refresh();
    }
}