DeviceDialog.java

/*
 * Copyright 2008-2012 Amazon Technologies, Inc. 
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at:
 * 
 *    http://aws.amazon.com/apache2.0
 *
 * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES 
 * OR CONDITIONS OF ANY KIND, either express or implied. See the 
 * License for the specific language governing permissions and 
 * limitations under the License. 
 */

package com.amazonaws.eclipse.ec2.ui.views.instances;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

/**
 * Dialog allowing the user to select which device an EBS volume should be
 * attached to.
 */
class DeviceDialog extends MessageDialog {

	/** The default device to attach a volume to */
	private static final String DEFAULT_DEVICE = "/dev/sdh";

	/** Stores the selected device after this dialog is disposed */
	private String device;
	
	/** The combo box where the user selects the device */
	private Combo deviceCombo;

	/**
	 * Creates a new DeviceDialog ready to be opened.
	 */
	public DeviceDialog() {
		super(new Shell(),
				"Select Device",
				null,
				"Select the device to attach this volume to.",
				MessageDialog.QUESTION,
				new String[] {"OK", "Cancel"},
				0);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.dialogs.MessageDialog#createCustomArea(org.eclipse.swt.widgets.Composite)
	 */
	@Override
	protected Control createCustomArea(Composite parent) {
		Composite composite = new Composite(parent, SWT.NONE);
		composite.setLayoutData(new GridData(GridData.FILL_BOTH));
		composite.setLayout(new GridLayout(2, false));
		
		Label label = new Label(composite, SWT.NONE);
		label.setText("Device:");
		
		deviceCombo = new Combo(composite, SWT.READ_ONLY);
		deviceCombo.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		
		String devicePrefix = "/dev/sd";
		for (char c = 'b'; c <= 'z'; c++) {
			deviceCombo.add(devicePrefix + c);			
		}
		deviceCombo.setText(DEFAULT_DEVICE);
		
		return composite;			
	}
	
	/**
	 * Returns the device the user selected (ex: '/dev/sdh').
	 * 
	 * @return The device the user selected (ex: '/dev/sdh').
	 */
	public String getDevice() {
		return device;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.dialogs.MessageDialog#buttonPressed(int)
	 */
	@Override
	protected void buttonPressed(int buttonId) {
		if (buttonId == DeviceDialog.OK) {
			device = deviceCombo.getText();
		}

		super.buttonPressed(buttonId);
	}
	
}