/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.ui.dialogs;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.jface.dialogs.DialogPage;
import org.eclipse.jface.dialogs.IMessageProvider;

/**
 * A utility class to work with IStatus.
 */
public class StatusUtil {

	/**
	 * Compares two instances of <code>IStatus</code>. The more severe is returned:
	 * An error is more severe than a warning, and a warning is more severe
	 * than ok. If the two stati have the same severity, the second is returned.
	 * @param s1 first status
	 * @param s2 second status
	 * @return the more severe status
	 */
	public static IStatus getMoreSevere(IStatus s1, IStatus s2) {
		if (s1.getSeverity() > s2.getSeverity()) {
			return s1;
		} else {
			return s2;
		}
	}

	/**
	 * Finds the most severe status from a array of stati.
	 * An error is more severe than a warning, and a warning is more severe
	 * than ok.
	 * @param status an array of stati
	 * @return the most severe status
	 */
	public static IStatus getMostSevere(IStatus[] status) {
		IStatus max= null;
		for (int i= 0; i < status.length; i++) {
			IStatus curr= status[i];
			if (curr.matches(IStatus.ERROR)) {
				return curr;
			}
			if (max == null || curr.getSeverity() > max.getSeverity()) {
				max= curr;
			}
		}
		return max;
	}

	/**
	 * Applies the status to the status line of a dialog page.
	 * @param page the dialog page
	 * @param status the status to apply
	 */
	public static void applyToStatusLine(DialogPage page, IStatus status) {
		String message= status.getMessage();
		if (message != null && message.length() == 0) {
			message= null;
		}
		switch (status.getSeverity()) {
			case IStatus.OK:
				page.setMessage(message, IMessageProvider.NONE);
				page.setErrorMessage(null);
				break;
			case IStatus.WARNING:
				page.setMessage(message, IMessageProvider.WARNING);
				page.setErrorMessage(null);
				break;
			case IStatus.INFO:
				page.setMessage(message, IMessageProvider.INFORMATION);
				page.setErrorMessage(null);
				break;
			default:
				page.setMessage(null);
				page.setErrorMessage(message);
				break;
		}
	}
}
