core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/dialogs/StatusUtil.java

/*******************************************************************************
 * Copyright (c) 2000, 2018 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
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.dialogs;

import java.util.List;

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.
	 */
	public static IStatus getMoreSevere(IStatus s1, IStatus s2) {
		if (s1.getSeverity() > s2.getSeverity()) {
			return s1;
		}
		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.
	 */
	public static IStatus getMostSevere(IStatus[] status) {
		IStatus max = null;
		for (int i = 0; i < status.length; i++) {
			IStatus curr = status[i];
			if (curr == null) {
				continue;
			}
			if (curr.matches(IStatus.ERROR)) {
				return curr;
			}
			if (max == null || curr.getSeverity() > max.getSeverity()) {
				max = curr;
			}
		}
		return max;
	}

	/**
	 * Tests if the specified list contains errors
	 */
	public static boolean isError(List<IStatus> statuses) {
		for (IStatus curr : statuses) {
			if (curr.matches(IStatus.ERROR)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Applies the status to the status line of a dialog page.
	 */
	public static void applyToStatusLine(DialogPage page, IStatus status) {
		String message = status.getMessage();
		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:
			if (message.length() == 0) {
				message = null;
			}
			page.setMessage(null);
			page.setErrorMessage(message);
			break;
		}
	}
}