/*******************************************************************************
 * Copyright (c) 2000, 2004 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.ui;

import org.eclipse.core.resources.IMarker;

/** 
 * Registry of F1 help contexts and resolutions for markers.
 * <p>
 * The information contained in the registry is read from the 
 * org.eclipse.ui.markerhelp and org.eclipse.ui.markerresolution
 * extension points.
 * </p>
 * 
 * @since 2.0
 */
public interface IMarkerHelpRegistry {
    /**
     * Returns a help context id for the given marker or
     * <code>null</code> if no help has been registered 
     * for the marker.
     * 
     * @param marker the marker for which to obtain help
     * @since 2.0
     */
    public String getHelp(IMarker marker);

    /**
     * Returns <code>false</code> if there are no resolutions for 
     * the given marker. Returns <code>true</code> if their may
     * be resolutions. In most cases a <code>true</code> value 
     * means there are resolutions but due to plugin loading 
     * issues getResolutions may sometimes return an empty array
     * after this method returns <code>true</code>. 
     * 
     * @param marker the marker for which to determine if there
     * are resolutions
     * @since 2.0
     */
    public boolean hasResolutions(IMarker marker);

    /**
     * Returns an array of resolutions for the given marker. 
     * The returned array will be empty if there are no resolutions
     * for the marker.
     * 
     * @param marker the marker for which to obtain resolutions
     * @since 2.0
     */
    public IMarkerResolution[] getResolutions(IMarker marker);
}