bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/dialogs/NewWizardCollectionComparator.java

/*******************************************************************************
 * Copyright (c) 2000, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.internal.dialogs;

import org.eclipse.jface.viewers.IBasicPropertyConstants;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.ui.internal.registry.WizardsRegistryReader;

/**
 * A Viewer element sorter that sorts Elements by their name attribute. Note
 * that capitalization differences are not considered by this sorter, so a <
 * B < c.
 *
 * NOTE one exception to the above: an element with the system's reserved name
 * for base Wizards will always be sorted such that it will ultimately be placed
 * at the beginning of the sorted result.
 */
class NewWizardCollectionComparator extends ViewerComparator {
	/**
	 * Static instance of this class.
	 */
	public static final NewWizardCollectionComparator INSTANCE = new NewWizardCollectionComparator();

	/**
	 * Creates an instance of <code>NewWizardCollectionSorter</code>. Since this is
	 * a stateless sorter, it is only accessible as a singleton; the private
	 * visibility of this constructor ensures this.
	 */
	private NewWizardCollectionComparator() {
		super();
	}

	@Override
	public int category(Object element) {
		if (element instanceof WorkbenchWizardElement) {
			return -1;
		}
		if (element instanceof WizardCollectionElement) {
			String id = ((WizardCollectionElement) element).getId();
			if (WizardsRegistryReader.GENERAL_WIZARD_CATEGORY.equals(id)) {
				return 1;
			}
			if (WizardsRegistryReader.UNCATEGORIZED_WIZARD_CATEGORY.equals(id)) {
				return 3;
			}
			if (WizardsRegistryReader.FULL_EXAMPLES_WIZARD_CATEGORY.equals(id)) {
				return 4;
			}
			return 2;
		}
		return super.category(element);
	}

	/**
	 * Return true if this sorter is affected by a property change of propertyName
	 * on the specified element.
	 */
	@Override
	public boolean isSorterProperty(Object object, String propertyId) {
		return propertyId.equals(IBasicPropertyConstants.P_TEXT);
	}
}