| /******************************************************************************* |
| * Copyright (c) 2005, 2016 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.dltk.core; |
| |
| import org.eclipse.core.resources.IProject; |
| |
| /** |
| * Selects a contributed extension implementation based upon the <code>id</code> |
| * it was registered with when the plugin containing its extension definition |
| * was loaded. |
| * |
| * <p> |
| * If a saved contribution id can not be found, the implementation will fall |
| * back to selecting based upon priority. |
| * </p> |
| */ |
| public abstract class DLTKIdContributionSelector extends |
| DLTKPriorityContributionSelector { |
| |
| /** |
| * Selects the contribution implementation currently in use as defined by |
| * the user's preferences. |
| * |
| * @param contributions |
| * list of contribution implementations |
| * |
| * @return currently selected implementation |
| */ |
| @Override |
| public IDLTKContributedExtension select( |
| IDLTKContributedExtension[] contributions, IProject project) { |
| PreferencesLookupDelegate delegate = new PreferencesLookupDelegate( |
| project); |
| String id = getSavedContributionId(delegate); |
| |
| if (id != null) { |
| for (int i = 0; i < contributions.length; i++) { |
| IDLTKContributedExtension contrib = contributions[i]; |
| if (contrib.getId().equals(id)) { |
| return contrib; |
| } |
| } |
| } |
| |
| /* |
| * if a contribution was not found that matched the saved contribution |
| * id, pick one based upon its priority |
| */ |
| return super.select(contributions, project); |
| } |
| |
| /** |
| * Returns the id of the currently selected contribution. |
| * |
| * <p> |
| * Sub-classes should use the preference lookup delegate to retrieve the |
| * saved value. |
| * </p> |
| */ |
| protected abstract String getSavedContributionId( |
| PreferencesLookupDelegate delegate); |
| |
| } |