core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/text/completion/ScriptCompletionProposalFactoryRegistry.java

/*******************************************************************************
 * Copyright (c) 2011 NumberFour AG
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     NumberFour AG - initial API and Implementation (Alex Panchenko)
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.text.completion;

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.dltk.ui.DLTKUIPlugin;
import org.eclipse.dltk.ui.text.completion.IScriptCompletionProposalFactory;
import org.eclipse.dltk.utils.NatureExtensionManager;

public class ScriptCompletionProposalFactoryRegistry {

	public static final String EXT_POINT = DLTKUIPlugin.PLUGIN_ID + ".completion";

	private static NatureExtensionManager<IScriptCompletionProposalFactory> manager = null;

	public static IScriptCompletionProposalFactory[] getFactories(String natureId) {
		if (manager == null) {
			synchronized (ScriptCompletionProposalFactoryRegistry.class) {
				if (manager == null) {
					manager = new NatureExtensionManager<IScriptCompletionProposalFactory>(EXT_POINT,
							IScriptCompletionProposalFactory.class) {
						@Override
						protected boolean isValidElement(IConfigurationElement element) {
							return "proposalFactory".equals(element.getName());
						}
					};
				}
			}

		}
		return manager.getInstances(natureId);
	}

}