| /* |
| * Copyright (c) 2008, 2009, 2011, 2012, 2015 Eike Stepper (Berlin, Germany) 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: |
| * Eike Stepper - initial API and implementation |
| */ |
| package org.eclipse.net4j.util.factory; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtensionRegistry; |
| |
| /** |
| * A {@link IFactory factory} that delegates to an {@link IExtensionRegistry extension registry} contribution. |
| * <p> |
| * Example contribution: |
| * |
| * <pre> |
| * <extension |
| * point="org.eclipse.net4j.util.factories"> |
| * <factory |
| * class="org.eclipse.net4j.util.concurrent.TimerLifecycle$DaemonFactory" |
| * productGroup="org.eclipse.net4j.util.timers" |
| * type="daemon"/> |
| * </extension> |
| * </pre> |
| * |
| * @author Eike Stepper |
| * @noextend This class is not intended to be subclassed by clients. |
| * @apiviz.exclude |
| */ |
| public class FactoryDescriptor extends Factory |
| { |
| private static final String ATTR_PRODUCT_GROUP = "productGroup"; //$NON-NLS-1$ |
| |
| private static final String ATTR_TYPE = "type"; //$NON-NLS-1$ |
| |
| private static final String ATTR_CLASS = "class"; //$NON-NLS-1$ |
| |
| private IConfigurationElement configurationElement; |
| |
| public FactoryDescriptor(IConfigurationElement configurationElement) |
| { |
| super(createFactoryKey(configurationElement)); |
| this.configurationElement = configurationElement; |
| } |
| |
| public IConfigurationElement getConfigurationElement() |
| { |
| return configurationElement; |
| } |
| |
| public IFactory createFactory() |
| { |
| try |
| { |
| return (IFactory)configurationElement.createExecutableExtension(ATTR_CLASS); |
| } |
| catch (CoreException ex) |
| { |
| throw new FactoryCreationException(ex); |
| } |
| } |
| |
| public Object create(String description) |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public String getDescriptionFor(Object product) |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| private static FactoryKey createFactoryKey(IConfigurationElement element) |
| { |
| String productGroup = element.getAttribute(ATTR_PRODUCT_GROUP); |
| String type = element.getAttribute(ATTR_TYPE); |
| return new FactoryKey(productGroup, type); |
| } |
| } |