| /****************************************************************************** |
| * Copyright (c) 2002, 2003 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.gmf.runtime.common.core.service; |
| |
| /** |
| * The interface for all service providers lightweight's implementation. Specifies |
| * a single part of the contract between a service and its providers: |
| * <ul> |
| * <li>A service can request a provider whether it wants to support a given |
| * request |
| * </ul> |
| * <p> |
| * Service implementers are not expected to implement this interface. |
| * </p> |
| * <p> |
| * Service provider implementers should implement this interface directly in a |
| * lightweight plug-in should they need to be more aggressive at preventing the |
| * loading of the provider heavyweight plug-in. A provider need to expose the |
| * class implementing this interface in the class attribute of a Policy |
| * sub-element in their provider extension descriptor. |
| * </p> |
| * Provider's plugin.xml |
| * <p> |
| * |
| * <pre> |
| * |
| * <extension |
| * id="..." |
| * name="..." |
| * point="..."> |
| * <XXXProvider |
| * class="..."> |
| * <Priority |
| * name="..."> |
| * </Priority> |
| * <Policy |
| * class="com.example.myClass" |
| * plugin="com.example.myLightWeightPlugin"/> |
| * </XXXProvider> |
| * </extension> |
| * |
| * </pre> |
| * |
| * </p> |
| */ |
| public interface IProviderPolicy { |
| |
| /** |
| * Indicates whether this provider provides the specified operation. |
| * <p> |
| * <p> |
| * Providers generally cast the operation to a service specific |
| * {@link IOperation}-derived class in order to determine whether they |
| * support the request. |
| * |
| * @return <code>true</code> if this provider provides the operation; |
| * <code>false</code> otherwise. |
| * @param operation |
| * The operation in question. |
| */ |
| public boolean provides(IOperation operation); |
| |
| } |
