InstanceToServiceProviderAdapter


1   /*******************************************************************************
2    * Copyright (c) 2005 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.ui.internal.components.util;
12  
13  import org.eclipse.core.runtime.IAdaptable;
14  import org.eclipse.ui.internal.components.framework.IServiceProvider;
15  
16  /**
17   * Converts an existing POJO into an IComponentProvider that returns the object itself
18   * whenever asked for a class that the POJO implements. If the object implements IAdaptable,
19   * it will also return adapters from the object.
20   * 
21   * <p>EXPERIMENTAL: The components framework is currently under active development. All
22   * aspects of this class including its existence, name, and public interface are likely
23   * to change during the development of Eclipse 3.1</p>
24   * 
25   * @since 3.1
26   */
27  public final class InstanceToServiceProviderAdapter implements IServiceProvider {
28      private Object   existingObject;
29      
30      public InstanceToServiceProviderAdapter(Object   existingObject) {
31          this.existingObject = existingObject;
32      }
33      
34      /* (non-Javadoc)
35       * @see org.eclipse.core.components.IComponentProvider#getComponent(java.lang.Object)
36       */
37      public Object   getService(Object   key) {
38          if (key instanceof Class  ) {
39              Class   c = (Class  )key;
40              
41              if (c.isInstance(existingObject)) {
42                  return existingObject;
43              }
44              
45              if (existingObject instanceof IAdaptable) {
46                  return ((IAdaptable)existingObject).getAdapter(c);
47              }
48          }
49          return null;
50      }
51      
52      /* (non-Javadoc)
53       * @see org.eclipse.core.components.IComponentProvider#hasKey(java.lang.Object)
54       */
55      public boolean hasService(Object   key) {
56          return getService(key) != null;
57      }
58  }
59
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags