ArrayContentProvider


1   /*******************************************************************************
2    * Copyright (c) 2000, 2006 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  
12  package org.eclipse.jface.viewers;
13  
14  import java.util.Collection  ;
15  
16  /**
17   * This implementation of <code>IStructuredContentProvider</code> handles
18   * the case where the viewer input is an unchanging array or collection of elements.
19   * <p>
20   * This class is not intended to be subclassed outside the viewer framework.
21   * </p> 
22   * 
23   * @since 2.1
24   */
25  public class ArrayContentProvider implements IStructuredContentProvider {
26  
27      /**
28       * Returns the elements in the input, which must be either an array or a
29       * <code>Collection</code>. 
30       */
31      public Object  [] getElements(Object   inputElement) {
32          if (inputElement instanceof Object  []) {
33              return (Object  []) inputElement;
34          }
35          if (inputElement instanceof Collection  ) {
36              return ((Collection  ) inputElement).toArray();
37          }
38          return new Object  [0];
39      }
40  
41      /**
42       * This implementation does nothing.
43       */
44      public void inputChanged(Viewer viewer, Object   oldInput, Object   newInput) {
45          // do nothing.
46      }
47  
48      /**
49       * This implementation does nothing.
50       */
51      public void dispose() {
52          // do nothing.
53      }
54  }
55
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