SimpleCSContentProvider


1   /*******************************************************************************
2    * Copyright (c) 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.pde.internal.ui.editor.cheatsheet.simple;
13  
14  import java.util.List  ;
15  
16  import org.eclipse.jface.viewers.ITreeContentProvider;
17  import org.eclipse.pde.internal.core.icheatsheet.simple.ISimpleCSModel;
18  import org.eclipse.pde.internal.core.icheatsheet.simple.ISimpleCSObject;
19  import org.eclipse.pde.internal.ui.elements.DefaultContentProvider;
20  
21  /**
22   * SimpleCSContentProvider
23   *
24   */
25  public class SimpleCSContentProvider extends DefaultContentProvider implements
26          ITreeContentProvider {
27  
28      /**
29       * 
30       */
31      public SimpleCSContentProvider() {
32          // NO-OP
33      }
34  
35      /* (non-Javadoc)
36       * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
37       */
38      public Object  [] getChildren(Object   parentElement) {
39          if (parentElement instanceof ISimpleCSModel) {
40              return new Object  []{((ISimpleCSModel)parentElement).getSimpleCS()};
41          } else if (parentElement instanceof ISimpleCSObject) {
42              List   list = ((ISimpleCSObject)parentElement).getChildren();
43              // List is never null
44              if (list.size() > 0) {
45                  return list.toArray();
46              }
47          }
48          return new Object  [0];
49      }
50  
51      /* (non-Javadoc)
52       * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
53       */
54      public Object   getParent(Object   element) {
55          if (element instanceof ISimpleCSObject) {
56              return ((ISimpleCSObject)element).getParent();
57          }
58          return null;
59      }
60  
61      /* (non-Javadoc)
62       * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
63       */
64      public boolean hasChildren(Object   element) {
65          return (getChildren(element).length > 0);
66      }
67  
68      /* (non-Javadoc)
69       * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
70       */
71      public Object  [] getElements(Object   inputElement) {
72          return getChildren(inputElement);
73      }
74  
75  }
76
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