net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpeclipse/xml/ui/internal/outline/XMLOutlineContentProvider.java

   1 /*
   2  * Copyright (c) 2004 Christopher Lenz and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     Christopher Lenz - initial API and implementation
  10  *
  11  * $Id: XMLOutlineContentProvider.java,v 1.3 2006-10-21 23:14:14 pombredanne Exp $
  12  */
  13
  14 package net.sourceforge.phpeclipse.xml.ui.internal.outline;
  15
  16 import net.sourceforge.phpeclipse.xml.core.model.IXMLDocument;
  17 import net.sourceforge.phpeclipse.xml.core.model.IXMLElement;
  18
  19 import org.eclipse.jface.viewers.ITreeContentProvider;
  20 import org.eclipse.jface.viewers.Viewer;
  21
  22 /**
  23  * Content provider for the XML outline page.
  24  */
  25 public class XMLOutlineContentProvider implements ITreeContentProvider {
  26
  27         // Instance Variables ------------------------------------------------------
  28
  29         /**
  30          * The parsed XML document.
  31          */
  32         private IXMLDocument document;
  33
  34         // ITreeContentProvider Implementation -------------------------------------
  35
  36         /*
  37          * ITreeContentProvider#getChildren(Object)
  38          */
  39         public Object[] getChildren(Object parentElement) {
  40                 if (parentElement instanceof IXMLElement) {
  41                         return ((IXMLElement) parentElement).getChildren();
  42                 }
  43                 return new Object[0];
  44         }
  45
  46         /*
  47          * @see ITreeContentProvider#getParent(Object)
  48          */
  49         public Object getParent(Object element) {
  50                 if (element instanceof IXMLElement) {
  51                         return ((IXMLElement) element).getParent();
  52                 }
  53                 return null;
  54         }
  55
  56         /*
  57          * @see ITreeContentProvider#hasChildren(Object)
  58          */
  59         public boolean hasChildren(Object element) {
  60                 return getChildren(element).length > 0;
  61         }
  62
  63         /*
  64          * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(Object)
  65          */
  66         public Object[] getElements(Object inputElement) {
  67                 if ((document != null) && (document.getRoot() != null)) {
  68                         return new Object[] { document.getRoot() };
  69                 }
  70                 return new Object[0];
  71         }
  72
  73         /*
  74          * @see org.eclipse.jface.viewers.IContentProvider#dispose()
  75          */
  76         public void dispose() {
  77                 document = null;
  78         }
  79
  80         /*
  81          * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(Viewer,
  82          *      Object, Object)
  83          */
  84         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  85                 if (oldInput != newInput) {
  86                         if (oldInput instanceof IXMLDocument) {
  87                                 document = null;
  88                         }
  89                         if (newInput instanceof IXMLDocument) {
  90                                 document = (IXMLDocument) newInput;
  91                         }
  92                 }
  93         }
  94
  95 }