archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/outline/CssOutlineContentProvider.java

   1 /*
   2  * Copyright (c) 2003-2004 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: CssOutlineContentProvider.java,v 1.1 2004-09-02 18:11:49 jsurfer Exp $
  12  */
  13
  14 package net.sourceforge.phpeclipse.css.ui.internal.outline;
  15
  16 import net.sourceforge.phpeclipse.css.core.model.IRule;
  17 import net.sourceforge.phpeclipse.css.core.model.IStyleSheet;
  18
  19 import org.eclipse.jface.viewers.ITreeContentProvider;
  20 import org.eclipse.jface.viewers.Viewer;
  21
  22 /**
  23  * Content provider for the CSS outline page.
  24  */
  25 public class CssOutlineContentProvider implements ITreeContentProvider {
  26
  27         // Instance Variables ------------------------------------------------------
  28
  29         /**
  30          * The parsed style sheet.
  31          */
  32         private IStyleSheet styleSheet;
  33
  34         // ITreeContentProvider Implementation -------------------------------------
  35
  36         /*
  37          * ITreeContentProvider#getChildren(Object)
  38          */
  39         public Object[] getChildren(Object parentElement) {
  40                 if (parentElement instanceof IRule) {
  41                         return ((IRule) 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 IRule) {
  51                         return ((IRule) 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 (styleSheet != null) {
  68                         return styleSheet.getRules();
  69                 }
  70                 return new Object[0];
  71         }
  72
  73         /*
  74          * @see org.eclipse.jface.viewers.IContentProvider#dispose()
  75          */
  76         public void dispose() {
  77                 styleSheet = null;
  78         }
  79
  80         /*
  81          * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(Viewer, Object, Object)
  82          */
  83         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  84                 if (oldInput != newInput) {
  85                         if (oldInput instanceof IStyleSheet) {
  86                                 styleSheet = null;
  87                         }
  88                         if (newInput instanceof IStyleSheet) {
  89                                 IStyleSheet newStyleSheet = (IStyleSheet) newInput;
  90                                 styleSheet = newStyleSheet;
  91                         }
  92                 }
  93         }
  94
  95 }