| /********************************************************************** |
| * Copyright (c) 2003, 2004 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM - Initial API and implementation |
| **********************************************************************/ |
| package org.eclipse.wst.server.ui.internal.viewers; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.eclipse.jface.viewers.ITreeContentProvider; |
| import org.eclipse.jface.viewers.Viewer; |
| /** |
| * Runtime type content provider. |
| */ |
| public abstract class AbstractTreeContentProvider implements ITreeContentProvider { |
| public static final byte STYLE_FLAT = 0; |
| |
| public static final String ROOT = "root"; |
| |
| protected byte style; |
| |
| protected Object initialSelection; |
| protected int initialSelectionOrder; |
| |
| public class TreeElement { |
| String text; |
| List contents; |
| } |
| |
| protected Object[] elements; |
| protected Map elementToParentMap = new HashMap(2); |
| protected Map textMap = new HashMap(2); |
| |
| /** |
| * AbstractTreeContentProvider constructor comment. |
| */ |
| public AbstractTreeContentProvider(byte style) { |
| super(); |
| this.style = style; |
| |
| fillTree(); |
| } |
| |
| public AbstractTreeContentProvider(byte style, boolean init) { |
| super(); |
| this.style = style; |
| } |
| |
| protected abstract void fillTree(); |
| |
| protected void clean() { |
| elements = null; |
| elementToParentMap = new HashMap(2); |
| textMap = new HashMap(2); |
| |
| initialSelection = null; |
| initialSelectionOrder = -1000; |
| } |
| |
| protected TreeElement getOrCreate(List list, String text) { |
| try { |
| Object obj = textMap.get(text); |
| if (obj != null) |
| return (TreeElement) obj; |
| } catch (Exception e) { |
| return null; |
| } |
| |
| TreeElement element = new TreeElement(); |
| element.text = text; |
| element.contents = new ArrayList(); |
| textMap.put(text, element); |
| list.add(element); |
| return element; |
| } |
| |
| protected TreeElement getOrCreate(List list, String id, String text) { |
| try { |
| Object obj = textMap.get(id); |
| if (obj != null) |
| return (TreeElement) obj; |
| } catch (Exception e) { |
| return null; |
| } |
| |
| TreeElement element = new TreeElement(); |
| element.text = text; |
| element.contents = new ArrayList(); |
| textMap.put(id, element); |
| list.add(element); |
| return element; |
| } |
| |
| protected TreeElement getByText(String text) { |
| try { |
| return (TreeElement) textMap.get(text); |
| } catch (Exception e) { |
| return null; |
| } |
| } |
| |
| protected TreeElement getParentImpl(Object obj) { |
| try { |
| return (TreeElement) elementToParentMap.get(obj); |
| } catch (Exception e) { |
| return null; |
| } |
| } |
| |
| /** |
| * Disposes of this content provider. |
| * This is called by the viewer when it is disposed. |
| */ |
| public void dispose() { |
| // do nothing |
| } |
| |
| /** |
| * Returns the elements to display in the viewer |
| * when its input is set to the given element. |
| * These elements can be presented as rows in a table, items in a list, etc. |
| * The result is not modified by the viewer. |
| * |
| * @param inputElement the input element |
| * @return the array of elements to display in the viewer |
| */ |
| public Object[] getElements(Object element) { |
| return elements; |
| } |
| |
| public Object[] getChildren(Object element) { |
| if (style == STYLE_FLAT) |
| return null; |
| else if (!(element instanceof TreeElement)) |
| return null; |
| |
| TreeElement rte = (TreeElement) element; |
| return rte.contents.toArray(); |
| } |
| |
| public Object getParent(Object element) { |
| if (style == STYLE_FLAT) |
| return null; |
| //else if (element instanceof TreeElement) |
| // return null; |
| |
| return getParentImpl(element); |
| } |
| |
| public boolean hasChildren(Object element) { |
| if (style == STYLE_FLAT) |
| return false; |
| //else if (!(element instanceof TreeElement)) |
| // return false; |
| Object[] children = getChildren(element); |
| return children != null && children.length > 0; |
| |
| //return true; |
| } |
| |
| /** |
| * Notifies this content provider that the given viewer's input |
| * has been switched to a different element. |
| * <p> |
| * A typical use for this method is registering the content provider as a listener |
| * to changes on the new input (using model-specific means), and deregistering the viewer |
| * from the old input. In response to these change notifications, the content provider |
| * propagates the changes to the viewer. |
| * </p> |
| * |
| * @param viewer the viewer |
| * @param oldInput the old input element, or <code>null</code> if the viewer |
| * did not previously have an input |
| * @param newInput the new input element, or <code>null</code> if the viewer |
| * does not have an input |
| */ |
| public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { |
| // do nothing |
| } |
| |
| public Object getInitialSelection() { |
| return initialSelection; |
| } |
| } |