/*******************************************************************************
 * Copyright (c) 2001, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.wsdl.ui.internal.outline;

import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.graphics.Image;
import org.eclipse.wst.wsdl.ui.internal.WSDLEditor;
import org.eclipse.wst.wsdl.ui.internal.WSDLEditorPlugin;
import org.eclipse.wst.wsdl.ui.internal.extension.WSDLEditorExtension;
import org.eclipse.wst.wsdl.ui.internal.extension.WSDLEditorExtensionRegistry;


public class ExtensibleOutlineProvider implements ITreeContentProvider, ILabelProvider
{
  protected WSDLEditorExtension[] treeContentProviderExtensions;
  protected ITreeContentProvider[] treeContentProviders;

  protected WSDLEditorExtension[] labelProviderExtensions;
  protected ILabelProvider[] labelProviders;

  protected final static Object[] EMPTY_ARRAY = {};

  public ExtensibleOutlineProvider(WSDLEditor wsdlEditor)
  {
    WSDLEditorExtensionRegistry registry = WSDLEditorPlugin.getInstance().getWSDLEditorExtensionRegistry(); 

    treeContentProviderExtensions = registry.getRegisteredExtensions(WSDLEditorExtension.OUTLINE_TREE_CONTENT_PROVIDER); 
    treeContentProviders = new ITreeContentProvider[treeContentProviderExtensions.length]; 
    for (int i = 0; i < treeContentProviderExtensions.length; i++)
    {
      treeContentProviders[i] = (ITreeContentProvider)treeContentProviderExtensions[i].createExtensionObject(WSDLEditorExtension.OUTLINE_TREE_CONTENT_PROVIDER, wsdlEditor);
    }

    labelProviderExtensions = registry.getRegisteredExtensions(WSDLEditorExtension.OUTLINE_LABEL_PROVIDER); 
    labelProviders = new ILabelProvider[labelProviderExtensions.length]; 
    for (int i = 0; i < labelProviderExtensions.length; i++)
    {
      labelProviders[i] = (ILabelProvider)labelProviderExtensions[i].createExtensionObject(WSDLEditorExtension.OUTLINE_LABEL_PROVIDER, wsdlEditor);
    }
  }
      
                   
  protected ITreeContentProvider getApplicableTreeContentProvider(Object object)
  {                             
    ITreeContentProvider provider = null;
    for (int i = 0; i < treeContentProviderExtensions.length; i++)
    {
      if (treeContentProviderExtensions[i].isApplicable(object))
      {
        provider = treeContentProviders[i];
        if (provider != null)
        {
          break;
        }
      }
    }
    return provider;
  }


  protected ILabelProvider getApplicableLabelProvider(Object object)
  {
    ILabelProvider provider = null;
    for (int i = 0; i < labelProviderExtensions.length; i++)
    {
      if (labelProviderExtensions[i].isApplicable(object))
      {
        provider = labelProviders[i];
        if (provider != null)
        {
          break;
        }
      }
    }
    return provider;
  }

  // implements ITreeContentProvider
  //
  public Object[] getChildren(Object parentElement) 
  { 
    ITreeContentProvider provider = getApplicableTreeContentProvider(parentElement);
    //System.out.println("getElements " + provider);
    return provider != null ? provider.getChildren(parentElement) : EMPTY_ARRAY;
  }

  public Object getParent(Object element)
  {
    ITreeContentProvider provider = getApplicableTreeContentProvider(element);
    return provider != null ? provider.getParent(element) : null;
  }

  public boolean hasChildren(Object element)
  {
    ITreeContentProvider provider = getApplicableTreeContentProvider(element);
    return provider != null ? provider.hasChildren(element) : false;
  }

  public Object[] getElements(Object inputElement)  
  {                                            
    ITreeContentProvider provider = getApplicableTreeContentProvider(inputElement);
    //System.out.println("getElements " + provider);
    return provider != null ? provider.getElements(inputElement) : EMPTY_ARRAY;
  }

  public void dispose()  
  {
    // TODO... call dispose dispose the created label and content providers
  }

  public void inputChanged(Viewer viewer, Object oldInput, Object newInput)
  {
    for (int i = 0; i < treeContentProviders.length; i++)
    {
      treeContentProviders[i].inputChanged(viewer, oldInput, newInput);
    }
  }                 

  // implements ILabelProvider  
  //
  public Image getImage(Object element) 
  { 
    ILabelProvider provider = getApplicableLabelProvider(element);
    return provider != null ? provider.getImage(element) : null;
  }

  public String getText(Object element)  
  {            
    String result = null;       
    if (element != null)
    {
      ILabelProvider provider = getApplicableLabelProvider(element);
      result = provider != null ? provider.getText(element) : (element.toString() + "noProviderForClass=" + element.getClass().getName());
    }
    return result != null ? result : "";
  }   

  public void addListener(ILabelProviderListener listener) 
  {
  }

  public void removeListener(ILabelProviderListener listener)
  {
  }

  public boolean isLabelProperty(Object element, String property) 
  {              
    return false;
  }
}