Package org.eclipse.wst.xml.core.internal.propagate

Source Code of org.eclipse.wst.xml.core.internal.propagate.PropagatingAdapterImpl

/*******************************************************************************
* Copyright (c) 2001, 2005 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
*     Jens Lukowski/Innoopract - initial renaming/restructuring
*    
*******************************************************************************/
package org.eclipse.wst.xml.core.internal.propagate;



import java.util.ArrayList;
import java.util.List;

import org.eclipse.wst.sse.core.internal.PropagatingAdapter;
import org.eclipse.wst.sse.core.internal.provisional.INodeAdapterFactory;
import org.eclipse.wst.sse.core.internal.provisional.INodeNotifier;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMNode;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.Node;


public class PropagatingAdapterImpl implements PropagatingAdapter {

  private List adaptOnCreateFactories = null;

  /**
   * AbstractPropagatingAdapterImpl constructor comment.
   */
  public PropagatingAdapterImpl() {
    super();
  }

  private void adaptOnCreate(IDOMNode node) {
    // give each of the factories a chance to adapt the node, if it
    // chooses to
    if (adaptOnCreateFactories != null) {


      synchronized (adaptOnCreateFactories) {
        int length = adaptOnCreateFactories.size();
        for (int i = 0; i < length; i++) {
          INodeAdapterFactory factory = (INodeAdapterFactory) adaptOnCreateFactories.get(i);
          factory.adapt(node);
        }
      }

    }

  }

  /**
   * This mechanism can be made "easier to use" later.
   */
  public void addAdaptOnCreateFactory(INodeAdapterFactory factory) {
    getAdaptOnCreateFactories().add(factory);
  }

  /**
   * Gets the adaptOnCreateFactories.
   *
   * @return Returns a List
   */
  public List getAdaptOnCreateFactories() {
    if (adaptOnCreateFactories == null)
      adaptOnCreateFactories = new ArrayList();
    return adaptOnCreateFactories;
  }


  /**
   * @see PropagatingAdapter#initializeForFactory(INodeAdapterFactory,
   *      INodeNotifier)
   */
  public void initializeForFactory(INodeAdapterFactory factory, INodeNotifier node) {
    // ISSUE: we are a DOM specific implimentation,
    // we should not be.
    if (node instanceof IDOMNode) {
      IDOMNode xmlNode = (IDOMNode) node;
      propagateTo(xmlNode);
    }
  }

  /**
   * Allowing the INodeAdapter to compare itself against the type allows it
   * to return true in more than one case.
   */
  public boolean isAdapterForType(Object type) {
    return type.equals(PropagatingAdapter.class);
  }

  private boolean isInteresting(Object newValue) {
    return (newValue != null && (newValue instanceof Element || newValue instanceof Document || newValue instanceof DocumentType));
  }

  /**
   */
  public void notifyChanged(INodeNotifier notifier, int eventType, Object changedFeature, Object oldValue, Object newValue, int pos) {
    // Issue: We only propagate to Elements ...
    // not attributes too! We should careful consider doning all when
    // when we improve "adapt on create" design.
    if (eventType == INodeNotifier.ADD && isInteresting(newValue)) {
      propagateTo((IDOMNode) newValue);
    }
  }

  private void propagateTo(IDOMNode node) {
    // get adapter to ensure its created
    node.getAdapterFor(PropagatingAdapter.class);
    adaptOnCreate(node);
    propagateToChildren(node);
  }

  private void propagateToChildren(IDOMNode parent) {
    for (Node child = parent.getFirstChild(); child != null; child = child.getNextSibling()) {
      propagateTo((IDOMNode) child);
    }
  }

  /**
   * @see PropagatingAdapter#release()
   */
  public void release() {
    if (adaptOnCreateFactories != null) {

      synchronized (adaptOnCreateFactories) {
        int length = adaptOnCreateFactories.size();
        for (int i = 0; i < length; i++) {
          INodeAdapterFactory factory = (INodeAdapterFactory) adaptOnCreateFactories.get(i);
          factory.release();
        }
      }

    }
  }

}
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