/*******************************************************************************
 * Copyright (c) 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.jsdt.web.core.internal.document;

import org.eclipse.wst.sse.core.internal.provisional.INodeNotifier;
import org.eclipse.wst.sse.core.internal.provisional.IndexedRegion;
import org.eclipse.wst.xml.core.internal.document.AttrImpl;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMDocument;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMElement;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMNode;

/**
 * The responsibility of this class is to monitor page directives and if a
 * change in embedded type is is made, it will signal the structuredModel that
 * it needs to reinitialize itself.
 */
class PageDirectiveWatcherImpl implements PageDirectiveWatcher {

	private static Object adapterType = PageDirectiveWatcher.class;
	IDOMElement targetElement;

	/**
	 * Constructor for PageDirectiveWatcherImpl.
	 */
	public PageDirectiveWatcherImpl(IDOMElement target) {
		super();
		targetElement = target;
		String contentTypeValue = target.getAttribute("contentType"); //$NON-NLS-1$
		if (contentTypeValue != null) {
			// using concrete class below, since "changed" is something of an
			// internal method
			PageDirectiveAdapterImpl pageDirectiveAdapter = (PageDirectiveAdapterImpl) ((IDOMDocument) targetElement
					.getOwnerDocument())
					.getAdapterFor(PageDirectiveAdapter.class);
			pageDirectiveAdapter.changedContentType(
					((IndexedRegion) targetElement).getStartOffset(),
					contentTypeValue);
		}
		String languageValue = target.getAttribute("language"); //$NON-NLS-1$
		if (languageValue != null) {
			// using concrete class below, since "changed" is something of an
			// internal method
			PageDirectiveAdapterImpl pageDirectiveAdapter = (PageDirectiveAdapterImpl) ((IDOMDocument) targetElement
					.getOwnerDocument())
					.getAdapterFor(PageDirectiveAdapter.class);
			pageDirectiveAdapter.changedLanguage(
					((IndexedRegion) targetElement).getStartOffset(),
					languageValue);
		}

	}

	public boolean isAdapterForType(Object type) {
		return (type == adapterType);
	}

	public void notifyChanged(INodeNotifier notifier, int eventType,
			Object changedFeature, Object oldValue, Object newValue, int pos) {
		// we should only be added to page directives, so if we see a page
		// directive
		// change, we need to check its attributes, and notify the
		// PageDirectiveAdapter when
		// certain ones chane, so it can make its "centralized" decisions.
		if (notifier instanceof IDOMNode) {

			switch (eventType) {
			case INodeNotifier.CHANGE:
				if (changedFeature instanceof AttrImpl) {
					AttrImpl attribute = (AttrImpl) changedFeature;
					String name = attribute.getName();
					if (name.equals("contentType")) { //$NON-NLS-1$
						// using concrete class below, since "changed" is
						// something of an internal method
						PageDirectiveAdapterImpl pageDirectiveAdapter = (PageDirectiveAdapterImpl) ((IDOMDocument) targetElement
								.getOwnerDocument())
								.getAdapterFor(PageDirectiveAdapter.class);
						pageDirectiveAdapter.changedContentType(
								((IndexedRegion) targetElement)
										.getStartOffset(), (String) newValue);
					}
					if (name.equals("language")) { //$NON-NLS-1$ 
						// using concrete class below, since "changed" is
						// something of an internal method
						PageDirectiveAdapterImpl pageDirectiveAdapter = (PageDirectiveAdapterImpl) ((IDOMDocument) targetElement
								.getOwnerDocument())
								.getAdapterFor(PageDirectiveAdapter.class);
						pageDirectiveAdapter.changedLanguage(
								((IndexedRegion) targetElement)
										.getStartOffset(), (String) newValue);
					}
				}

				break;
			case INodeNotifier.REMOVE:
				// System.out.println("removed"+new Date().toString());
				break;

			default:
				break;
			}
		}

	}

	public String getContentType() {
		String contentTypeValue = targetElement.getAttribute("contentType"); //$NON-NLS-1$
		return contentTypeValue;
	}

	public String getLanguage() {
		String languageValue = targetElement.getAttribute("language"); //$NON-NLS-1$
		return languageValue;
	}

	public int getOffset() {
		return targetElement.getStartOffset();
	}

}