/*

* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.sdt.emf.component.loader;

import com.nokia.sdt.component.symbian.ComponentSystemPlugin;

import com.nokia.sdt.component.symbian.Messages;

import com.nokia.sdt.emf.component.ComponentPackage;

import com.nokia.sdt.emf.component.DocumentRoot;

import com.nokia.sdt.emf.component.util.ComponentResourceFactoryImpl;

import com.nokia.cpp.internal.api.utils.core.Logging;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.emf.common.util.EList;

import org.eclipse.emf.common.util.URI;

import org.eclipse.emf.ecore.EReference;

import org.eclipse.emf.ecore.resource.Resource;

import org.eclipse.emf.ecore.resource.Resource.IOWrappedException;

import org.xml.sax.SAXParseException;

import java.io.IOException;

import java.text.MessageFormat;

/**

 * 

 */

public class Loader {

	/**

	 * Loads a component descriptor document

	 * 

	 * @param xmlURI the file to load

	 * @return the root element, or null if error occurred

	 */

	public DocumentRoot	load(URI xmlURI) {

		ComponentResourceFactoryImpl factory = new ComponentResourceFactoryImpl();

		Resource r = factory.createResource(xmlURI);

		boolean ok = false;

		try {

			// With the move to EMF 2.3, EMF suddenly decided the entries referencing

			// properties are not changeable. I couldn't find any doc on why this 

			// is so or how to override it via schema or EMF tools, but it prevents us 

			// from dynamically adding properties. The code below sets the structural 

			EReference ref = ComponentPackage.eINSTANCE.getPropertiesType_AbstractProperty();

			ref.setChangeable(true);

			r.load(null);

			ok = true;

		}

		catch (IOException x) {

			logError(xmlURI, x);

		}

		catch (RuntimeException x) {

			logError(xmlURI, x);

		}

		DocumentRoot root = null;

		if (ok) {

			EList contents = r.getContents();

			if (contents != null && contents.size() > 0)

			{

				root = (DocumentRoot) contents.get(0);

			}

			r.unload();

		}

		return root;

	}

	private void logError(URI uri, Exception x) {

		ComponentSystemPlugin plugin = ComponentSystemPlugin.getDefault();

        String msg;

        if (x instanceof IOWrappedException && ((IOWrappedException)x).getWrappedException() instanceof SAXParseException) {

            SAXParseException spe = (SAXParseException)((IOWrappedException)x).getWrappedException();

            String tmpl = Messages.getString("Loader.1"); //$NON-NLS-1$

            Object params[] = {uri.toString(),

                    Integer.toString(spe.getLineNumber()),

                    x.getLocalizedMessage()

                     };

            msg = MessageFormat.format(tmpl, params);

        } else {

            String tmpl = Messages.getString("Loader.0"); //$NON-NLS-1$

            Object params[] = {uri.toString(), x.getLocalizedMessage()};

            msg = MessageFormat.format(tmpl, params);

        }

		Logging.log(plugin, Logging.newStatus(plugin,

						IStatus.ERROR, msg, x));

	}

}