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/*******************************************************************************
 * Copyright (c) 2008 Obeo.
 * 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:
 *     Jerome Benois (Obeo) jerome.benois@obeo.fr - initial API and implementation
 *     Tristan Faure (Atos Origin) tristan.faure@atosorigin.com - add condition to the create command (task #296902)
 *******************************************************************************/
package org.eclipse.papyrus.commands;

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.papyrus.infra.core.extension.BadNameExtensionException;
import org.eclipse.papyrus.infra.core.extension.ExtensionException;
import org.eclipse.papyrus.infra.core.extension.ExtensionUtils;
import org.eclipse.papyrus.infra.core.extension.commands.ICreationCondition;
import org.eclipse.ui.plugin.AbstractUIPlugin;

/**
 * A factory used to create CreationCommand object from Eclipse extensions
 * points elements.
 *
 * @author <a href="mailto:jerome.benois@obeo.fr">Jerome Benois</a>
 */
public class CreationCommandExtensionFactory extends ExtensionUtils {

	/** singleton eINSTANCE of this class */
	public final static CreationCommandExtensionFactory eINSTANCE = new CreationCommandExtensionFactory();

	/** constant for the creation command **/
	public final static String CREATION_COMMAND_EXTENSIONPOINT = "creationCommand";

	/** constant for the attribute creationCommandClass **/
	public final static String CREATION_COMMAND_CLASS_ATTR = "creationCommandClass";

	/** constant for the attribute creationCommandClass **/
	public final static String CONDITION_COMMAND_CLASS_ATTR = "creationCondition";

	/** constant for the attribute label **/
	public final static String LABEL_ATTR = "label";

	/** constant for the attribute contextId **/
	public final static String ID_ATTRIBUTE = "id";

	/** constant for the attribute icon **/
	public final static String ICON_ATTR = "icon";

	/** constant for the attribute language **/
	public final static String LANGUAGE_ATTR = "language";

	/**
	 * @return the eINSTANCE
	 */
	public static CreationCommandExtensionFactory getInstance() {
		return eINSTANCE;
	}

	/**
	 * Create a CreationCommand instance corresponding to the
	 * ConfigurationElement.
	 *
	 * @param element
	 *            an {@link IConfigurationElement} see eclipse extension point
	 * @return a CreationCommandDescriptor structure that contains information
	 *         to the creation diagram command
	 * @throws BadNameExtensionException
	 **/
	public CreationCommandDescriptor createCreationCommand(IConfigurationElement element) throws ExtensionException {
		CreationCommandDescriptor res;
		checkTagName(element, CREATION_COMMAND_EXTENSIONPOINT);
		res = new CreationCommandDescriptor();
		res.creationCommandClass = (Class<ICreationCommand>) parseClass(element, CREATION_COMMAND_CLASS_ATTR, CREATION_COMMAND_EXTENSIONPOINT);
		res.commandId = element.getAttribute(ID_ATTRIBUTE);
		res.label = element.getAttribute(LABEL_ATTR);
		res.language = element.getAttribute(LANGUAGE_ATTR);
		String iconPath = element.getAttribute(ICON_ATTR);
		if (iconPath != null) {
			res.icon = AbstractUIPlugin.imageDescriptorFromPlugin(element.getNamespaceIdentifier(), iconPath);
		}
		String attributeForCreationCondition = element.getAttribute(CONDITION_COMMAND_CLASS_ATTR);
		if (attributeForCreationCondition != null && attributeForCreationCondition.length() > 0) {
			Class<ICreationCondition> classCondition = (Class<ICreationCondition>) parseClass(element, CONDITION_COMMAND_CLASS_ATTR, CREATION_COMMAND_EXTENSIONPOINT);
			if (classCondition != null) {
				try {
					res.setCondition(classCondition.newInstance());
				} catch (InstantiationException e) {
					throw new ExtensionException("can nott instantiate class : " + e.getMessage());
				} catch (IllegalAccessException e) {
					throw new ExtensionException("can nott acces to class : " + e.getMessage());
				}
			}
		}
		Activator.log.debug("a creation command ready " + res);
		return res;
	}

}

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