/*******************************************************************************
 * Copyright (c) 2007 Exadel, Inc. and Red Hat, Inc.
 * Distributed under license by Red Hat, Inc. All rights reserved.
 * This program is 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:
 *     Exadel, Inc. and Red Hat, Inc. - initial API and implementation
 ******************************************************************************/ 
package org.jboss.tools.jst.web.project.list;

import java.util.*;

import org.eclipse.core.runtime.Platform;
import org.jboss.tools.common.model.XModel;
import org.jboss.tools.common.model.util.ModelFeatureFactory;
import org.jboss.tools.jst.web.WebModelPlugin;

public class WebPromptingProvider implements IWebPromptingProvider {
	
	static IWebPromptingProvider[] providers;
	
	static {
		String[][] pns = new String[][]{
			{"org.jboss.tools.jsf.model.pv.JSFPromptingProvider", "org.jboss.tools.jsf"}, //$NON-NLS-1$ //$NON-NLS-2$
			{"org.jboss.tools.struts.model.pv.StrutsPromptingProvider", "org.jboss.tools.struts"}, //$NON-NLS-1$ //$NON-NLS-2$
			{"org.jboss.tools.seam.xml.components.model.SeamPromptingProvider", "org.jboss.tools.seam.xml"} //$NON-NLS-1$ //$NON-NLS-2$
		};
		List<IWebPromptingProvider> l = new ArrayList<IWebPromptingProvider>();
		for (int i = 0; i < pns.length; i++) {
			String bundleName = pns[i][1];
			if(Platform.getBundle(bundleName) == null) continue;
			try {
				IWebPromptingProvider p = (IWebPromptingProvider)ModelFeatureFactory.getInstance().createFeatureInstance(pns[i][0]);
				if(p != null) l.add(p);
			} catch (ClassCastException e) {
				WebModelPlugin.getPluginLog().logError(e);
			}
		}
		providers = l.toArray(new IWebPromptingProvider[0]);
	}
	
	public static WebPromptingProvider getInstance() {
		return WebPromptingProviderHolder.provider;
	}
	
	public boolean isSupporting(String id) {
		for (int i = 0; i < providers.length; i++) {
			if(providers[i].isSupporting(id)) return true;
		}
		return false;
	}

	public List<Object> getList(XModel model, String id, String prefix, Properties properties) {
		String error = null;
		for (int i = 0; i < providers.length; i++) {
			if(providers[i].isSupporting(id)) {
				List<Object> result = providers[i].getList(model, id, prefix, properties);
				String err = properties == null ? null : (String)properties.remove(ERROR);
				if(err == null) {
					return result;
				} else if(error == null) {
					error = err;
				}
			}
		}
		if(properties != null && error != null) {
			properties.setProperty(ERROR, error);
		}
		return EMPTY_LIST;
	}
	
	static class WebPromptingProviderHolder {
		static WebPromptingProvider provider = new WebPromptingProvider();
	}

}
