XMLEnvironmentRegistry.java

/**
 * This file Copyright (c) 2005-2008 Aptana, Inc. This program is
 * dual-licensed under both the Aptana Public License and the GNU General
 * Public license. You may elect to use one or the other of these licenses.
 * 
 * This program is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT. Redistribution, except as permitted by whichever of
 * the GPL or APL you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or modify this
 * program under the terms of the GNU General Public License,
 * Version 3, as published by the Free Software Foundation.  You should
 * have received a copy of the GNU General Public License, Version 3 along
 * with this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Aptana provides a special exception to allow redistribution of this file
 * with certain other free and open source software ("FOSS") code and certain additional terms
 * pursuant to Section 7 of the GPL. You may view the exception and these
 * terms on the web at http://www.aptana.com/legal/gpl/.
 * 
 * 2. For the Aptana Public License (APL), this program and the
 * accompanying materials are made available under the terms of the APL
 * v1.0 which accompanies this distribution, and is available at
 * http://www.aptana.com/legal/apl/.
 * 
 * You may view the GPL, Aptana's exception and additional terms, and the
 * APL in the file titled license.html at the root of the corresponding
 * plugin containing this source file.
 * 
 * Any modifications to this file must keep this entire header intact.
 */
package com.aptana.ide.editor.xml;

import java.util.ArrayList;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;

import com.aptana.ide.core.IdeLog;
import com.aptana.ide.lexer.LexemeList;
import com.aptana.ide.metadata.IMetadataEnvironment;
import com.aptana.ide.metadata.MetadataEnvironment;
import com.aptana.ide.metadata.MetadataRuntimeEnvironment;

/**
 * @author Pavel Petrochenko
 */
public final class XMLEnvironmentRegistry
{

	private static XMLEnvironmentRegistry registry;
	ArrayList<IXMLEnvironmentProvider> providers = new ArrayList<IXMLEnvironmentProvider>();

	private XMLEnvironmentRegistry()
	{
		IConfigurationElement[] configurationElementsFor = Platform.getExtensionRegistry().getConfigurationElementsFor(
				"com.aptana.ide.editor.xml.environmentProvider"); //$NON-NLS-1$
		for (IConfigurationElement e : configurationElementsFor)
		{
			try
			{
				providers.add((IXMLEnvironmentProvider) e.createExecutableExtension("class")); //$NON-NLS-1$
			}
			catch (CoreException e1)
			{
				IdeLog.logError(XMLPlugin.getDefault(), "Exception creating environment providers"); //$NON-NLS-1$
			}
		}
	}

	static XMLEnvironmentRegistry getEnvironmentRegistry()
	{
		if (registry == null)
		{
			registry = new XMLEnvironmentRegistry();
		}
		return registry;
	}

	/**
	 * @param ls
	 * @param position
	 * @return environment
	 */
	public static IMetadataEnvironment getEnvironment(LexemeList ls, int position)
	{
		MetadataRuntimeEnvironment rs=new MetadataRuntimeEnvironment();
		XMLEnvironmentRegistry environmentRegistry = getEnvironmentRegistry();
		for (IXMLEnvironmentProvider p : environmentRegistry.providers)
		{
			MetadataEnvironment environment = p.getEnvironment(ls, position);
			if (environment != null)
			{
				rs.addEnvironment(environment);
			}
		}
		return rs;
	}
}