/*
 * Copyright 2016 (C) Tom Parker <thpr@users.sourceforge.net>
 * 
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package pcgen.rules.persistence;

import java.net.URI;

import pcgen.cdom.inst.Dynamic;
import pcgen.cdom.inst.DynamicCategory;
import pcgen.persistence.lst.SimpleLoader;
import pcgen.rules.context.LoadContext;
import pcgen.util.Logging;

/**
 * This class is a LstFileLoader that processes the dynamic lst files
 */
public class DynamicLoader extends SimpleLoader<Dynamic>
{

	private static final Class<Dynamic> DYNAMIC_CLASS = Dynamic.class;

	public DynamicLoader()
	{
		super(DYNAMIC_CLASS);
	}

	@Override
	protected Dynamic getLoadable(LoadContext context, String token,
		URI sourceURI)
	{
		final int colonLoc = token.indexOf(':');
		if (colonLoc == -1)
		{
			Logging.errorPrint("Invalid Token - does not contain a colon: '"
				+ token + "' in " + sourceURI);
			return null;
		}
		else if (colonLoc == 0)
		{
			Logging.errorPrint("Invalid Token - starts with a colon: '" + token
				+ "' in " + sourceURI);
			return null;
		}
		else if (colonLoc == (token.length() - 1))
		{
			Logging.errorPrint("Invalid Token - "
				+ "ends with a colon (no value): '" + token + "' in "
				+ sourceURI);
			return null;
		}
		String key = token.substring(0, colonLoc);
		DynamicCategory dynamicCategory =
				context.getReferenceContext().silentlyGetConstructedCDOMObject(
					DynamicCategory.class, key);
		if (dynamicCategory == null)
		{
			Logging.addParseMessage(Logging.LST_ERROR,
				"Unsure what to do with line with prefix "
					+ "(no DYNAMICSCOPE of this type was defined): " + key
					+ ".  Line started with: " + token + " in file: "
					+ sourceURI);
			return null;
		}
		String name = token.substring(colonLoc + 1);
		if ((name == null) || (name.isEmpty()))
		{
			Logging.errorPrint("Invalid Token '" + key + "' had no value in "
				+ sourceURI);
			return null;
		}
		//Only load once / allow duplicates in different files
		Dynamic d =
				context.getReferenceContext().silentlyGetConstructedCDOMObject(
					DYNAMIC_CLASS, dynamicCategory, name);
		if (d == null)
		{
			d = new Dynamic();
			d.setName(name);
			d.setCDOMCategory(dynamicCategory);
			d.setSourceURI(sourceURI);
			context.getReferenceContext().importObject(d);
		}
		return d;
	}

}