/*
 * Copyright (c) 2012, 2013, Credit Suisse (Anatole Tresch), Werner Keil.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.javamoney.regions.internal;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import javax.inject.Singleton;
import javax.money.spi.Bootstrap;

import org.javamoney.regions.Region;
import org.javamoney.regions.spi.ExtendedRegionDataProviderSpi;
import org.javamoney.regions.spi.RegionsSingletonSpi;

/**
 * This class models the an internal service class, that provides the base
 * method used by the {@link RegionsSingletonSpi} implementation. It is extended
 * for different runtime scenarios, hereby allowing the spi implementation
 * loaded using different mechanisms.
 * 
 * @author Anatole Tresch
 * @author Werner Keil
 */
@Singleton
public class DefaultExtendedRegionDataProvider implements ExtendedRegionDataProviderSpi{

	public Collection<Class> getExtendedRegionDataTypes(Region region) {
		Set<Class> dataTypes = new HashSet<Class>();
		for (ExtendedRegionDataProviderSpi prov : Bootstrap
				.getServices(ExtendedRegionDataProviderSpi.class)) {
			dataTypes.addAll(prov.getExtendedRegionDataTypes(region));
		}
		return dataTypes;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.money.ext.Region#getRegionData(java.lang.Class)
	 */
	public <T> T getExtendedRegionData(Region region, Class<T> type) {
		for (ExtendedRegionDataProviderSpi prov : Bootstrap
				.getServices(ExtendedRegionDataProviderSpi.class)) {
			if (prov.getExtendedRegionDataTypes(region).contains(type)) {
				T data = (T) prov.getExtendedRegionData(region, type);
				if (data != null) {
					return data;
				}
			}
		}
		throw new IllegalArgumentException("Unsupported data type for " + this
				+ ", use one of " + getExtendedRegionDataTypes(region));
	}

}