CollectionPropertyType.java

package com.buschmais.xo.impl.proxy.entity.property;

import java.util.Collection;

import com.buschmais.xo.api.XOException;

/**
 * Defines the collection types supported for properties.
 */
public enum CollectionPropertyType {

	List(java.util.List.class), Set(java.util.Set.class), Collection(java.util.Collection.class);

	private Class<? extends Collection> collectionType;

	/**
	 * Constructor.
	 * 
	 * @param type
	 *            The collection type (i.e. interface).
	 */
	private CollectionPropertyType(Class<? extends java.util.Collection> type) {
		this.collectionType = type;
	}

	/**
	 * Return the Java collection type.
	 * 
	 * @return The Java collection type.
	 */
	public Class<? extends Collection> getCollectionType() {
		return collectionType;
	}

	/**
	 * Determine the
	 * {@link com.buschmais.xo.impl.proxy.entity.property.CollectionPropertyType}
	 * for a given class.
	 * 
	 * @param type
	 *            The class.
	 * @return The collection property type.
	 */
	public static CollectionPropertyType getCollectionPropertyType(Class<?> type) {
		for (CollectionPropertyType collectionPropertyType : CollectionPropertyType.values()) {
			if (collectionPropertyType.collectionType.isAssignableFrom(type)) {
				return collectionPropertyType;
			}
		}
		throw new XOException(type.getName() + "is not a supported collection type.");
	}

}