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Add a helper for casting some common collection types into generic form

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Christian 2014-05-10 13:36:24 -04:00
parent 123f5919ba
commit 0a9099c8dd
1 changed files with 32 additions and 0 deletions
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fml/src/main/java/cpw/mods/fml/common/functions/CollectionWrapperFactory.java Normal file
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package cpw.mods.fml.common.functions;
import java.util.Collection;
import java.util.List;
import com.google.common.collect.Collections2;
import com.google.common.collect.Lists;
public class CollectionWrapperFactory {
/**
* Return a read only cast view of the supplied ungeneric collection, based on the element type given
* @param coll The collection to cast
* @param elementType the supertype contained in the collection
* @return a collection asserting that type relationship
*/
public static <T> Collection<T> wrap(@SuppressWarnings("rawtypes") Collection coll, Class<T> elementType)
{
Collection<?> asGeneric = coll;
return Collections2.transform(asGeneric, new TypeCastFunction<T>(elementType));
}
/**
* Return a read only cast view of the supplied ungeneric list, based on the element type given
* @param list The list to cast
* @param elementType the supertype contained in the list
* @return a list asserting that type relationship
*/
public static <T> List<T> wrap(@SuppressWarnings("rawtypes") List list, Class<T> elementType)
{
List<?> asGeneric = list;
return Lists.transform(asGeneric, new TypeCastFunction<T>(elementType));
}
}