org.infinispan.util.SetMapper Maven / Gradle / Ivy
package org.infinispan.util;
import java.util.Collection;
import java.util.Set;
import java.util.function.Function;
import org.infinispan.commons.util.InjectiveFunction;
/**
* A set that maps another one to a new one of a possibly different type. Note this set is read only
* and doesn't accept write operations.
*
* This class currently only accepts a {@link Function} that also implements {@link InjectiveFunction} so that it can
* guarantee the resulting mapped values are distinct from each other. This is important as many operations because
* very costly if this is not true.
*
* Some operations such as {@link Collection#contains(Object)} and {@link Collection#containsAll(Collection)} may be
* more expensive then normal since they cannot utilize lookups into the original collection.
* @author wburns
* @since 9.0
*/
public class SetMapper extends CollectionMapper implements Set {
public SetMapper(Set realCollection, Function mapper) {
super(realCollection, mapper);
if (!(mapper instanceof InjectiveFunction)) {
throw new IllegalArgumentException("Function must also provided distinct values as evidented by implementing" +
"the marker interface InjectiveFunction");
}
}
}