package org.jdbi.v3.core.collector;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.HashSet;
import java.util.IdentityHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.stream.Collector;
import static java.util.stream.Collectors.toCollection;
import static java.util.stream.Collectors.toSet;
import static org.jdbi.v3.core.generic.GenericTypes.findGenericParameter;
import static org.jdbi.v3.core.generic.GenericTypes.getErasedType;
class SetCollectorFactory implements CollectorFactory {
private final Map<Class<?>, Collector<?, ?, ?>> collectors = new IdentityHashMap<>();
SetCollectorFactory() {
collectors.put(Set.class, toSet());
collectors.put(HashSet.class, toCollection(HashSet::new));
collectors.put(LinkedHashSet.class, toCollection(LinkedHashSet::new));
collectors.put(SortedSet.class, toCollection(TreeSet::new));
collectors.put(TreeSet.class, toCollection(TreeSet::new));
}
@Override
public boolean accepts(Type containerType) {
return containerType instanceof ParameterizedType && collectors.containsKey(getErasedType(containerType));
}
@Override
public Optional<Type> elementType(Type containerType) {
Class<?> erasedType = getErasedType(containerType);
return findGenericParameter(containerType, erasedType);
}
@Override
public Collector<?, ?, ?> build(Type containerType) {
Class<?> erasedType = getErasedType(containerType);
return collectors.get(erasedType);
}
}