package org.jdbi.v3.core.collector;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Optional;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.stream.Collector;
import org.jdbi.v3.core.generic.GenericTypes;
import static org.jdbi.v3.core.collector.MapCollectors.toMap;
import static org.jdbi.v3.core.generic.GenericTypes.getErasedType;
class MapCollectorFactory implements CollectorFactory {
private final Map<Class<?>, Collector<?, ?, ?>> collectors = new IdentityHashMap<>();
MapCollectorFactory() {
collectors.put(Map.class, toMap(LinkedHashMap::new));
collectors.put(HashMap.class, toMap(HashMap::new));
collectors.put(LinkedHashMap.class, toMap(LinkedHashMap::new));
collectors.put(SortedMap.class, toMap(TreeMap::new));
collectors.put(TreeMap.class, toMap(TreeMap::new));
collectors.put(ConcurrentMap.class, toMap(ConcurrentHashMap::new));
collectors.put(ConcurrentHashMap.class, toMap(ConcurrentHashMap::new));
collectors.put(WeakHashMap.class, toMap(WeakHashMap::new));
}
@Override
public boolean accepts(Type containerType) {
Class<?> erasedType = getErasedType(containerType);
return containerType instanceof ParameterizedType && collectors.containsKey(erasedType);
}
@Override
public Optional<Type> elementType(Type containerType) {
Class<?> erasedType = getErasedType(containerType);
return Map.class.isAssignableFrom(erasedType)
? Optional.of(GenericTypes.resolveMapEntryType(containerType))
: Optional.empty();
}
@Override
public Collector<?, ?, ?> build(Type containerType) {
Class<?> erasedType = getErasedType(containerType);
return collectors.get(erasedType);
}
}