package com.facebook.presto.jdbc.internal.jackson.databind.util;
import com.facebook.presto.jdbc.internal.jackson.databind.*;
import com.facebook.presto.jdbc.internal.jackson.databind.cfg.MapperConfig;
import com.facebook.presto.jdbc.internal.jackson.databind.introspect.AnnotatedClass;
import com.facebook.presto.jdbc.internal.jackson.databind.type.ClassKey;
/**
* Helper class for caching resolved root names.
*/
public class RootNameLookup implements java.io.Serializable
{
private static final long serialVersionUID = 1L;
/**
* For efficient operation, let's try to minimize number of times we
* need to introspect root element name to use.
*/
protected transient LRUMap<ClassKey,PropertyName> _rootNames;
public RootNameLookup() {
_rootNames = new LRUMap<ClassKey,PropertyName>(20, 200);
}
public PropertyName findRootName(JavaType rootType, MapperConfig<?> config) {
return findRootName(rootType.getRawClass(), config);
}
public PropertyName findRootName(Class<?> rootType, MapperConfig<?> config)
{
ClassKey key = new ClassKey(rootType);
PropertyName name = _rootNames.get(key);
if (name != null) {
return name;
}
BeanDescription beanDesc = config.introspectClassAnnotations(rootType);
AnnotationIntrospector intr = config.getAnnotationIntrospector();
AnnotatedClass ac = beanDesc.getClassInfo();
name = intr.findRootName(ac);
// No answer so far? Let's just default to using simple class name
if (name == null || !name.hasSimpleName()) {
// Should we strip out enclosing class tho? For now, nope:
name = new PropertyName(rootType.getSimpleName());
}
_rootNames.put(key, name);
return name;
}
/*
/**********************************************************
/* Serializable overrides
/**********************************************************
*/
/**
* Need to override to reproduce cache object via constructor, instead
* of serialize/deserialize (since we do NOT want to retain cached data)
*/
protected Object readResolve() {
return new RootNameLookup();
}
}