package com.facebook.presto.hive.shaded.org.codehaus.jackson.map.util;
import com.facebook.presto.hive.shaded.org.codehaus.jackson.io.SerializedString;
import com.facebook.presto.hive.shaded.org.codehaus.jackson.map.AnnotationIntrospector;
import com.facebook.presto.hive.shaded.org.codehaus.jackson.map.MapperConfig;
import com.facebook.presto.hive.shaded.org.codehaus.jackson.map.introspect.AnnotatedClass;
import com.facebook.presto.hive.shaded.org.codehaus.jackson.map.introspect.BasicBeanDescription;
import com.facebook.presto.hive.shaded.org.codehaus.jackson.map.type.ClassKey;
import com.facebook.presto.hive.shaded.org.codehaus.jackson.type.JavaType;
/**
* Helper class for caching resolved root names.
*/
public class RootNameLookup
{
/**
* For efficient operation, let's try to minimize number of times we
* need to introspect root element name to use.
*/
protected LRUMap<ClassKey,SerializedString> _rootNames;
public RootNameLookup() { }
public SerializedString findRootName(JavaType rootType, MapperConfig<?> config)
{
return findRootName(rootType.getRawClass(), config);
}
public synchronized SerializedString findRootName(Class<?> rootType, MapperConfig<?> config)
{
ClassKey key = new ClassKey(rootType);
if (_rootNames == null) {
_rootNames = new LRUMap<ClassKey,SerializedString>(20, 200);
} else {
SerializedString name = _rootNames.get(key);
if (name != null) {
return name;
}
}
BasicBeanDescription beanDesc = (BasicBeanDescription) config.introspectClassAnnotations(rootType);
AnnotationIntrospector intr = config.getAnnotationIntrospector();
AnnotatedClass ac = beanDesc.getClassInfo();
String nameStr = intr.findRootName(ac);
// No answer so far? Let's just default to using simple class name
if (nameStr == null) {
// Should we strip out enclosing class tho? For now, nope:
nameStr = rootType.getSimpleName();
}
SerializedString name = new SerializedString(nameStr);
_rootNames.put(key, name);
return name;
}
}