package org.sql2o.reflection;
import org.sql2o.Sql2oException;
import sun.misc.Unsafe;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
/**
* @author mdelapenya
*/
@SuppressWarnings("Unsafe")
public class UnsafeFieldGetterFactory implements FieldGetterFactory, ObjectConstructorFactory {
private final static Unsafe theUnsafe;
static {
try {
Class unsafeClass = Class.forName("sun.misc.Unsafe");
Field declaredField = unsafeClass.getDeclaredField("theUnsafe");
declaredField.setAccessible(true);
theUnsafe = (Unsafe) declaredField.get(null);
} catch (Throwable e) {
throw new RuntimeException(e);
}
}
public Getter newGetter(final Field field) {
final Class type = field.getType();
final boolean isStatic = Modifier.isStatic(field.getModifiers());
final long offset = isStatic
? theUnsafe.staticFieldOffset(field)
: theUnsafe.objectFieldOffset(field);
if (!Modifier.isVolatile(field.getModifiers())) {
if (type == Boolean.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getBoolean(obj, offset);
}
public Class getType() {
return Boolean.TYPE;
}
};
}
if (type == Character.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getChar(obj, offset);
}
public Class getType() {
return Character.TYPE;
}
};
}
if (type == Byte.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getByte(obj, offset);
}
public Class getType() {
return Byte.TYPE;
}
};
}
if (type == Short.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getShort(obj, offset);
}
public Class getType() {
return Short.TYPE;
}
};
}
if (type == Integer.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getInt(obj, offset);
}
public Class getType() {
return Integer.TYPE;
}
};
}
if (type == Long.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getLong(obj, offset);
}
public Class getType() {
return Long.TYPE;
}
};
}
if (type == Float.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getFloat(obj, offset);
}
public Class getType() {
return Float.TYPE;
}
};
}
if (type == Double.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getDouble(obj, offset);
}
public Class getType() {
return Double.TYPE;
}
};
}
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getObject(obj, offset);
}
public Class getType() {
return type;
}
};
}
if (type == Boolean.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getBooleanVolatile(obj, offset);
}
public Class getType() {
return Boolean.TYPE;
}
};
}
if (type == Character.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getCharVolatile(obj, offset);
}
public Class getType() {
return Character.TYPE;
}
};
}
if (type == Byte.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getByteVolatile(obj, offset);
}
public Class getType() {
return Byte.TYPE;
}
};
}
if (type == Short.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getShortVolatile(obj, offset);
}
public Class getType() {
return Short.TYPE;
}
};
}
if (type == Integer.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getIntVolatile(obj, offset);
}
public Class getType() {
return Integer.TYPE;
}
};
}
if (type == Long.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getLongVolatile(obj, offset);
}
public Class getType() {
return Long.TYPE;
}
};
}
if (type == Float.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getFloatVolatile(obj, offset);
}
public Class getType() {
return Float.TYPE;
}
};
}
if (type == Double.TYPE) {
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getDoubleVolatile(obj, offset);
}
public Class getType() {
return Double.TYPE;
}
};
}
return new Getter() {
public Object getProperty(Object obj) {
return theUnsafe.getObjectVolatile(obj, offset);
}
public Class getType() {
return type;
}
};
}
public ObjectConstructor newConstructor(final Class<?> clazz) {
return getConstructor(clazz);
}
public static ObjectConstructor getConstructor(final Class<?> clazz) {
return new ObjectConstructor() {
public Object newInstance() {
try {
return theUnsafe.allocateInstance(clazz);
} catch (InstantiationException e) {
throw new Sql2oException("Could not create a new instance of class " + clazz, e);
}
}
};
}
}