org.sql2o.reflection.UnsafeFieldSetterFactory Maven / Gradle / Ivy
package org.sql2o.reflection;
import org.sql2o.Sql2oException;
import sun.misc.Unsafe;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
@SuppressWarnings("Unsafe")
public class UnsafeFieldSetterFactory implements FieldSetterFactory, 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 Setter newSetter(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 Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putBoolean(obj, offset, (Boolean) value);
}
public Class getType() {
return Boolean.TYPE;
}
};
}
if (type == Character.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putChar(obj, offset, (Character) value);
}
public Class getType() {
return Character.TYPE;
}
};
}
if (type == Byte.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putByte(obj, offset, ((Number) value).byteValue());
}
public Class getType() {
return Byte.TYPE;
}
};
}
if (type == Short.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putShort(obj, offset, ((Number) value).shortValue());
}
public Class getType() {
return Short.TYPE;
}
};
}
if (type == Integer.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putInt(obj, offset, ((Number) value).intValue());
}
public Class getType() {
return Integer.TYPE;
}
};
}
if (type == Long.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putLong(obj, offset, ((Number) value).longValue());
}
public Class getType() {
return Long.TYPE;
}
};
}
if (type == Float.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putFloat(obj, offset, ((Number) value).floatValue());
}
public Class getType() {
return Float.TYPE;
}
};
}
if (type == Double.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putDouble(obj, offset, ((Number) value).doubleValue());
}
public Class getType() {
return Double.TYPE;
}
};
}
return new Setter() {
public void setProperty(Object obj, Object value) {
theUnsafe.putObject(obj, offset, value);
}
public Class getType() {
return type;
}
};
}
if (type == Boolean.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putBooleanVolatile(obj, offset, (Boolean) value);
}
public Class getType() {
return Boolean.TYPE;
}
};
}
if (type == Character.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putCharVolatile(obj, offset, (Character) value);
}
public Class getType() {
return Character.TYPE;
}
};
}
if (type == Byte.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putByteVolatile(obj, offset, ((Number) value).byteValue());
}
public Class getType() {
return Byte.TYPE;
}
};
}
if (type == Short.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putShortVolatile(obj, offset, ((Number) value).shortValue());
}
public Class getType() {
return Short.TYPE;
}
};
}
if (type == Integer.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putIntVolatile(obj, offset, ((Number) value).intValue());
}
public Class getType() {
return Integer.TYPE;
}
};
}
if (type == Long.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putLongVolatile(obj, offset, ((Number) value).longValue());
}
public Class getType() {
return Long.TYPE;
}
};
}
if (type == Float.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putFloatVolatile(obj, offset, ((Number) value).floatValue());
}
public Class getType() {
return Float.TYPE;
}
};
}
if (type == Double.TYPE) {
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null) return;
theUnsafe.putDoubleVolatile(obj, offset, ((Number) value).doubleValue());
}
public Class getType() {
return Double.TYPE;
}
};
}
return new Setter() {
public void setProperty(Object obj, Object value) {
theUnsafe.putObjectVolatile(obj, offset, value);
}
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);
}
}
};
}
}
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