/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.cql3.functions;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
import java.util.List;
import com.datastax.driver.core.CodecRegistry;
import com.datastax.driver.core.DataType;
import com.datastax.driver.core.ProtocolVersion;
import com.datastax.driver.core.TypeCodec;
import com.datastax.driver.core.exceptions.InvalidTypeException;
import org.apache.cassandra.cql3.CQL3Type;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.transport.Server;
/**
* Helper class for User Defined Functions + Aggregates.
*/
public final class UDHelper
{
// TODO make these c'tors and methods public in Java-Driver - see https://datastax-oss.atlassian.net/browse/JAVA-502
private static final MethodHandle methodParseOne;
private static final CodecRegistry codecRegistry;
static
{
try
{
Class<?> cls = Class.forName("com.datastax.driver.core.DataTypeClassNameParser");
Method m = cls.getDeclaredMethod("parseOne", String.class, ProtocolVersion.class, CodecRegistry.class);
m.setAccessible(true);
methodParseOne = MethodHandles.lookup().unreflect(m);
codecRegistry = new CodecRegistry();
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
static TypeCodec<Object>[] codecsFor(DataType[] dataType)
{
TypeCodec<Object>[] codecs = new TypeCodec[dataType.length];
for (int i = 0; i < dataType.length; i++)
codecs[i] = codecFor(dataType[i]);
return codecs;
}
static TypeCodec<Object> codecFor(DataType dataType)
{
return codecRegistry.codecFor(dataType);
}
/**
* Construct an array containing the Java classes for the given Java Driver {@link com.datastax.driver.core.DataType}s.
*
* @param dataTypes array with UDF argument types
* @param calledOnNullInput whether to allow {@code null} as an argument value
* @return array of same size with UDF arguments
*/
public static Class<?>[] javaTypes(TypeCodec<Object>[] dataTypes, boolean calledOnNullInput)
{
Class<?>[] paramTypes = new Class[dataTypes.length];
for (int i = 0; i < paramTypes.length; i++)
{
Class<?> clazz = asJavaClass(dataTypes[i]);
if (!calledOnNullInput)
{
// only care about classes that can be used in a data type
if (clazz == Integer.class)
clazz = int.class;
else if (clazz == Long.class)
clazz = long.class;
else if (clazz == Byte.class)
clazz = byte.class;
else if (clazz == Short.class)
clazz = short.class;
else if (clazz == Float.class)
clazz = float.class;
else if (clazz == Double.class)
clazz = double.class;
else if (clazz == Boolean.class)
clazz = boolean.class;
}
paramTypes[i] = clazz;
}
return paramTypes;
}
/**
* Construct an array containing the Java Driver {@link com.datastax.driver.core.DataType}s for the
* C* internal types.
*
* @param abstractTypes list with UDF argument types
* @return array with argument types as {@link com.datastax.driver.core.DataType}
*/
public static DataType[] driverTypes(List<AbstractType<?>> abstractTypes)
{
DataType[] argDataTypes = new DataType[abstractTypes.size()];
for (int i = 0; i < argDataTypes.length; i++)
argDataTypes[i] = driverType(abstractTypes.get(i));
return argDataTypes;
}
/**
* Returns the Java Driver {@link com.datastax.driver.core.DataType} for the C* internal type.
*/
public static DataType driverType(AbstractType abstractType)
{
CQL3Type cqlType = abstractType.asCQL3Type();
try
{
return (DataType) methodParseOne.invoke(cqlType.getType().toString(),
ProtocolVersion.fromInt(Server.CURRENT_VERSION),
codecRegistry);
}
catch (RuntimeException | Error e)
{
// immediately rethrow these...
throw e;
}
catch (Throwable e)
{
throw new RuntimeException("cannot parse driver type " + cqlType.getType().toString(), e);
}
}
public static Object deserialize(TypeCodec<?> codec, int protocolVersion, ByteBuffer value)
{
return codec.deserialize(value, ProtocolVersion.fromInt(protocolVersion));
}
public static ByteBuffer serialize(TypeCodec<?> codec, int protocolVersion, Object value)
{
if (!codec.getJavaType().getRawType().isAssignableFrom(value.getClass()))
throw new InvalidTypeException("Invalid value for CQL type " + codec.getCqlType().getName().toString());
return ((TypeCodec)codec).serialize(value, ProtocolVersion.fromInt(protocolVersion));
}
public static Class<?> asJavaClass(TypeCodec<?> codec)
{
return codec.getJavaType().getRawType();
}
public static boolean isNullOrEmpty(AbstractType<?> type, ByteBuffer bb)
{
return bb == null ||
(bb.remaining() == 0 && type.isEmptyValueMeaningless());
}
}