/*
* Licensed 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 com.facebook.presto.hive;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.spi.type.TypeManager;
import com.facebook.presto.spi.type.VarcharType;
import javax.inject.Inject;
import static com.facebook.presto.hive.HiveType.HIVE_BYTE;
import static com.facebook.presto.hive.HiveType.HIVE_DOUBLE;
import static com.facebook.presto.hive.HiveType.HIVE_FLOAT;
import static com.facebook.presto.hive.HiveType.HIVE_INT;
import static com.facebook.presto.hive.HiveType.HIVE_LONG;
import static com.facebook.presto.hive.HiveType.HIVE_SHORT;
import static java.util.Objects.requireNonNull;
public class HiveCoercionPolicy
implements CoercionPolicy
{
private final TypeManager typeManager;
@Inject
public HiveCoercionPolicy(TypeManager typeManager)
{
this.typeManager = requireNonNull(typeManager, "typeManager is null");
}
@Override
public boolean canCoerce(HiveType fromHiveType, HiveType toHiveType)
{
Type fromType = typeManager.getType(fromHiveType.getTypeSignature());
Type toType = typeManager.getType(toHiveType.getTypeSignature());
if (fromType instanceof VarcharType) {
return toHiveType.equals(HIVE_BYTE) || toHiveType.equals(HIVE_SHORT) || toHiveType.equals(HIVE_INT) || toHiveType.equals(HIVE_LONG);
}
if (toType instanceof VarcharType) {
return fromHiveType.equals(HIVE_BYTE) || fromHiveType.equals(HIVE_SHORT) || fromHiveType.equals(HIVE_INT) || fromHiveType.equals(HIVE_LONG);
}
if (fromHiveType.equals(HIVE_BYTE)) {
return toHiveType.equals(HIVE_SHORT) || toHiveType.equals(HIVE_INT) || toHiveType.equals(HIVE_LONG);
}
if (fromHiveType.equals(HIVE_SHORT)) {
return toHiveType.equals(HIVE_INT) || toHiveType.equals(HIVE_LONG);
}
if (fromHiveType.equals(HIVE_INT)) {
return toHiveType.equals(HIVE_LONG);
}
if (fromHiveType.equals(HIVE_FLOAT)) {
return toHiveType.equals(HIVE_DOUBLE);
}
return false;
}
}