io.prestosql.type.VarcharParametricType Maven / Gradle / Ivy
/*
* 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 io.prestosql.type;
import io.prestosql.spi.type.ParametricType;
import io.prestosql.spi.type.StandardTypes;
import io.prestosql.spi.type.Type;
import io.prestosql.spi.type.TypeManager;
import io.prestosql.spi.type.TypeParameter;
import io.prestosql.spi.type.VarcharType;
import java.util.List;
import static io.prestosql.spi.type.VarcharType.createUnboundedVarcharType;
public class VarcharParametricType
implements ParametricType
{
public static final VarcharParametricType VARCHAR = new VarcharParametricType();
@Override
public String getName()
{
return StandardTypes.VARCHAR;
}
@Override
public Type createType(TypeManager typeManager, List parameters)
{
if (parameters.isEmpty()) {
return createUnboundedVarcharType();
}
if (parameters.size() != 1) {
throw new IllegalArgumentException("Expected exactly one parameter for VARCHAR");
}
TypeParameter parameter = parameters.get(0);
if (!parameter.isLongLiteral()) {
throw new IllegalArgumentException("VARCHAR length must be a number");
}
long length = parameter.getLongLiteral();
if (length == VarcharType.UNBOUNDED_LENGTH) {
return VarcharType.createUnboundedVarcharType();
}
if (length < 0 || length > VarcharType.MAX_LENGTH) {
throw new IllegalArgumentException("Invalid VARCHAR length " + length);
}
return VarcharType.createVarcharType((int) length);
}
}