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/*
* 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.trino.operator.scalar.annotations;
import com.google.common.base.Joiner;
import io.trino.spi.function.OperatorType;
import io.trino.spi.type.StandardTypes;
import io.trino.spi.type.TypeSignature;
import io.trino.type.UnknownType;
import java.util.List;
import static com.google.common.base.Preconditions.checkArgument;
public final class OperatorValidator
{
private OperatorValidator() {}
public static void validateOperator(OperatorType operatorType, TypeSignature returnType, List argumentTypes)
{
switch (operatorType) {
case ADD:
case SUBTRACT:
case MULTIPLY:
case DIVIDE:
case MODULUS:
validateOperatorSignature(operatorType, returnType, argumentTypes, 2);
break;
case NEGATION:
validateOperatorSignature(operatorType, returnType, argumentTypes, 1);
break;
case EQUAL:
case COMPARISON_UNORDERED_LAST:
case COMPARISON_UNORDERED_FIRST:
case LESS_THAN:
case LESS_THAN_OR_EQUAL:
validateComparisonOperatorSignature(operatorType, returnType, argumentTypes, 2);
break;
case CAST:
validateOperatorSignature(operatorType, returnType, argumentTypes, 1);
break;
case SUBSCRIPT:
validateOperatorSignature(operatorType, returnType, argumentTypes, 2);
checkArgument(argumentTypes.get(0).getBase().equals(StandardTypes.ARRAY) || argumentTypes.get(0).getBase().equals(StandardTypes.MAP), "First argument must be an ARRAY or MAP");
if (argumentTypes.get(0).getBase().equals(StandardTypes.ARRAY)) {
checkArgument(argumentTypes.get(1).getBase().equals(StandardTypes.BIGINT), "Second argument must be a BIGINT");
TypeSignature elementType = argumentTypes.get(0).getTypeParametersAsTypeSignatures().get(0);
checkArgument(returnType.equals(elementType), "[] return type does not match ARRAY element type");
}
else {
TypeSignature valueType = argumentTypes.get(0).getTypeParametersAsTypeSignatures().get(1);
checkArgument(returnType.equals(valueType), "[] return type does not match MAP value type");
}
break;
case HASH_CODE:
validateOperatorSignature(operatorType, returnType, argumentTypes, 1);
checkArgument(returnType.getBase().equals(StandardTypes.BIGINT), "%s operator must return a BIGINT: %s", operatorType, formatSignature(operatorType, returnType, argumentTypes));
break;
case SATURATED_FLOOR_CAST:
validateOperatorSignature(operatorType, returnType, argumentTypes, 1);
break;
case IS_DISTINCT_FROM:
case XX_HASH_64:
case INDETERMINATE:
case READ_VALUE:
// TODO
}
}
private static void validateOperatorSignature(OperatorType operatorType, TypeSignature returnType, List argumentTypes, int expectedArgumentCount)
{
String signature = formatSignature(operatorType, returnType, argumentTypes);
checkArgument(!returnType.getBase().equals(UnknownType.NAME), "%s operator return type cannot be NULL: %s", operatorType, signature);
checkArgument(argumentTypes.size() == expectedArgumentCount, "%s operator must have exactly %s argument: %s", operatorType, expectedArgumentCount, signature);
}
private static void validateComparisonOperatorSignature(OperatorType operatorType, TypeSignature returnType, List argumentTypes, int expectedArgumentCount)
{
validateOperatorSignature(operatorType, returnType, argumentTypes, expectedArgumentCount);
checkArgument(returnType.getBase().equals(StandardTypes.BOOLEAN), "%s operator must return a BOOLEAN: %s", operatorType, formatSignature(operatorType, returnType, argumentTypes));
}
private static String formatSignature(OperatorType operatorType, TypeSignature returnType, List argumentTypes)
{
return operatorType + "(" + Joiner.on(", ").join(argumentTypes) + ")::" + returnType;
}
}
