com.hazelcast.jet.sql.impl.validate.param.NumericPrecedenceParameterConverter Maven / Gradle / Ivy
/*
* Copyright 2021 Hazelcast Inc.
*
* Licensed under the Hazelcast Community License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://hazelcast.com/hazelcast-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.jet.sql.impl.validate.param;
import com.hazelcast.sql.impl.type.QueryDataType;
import com.hazelcast.sql.impl.type.QueryDataTypeFamily;
import com.hazelcast.sql.impl.type.converter.Converter;
import com.hazelcast.org.apache.calcite.sql.parser.SqlParserPos;
public class NumericPrecedenceParameterConverter extends AbstractParameterConverter {
public NumericPrecedenceParameterConverter(int ordinal, SqlParserPos parserPos, QueryDataType targetType) {
super(ordinal, parserPos, targetType);
}
@Override
protected boolean isValid(Object value, Converter valueConverter) {
QueryDataTypeFamily valueTypeFamily = valueConverter.getTypeFamily();
if (!valueTypeFamily.isNumeric()) {
// conversion from non-numeric value where a numeric parameter is expected isn't allowed
return false;
}
if (valueTypeFamily.getPrecedence() <= targetType.getTypeFamily().getPrecedence()) {
// Conversion from value with lower precedence to target with higher precedence is allowed.
// For examplce, conversion from INTEGER to BIGINT is allowed or from BIGINT to REAL
return true;
}
if (targetType.getTypeFamily().isNumericInteger() && valueConverter.getTypeFamily().isNumericInteger()) {
// we allow conversion among any integer types. If the value is out of range, it will fail later.
return true;
}
// we don't allow conversion from numeric types with higher precedence to lower precedence types.
// For example conversion from DOUBLE to DECIMAL isn't allowed, or from DECIMAL to integer types.
// The reason is that precision loss is possible.
return false;
}
}
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