com.hazelcast.sql.impl.calcite.validate.operand.AbstractOperandChecker Maven / Gradle / Ivy

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/*
 * Copyright (c) 2008-2021, Hazelcast, Inc. All Rights Reserved.
 *
 * 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.hazelcast.sql.impl.calcite.validate.operand;

import com.hazelcast.sql.impl.ParameterConverter;
import com.hazelcast.sql.impl.calcite.validate.HazelcastSqlValidator;
import com.hazelcast.sql.impl.calcite.validate.HazelcastCallBinding;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.org.apache.calcite.sql.SqlDynamicParam;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;

public abstract class AbstractOperandChecker implements OperandChecker {
    protected AbstractOperandChecker() {
        // No-op
    }

    @Override
    public boolean check(HazelcastCallBinding callBinding, boolean throwOnFailure, int operandIndex) {
        HazelcastSqlValidator validator = callBinding.getValidator();

        SqlNode operand = callBinding.getCall().operand(operandIndex);

        // Handle parameter
        if (operand.getKind() == SqlKind.DYNAMIC_PARAM) {
            SqlDynamicParam operand0 = (SqlDynamicParam) operand;

            // Set parameter type
            RelDataType type = getTargetType(validator.getTypeFactory(), true);
            validator.setValidatedNodeType(operand, type);

            // Set parameter converter
            ParameterConverter converter = parameterConverter(operand0);
            validator.setParameterConverter(operand0.getIndex(), converter);

            return true;
        }

        RelDataType operandType = validator.deriveType(callBinding.getScope(), operand);

        assert operandType.getSqlTypeName() != SqlTypeName.NULL : "Operand type is not resolved";

        // Handle type match
        if (matchesTargetType(operandType)) {
            return true;
        }

        // Handle coercion if possible
        if (coerce(validator, callBinding, operand, operandType, operandIndex)) {
            return true;
        }

        // Failed
        if (throwOnFailure) {
            throw callBinding.newValidationSignatureError();
        } else {
            return false;
        }
    }

    protected abstract RelDataType getTargetType(RelDataTypeFactory factory, boolean nullable);

    protected abstract boolean matchesTargetType(RelDataType operandType);

    protected abstract ParameterConverter parameterConverter(SqlDynamicParam operand);

    protected abstract boolean coerce(
        HazelcastSqlValidator validator,
        HazelcastCallBinding callBinding,
        SqlNode operand,
        RelDataType operandType,
        int operandIndex
    );
}