com.hazelcast.org.apache.calcite.sql.type.LiteralOperandTypeChecker Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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.org.apache.calcite.sql.type;
import com.hazelcast.org.apache.calcite.sql.SqlCallBinding;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.sql.SqlOperandCountRange;
import com.hazelcast.org.apache.calcite.sql.SqlOperator;
import com.hazelcast.org.apache.calcite.sql.SqlUtil;
import com.hazelcast.org.apache.calcite.util.Util;
import static com.hazelcast.org.apache.calcite.util.Static.RESOURCE;
/**
* Parameter type-checking strategy type must be a literal (whether null is
* allowed is determined by the constructor). CAST(NULL as ...)
is
* considered to be a NULL literal but not CAST(CAST(NULL as ...) AS
* ...)
*/
public class LiteralOperandTypeChecker implements SqlSingleOperandTypeChecker {
//~ Instance fields --------------------------------------------------------
private boolean allowNull;
//~ Constructors -----------------------------------------------------------
public LiteralOperandTypeChecker(boolean allowNull) {
this.allowNull = allowNull;
}
//~ Methods ----------------------------------------------------------------
public boolean isOptional(int i) {
return false;
}
public boolean checkSingleOperandType(
SqlCallBinding callBinding,
SqlNode node,
int iFormalOperand,
boolean throwOnFailure) {
Util.discard(iFormalOperand);
if (SqlUtil.isNullLiteral(node, true)) {
if (allowNull) {
return true;
}
if (throwOnFailure) {
throw callBinding.newError(
RESOURCE.argumentMustNotBeNull(
callBinding.getOperator().getName()));
}
return false;
}
if (!SqlUtil.isLiteral(node) && !SqlUtil.isLiteralChain(node)) {
if (throwOnFailure) {
throw callBinding.newError(
RESOURCE.argumentMustBeLiteral(
callBinding.getOperator().getName()));
}
return false;
}
return true;
}
public boolean checkOperandTypes(
SqlCallBinding callBinding,
boolean throwOnFailure) {
return checkSingleOperandType(
callBinding,
callBinding.operand(0),
0,
throwOnFailure);
}
public SqlOperandCountRange getOperandCountRange() {
return SqlOperandCountRanges.of(1);
}
public String getAllowedSignatures(SqlOperator op, String opName) {
return "";
}
public Consistency getConsistency() {
return Consistency.NONE;
}
}