com.hazelcast.org.apache.calcite.sql.SqlInfixOperator 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 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.org.apache.calcite.sql;
import com.hazelcast.org.apache.calcite.linq4j.Ord;
import com.hazelcast.org.apache.calcite.sql.type.SqlOperandTypeChecker;
import com.hazelcast.org.apache.calcite.sql.type.SqlOperandTypeInference;
import com.hazelcast.org.apache.calcite.sql.type.SqlReturnTypeInference;
/**
* A generalization of a binary operator to involve several (two or more)
* arguments, and keywords between each pair of arguments.
*
* For example, the BETWEEN operator is ternary, and has syntax
* exp1 BETWEEN exp2 AND exp3.
*/
public class SqlInfixOperator extends SqlSpecialOperator {
//~ Instance fields --------------------------------------------------------
private final String[] names;
//~ Constructors -----------------------------------------------------------
protected SqlInfixOperator(
String[] names,
SqlKind kind,
int precedence,
SqlReturnTypeInference returnTypeInference,
SqlOperandTypeInference operandTypeInference,
SqlOperandTypeChecker operandTypeChecker) {
super(
names[0],
kind,
precedence,
true,
returnTypeInference,
operandTypeInference,
operandTypeChecker);
assert names.length > 1;
this.names = names;
}
//~ Methods ----------------------------------------------------------------
public void unparse(
SqlWriter writer,
SqlCall call,
int leftPrec,
int rightPrec) {
assert call.operandCount() == names.length + 1;
final boolean needWhitespace = needsSpace();
for (Ord operand : Ord.zip(call.getOperandList())) {
if (operand.i > 0) {
writer.setNeedWhitespace(needWhitespace);
writer.keyword(names[operand.i - 1]);
writer.setNeedWhitespace(needWhitespace);
}
operand.e.unparse(writer, leftPrec, getLeftPrec());
}
}
}