com.hazelcast.org.apache.calcite.sql.type.AssignableOperandTypeChecker 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.type;
import com.hazelcast.org.apache.calcite.linq4j.Ord;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
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.util.Pair;
import com.hazelcast.com.google.common.collect.ImmutableList;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
import java.util.List;
/**
* AssignableOperandTypeChecker implements {@link SqlOperandTypeChecker} by
* verifying that the type of each argument is assignable to a predefined set of
* parameter types (under the SQL definition of "assignable").
*/
public class AssignableOperandTypeChecker implements SqlOperandTypeChecker {
//~ Instance fields --------------------------------------------------------
private final List paramTypes;
private final @Nullable ImmutableList paramNames;
//~ Constructors -----------------------------------------------------------
/**
* Instantiates this strategy with a specific set of parameter types.
*
* @param paramTypes parameter types for operands; index in this array
* corresponds to operand number
* @param paramNames parameter names, or null
*/
public AssignableOperandTypeChecker(List paramTypes,
@Nullable List paramNames) {
this.paramTypes = ImmutableList.copyOf(paramTypes);
this.paramNames =
paramNames == null ? null : ImmutableList.copyOf(paramNames);
}
//~ Methods ----------------------------------------------------------------
@Override public boolean isOptional(int i) {
return false;
}
@Override public SqlOperandCountRange getOperandCountRange() {
return SqlOperandCountRanges.of(paramTypes.size());
}
@Override public boolean checkOperandTypes(
SqlCallBinding callBinding,
boolean throwOnFailure) {
// Do not use callBinding.operands(). We have not resolved to a function
// yet, therefore we do not know the ordered parameter names.
final List operands = callBinding.getCall().getOperandList();
for (Pair pair : Pair.zip(paramTypes, operands)) {
RelDataType argType = SqlTypeUtil.deriveType(callBinding, pair.right);
if (!SqlTypeUtil.canAssignFrom(pair.left, argType)) {
// TODO: add in unresolved function type cast.
if (throwOnFailure) {
throw callBinding.newValidationSignatureError();
} else {
return false;
}
}
}
return true;
}
@Override public String getAllowedSignatures(SqlOperator op, String opName) {
StringBuilder sb = new StringBuilder();
sb.append(opName);
sb.append("(");
for (Ord paramType : Ord.zip(paramTypes)) {
if (paramType.i > 0) {
sb.append(", ");
}
if (paramNames != null) {
sb.append(paramNames.get(paramType.i))
.append(" => ");
}
sb.append("<");
sb.append(paramType.e.getFamily());
sb.append(">");
}
sb.append(")");
return sb.toString();
}
@Override public Consistency getConsistency() {
return Consistency.NONE;
}
}