com.hazelcast.org.apache.calcite.sql.SqlWithItem 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.sql.parser.SqlParserPos;
import com.hazelcast.org.apache.calcite.util.ImmutableNullableList;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
import java.util.List;
/**
* An item in a WITH clause of a query.
* It has a name, an optional column list, and a query.
*/
public class SqlWithItem extends SqlCall {
public SqlIdentifier name;
public @Nullable SqlNodeList columnList; // may be null
public SqlNode query;
public SqlWithItem(SqlParserPos pos, SqlIdentifier name,
@Nullable SqlNodeList columnList, SqlNode query) {
super(pos);
this.name = name;
this.columnList = columnList;
this.query = query;
}
//~ Methods ----------------------------------------------------------------
@Override public SqlKind getKind() {
return SqlKind.WITH_ITEM;
}
@SuppressWarnings("nullness")
@Override public List getOperandList() {
return ImmutableNullableList.of(name, columnList, query);
}
@SuppressWarnings("assignment.type.incompatible")
@Override public void setOperand(int i, @Nullable SqlNode operand) {
switch (i) {
case 0:
name = (SqlIdentifier) operand;
break;
case 1:
columnList = (@Nullable SqlNodeList) operand;
break;
case 2:
query = operand;
break;
default:
throw new AssertionError(i);
}
}
@Override public SqlOperator getOperator() {
return SqlWithItemOperator.INSTANCE;
}
/**
* SqlWithItemOperator is used to represent an item in a WITH clause of a
* query. It has a name, an optional column list, and a query.
*/
private static class SqlWithItemOperator extends SqlSpecialOperator {
private static final SqlWithItemOperator INSTANCE =
new SqlWithItemOperator();
SqlWithItemOperator() {
super("WITH_ITEM", SqlKind.WITH_ITEM, 0);
}
//~ Methods ----------------------------------------------------------------
@Override public void unparse(
SqlWriter writer,
SqlCall call,
int leftPrec,
int rightPrec) {
final SqlWithItem withItem = (SqlWithItem) call;
withItem.name.unparse(writer, getLeftPrec(), getRightPrec());
if (withItem.columnList != null) {
withItem.columnList.unparse(writer, getLeftPrec(), getRightPrec());
}
writer.keyword("AS");
withItem.query.unparse(writer, 10, 10);
}
@SuppressWarnings("argument.type.incompatible")
@Override public SqlCall createCall(@Nullable SqlLiteral functionQualifier,
SqlParserPos pos, @Nullable SqlNode... operands) {
assert functionQualifier == null;
assert operands.length == 3;
return new SqlWithItem(pos, (SqlIdentifier) operands[0],
(SqlNodeList) operands[1], operands[2]);
}
}
}
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