com.hazelcast.org.apache.calcite.sql.SqlAlienSystemTypeNameSpec 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.sql.type.SqlTypeName;
import com.hazelcast.org.apache.calcite.util.Litmus;
import java.util.Objects;
/**
* Represents a type name for an alien system. For example,
* UNSIGNED is a built-in type in MySQL which is synonym of INTEGER.
*
* You can use this class to define a customized type name with specific alias,
* for example, in some systems, STRING is synonym of VARCHAR
* and BYTES is synonym of VARBINARY.
*
*
Internally we may use the {@link SqlAlienSystemTypeNameSpec} to unparse
* as the builtin data type name for some alien systems during rel-to-sql conversion.
*/
public class SqlAlienSystemTypeNameSpec extends SqlBasicTypeNameSpec {
//~ Instance fields --------------------------------------------------------
// Type alias used for unparsing.
private final String typeAlias;
//~ Constructors -----------------------------------------------------------
/**
* Creates a {@code SqlAlienSystemTypeNameSpec} instance.
*
* @param typeAlias Type alias of the alien system
* @param typeName Type name the {@code typeAlias} implies as the (standard) basic type name
* @param pos The parser position
*/
public SqlAlienSystemTypeNameSpec(
String typeAlias,
SqlTypeName typeName,
SqlParserPos pos) {
this(typeAlias, typeName, -1, pos);
}
/**
* Creates a {@code SqlAlienSystemTypeNameSpec} instance.
*
* @param typeAlias Type alias of the alien system
* @param typeName Type name the {@code typeAlias} implies as the (standard) basic type name
* @param precision Type Precision
* @param pos The parser position
*/
public SqlAlienSystemTypeNameSpec(
String typeAlias,
SqlTypeName typeName,
int precision,
SqlParserPos pos) {
super(typeName, precision, pos);
this.typeAlias = typeAlias;
}
//~ Methods ----------------------------------------------------------------
@Override public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
writer.keyword(typeAlias);
}
@Override public boolean equalsDeep(SqlTypeNameSpec node, Litmus litmus) {
if (!(node instanceof SqlAlienSystemTypeNameSpec)) {
return litmus.fail("{} != {}", this, node);
}
SqlAlienSystemTypeNameSpec that = (SqlAlienSystemTypeNameSpec) node;
if (!Objects.equals(this.typeAlias, that.typeAlias)) {
return litmus.fail("{} != {}", this, node);
}
return super.equalsDeep(node, litmus);
}
}