com.hazelcast.org.apache.calcite.sql.SqlTypeNameSpec 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;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.sql.parser.SqlParserPos;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidator;
import com.hazelcast.org.apache.calcite.util.Litmus;
/**
* A SqlTypeNameSpec is a type name specification that allows user to
* customize sql node unparsing and data type deriving.
*
* To customize sql node unparsing, override the method
* {@link #unparse(SqlWriter, int, int)}.
*
*
To customize data type deriving, override the method
* {@link #deriveType(SqlValidator)}.
*/
public abstract class SqlTypeNameSpec {
private final SqlIdentifier typeName;
private final SqlParserPos pos;
/**
* Creates a {@code SqlTypeNameSpec}.
*
* @param name Name of the type
* @param pos Parser position, must not be null
*/
public SqlTypeNameSpec(SqlIdentifier name, SqlParserPos pos) {
this.typeName = name;
this.pos = pos;
}
/**
* Derive type from this SqlTypeNameSpec.
*
* @param validator The sql validator
* @return the {@code RelDataType} instance, throws exception if we could not
* deduce the type
*/
public abstract RelDataType deriveType(SqlValidator validator);
/** Writes a SQL representation of this spec to a writer. */
public abstract void unparse(SqlWriter writer, int leftPrec, int rightPrec);
/** Returns whether this spec is structurally equivalent to another spec. */
public abstract boolean equalsDeep(SqlTypeNameSpec spec, Litmus litmus);
public SqlParserPos getParserPos() {
return pos;
}
public SqlIdentifier getTypeName() {
return typeName;
}
}