com.hazelcast.org.apache.calcite.sql.ddl.SqlKeyConstraint 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.ddl;
import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlIdentifier;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.sql.SqlNodeList;
import com.hazelcast.org.apache.calcite.sql.SqlOperator;
import com.hazelcast.org.apache.calcite.sql.SqlSpecialOperator;
import com.hazelcast.org.apache.calcite.sql.SqlWriter;
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;
/**
* Parse tree for {@code UNIQUE}, {@code PRIMARY KEY} constraints.
*
* And {@code FOREIGN KEY}, when we support it.
*/
public class SqlKeyConstraint extends SqlCall {
private static final SqlSpecialOperator UNIQUE =
new SqlSpecialOperator("UNIQUE", SqlKind.UNIQUE);
protected static final SqlSpecialOperator PRIMARY =
new SqlSpecialOperator("PRIMARY KEY", SqlKind.PRIMARY_KEY);
private final @Nullable SqlIdentifier name;
private final SqlNodeList columnList;
/** Creates a SqlKeyConstraint. */
SqlKeyConstraint(SqlParserPos pos, @Nullable SqlIdentifier name,
SqlNodeList columnList) {
super(pos);
this.name = name;
this.columnList = columnList;
}
/** Creates a UNIQUE constraint. */
public static SqlKeyConstraint unique(SqlParserPos pos, SqlIdentifier name,
SqlNodeList columnList) {
return new SqlKeyConstraint(pos, name, columnList);
}
/** Creates a PRIMARY KEY constraint. */
public static SqlKeyConstraint primary(SqlParserPos pos, SqlIdentifier name,
SqlNodeList columnList) {
return new SqlKeyConstraint(pos, name, columnList) {
@Override public SqlOperator getOperator() {
return PRIMARY;
}
};
}
@Override public SqlOperator getOperator() {
return UNIQUE;
}
@SuppressWarnings("nullness")
@Override public List getOperandList() {
return ImmutableNullableList.of(name, columnList);
}
@Override public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
if (name != null) {
writer.keyword("CONSTRAINT");
name.unparse(writer, 0, 0);
}
writer.keyword(getOperator().getName()); // "UNIQUE" or "PRIMARY KEY"
columnList.unparse(writer, 1, 1);
}
}