io.trino.sql.parser.RefreshableSqlBaseParserInitializer Maven / Gradle / Ivy
/*
* Licensed 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 io.trino.sql.parser;
import com.google.errorprone.annotations.ThreadSafe;
import io.trino.grammar.sql.SqlBaseLexer;
import io.trino.grammar.sql.SqlBaseParser;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.BiConsumer;
@ThreadSafe
public final class RefreshableSqlBaseParserInitializer
implements BiConsumer
{
private final AtomicReference caches = new AtomicReference<>();
public RefreshableSqlBaseParserInitializer()
{
refresh();
}
public void refresh()
{
caches.set(new SqlBaseParserAndLexerATNCaches());
}
@Override
public void accept(SqlBaseLexer lexer, SqlBaseParser parser)
{
SqlBaseParserAndLexerATNCaches caches = this.caches.get();
caches.lexer.configureLexer(lexer);
caches.parser.configureParser(parser);
}
private static final class SqlBaseParserAndLexerATNCaches
{
public final AntlrATNCacheFields lexer = new AntlrATNCacheFields(SqlBaseLexer._ATN);
public final AntlrATNCacheFields parser = new AntlrATNCacheFields(SqlBaseParser._ATN);
}
}