001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to you under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.checkerframework.checker.nullness.qual;
018
019import java.lang.annotation.Documented;
020import java.lang.annotation.ElementType;
021import java.lang.annotation.Retention;
022import java.lang.annotation.RetentionPolicy;
023import java.lang.annotation.Target;
024
025/**
026 * Stub annotation for Calcite vendored code.
027 * This is a minimal implementation to satisfy compilation requirements.
028 * Source-only annotation, no runtime impact.
029 *
030 * <p>This annotation is used by vendored Apache Calcite code to indicate
031 * nullable types. It has no semantic meaning in GSP and is retained only
032 * for source compatibility.
033 */
034@Documented
035@Retention(RetentionPolicy.CLASS)
036@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
037public @interface Nullable {
038}