common/src/com/android/tools/layoutlib/annotations/Nullable.java

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * 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 com.android.tools.layoutlib.annotations;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * Denotes a parameter or field can be null.
 * <p/>
 * When decorating a method call parameter, this denotes the parameter can
 * legitimately be null and the method will gracefully deal with it. Typically used
 * on optional parameters.
 * <p/>
 * When decorating a method, this denotes the method might legitimately return null.
 * <p/>
 * This is a marker annotation and it has no specific attributes.
 */
@Retention(RetentionPolicy.SOURCE)
public @interface Nullable {
}