Add license

lucene/core/src/java/org/apache/lucene/search/IndexSearcher.java

@@ -581,7 +581,8 @@ private static void enforceDistinctLeaves(LeafSlice leafSlice) {
    * @throws TooManyClauses If a query would exceed {@link IndexSearcher#getMaxClauseCount()}
    *     clauses.
    */
-  public TopDocs searchAfter(@Nullable ScoreDoc after, Query query, int numHits) throws IOException {
+  public TopDocs searchAfter(@Nullable ScoreDoc after, Query query, int numHits)
+      throws IOException {
     final int limit = Math.max(1, reader.maxDoc());
     if (after != null && after.doc >= limit) {
       throw new IllegalArgumentException(
@@ -714,7 +715,8 @@ public TopFieldDocs searchAfter(
   }
 
   private TopFieldDocs searchAfter(
-      @Nullable FieldDoc after, Query query, int numHits, Sort sort, boolean doDocScores) throws IOException {
+      @Nullable FieldDoc after, Query query, int numHits, Sort sort, boolean doDocScores)
+      throws IOException {
     final int limit = Math.max(1, reader.maxDoc());
     if (after != null && after.doc >= limit) {
       throw new IllegalArgumentException(

lucene/core/src/java/org/apache/lucene/search/TopFieldCollectorManager.java

@@ -77,7 +77,8 @@ public TopFieldCollectorManager(
    *     count of the result will be accurate. {@link Integer#MAX_VALUE} may be used to make the hit
    *     count accurate, but this will also make query processing slower.
    */
-  public TopFieldCollectorManager(Sort sort, int numHits, @Nullable FieldDoc after, int totalHitsThreshold) {
+  public TopFieldCollectorManager(
+      Sort sort, int numHits, @Nullable FieldDoc after, int totalHitsThreshold) {
     if (totalHitsThreshold < 0) {
       throw new IllegalArgumentException(
           "totalHitsThreshold must be >= 0, got " + totalHitsThreshold);

lucene/core/src/java/org/apache/lucene/search/TopScoreDocCollectorManager.java

@@ -83,7 +83,8 @@ public TopScoreDocCollectorManager(
    *     count of the result will be accurate. {@link Integer#MAX_VALUE} may be used to make the hit
    *     count accurate, but this will also make query processing slower.
    */
-  public TopScoreDocCollectorManager(int numHits, @Nullable ScoreDoc after, int totalHitsThreshold) {
+  public TopScoreDocCollectorManager(
+      int numHits, @Nullable ScoreDoc after, int totalHitsThreshold) {
     if (totalHitsThreshold < 0) {
       throw new IllegalArgumentException(
           "totalHitsThreshold must be >= 0, got " + totalHitsThreshold);

lucene/core/src/java/org/apache/lucene/util/Nullable.java

@@ -1,4 +1,33 @@
+/*
+ * 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 org.apache.lucene.util;
 
-public @interface Nullable {
-}
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotates a type to indicate that it is allowed to take {@code null} as a valid value.
+ *
+ * @lucene.internal
+ */
+@Documented
+@Target(ElementType.TYPE_USE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Nullable {}