| /* |
| * 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; |
| |
| |
| import java.io.IOException; |
| |
| /** |
| * A simple iterator interface for {@link BytesRef} iteration. |
| */ |
| public interface BytesRefIterator { |
| |
| /** |
| * Increments the iteration to the next {@link BytesRef} in the iterator. |
| * Returns the resulting {@link BytesRef} or <code>null</code> if the end of |
| * the iterator is reached. The returned BytesRef may be re-used across calls |
| * to next. After this method returns null, do not call it again: the results |
| * are undefined. |
| * |
| * @return the next {@link BytesRef} in the iterator or <code>null</code> if |
| * the end of the iterator is reached. |
| * @throws IOException If there is a low-level I/O error. |
| */ |
| BytesRef next() throws IOException; |
| |
| /** Singleton BytesRefIterator that iterates over 0 BytesRefs. */ |
| BytesRefIterator EMPTY = () -> null; |
| } |