/*
* 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.index;
import org.apache.lucene.util.BytesRefIterator;
/** Iterates over terms in across multiple fields. The caller must
* check {@link #field} after each {@link #next} to see if the field
* changed, but {@code ==} can be used since the iterator
* implementation ensures it will use the same String instance for
* a given field. */
abstract class FieldTermIterator implements BytesRefIterator {
/** Returns current field. This method should not be called
* after iteration is done. Note that you may use == to
* detect a change in field. */
abstract String field();
/** Del gen of the current term. */
// TODO: this is really per-iterator not per term, but when we use MergedPrefixCodedTermsIterator we need to know which iterator we are on
abstract long delGen();
}