--- /dev/null
+package org.apache.lucene.facet.taxonomy;
+
+/**
+ * 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.
+ */
+
+/**
+ * Exception indicating that a certain operation could not be performed
+ * on a taxonomy related object because of an inconsistency.
+ * <p>
+ * For example, trying to refresh a taxonomy reader might fail in case
+ * the underlying taxonomy was meanwhile modified in a manner which
+ * does not allow to perform such a refresh. (See {@link TaxonomyReader#refresh()}.)
+ *
+ * @lucene.experimental
+ */
+public class InconsistentTaxonomyException extends Exception {
+
+ public InconsistentTaxonomyException(String message) {
+ super(message);
+ }
+
+ public InconsistentTaxonomyException() {
+ super();
+ }
+
+}