--- /dev/null
+package org.apache.lucene.queryParser.core.nodes;
+
+/**
+ * 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.
+ */
+
+import org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax;
+
+/**
+ * A {@link NoTokenFoundQueryNode} is used if a term is convert into no tokens
+ * by the tokenizer/lemmatizer/analyzer (null).
+ */
+public class NoTokenFoundQueryNode extends DeletedQueryNode {
+
+ private static final long serialVersionUID = 7332975497586993833L;
+
+ public NoTokenFoundQueryNode() {
+ super();
+ }
+
+ @Override
+ public CharSequence toQueryString(EscapeQuerySyntax escaper) {
+ return "[NTF]";
+ }
+
+ @Override
+ public String toString() {
+ return "<notokenfound/>";
+ }
+
+ @Override
+ public QueryNode cloneTree() throws CloneNotSupportedException {
+ NoTokenFoundQueryNode clone = (NoTokenFoundQueryNode) super.cloneTree();
+
+ // nothing to do here
+
+ return clone;
+ }
+}