fix filename

src/main/java/gov/nih/nlm/ncbi/seqr/tokenizer/TokenSizeFilter.java

@@ -0,0 +1,69 @@
+/*
+ * 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 gov.nih.nlm.ncbi.seqr.tokenizer;
+
+import org.apache.lucene.analysis.TokenFilter;
+import org.apache.lucene.analysis.TokenStream;
+import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
+
+import java.io.IOException;
+
+/**
+ * A TokenSizeFilter that caculate the number of tokens in the token stream and save it to the first token
+ */
+public final class TokenSizeFilter extends TokenFilter {
+
+    private final CharTermAttribute termAttribute = addAttribute(CharTermAttribute.class);
+    private int counter = 0;
+
+    /**
+     * Creates a new TokenSizeFilter
+     *
+     * @param in TokenStream that will be filtered
+     */
+    public TokenSizeFilter(TokenStream in) {
+        super(in);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public boolean incrementToken() throws IOException {
+
+        if (counter <= 0) {
+            while (input.incrementToken()) {
+                counter++;
+            }
+            termAttribute.setEmpty();
+            termAttribute.append(Integer.toString(counter));
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void reset() throws IOException {
+        super.reset();
+        counter = 0;
+
+    }
+}