Github user ottobackwards commented on a diff in the pull request:
https://github.com/apache/metron/pull/667#discussion_r131143225
--- Diff:
metron-stellar/stellar-common/src/main/java/org/apache/metron/stellar/dsl/functions/TextFunctions.java
---
@@ -0,0 +1,63 @@
+/**
+ * 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.metron.stellar.dsl.functions;
+
+import java.util.List;
+import java.util.Locale;
+import org.apache.commons.lang.StringUtils;
+import org.apache.commons.text.similarity.FuzzyScore;
+import org.apache.metron.stellar.dsl.BaseStellarFunction;
+import org.apache.metron.stellar.dsl.Stellar;
+
+public class TextFunctions {
+
+ @Stellar(name = "FUZZY_SCORE",
+ description =
+ "Returns the Fuzzy Score which indicates the similarity score
between two Strings "
+ +
+ "One point is given for every matched character. Subsequent
matches yield two bonus "
+ +
+ "points. A higher score indicates a higher similarity",
+ params = {
+ "string - The full term that should be matched against",
+ "string - The query that will be matched against a term",
+ "string - The IETF BCP 47 language code to use"
+ },
+ returns = "integer representing the score")
+ /**
+ * FuzzyScoreFunction exposes the Apache Commons Text Similarity
FuzzyScore through
+ * Stellar.
+ */
+ public static class FuzzyScoreFunction extends BaseStellarFunction {
+
+ @Override
+ public Object apply(List<Object> list) {
+ if (list.size() < 3) {
+ throw new IllegalStateException("FUZZY_SCORE expects three args:
[string, string, string]");
+ }
+ String term = (String) list.get(0);
--- End diff --
We really need a pattern or a helper class for stellar for variables, that
everyone uses.
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