Github user ottobackwards commented on a diff in the pull request:
https://github.com/apache/metron/pull/667#discussion_r134747025
--- 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 --
The thinking is that the user is going to write an expression where they
want the score between two things. In an error conditions, logically the score
would be 0, and they can still have the correct logical outcome. It is just
more forgiving.
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