Github user ottobackwards commented on a diff in the pull request: https://github.com/apache/metron/pull/667#discussion_r135246886 --- 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 -- @nickwallen Check out my latest. Note that because of the way validate works, we need to return 0 for non-string arguments.
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