Github user rmetzger commented on a diff in the pull request: https://github.com/apache/flink/pull/1097#discussion_r45173067 --- Diff: flink-java/src/main/java/org/apache/flink/api/java/utils/RequiredParameters.java --- @@ -0,0 +1,156 @@ +/* + * 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.flink.api.java.utils; + +import java.util.HashMap; +import java.util.Map; +import java.util.Objects; + +/** + * Facility to manage required parameters in user defined functions. + */ +public class RequiredParameters { + + private static final String HELP_TEXT_PARAM_DELIMITER = "\t"; + private static final String HELP_TEXT_LINE_DELIMITER = "\n"; + + private HashMap<String, Option> data; + + public RequiredParameters() { + this.data = new HashMap<>(); + } + + public Option add(String name) throws RequiredParametersException { --- End diff -- I think the two add methods are missing javadocs.
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