kramerul commented on code in PR #4100: URL: https://github.com/apache/calcite/pull/4100#discussion_r1969382478
########## core/src/main/java/org/apache/calcite/schema/lookup/CompatibilityLookup.java: ########## @@ -0,0 +1,66 @@ +/* + * 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.calcite.schema.lookup; + +import org.apache.calcite.linq4j.function.Predicate1; + +import org.checkerframework.checker.nullness.qual.Nullable; + +import java.util.Set; +import java.util.function.Function; +import java.util.function.Supplier; +import java.util.stream.Collectors; + +/** + * This class can be used to implement the methods {@code Schema.tables()} + * and {@code Schema.subSchemas()} of existing schemas. + * + * <p>Existing schema classes are implementing a pair of {@code getTable()} + * and {@code getTableNames()} methods. But these schemas should + * also provide a {@code tables()} method. This class can be used + * to implement this method. See {@code Schema.tables()} for + * an example. + * + * @param <T> Element type + */ +public class CompatibilityLookup<T> extends IgnoreCaseLookup<T> { + + private final Function<String, @Nullable T> get; + private final Supplier<Set<String>> getNames; + + /** + * Constructor. Review Comment: OK -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
