content: /*
   * 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.HashMap;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  /**
   * Simple utility class to test other implementations of Lookup.
   */
  class FakeLookup implements Lookup<String> {
    private final Map<String, String> map;
    private final Map<String, Named<String>> ignoreCaseMap;
  
    FakeLookup(String... keyAndValues) {
      this.map = new HashMap<>();
      for (int i = 0; i < keyAndValues.length - 1; i += 2) {
        map.put(keyAndValues[i], keyAndValues[i + 1]);
      }
      this.ignoreCaseMap = this.map.entrySet().stream()
          .collect(
              Collectors.toMap(
                  entry -> entry.getKey().toLowerCase(Locale.ROOT),
                  entry -> new Named<>(entry.getKey(), entry.getValue())));
    }
  
    @Override public @Nullable String get(final String name) {
      return map.get(name);
    }
  
    @Override public @Nullable Named<String> getIgnoreCase(final String name) {
      return ignoreCaseMap.get(name.toLowerCase(Locale.ROOT));
    }
  
    @Override public Set<String> getNames(final LikePattern pattern) {
      Predicate1<String> predicate = pattern.matcher();
      return map.keySet().stream().filter(predicate::apply).collect(Collectors.toSet());
    }
  }
  