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Core Calcite APIs and engine.
There is a newer version: 1.17.0-flink-r3
/*
 * 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.util;

import org.apache.calcite.linq4j.function.Experimental;

import com.google.common.collect.ImmutableSortedMap;

import java.util.Locale;
import java.util.Map;
import java.util.NavigableMap;
import java.util.TreeMap;

import static org.apache.calcite.util.NameSet.COMPARATOR;

/** Map whose keys are names and can be accessed with and without case
 * sensitivity.
 *
 * @param  Value type */
public class NameMap {
  private final NavigableMap map;

  /** Creates a NameSet based on an existing set. */
  private NameMap(NavigableMap map) {
    this.map = map;
    assert this.map.comparator() == COMPARATOR;
  }

  /** Creates a NameMap, initially empty. */
  public NameMap() {
    this(new TreeMap(COMPARATOR));
  }

  /** Creates a NameMap that is an immutable copy of a given map. */
  public static  NameMap immutableCopyOf(Map names) {
    return new NameMap<>(ImmutableSortedMap.copyOf(names, COMPARATOR));
  }

  public void put(String name, V v) {
    map.put(name, v);
  }

  /** Returns a map containing all the entries in the map that match the given
   * name. If case-sensitive, that map will have 0 or 1 elements; if
   * case-insensitive, it may have 0 or more. */
  public NavigableMap range(String name, boolean caseSensitive) {
    if (caseSensitive) {
      if (map.containsKey(name)) {
        return ImmutableSortedMap.of(name, map.get(name));
      } else {
        return ImmutableSortedMap.of();
      }
    } else {
      return map.subMap(name.toUpperCase(Locale.ROOT), true,
          name.toLowerCase(Locale.ROOT), true);
    }
  }

  /** Returns whether this map contains a given key, with a given
   * case-sensitivity. */
  public boolean containsKey(String name, boolean caseSensitive) {
    return !range(name, caseSensitive).isEmpty();
  }

  /** Returns the underlying map. */
  public NavigableMap map() {
    return map;
  }

  @Experimental
  public V remove(String key) {
    return map.remove(key);
  }
}

// End NameMap.java