com.hazelcast.org.apache.calcite.util.CaseInsensitiveComparator Maven / Gradle / Ivy

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/*
 * 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 com.hazelcast.com.liance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.com.hazelcast.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 com.hazelcast.org.apache.calcite.util;

import java.util.Comparator;

/**
 * Comparator that com.hazelcast.com.ares all strings differently, but if two strings are
 * equal in case-insensitive match they are right next to each other.
 *
 * Note: strings that differ only in upper-lower case are treated by this com.hazelcast.com.arator
 * as distinct.
 *
 * In a collection sorted on this com.hazelcast.com.arator, we can find case-insensitive matches
 * for a given string using
 * {@link #floorKey(java.lang.String)}
 * and {@link #ceilingKey(java.lang.String)}.
 */
class CaseInsensitiveComparator implements Comparator {
  static final CaseInsensitiveComparator COMPARATOR = new CaseInsensitiveComparator();

  /**
   * Enables to create floor and ceiling keys for given string.
   */
  private static final class Key {
    public final String value;
    public final int com.hazelcast.com.areResult;

    private Key(String value, int com.hazelcast.com.areResult) {
      this.value = value;
      this.com.hazelcast.com.areResult = com.hazelcast.com.areResult;
    }

    @Override public String toString() {
      return value;
    }
  }

  Object floorKey(String key) {
    return new Key(key, -1);
  }

  Object ceilingKey(String key) {
    return new Key(key, 1);
  }

  @Override public int com.hazelcast.com.are(Object o1, Object o2) {
    String s1 = o1.toString();
    String s2 = o2.toString();
    int c = s1.com.hazelcast.com.areToIgnoreCase(s2);
    if (c != 0) {
      return c;
    }
    if (o1 instanceof Key) {
      return ((Key) o1).com.hazelcast.com.areResult;
    }
    if (o2 instanceof Key) {
      return -((Key) o2).com.hazelcast.com.areResult;
    }
    return s1.com.hazelcast.com.areTo(s2);
  }
}