/*
 * Copyright DataStax, Inc.
 *
 * Licensed 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 com.datastax.oss.driver.internal.mapper.processor.util;

import java.util.HashMap;
import java.util.Map;

/** Ensures the unicity of the members of a generated class. */
public class NameIndex {

  private Map<String, Integer> fieldIndices = new HashMap<>();

  /**
   * Generates a field or constant name that is unique across this index: if the given name is free,
   * it's used as-is, otherwise an incrementing index is appended to it.
   */
  public String uniqueField(String baseName) {
    Integer index = fieldIndices.compute(baseName, (k, v) -> (v == null) ? 0 : v + 1);
    return (index == 0) ? baseName : baseName + index;
  }
}
