content: /*
   * Copyright [2021-present] [ahoo wang <ahoowang@qq.com> (https://github.com/Ahoo-Wang)].
   * 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 me.ahoo.cosid.converter;
  
  import me.ahoo.cosid.Decorator;
  import me.ahoo.cosid.IdConverter;
  import me.ahoo.cosid.stat.Stat;
  import me.ahoo.cosid.stat.converter.PrefixConverterStat;
  
  import jakarta.annotation.Nonnull;
  import com.google.common.base.Preconditions;
  
  
  /**
   * Converter for setting string ID prefix.
   *
   * @author ahoo wang
   */
  public class PrefixIdConverter implements IdConverter, Decorator<IdConverter> {
      
      private final String prefix;
      private final IdConverter actual;
      
      public PrefixIdConverter(String prefix, IdConverter actual) {
          Preconditions.checkNotNull(prefix, "prefix can not be null!");
          this.prefix = prefix;
          this.actual = actual;
      }
      
      @Nonnull
      @Override
      public IdConverter getActual() {
          return actual;
      }
      
      public String getPrefix() {
          return prefix;
      }
      
      @Nonnull
      @Override
      public String asString(long id) {
          String idStr = actual.asString(id);
          if (prefix.isEmpty()) {
              return idStr;
          }
          return prefix + idStr;
      }
      
      @Override
      public long asLong(@Nonnull String idString) {
          String idStr = idString.substring(prefix.length());
          return actual.asLong(idStr);
      }
      
      @Override
      public Stat stat() {
          return new PrefixConverterStat(getClass().getSimpleName(), prefix, actual.stat());
      }
  }
  