content: package act.util;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import org.osgl.util.*;
  
  import java.lang.annotation.*;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Specify header mapping when loading a list of data
   * into a field with {@link act.inject.util.LoadResource}.
   *
   * Note if the target field type is not a List of data, this
   * annotation will be ignored.
   */
  @Retention(RetentionPolicy.RUNTIME)
  @Target(ElementType.FIELD)
  public @interface HeaderMapping {
  
      /**
       * Specify header mapping.
       *
       * Example: `"# as id,姓 as lastName,名 as firstName"`
       */
      String value();
  
      class Parser {
          public static Map<String, String> parse(String value) {
              if (S.isBlank(value)) {
                  return C.Map();
              }
              S.List list = S.fastSplit(value, ",");
              Map<String, String> map = new HashMap<>();
              for (String part : list) {
                  part = part.trim();
                  int pos = part.toLowerCase().indexOf(" as ");
                  E.illegalArgumentIf(pos < 1, "Illegal mapping specification: " + part);
                  String src = part.substring(0, pos);
                  String tgt = part.substring(pos + 4);
                  map.put(src, tgt);
              }
              return map;
          }
      }
  
  }
  