/*
    * Copyright 2012-2025 CodeLibs Project and the Others.
    *
    * 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 org.codelibs.fess.script;
  
  import java.util.LinkedHashMap;
  import java.util.Locale;
  import java.util.Map;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.codelibs.fess.exception.ScriptEngineException;
  
  /**
   * This class is a factory for script engines.
   */
  public class ScriptEngineFactory {
      /**
       * Constructor.
       */
      public ScriptEngineFactory() {
          super();
      }
  
      private static final Logger logger = LogManager.getLogger(ScriptEngineFactory.class);
  
      /**
       * A map of script engines.
       */
      protected Map<String, ScriptEngine> scriptEngineMap = new LinkedHashMap<>();
  
      /**
       * Adds a script engine.
       * @param name The name of the script engine.
       * @param scriptEngine The script engine.
       */
      public void add(final String name, final ScriptEngine scriptEngine) {
          if (name == null || scriptEngine == null) {
              throw new IllegalArgumentException(
                      "Both name and scriptEngine parameters are required. name: " + name + ", scriptEngine: " + scriptEngine);
          }
          if (logger.isDebugEnabled()) {
              logger.debug("Loaded ScriptEngine: {}", name);
          }
          scriptEngineMap.put(name.toLowerCase(Locale.ROOT), scriptEngine);
          scriptEngineMap.put(scriptEngine.getClass().getSimpleName().toLowerCase(Locale.ROOT), scriptEngine);
      }
  
      /**
       * Gets a script engine.
       * @param name The name of the script engine.
       * @return The script engine.
       */
      public ScriptEngine getScriptEngine(final String name) {
          if (name == null) {
              throw new ScriptEngineException("Script engine name parameter is null. A valid script engine name must be provided.");
          }
          final ScriptEngine scriptEngine = scriptEngineMap.get(name.toLowerCase(Locale.ROOT));
          if (scriptEngine != null) {
              return scriptEngine;
          }
          throw new ScriptEngineException(name + " is not found.");
      }
  }