content: /*
   *  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 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.apache.asterix.common.library;
  
  import org.apache.asterix.common.functions.ExternalFunctionLanguage;
  import org.apache.hyracks.api.io.IJsonSerializable;
  import org.apache.hyracks.api.io.IPersistedResourceRegistry;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.node.ObjectNode;
  
  /**
   * The information needed to libraries at startup
   */
  public class LibraryDescriptor implements IJsonSerializable {
  
      private static final long serialVersionUID = 3L;
  
      private static final String FIELD_LANGUAGE = "lang";
      public static final String FIELD_HASH = "hash_md5";
  
      /**
       * The library's language
       */
      private final ExternalFunctionLanguage lang;
  
      private final String hash;
  
      public LibraryDescriptor(ExternalFunctionLanguage language, String hash) {
          this.lang = language;
          this.hash = hash;
      }
  
      public ExternalFunctionLanguage getLanguage() {
          return lang;
      }
  
      public String getHash() {
          return hash;
      }
  
      public JsonNode toJson(IPersistedResourceRegistry registry) {
          ObjectNode jsonNode = registry.getClassIdentifier(LibraryDescriptor.class, serialVersionUID);
          jsonNode.put(FIELD_LANGUAGE, lang.name());
          jsonNode.put(FIELD_HASH, hash);
          return jsonNode;
      }
  
      public static IJsonSerializable fromJson(IPersistedResourceRegistry registry, JsonNode json) {
          String langText = json.get(FIELD_LANGUAGE).asText();
          ExternalFunctionLanguage lang = ExternalFunctionLanguage.valueOf(langText);
          String hash = json.get(FIELD_HASH).asText();
          return new LibraryDescriptor(lang, hash);
      }
  }
  