/*
    * 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.syncope.core.keymaster.internal;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.json.JsonMapper;
  import java.io.IOException;
  import java.util.Map;
  import org.apache.syncope.common.keymaster.client.api.ConfParamOps;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.transaction.annotation.Transactional;
  
  public class SelfKeymasterInternalConfParamOps implements ConfParamOps {
  
      protected static final Logger LOG = LoggerFactory.getLogger(ConfParamOps.class);
  
      protected static final JsonMapper MAPPER = JsonMapper.builder().findAndAddModules().build();
  
      protected final InternalConfParamHelper helper;
  
      public SelfKeymasterInternalConfParamOps(final InternalConfParamHelper helper) {
          this.helper = helper;
      }
  
      @Transactional(readOnly = true)
      @Override
      public Map<String, Object> list(final String domain) {
          return helper.list();
      }
  
      @Transactional(readOnly = true)
      @Override
      public <T> T get(final String domain, final String key, final T defaultValue, final Class<T> reference) {
          JsonNode valueNode = helper.get(key);
          if (valueNode == null) {
              return defaultValue;
          }
  
          try {
              return MAPPER.treeToValue(valueNode, reference);
          } catch (IOException e) {
              LOG.error("Could not deserialize {}", valueNode, e);
              return defaultValue;
          }
      }
  
      @Transactional
      @Override
      public <T> void set(final String domain, final String key, final T value) {
          if (value == null) {
              remove(domain, key);
          } else {
              helper.set(key, MAPPER.valueToTree(value));
          }
      }
  
      @Transactional
      @Override
      public void remove(final String domain, final String key) {
          helper.remove(key);
      }
  }