content: /*
   * Copyright 2013-2023 the original author or authors.
   *
   * 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
   *
   *      https://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 com.alibaba.cloud.nacos.parser;
  
  import java.io.IOException;
  import java.util.Collections;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  
  import com.fasterxml.jackson.core.JsonParser;
  import com.fasterxml.jackson.databind.ObjectMapper;
  
  import org.springframework.boot.env.OriginTrackedMapPropertySource;
  import org.springframework.core.env.PropertySource;
  import org.springframework.core.io.Resource;
  
  /**
   * @author zkz
   */
  public class NacosJsonPropertySourceLoader extends AbstractPropertySourceLoader {
  
  	/**
  	 * constant.
  	 */
  	private static final String VALUE = "value";
  
  	/**
  	 * Returns the file extensions that the loader supports (excluding the '.').
  	 * @return the file extensions
  	 */
  	@Override
  	public String[] getFileExtensions() {
  		return new String[] { "json" };
  	}
  
  	/**
  	 * Load the resource into one or more property sources. Implementations may either
  	 * return a list containing a single source, or in the case of a multi-document format
  	 * such as yaml a source for each document in the resource.
  	 * @param name the root name of the property source. If multiple documents are loaded
  	 * an additional suffix should be added to the name for each source loaded.
  	 * @param resource the resource to load
  	 * @return a list property sources
  	 * @throws IOException if the source cannot be loaded
  	 */
  	@Override
  	protected List<PropertySource<?>> doLoad(String name, Resource resource)
  			throws IOException {
  		Map<String, Object> result = new LinkedHashMap<>(32);
  		ObjectMapper mapper = new ObjectMapper();
  		// [fix issue #3043] support comment in json config
  		mapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
  		Map<String, Object> nacosDataMap = mapper.readValue(resource.getInputStream(),
  				LinkedHashMap.class);
  		flattenedMap(result, nacosDataMap, null);
  		return Collections.singletonList(
  				new OriginTrackedMapPropertySource(name, this.reloadMap(result), true));
  
  	}
  
  	/**
  	 * Reload the key ending in `value` if need.
  	 */
  	protected Map<String, Object> reloadMap(Map<String, Object> map) {
  		if (map == null || map.isEmpty()) {
  			return null;
  		}
  		Map<String, Object> result = new LinkedHashMap<>(map);
  		for (Map.Entry<String, Object> entry : map.entrySet()) {
  			String key = entry.getKey();
  			if (key.contains(AbstractPropertySourceLoader.DOT)) {
  				int idx = key.lastIndexOf(AbstractPropertySourceLoader.DOT);
  				String suffix = key.substring(idx + 1);
  				if (VALUE.equalsIgnoreCase(suffix)) {
  					result.put(key.substring(0, idx), entry.getValue());
  				}
  			}
  		}
  		return result;
  	}
  
  }
  