/**
* 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.hadoop.gateway.util;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import org.apache.hadoop.gateway.i18n.GatewayUtilCommonMessages;
import org.apache.hadoop.gateway.i18n.messages.MessagesFactory;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JsonUtils {
private static final GatewayUtilCommonMessages LOG = MessagesFactory.get( GatewayUtilCommonMessages.class );
public static String renderAsJsonString(Map<String, Object> map) {
String json = null;
ObjectMapper mapper = new ObjectMapper();
try {
// write JSON to a file
json = mapper.writeValueAsString((Object)map);
} catch ( JsonProcessingException e ) {
LOG.failedToSerializeMapToJSON( map, e );
}
return json;
}
public static Map<String, String> getMapFromJsonString(String json) {
Map<String, String> map = null;
JsonFactory factory = new JsonFactory();
ObjectMapper mapper = new ObjectMapper(factory);
TypeReference<HashMap<String,String>> typeRef
= new TypeReference<HashMap<String,String>>() {};
try {
map = mapper.readValue(json, typeRef);
} catch (JsonParseException e) {
LOG.failedToGetMapFromJsonString( json, e );
} catch (JsonMappingException e) {
LOG.failedToGetMapFromJsonString( json, e );
} catch (IOException e) {
LOG.failedToGetMapFromJsonString( json, e );
}
return map;
}
}