org.springframework.batch.item.file.mapping.JsonLineMapper Maven / Gradle / Ivy
/*
* Copyright 2009-2014 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 org.springframework.batch.item.file.mapping;
import java.util.Map;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.MappingJsonFactory;
import org.springframework.batch.item.file.LineMapper;
/**
* Interpret a line as a JSON object and parse it up to a Map. The line should be a standard JSON object, starting with
* "{" and ending with "}" and composed of name:value pairs separated by commas. Whitespace is ignored,
* e.g.
*
*
* { "foo" : "bar", "value" : 123 }
*
*
* The values can also be JSON objects (which are converted to maps):
*
*
* { "foo": "bar", "map": { "one": 1, "two": 2}}
*
*
* @author Dave Syer
*
*/
public class JsonLineMapper implements LineMapper> {
private MappingJsonFactory factory = new MappingJsonFactory();
/**
* Interpret the line as a Json object and create a Map from it.
*
* @see LineMapper#mapLine(String, int)
*/
@Override
public Map mapLine(String line, int lineNumber) throws Exception {
Map result;
JsonParser parser = factory.createParser(line);
@SuppressWarnings("unchecked")
Map token = parser.readValueAs(Map.class);
result = token;
return result;
}
}