001/* 002 * Copyright 2009-2014 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016package org.springframework.batch.item.file.mapping; 017 018import java.util.Map; 019 020import com.fasterxml.jackson.core.JsonParser; 021import com.fasterxml.jackson.databind.MappingJsonFactory; 022 023import org.springframework.batch.item.file.LineMapper; 024 025/** 026 * Interpret a line as a JSON object and parse it up to a Map. The line should be a standard JSON object, starting with 027 * "{" and ending with "}" and composed of <code>name:value</code> pairs separated by commas. Whitespace is ignored, 028 * e.g. 029 * 030 * <pre> 031 * { "foo" : "bar", "value" : 123 } 032 * </pre> 033 * 034 * The values can also be JSON objects (which are converted to maps): 035 * 036 * <pre> 037 * { "foo": "bar", "map": { "one": 1, "two": 2}} 038 * </pre> 039 * 040 * @author Dave Syer 041 * 042 */ 043public class JsonLineMapper implements LineMapper<Map<String, Object>> { 044 045 private MappingJsonFactory factory = new MappingJsonFactory(); 046 047 /** 048 * Interpret the line as a Json object and create a Map from it. 049 * 050 * @see LineMapper#mapLine(String, int) 051 */ 052 @Override 053 public Map<String, Object> mapLine(String line, int lineNumber) throws Exception { 054 Map<String, Object> result; 055 JsonParser parser = factory.createParser(line); 056 @SuppressWarnings("unchecked") 057 Map<String, Object> token = parser.readValueAs(Map.class); 058 result = token; 059 return result; 060 } 061 062}