| 1 | package org.springframework.batch.item.file.mapping; |
| 2 | |
| 3 | import java.util.Map; |
| 4 | |
| 5 | import org.codehaus.jackson.JsonParser; |
| 6 | import org.codehaus.jackson.map.MappingJsonFactory; |
| 7 | import org.springframework.batch.item.file.LineMapper; |
| 8 | |
| 9 | /** |
| 10 | * Interpret a line as a Json object and parse it up to a Map. The line should be a standard Json object, starting with |
| 11 | * "{" and ending with "}" and composed of <code>name:value</code> pairs separated by commas. Whitespace is ignored, |
| 12 | * e.g. |
| 13 | * |
| 14 | * <pre> |
| 15 | * { "foo" : "bar", "value" : 123 } |
| 16 | * </pre> |
| 17 | * |
| 18 | * The values can also be Json objects (which are converted to maps): |
| 19 | * |
| 20 | * <pre> |
| 21 | * { "foo": "bar", "map": { "one": 1, "two": 2}} |
| 22 | * </pre> |
| 23 | * |
| 24 | * @author Dave Syer |
| 25 | * |
| 26 | */ |
| 27 | public class JsonLineMapper implements LineMapper<Map<String, Object>> { |
| 28 | |
| 29 | private MappingJsonFactory factory = new MappingJsonFactory(); |
| 30 | |
| 31 | /** |
| 32 | * Interpret the line as a Json object and create a Map from it. |
| 33 | * |
| 34 | * @see LineMapper#mapLine(String, int) |
| 35 | */ |
| 36 | public Map<String, Object> mapLine(String line, int lineNumber) throws Exception { |
| 37 | Map<String, Object> result; |
| 38 | JsonParser parser = factory.createJsonParser(line); |
| 39 | @SuppressWarnings("unchecked") |
| 40 | Map<String, Object> token = parser.readValueAs(Map.class); |
| 41 | result = token; |
| 42 | return result; |
| 43 | } |
| 44 | |
| 45 | } |