View Javadoc

1   /*
2    * Copyright 2006-2007 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.batch.item.file.separator;
18  
19  import org.springframework.util.StringUtils;
20  
21  /**
22   * JSON-based record separator. Waits for a valid JSON object before returning a
23   * complete line. A valid object has balanced braces ({}), possibly nested, and
24   * ends with a closing brace. This separator can be used to split a stream into
25   * JSON objects, even if those objects are spread over multiple lines, e.g.
26   * 
27   * <pre>
28   * {"foo": "bar",
29   *  "value": { "spam": 2 }}
30   *  {"foo": "rab",
31   *  "value": { "spam": 3, "foo": "bar" }}
32   * </pre>
33   * 
34   * @author Dave Syer
35   * 
36   */
37  public class JsonRecordSeparatorPolicy extends SimpleRecordSeparatorPolicy {
38  
39  	/**
40  	 * True if the line can be parsed to a JSON object.
41  	 * 
42  	 * @see RecordSeparatorPolicy#isEndOfRecord(String)
43  	 */
44      @Override
45  	public boolean isEndOfRecord(String line) {
46  		return StringUtils.countOccurrencesOf(line, "{") == StringUtils.countOccurrencesOf(line, "}")
47  				&& line.trim().endsWith("}");
48  	}
49  
50  }