Using DataSonnet Programmatically

DataSonnet is distributed as a JAR which contains all necessary classes and dependencies to use DataSonnet programmatically embedded in your projects. Use the following Maven snippet to add DataSonnet as a dependency to your pom.xml:

<dependency>
    <groupId>com.datasonnet</groupId>
    <artifactId>datasonnet-mapper</artifactId>
    <version>${datasonnet.version}</version>
</dependency>

where ${datasonnet.version} is the latest released version.

The simplest scenario is mapping from JSON to JSON with no additional variables:

String json = ...; //JSON object as string

Mapper mapper = new Mapper(datasonnetScript);
String transformedJson = mapper.transform(json)

More complex scenarios may involve passing additional variables as well as transforming to/from other supported data formats:

String jsonData = ...;

String jsonVar = ...;
String xmlVar = ...;
String textVar = ...;

Map<String, Document> variables = new HashMap<>();
variables.put("varJson", new StringDocument(jsonVar, "application/json"));
variables.put("varXml", new StringDocument(xmlVar, "application/xml"));
variables.put("varTxt", new StringDocument(textVar, "text/plain"));

Mapper mapper = new Mapper(datasonnetScript, variables.keySet());
Document transformedResult = mapper.transform(new StringDocument(jsonData, "application/json"), variables, "application/json");
String jsonResult = transformedResult.getContentsAsString();

The Mapper constructor accepts the following arguments:

  • datasonnetScript - the String which contains the mapping code;

  • argumentNames - the java.util.Set which contains the names of the additional variables

The transform method accepts the following arguments:

  • payload - the instance of the com.datasonnet.Document which contains the data and the mime type;

  • variables - the instance of the Map<String, com.datasonnet.Document> which contains the additional variables.

The result of the transform method invocation is the instance of the com.datasonnet.Document object which contains the result of the mapping and its mime type.

There are overloaded transform methods which accept different sets of parameters; see the DataSonnet source code and documentation for details.