Examples with JsonFlattener com.github.wnameless.json.flattener.JsonFlattener used on opensource projects

Example 1 with JsonFlattener

use of com.github.wnameless.json.flattener.JsonFlattener in project nifi by apache.

the class FlattenJson method onTrigger.

@Override
public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException {
    FlowFile flowFile = session.get();
    if (flowFile == null) {
        return;
    }
    final String mode = context.getProperty(FLATTEN_MODE).getValue();
    final FlattenMode flattenMode = getFlattenMode(mode);
    String separator = context.getProperty(SEPARATOR).evaluateAttributeExpressions(flowFile).getValue();
    try {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        session.exportTo(flowFile, bos);
        bos.close();
        String raw = new String(bos.toByteArray());
        final String flattened = new JsonFlattener(raw).withFlattenMode(flattenMode).withSeparator(separator.charAt(0)).withStringEscapePolicy(() -> StringEscapeUtils.ESCAPE_JAVA).flatten();
        flowFile = session.write(flowFile, os -> os.write(flattened.getBytes()));
        session.transfer(flowFile, REL_SUCCESS);
    } catch (Exception ex) {
        session.transfer(flowFile, REL_FAILURE);
    }
}